TERMINAL DEVICE, POWER ADJUSTMENT METHOD, COMMUNICATION DEVICE, RECEPTION METHOD, AND INTEGRATED CIR

专利摘要:
terminal apparatus, power-power adjustment method, communication apparatus, receiving method, and integrated circuit for controlling a process The invention relates to methods for adjusting the transmit power used by a mobile terminal for uplink transmissions, and to methods to adjust the transmit power used by a mobile terminal for one or more splitting procedures. the invention is also providing apparatus and system for carrying out these methods, and computer readable means, the instructions of which cause the apparatus and system to perform the methods described herein. to allow for tuning the transmission power of uplink transmissions on uplink component carriers, the invention suggests introducing a power scaling for uplink prach transmissions by performing splitting procedures on an uplink component carrier. power scaling is proposed based on a prioritization among multiple uplink transmissions or based on the uplink component carriers on which splitting procedures are performed.
公开号:BR112012024838B1
申请号:R112012024838-3
申请日:2011-04-01
公开日:2022-02-01
发明作者:Martin Feuersänger；Joachim Löhr；Takahisa Aoyama
申请人:Sun Patent Trust；
IPC主号:

专利说明:

FIELD OF THE INVENTION
The invention relates to methods for controlling power in uplink situations where an uplink transmission and a random access preamble, or multiple random access preambles, are transmitted in the same transmission interval. Furthermore, the invention also relates to the implementation/performance of these methods in/by hardware, i.e. devices, and their implementations in software. TECHNICAL HISTORY LONG TERM EVOLUTION (LTE)
Third generation (3G) mobile systems based on WCDMA radio access technology are being developed on a large scale around the world. A first step in improving or evolving this technology involves the introduction of High-Speed Downlink Packet Access (HSDPA) and an improved uplink, also called High-Speed Uplink Packet Access ( HSUPA – “High Speed Uplink Packet Access”), providing a radio access technology that is highly competitive.
To be prepared to further increase user demands and be competitive against new radio access technologies, 3GPP has introduced a new mobile communication system which is called Long Term Evolution (LTE). LTE is designed to meet carrier needs for high-speed data transport and media as well as high-capacity voice support for the next decade. The ability to provide high bit rates is a key measure for LTE.
The work item (WI) specification in Long Term Evolution (LTE) called Evolved UMTS Terrestrial Radio Access (UTRA) and UMTS Terrestrial Radio Access Network (UTRAN) is to be finalized as Version 8 (LTE Ver. 8). The LTE system represents efficient packet-based radio access and radio access networks that provide completely IP-based functionality with low latency and low cost. Detailed system requirements are given. In LTE, scalable multi-transmission bandwidths are specified, such as 1.4, 3.0, 5.0, 10.0, 15.0, and 20.0 MHz, to achieve flexible system deployment using a given spectrum. On the downlink, radio access based on Orthogonal Frequency Division Multiplexing (OFDM) was adopted because of its inherent immunity to multipath interference (MPI) due to a low symbol rate, the use of a cyclic prefix ( CP - “cyclic prefix”), and its affinity with different transmission bandwidths. Radio access based on single-carrier frequency division multiple access (SC-FDMA) was adopted in the uplink, since providing a wide coverage area was prioritized over the uplink. improvement in peak data rate, considering the restricted power margin of user equipment (UE - “User Equipment”). Many key packet radio access techniques are employed, including multiple-input multiple-output (MIMO) channel transmission techniques, and a highly efficient control signaling structure is achieved in LTE Ver. 8. LTE ARCHITECTURE
The general architecture is shown in Figure 1, and a more detailed representation of the E-UTRAN architecture is given in Figure 2. The E-UTRAN consists of eNodeB, providing the E-UTRA user plane protocol terminations (PDCP/RLC/ MAC/PHY) and control plane (RRC) towards the user equipment (UE). The eNodeB (eNB) hosts the Physical (PHY - "Physical"), Medium Access Control (MAC - "Medium Access Control"), Radio Link Control (RLC), and Packet Control Protocol layers. (PDCD - “Packet Data Control Protocol”) that include user plane header encryption compression functionality. It also provides Radio Resource Control (RRC) functionality corresponding to the control plane. It performs various functions including radio resource management, admission control, scheduling, negotiated uplink QoS compliance, cell information transmission, encrypt/decrypt user plane packet headers. The eNodeBs are interconnected with each other through the X2 interface.
The eNodeBs are also connected through an S1 interface to the EPC (Evolved Packet Core), more specifically to the MME (Mobility Management Entity) through the S1-MMe and the service portal (SGW - “Serving Gateway”) through the S1-U. The S1 interface supports a many-to-many relationship between MMEs/Service Portals and eNodeBs. The SGW routes and forwards user data packets, while also acting as the mobility anchor for the user plane during handoffs between eNodeBs and as the mobility anchor between LTE and other 3GPP technologies (terminating the S4 interface and relaying traffic between 2G/3G systems and PDN GW) . For idle state user equipment, the SGW terminates the downlink data path and triggers paging when downlink data arrives for the user equipment. It manages and stores user equipment contexts, eg IP bearer service parameters, network internal routing information. It also performs the reapplication of user traffic in case of lawful interception.
The MME is the key control node for the LTE access network. She is responsible for the procedure for tracking and paging user equipment in idle mode, including retransmissions. It is involved in the bearer activation/deactivation process and is also responsible for choosing the SGW for a user equipment at the initial link and at the time of intra-LTE delivery, involving Core Network (CN) node relocation. ). It is responsible for authenticating the user (interacting with the HSS). The Non-Access Stratum (NAS - “Non-Access Stratum”) signaling ends at the MME and is also responsible for generating and allocating temporary identities to user equipment. It checks the authorization of the user equipment to camp on the Public Land Mobile Network (PLMN - “Public Land Mobile Network”) and enforces roaming restrictions on the user equipment. The MME is the endpoint on the network to encrypt/integrity protect for NAS signaling and controls security key management. Legal intercepts of beacons are also supported by the MME. The MME also provides the control plane function for mobility between LTE and 2G/3G access networks with the S3 interface terminating at the MME from the SGSN. MME also terminates the S6a interface towards the home HSS to roam user equipment. UPLINK ACCESS SCHEME FOR LTE
For uplink transmission, a power efficient user terminal transmission is required to maximize coverage. Single carrier transmission combined with FDMA (Frequency Division Multiple Access) with dynamic bandwidth allocation was chosen as the evolved UTRA uplink transmission scheme. The main reason for the preference for single-carrier transmission is the low peak-to-average power ratio (PAPR) compared to Orthogonal Frequency Division Multiple (OFDMA) signals. Access), and the corresponding improved power amplification efficiency and assumed best coverage (higher data rates for a given peak terminal power). During each time slot, eNodeB assigns users a unique time/frequency resource to transmit user data, thus ensuring intracellular orthogonality. Orthogonal access on the uplink promises improved spectral efficiency by eliminating intracellular interference. Interference due to multipath propagation is controlled at the base station (eNodeB), aided by the insertion of a cyclic prefix in the transmitted signal.
The basic physical resource used for data transmission consists of a frequency resource of size BWgrant over a time interval, for example a 0.5 ms subframe, over which bits of information are mapped. It should be noted that a sub-frame, also called transmission time interval (TTI - “transmission time interval”), is the smallest time interval for transmitting user data. It is, however, possible to assign a BWgrant frequency resource over a longer period of time than a TTI to a user by sub-frame concatenation.
The frequency resource can be in either a localized or a distributed spectrum, as illustrated in Figure 3 and Figure 4. As can be seen in Figure 3, a single localized carrier is characterized by the transmitted signal having a continuous spectrum that occupies a part of the spectrum. full spectrum available. Different symbol rates (corresponding to different data rates) of the transmitted signal imply different bandwidths of a localized single-carrier signal.
On the other hand, as shown in Figure 4, the distributed single carrier is characterized by the transmitted signal having a discontinuous (“comb-shaped”) spectrum that is distributed across the bandwidth of the system. Note that although the distributed single-carrier signal is spread across the bandwidth of the system, the total amount of spectrum occupied is essentially the same as that of the localized single-carrier. Also, for a higher/lower symbol rate, the number of “comb fingers” is increased/decreased, while the “bandwidth” of each “comb finger” remains the same.
At first glance, the spectrum in Figure 4 may give the impression of a multi-carrier signal, where each finger of the comb corresponds to a "sub-carrier". However, from the time domain signal generation of a distributed single-carrier signal, it should be clear that what is being generated is a true single-carrier signal with a low peak-to-average power ratio. The key difference between a distributed single-carrier signal versus a multi-carrier signal, such as, for example, OFDM (Orthogonal Frequency Division Multiplex), is that, in the former case, each “sub-carrier” or “comb finger” does not carries a single modulation symbol. Instead, each “comb finger” carries information about all modulation symbols. This creates a dependency between the different comb fingers which leads to low PAPR characteristics. It is the same dependency between the “comb fingers” that leads to a need for equalization unless the channel is frequency non-selective across the entire transmission bandwidth. In contrast, for OFDM, equalization is not required as long as the channel is frequency non-selective across the sub-carrier bandwidth.
Distributed transmission can provide greater frequency diversity gain than localized transmission, while localized transmission more easily allows for channel-dependent scheduling. Note that, in many cases, the scheduling decision may decide to give all the bandwidth to a single user device to achieve high data rates. UPLINK SCHEDULE FOR LTE
The uplink scheme allows for both scheduled access, that is, controlled by eNodeB, and contention-based access.
In the case of scheduled access, user equipment is allocated a certain frequency resource for a certain time (ie, a time/frequency resource) for transmitting uplink data. However, some time/frequency resources may be allocated for contention-based access. Within these time/frequency resources, user equipment can transmit without being first scheduled. One situation where user equipment is doing contention-based access is, for example, random access, that is, when user equipment is performing initial access to a cell or to request uplink resources.
For scheduled access, the eNodeB scheduler assigns a user a unique frequency/time resource for transmitting uplink data. More specifically, the scheduler determines - which user equipment is allowed to transmit; - which physical channel resources (frequency), - Transport format (Transport Block Size (TBS - “Transport Block Size”) and Modulation Coding Scheme (MCS - “Modulation Coding Scheme”)) to be used by the terminal mobile for transmission
The allocation information is signaled to the user equipment through a scheduling grant, sent on the so-called L1/L2 control channel. For simplicity, this downlink channel is referred to as “uplink grant channel” below.
A schedule grant message (also called a resource assignment in this document) contains at least information which part of the frequency band the user equipment is authorized to use, the lease validity period, and the transport format that the user equipment is allowed to use. user must use for the next uplink transmission. The shortest validity period is a sub-frame. Additional information may also be included in the grant message, depending on the selected schema. Only “per user equipment” grants are used to grant the right to transmit on the UL-SCH Uplink Shared Channel (ie, there are no “per user equipment per RB” grants). Therefore, user equipment needs to distribute allocated resources among radio bearers according to the same rules, which will be explained in detail in the next section.
Unlike HSUPA, there is no transport format selection based on user equipment. The base station (eNodeB) decides the transport format based on some information, for example, reported scheduling information and QoS information, and the user equipment must follow the selected transport format. In HSUPA, the eNodeB assigns the maximum uplink resource and the user equipment therefore selects the current transport format for data transmissions.
Uplink data transmissions are only authorized to utilize the time-frequency resources assigned to the user equipment through the scheduling grant. If the user equipment does not have a valid lease, it is not authorized to transmit any uplink data. Unlike HSUPA, where each user equipment is always allocated a dedicated channel, there is only one multi-user shared uplink data channel (UL-SCH) for data transmissions.
To request resources, the user equipment transmits a resource request message to the eNodeB. This resource request message could, for example, contain information about the state of the buffer, the state of the power of the user equipment and some information related to Quality of Service (QoS). This information, which will be called scheduling information, allows eNodeB to perform an appropriate resource allocation. Throughout the document, it is assumed that the state of the buffer is reported to a group of radio bearers. Of course, other configurations for the buffer state report are also possible. Since radio resource scheduling is the most important function in a shared channel access network to determine Quality of Service, there are a number of requirements that must be met by the uplink scheduling scheme for LTE to allow for of efficient QoS (see 3GPP RAN WG#2 Tdoc. R2- R2-062606, “QoS operator requirements/use cases for services sharing the same bearer”, by T-Mobile, NTT DoCoMo, Vodafone, Orange, KPN; available at http ://www.3gpp.org/ and incorporated herein by reference): - Starvation of low priority services should be avoided - Clear QoS differentiation for radio carriers/services should be supported by the scheduling scheme - Uplink notification should allow fine-grained buffer reporting (eg by radio bearer or by radio bearer group) to allow the eNodeB scheduler to identify to which Radio Bearer/service the data should be sent. - It must be possible to make a clear differentiation of QoS between services of different users - It must be possible to provide a minimum bit rate per radio bearer
As can be seen from the list above, an essential aspect of the LTE scheduling scheme is to provide mechanisms with which the operator can control the partitioning of its aggregate cellular capacity among radio bearers of different QoS classes. The QoS class of a radio bearer is identified by the QoS profile of the corresponding SAE bearer signaled from the service portal to the eNodeB as described above. An operator can then allocate a certain amount of its aggregate cellular capacity to aggregate traffic associated with radio bearers of a certain QoS class.
The main objective of employing this class-based approach is to be able to differentiate packet handling depending on the QoS class they belong to. For example, as the load on the cell increases, it should be possible for an operator to control this by throttling traffic belonging to a low-priority QoS class. At this stage, high-priority traffic may still experience a low load situation, since the resources aggregated to this traffic are sufficient to serve it. This must be possible in both the uplink and downlink directions.
A benefit of employing this approach is giving the operator full control of the policies that govern bandwidth partitioning. For example, an operator policy could be to, even under extreme loads, avoid starvation of traffic belonging to its lowest priority QoS class. The prevention of low priority traffic starvation is one of the main requirements for the uplink scheduling scheme in LTE. In the current UMTS Version 6 (HSUPA) scheduling mechanism, the absolute prioritization scheme can lead to low priority application starvation. E-TFC selection (Enhanced Transport Format Combination selection) is done according to absolute logical channel priorities, i.e. high priority data transmission is maximized, which means that low-priority data is possibly swamped by high-priority data. To avoid starvation, the eNodeB scheduler must have a means to control which radio bearers a user equipment transmits data from. This mainly influences the design and use of scheduling grants transmitted on the L1/L2 control channel on the downlink. In the following, details of the uplink rate control procedure in LTE will be outlined. UPLINK RATE CONTROL PRIORITIZATION PROCEDURE / LOGICAL CHANNEL
For UMTS Long Term Evolution (LTE) uplink transmissions, there is a desire that starvation be avoided and greater flexibility in allocating resources between carriers possible, while retaining resource allocation by user equipment rather than of per user equipment carrier.
User equipment has an uplink rate control function that manages the sharing of uplink resources between radio carriers. This uplink rate control function is also called the following logical channel prioritization procedure. The Logical Channel Prioritization (LCP) procedure is applied when a new transmission is performed, that is, a transport block needs to be generated. One proposal for assigning capacity has been to assign resources to each carrier, in order of priority, until each has received an allocation equivalent to the minimum data rate for that carrier, after which any additional capacity is assigned to carriers in, for example, priority order.
As will become more evident from the description of the LCP procedure given below, the implementation of the LCP procedure residing on user equipment is based on the token bucket model, which is known in the IP world. The basic functionality of this model is as follows. Periodically, and at a given rate, a token representing the right to transmit an amount of data is added to the bucket. When user equipment is granted resources, it is allowed to transmit data up to the amount represented by the number of tokens in the bucket. When transmitting data, the user equipment removes the number of tokens equivalent to the amount of data transmitted. If the bucket is full, any additional tokens are discarded. For the addition of tokens, it can be assumed that the repetition period of this process would be all TTI, but it could be easily extended so that one token is only added every second. Basically, instead of every 1ms a token being added to the bucket, 1000 tokens could be added every second.
The logical channel prioritization procedure used in LTE Ver. 8 is described (see, for further details: 3GPP TS 36.321, “Evolved Universal Terrestrial Radio Access (E-UTJA)); Medium Access Control (MAC) protocol specification”, version 8.5, available at http://www.3gpp.org and incorporated herein by reference).
The RRC controls the uplink data scheduling by signaling for each logical channel: priority where a higher priority value indicates a lower priority level, prioritizedBitRate, which defines the Prioritized Bit Rate (PBR), bucketSizeDuration, which defines the Bucket Size Duration (BSD). The idea behind prioritized bitrate is to support for every carrier, including low-priority non-GBR carriers, a minimum bitrate to avoid potential starvation. Each carrier must at least get enough resources to achieve the prioritized bit rate (PRB).
The UE must maintain a variable Bj for each logical channel j. Bj must be initialized to zero when the related logical channel is established, and incremented by the product PBR x TTI duration for each TTI, where PBR is the prioritized bitrate of logical channel j. However, the value of Bj can never exceed the bucket size, and if the value of Bj is greater than the logical channel j bucket size, it must be set to the bucket size. The bucket size of a logical channel is equal to PBR x BSD, where PBR and BSD are configured by the upper layers.
The UE must perform the following logical channel prioritization procedure when a new transmission is performed. The uplink rate control function ensures that
The UE serves its radio bearer(s) in the following sequence: 1. All logical channels in descending priority order up to their configured PBR (according to the number of tokens in the bucket, which is indicated by Bj) ; 2. If any resources remain, all logical channels are served in descending priority order (regardless of the value of Bj) until the data for that logical channel or the UL lease is exhausted, whichever comes first. Logical channels configured with equal priority must be served equally.
If the PBRs are all set to zero, the first step is skipped and the logical channels are served in strict priority order: the UE maximizes the transmission of higher priority data.
The UE must also follow the rules below during the above scheduling procedures: - the UE must not segment an RLC SDU (or partially transmitted SDU or retransmitted RCL PDU) if the entire SDU (or partially transmitted SDU or retransmitted RCL PDU ) fit the remaining resources; - if the UE segments an RLC SDU from the logical channel, it should maximize the segment size to fill the lease as much as possible; - the UE must maximize data transmission.
Although, for LTE Ver. 8, only a prioritized bit rate (PBR) is used within the LCP procedure, there may also be additional enhancements in future releases. For example, similar to PBR, also a maximum bit rate (MBR - “maximum bit rate”) per GBR carrier and an aggregate maximum bit rate (AMBR - “aggregated maximum bit rate”) for all non-GBR carriers can be provided to the user equipment. MBR denotes a traffic bit rate per carrier while AMBR denotes a traffic bit rate per group of carriers. AMBR applies to all non-GBR SAE Carriers of a user equipment. SAE GBR carriers are outside the scope of AMBR. Multiple non-GBR SAE carriers can share the same AMBR. That is, each of these SAE carriers could potentially use the entire AMBR, for example, when the other SAE carriers do not carry any traffic. AMBR limits the aggregate bitrate that can be expected to be provided by non-GBR SAE carriers sharing AMBR. HARQ PROTOCOL OPERATION FOR UNICAST DATA TRANSMISSIONS
A common technique for detecting and correcting errors in systems transmitting packets over unreliable channels is called a hybrid Automatic Repeat request (HARQ - “hybrid Automatic Repeat request”). Hybrid ARQ is a combination of Forward Error Correction (FEC) and ARQ.
If an FEC-encoded packet is transmitted and the receiver cannot decode the packet correctly (errors are usually checked by a CRC (Cyclic Redundancy Check), the receiver requests a retransmission of the packet.
In LTE, there are two levels of retransmissions to provide reliability, namely, HARQ at the MAC layer and external ARQ at the RLC layer. External ARQ is required to handle residual errors that are not corrected by HARQ which is simplified by the use of a single bit error feedback mechanism, ie ACK/NACK. An N-process stop-and-wait HARQ is employed, which has asynchronous retransmissions on the downlink and synchronous retransmissions on the uplink. Synchronous HARQ means that retransmissions of HARQ blocks occur at predefined periodic intervals. Thus, no explicit signaling is required to indicate the retransmission schedule to the receiver. Asynchronous HARQ provides the flexibility to schedule retransmissions based on air interface conditions. In this case, some HARQ process identification needs to be signaled to allow correct comb and protocol operation. In 3GPP, HARQ operations with eight processes are used in LTE Ver. 8. The HARQ protocol operation for downlink data transmission will be similar or even identical to HSDPA.
In the uplink HARQ protocol operation, there are two different operations on how to schedule a retransmission. Retransmissions are scheduled by a NACK, by synchronous non-adaptive retransmission, or explicitly scheduled by PDCCH synchronous adaptive retransmissions. In the case of a synchronous non-adaptive retransmission, the retransmission will use the same parameters as previous uplink transmissions, that is, the retransmission will be signaled on the same physical channel resources respectively using the same modulation scheme. Since synchronous adaptive retransmissions are explicitly scheduled via PDCCH, eNodeB has the possibility to change certain parameters for the retransmission. A retransmission could, for example, be scheduled on a different frequency resource to avoid uplink fragmentation, or the eNodeB could change the modulation scheme or alternatively tell the user equipment which version of redundancy to use for the retransmission. It should be noted that HARQ feedback (ACK/NACK) and PDCCH signaling occur at the same time. Therefore, the user equipment only needs to check once if a synchronous non-adaptive retransmission is activated, if only NACK is received, or if the eNodeB requests a synchronous adaptive retransmission, ie the PDCCH has been signaled. L1/L2 CONTROL SIGNALING
To inform scheduled users about their allocation state, transport format, and other data-related information (eg, HARQ), L1/L2 control signaling needs to be transmitted on the downlink with “the data. Control signaling needs to be multiplexed with the downlink data into a subframe (assuming the user allocation can change from subframe to subframe). Here, it should be noted that user allocation can also be performed on the basis of TTI (Transmission Time Interval), where the duration of the TTI is a multiple of the sub-frames. The TTI duration can be fixed in a service area for all users, it can be different for different users, or it can be dynamic for each user. In general, L1/2 control signaling only needs to be transmitted once per TTI. L1/L2 control signaling is transmitted on the physical downlink control channel (PDCCH - “Physical Downlink Control Channel”). It should be noted that assignments for uplink data transmissions, uplink grants, are also transmitted on the PDCCH.
In general, PDCCH information sent in L1/L2 control signaling can be separated into Shared Control Information (SCI - “Shared Control Information”) and Dedicated Control Information (DCI - “Dedicated Control Information”). SHARED CONTROL INFORMATION (SCI)
Shared control information (SCI) carries information called Cat 1. The SCI portion of L1/L2 control signaling contains information related to resource allocation (indication). SCIs typically contain the following information: - User identity, indicating the user who is allocated - RB allocation information, indicating the resources (Resource Blocks, RBs) to which a user is allocated. Note that the number of RBs a user is allocated to can be dynamic. - Assignment duration (optional) if assignment over multiple sub-frames (or TTIs) is possible.
Depending on the configuration of the other channels and the configuration of the Dedicated Control Information (DCI), the SCI may additionally contain information such as ACK/NACK for uplink transmission, uplink scheduling information, information about the DCI (resource, MCS, etc.) .). DEDICATED CONTROL INFORMATION (DCI)
Dedicated Control Information (DCI) carries so-called Cat 2/3 information. The DCI part of the L1/L2 control signaling contains information related to the transmission format (Cat 2) of data transmitted to a scheduled user indicated by Cat 1. Also, in the case of ARQ (hybrid) application, they carry information of HARQ (Cat 3). DCIs only need to be decoded by the scheduled user in accordance with Cat 1. DCIs typically contain information about: - Cat 2: Modulation scheme, size (or encoding rate) of transport block (payload), etc. Note that both the transport block (or payload size) and encoding rate can be flagged. In any case, these parameters can be calculated from each other, using the modulation scheme information and the resource information (number of allocated RBs). - Cat 3: HARQ related information, eg a hybrid ARQ process number, redundancy version, relay sequence number. L1/L2 CONTROL SIGNALING INFORMATION FOR DOWNLINK DATA TRANSMISSION
Along with downlink packet data transmission, L1/L2 control signaling is transmitted on a separate physical channel (PDCCH). This L1/L2 control signal typically contains information about: - the physical channel resource(s) over which the data is transmitted (e.g. subcarriers or subcarrier blocks in the case of OFDM, codes in the case of CDMA). This information allows the user equipment (receiver) to identify the resources over which data is transmitted. - The Transport Format, which is used for transmission. This can be the data transport block size (payload size, information bit size), MCS (Modulation and Coding Scheme) level, spectral efficiency, code rate, etc. This information (usually with resource allocation) allows the user equipment (receiver) to identify the information bit size, modulation scheme and code rate to start the demodulation, de-rate-matching and process. of decoding. In some cases, the modulation scheme may be signaled explicitly. - HARQ information: - Process number: Allows the user equipment to identify the HARQ process to which the data is mapped.
Sequence number or new data indicator: Allows user equipment to identify whether the transmission is a new packet or a retransmitted packet. - Redundancy and/or constellation version: Tells the user equipment which version of hybrid ARQ redundancy is used (required for de-rate-matching) and/or which constellation modulation version is used (required for demodulation) - Identity Equipment ID (User Equipment ID): Tells which user equipment the L1/L2 control signaling is intended for. In typical implementations, this information is used to mask the L1/L2 control signaling CRC to prevent other user equipment from reading this information. L1/L2 CONTROL SIGNALING INFORMATION FOR UPLINK DATA TRANSMISSION
To enable an uplink packet data transmission, L1/L2 control signaling is transmitted on the downlink (PDCCH) to tell the user equipment about the transmission details. This L1/L2 control signal typically contains information about: - the physical channel resource(s) over which the user equipment must transmit data (e.g. subcarriers or subcarrier blocks in the case of OFDM, codes in the case of CDMA). - The transport format that the user equipment must use for transmission. This can be the data transport block size (payload size, information bit size), MCS (Modulation and Coding Scheme) level, spectral efficiency, code rate, etc. This information (usually with resource allocation) allows the user equipment (transmitter) to obtain the information bit size, modulation scheme and code rate information to start the modulation, de-rate-matching and process. of encoding. In some cases, the modulation scheme may be signaled explicitly. - Hybrid ARQ information: - Process number: Tells the user equipment from which hybrid ARQ process it should get the data. - Sequence number or new data indicator: Tells the user equipment to transmit a new data packet or to retransmit a packet. - Redundancy and/or constellation version: Tells the user equipment which hybrid ARQ redundancy version to use (required for de-rate-matching) and/or which modulation constellation version to use (required for demodulation). - User Equipment Identity (User Equipment ID): Says which user equipment should transmit the data. In typical implementations, this information is used to mask the L1/L2 control signaling CRC to prevent other user equipment from reading this information. There are several different types of exactly how to convey the pieces of information mentioned above. In addition, L1/L2 control information may also contain additional information or may omit some of the information. For example: - the HARQ process number may not be needed in case of a synchronous HARQ protocol. - A constellation and/or redundancy version may not be necessary if Search Combination is used (always the same redundancy and/or constellation version) or if the redundancy sequence and/or constellation versions are pre-defined. - Power control information can be additionally included in control signaling. - MIMO-related control information, such as eg precoding, can be additionally included in the control signaling. - In case of multi-codeword MIMO transmission, the transport format and/or HARQ information for multiple codewords can be included.
For uplink resource assignments (PUSCH) signaled on the PDCCH in LTE, the L1/L2 control information does not contain a HARQ process number as a synchronous HARQ protocol is employed for the LTE uplink. The HARQ process to be used for an uplink transmission is given by timing. Also, it should be noted that the redundancy version information (RV - “Redundancy Version”) is encoded together with the transport format information, i.e. the RV information is embedded in the transport format field (TF - “Transport Format”). The TF, respectively the MCS field, has, for example, a size of 5 bits, which corresponds to 32 entries. 3 TF/MCS entries are reserved to indicate RVs 1, 2 or 3. The remaining MCS table entries are used to signal the MCS level (TBS) implicitly indicating RVO. The PDCCH CRC field size is 16 bits.
For downlink assignments (PDSCH) signaled on the PDCCH in LTE, the redundancy version (RV) is signaled separately in a two-bit field. In addition, the modulation order information is encoded together with the transport format information. Similar to the uplink case, there is a 5-bit MCS field signaled in the PDCCH. Three of the inputs are reserved to signal an explicit modulation order, not providing transport format (transport block) information. For the remaining 29 inputs, the modulation order and transport block size information are flagged. UPLINK POWER CONTROL
Uplink transmitter power control in a mobile communication system serves an important purpose: it balances the need for sufficient transmit power per bit to achieve the required QoS against the need to minimize interference to other system users and maximize life. of the mobile terminal battery. To achieve this, the role of the Power Control (PC) becomes decisive to provide the required SINR (Signal to Noise Interference Ratio) while controlling, at the same time, the interference caused to neighboring cells. The idea of classic PC uplink schemes is that all users are greeted with the same SINR, which is known as full compensation. As an alternative, 3GPP has adopted Fractional Power Control (FPC) for LTE. This new functionality makes users with high path loss operate at a lower SINR requirement, so they are likely to generate less interference to neighboring cells.
Detailed power control formulas are specified in LTE for Physical Uplink Shared Channel (PUSCH), Physical Uplink Control Channel (PUCCH) and Sound Reference Signals (SRSs) (see section 5.1 of 3GPP TS 36.213, “Physical layer procedures (Release 8)”, version 8.6.0, available at http://www.3gpp.org). The respective power control formula for each of these uplink signals follows the same basic principles. They can be thought of as the sum of two main terms: a basic open-loop operating point derived from static or semi-static parameters signaled by the eNodeB, and an updated dynamic shift from subframe to subframe.
The basic open-loop operating point for transmit power per resource block depends on a number of factors, including intercellular interference and cell load. It can be further divided into two components, a semi-static base level PO, additionally comprising a common power level for all user equipment (UEs) in the cell (measured in dBm) and a UE-specific offset, and an open loop path loss compensation. The dynamic power displacement part per resource block can be further divided into two components, a Modulation and Coding Scheme dependent component (MCS - “Modulation and Coding Scheme”) and Transmitter Power Control commands (TPC - “ Transmitter Power Control”) explicit.
The MCS-dependent component (referred to in the LTE specification as ΔTF, where TF stands for “Transport Format”) allows the transmitted power per resource block to be adapted according to the transmitted information data rate. .
The other component of dynamic displacement is the UE-specific TPC commands. These can operate in two different modes: - cumulative TPC commands (available for PUSCH, PUCCH and SRS) and - absolute TPC commands (available for PUSCH only).
For PUSCH, switching between these two modes is configured semi-statically for each UE via RRC signaling - that is, the mode cannot be dynamically changed. With cumulative TPC commands, each TPC command signals a power step relative to the previous level.
Formula (1) below shows the transmit power from the user equipment in dBm to the PUSCH:
where: PMAX is the maximum available transmit power of the user equipment, which depends on the class and configuration of the user equipment over the network. M is the number of allocated physical resource blocks (PRBs). PL is the user equipment path loss derived at the UE based on the measurement of RSRP (Reference Signal Received Power) and signaled RS (Reference Symbol) eNodeB transmit power. ΔMCS is an MCS dependent power offset defined by the eNodeB. PO_PUSCH is a UE specific parameter (partially transmitted and partially signaled using RRC). α is a cell-specific parameter (transmitted in BCH). Δi are closed-loop PC commands signaled from the eNodeB to the user equipment the function f() indicates whether closed-loop commands are relative, cumulative, or absolute. The f() function is signaled to user equipment through higher layers. ADDITIONAL ADVANCES FOR LTE (LTE-A)
The frequency spectrum for IMT-Advanced was decided at the World Radiocommunication Conference 2007 (WRC-07). Although the overall frequency spectrum for IMT-Advanced has been decided, the frequency bandwidth available is different according to each region or country.
Following the decision on the available frequency spectrum delineation, however, the standardization of a radio interface started in the 3rd Generation Partnership Project (3GPP). At the 39th 3GPP TSG RAN meeting, the Study Item description in “Further Advancements for E-UTRA (LTE-Advanced)” was approved. The study item covers technology components to be considered for E-UTRA evolution, eg fulfilling IMT-Advanced requirements. Two major technology components, which are currently under consideration for LTE-A, are described below. LTE-A SUPPORT FOR GREATER BANDWIDTH
Carrier aggregation, where two or more component carriers are aggregated, is considered for LTE-A to support higher transmission bandwidths, eg up to 100 MHz, and for spectrum aggregation.
A terminal can simultaneously receive or transmit on one or more component carriers depending on their capabilities:
An LTE-A terminal with receive and/or transmit capabilities for carrier aggregation can simultaneously receive and/or transmit on multiple component carriers. There is one transport block (in the absence of spatial multiplexing) and one HARQ entity per component carrier. - An LTE Ver terminal. 8 can receive and transmit on a single component carrier only, as long as the component carrier structure follows the specifications of Ver. 8.
It will be possible to configure all component carriers compatible with LTE Ver. 8, at least when the numbers of aggregated component carriers on the uplink and downlink are the same. Consideration of non-backward compatible configurations of LTE-A component carriers is not precluded
At present, LTE-A supports carrier aggregation for both contiguous and non-contiguous component carriers, with each component carrier limited to a maximum of 110 Resource Blocks (RBs) in the frequency domain, using LTE Ver. 8. It is possible to configure a user equipment to aggregate a different number of component carriers originating from the same eNodeB. Please note that component carriers originating from the same eNodeB do not necessarily need to provide the same coverage.
Furthermore, a user equipment can be configured with different uplink and downlink bandwidths: - The number of downlink component carriers that can be configured depends on the downlink aggregation capability of the user equipment; - The number of uplink component carriers that can be configured depends on the uplink aggregation capability of the user equipment; - It is not possible to configure a user equipment with more component carriers than downlink component carriers; - In typical TDD deployments, the number of component carriers and the bandwidth of each component carrier on the uplink and downlink is the same.
The spacing between the center frequencies of continuously aggregated component carriers is a multiple of 300 kHz. This is to support the 100 kHz sweep frequency of LTE Ver. 8 and, at the same time, preserve the orthogonality of the subcarriers with 15 kHz spacing. Depending on the aggregation situation, n x 300 kHz spacing can be facilitated by inserting a low number of unused subcarriers between contiguous component carriers.
The nature of multi-carrier aggregation is only exposed up to the MAC layer. For uplink and for downlink there is a required HARQ entity in the MAC for each aggregated component carrier. There is (in the absence of an uplink multiple input multiple input multiple output (SU-MIMO) for uplink) at most one transport block per component carrier. A transport block and its potential HARQ retransmissions need to be mapped to the same component carrier. The Layer 2 structure with carrier aggregation configured is shown in Figure 5 and Figure 6 for the downlink and uplink, respectively.
When carrier aggregation is configured, the user equipment has only one RRC connection to the network. On RRC connection establishment/reestablishment, a cell provides security input (an ECGI, a PCI, and an ARFCN) and mobility information (e.g., tracking area identifier (TAI) from stratum non-access stratum (NAS - “non-access stratum”), similar to LTE Ver. 8. After the establishment/re-establishment of the RRC connection, the component carrier corresponding to that cell is called the Downlink Primary Component Carrier (DL PCC - “Downlink Primary Component Carrier”) on the downlink. There is always one DL PCC and one UL PCC configured per user equipment in connected mode. Within the configured set of component carriers, other component carriers are called Secondary Component Carriers (SCCs).
The characteristics of DL PCC and UL PCC are: - UL PCC is used for transmitting Layer 1 (L1) uplink control information; - DL PCC cannot be deactivated; - The reestablishment of the DL PCC is activated when the DL PCC goes through Radio Link Failure (RLF - “Radio Link Failure”), but not when the DL SCCs go through RLF; - DL PCC may change upon transfer; - The NAS information is obtained from the DL PCC cell.
Reconfiguration, addition and removal of component carriers can be accomplished by RRC signaling. In intra-LTE transfer, the RRC can also add, remove, or reconfigure component carriers for use in the target cell. When adding a new component carrier, dedicated RRC signaling is used to send component carrier system information, which is required for component carrier transmission/reception (analogous to LTE Ver. 8 for handoff).
When carrier aggregation is configured, user equipment can be scheduled on multiple component carriers simultaneously, but at most one random access procedure must be running at any one time. Inter-carrier scheduling allows the PDCCH of one component carrier to schedule resources on another component carrier. For this purpose, a component carrier identification field is introduced in the respective DCI formats (called “CIF”). A connection between uplink and downlink component carriers allows identification of the uplink component carrier for which the lease applies when there is no scheduling between carriers. Connecting downlink component carriers to uplink component carriers does not necessarily have to be one-to-one. In other words, more than one downlink component carrier can connect to the same uplink component carrier. At the same time, a component carrier can only connect to an uplink component carrier. (DE)ACTIVATION OF A COMPONENT CARRIER AND DRX OPERATION
In carrier aggregation, whenever a user equipment is configured with only one component carrier, LTE Ver. 8 applies. In other cases, the same DRX operation applies to all configured and activated component carriers (ie identical active time for PDCCH monitoring). When in active time, any component carrier can always schedule a PDSCH on any other configured and activated component carrier.
To allow for reasonable UE battery consumption when aggregation is configured, a component carrier enable/disable mechanism for downlink SCells is introduced (ie enable/disable does not apply to the PCC). When a downlink SCell is not active, the UE does not need to receive the corresponding PDCCH or PDSCH, nor does it need to perform CQI measurements. Conversely, when a downlink SCC is active, the user equipment must receive the PDSCH and PDCCH (if present), and is expected to be able to perform CQI measurements. On the uplink, however, a user equipment is always required to be able to PUSCH any configured uplink component carriers when scheduled on the corresponding PDCCH (ie, there is no explicit activation of uplink component carriers).
Other details of the activation/deactivation mechanism for SCCs are: - Explicit activation of DL SCCs is done by MAC signaling; - Explicit deactivation of DL SCCs is done by MAC signaling; - Implicit deactivation of downlink SCells is also possible; - DL SCCs can be enabled and disabled individually, and a single enable/disable command can enable/disable a subset of configured DL SCCs; - SCCs added to the set of configured component carriers are initially “disabled”. TIME ADVANCE
As already mentioned above, for the 3GPP LTE uplink transmission scheme, single-carrier frequency division multiple access (SC-FDMA) was chosen to achieve orthogonal multiple access in time and frequency between different user equipment transmitting on the uplink.
Uplink orthogonality is maintained by ensuring that transmissions from different user equipment in a cell are time-aligned at the eNodeB receiver. This prevents intracellular interference from occurring, both between user equipment assigned to transmit on consecutive sub-frames and between user equipment transmitting on adjacent sub-carriers. Time alignment of uplink transmissions is achieved by applying a time advance to the user equipment transmitter, relative to the received downlink time as exemplified in Figure 7. The main role of this is to counteract different propagation delays between different user equipment. INITIAL TIME ADVANCE PROCEDURE
When user equipment is synchronized to downlink transmissions received from an eNodeB, the initial time advance is set using the random access procedure as described below. User equipment broadcasts a random access preamble, based on which the eNodeB can estimate the uplink time. The eNodeB responds with an 11-bit initial time-advance command contained within the Random Access Response (RAR) message. This allows the time advance to be configured by the eNodeB with a granularity of 0.52 μs from 0 to a maximum of 0.67 ms.
Additional information on controlling uplink timing and timing advance in 3GPP LTE (Version 8/9) can be found in chapter 20.2 by Stefania Sesia, Issam Toufik and Matthew Baker, “LTE - The UMTS Long Term Evolution: From Theory to Practice”, John Wiley & Sons, Ltd. 2009, which is incorporated herein by reference. UPDATES ON TIME ADVANCE
Once the time advance was initially set for each user device, the time advance is updated from time to time to counteract changes in the arrival time of uplink signals at the eNodeB. By deriving the time-advance update commands, the eNodeB can measure any uplink signal that is useful. The details of uplink time measurements in eNodeB are not specified but are left to the eNodeB implementation.
Time-advance update commands are generated at the Media Access Control (MAC) layer in eNodeB and transmitted to user equipment as MAC control elements that can be multiplexed with data on the physical downlink shared channel (PDSCH - “Physical Downlink Shared Channel”). Similar to the initial time-advance command in response to the Random Access Channel (RACH) preamble, the update commands have a granularity of 0.52 μs. The range of the update commands is ±16 μs, allowing a step change in uplink timing equivalent to the length of the extended cyclic prefix. They would typically be sent no more often than about every 2 seconds. In practice, quick updates are unlikely to be necessary, since, even for user equipment moving at 500 km/h, the change in round-trip path length is no more than 278 m/s, corresponding to to a change in round-trip time of 0.93 μs/s.
eNodeB balances the overhead of sending regular time update commands to all UEs in the cell against the ability for a UE to transmit quickly when data arrives in its transmit buffer. The eNodeB therefore sets a timer for each user equipment, which the user equipment resets each time a time advance update is received. If the user equipment does not receive another time-advance update before the timer expires, it should then be considered to have lost uplink synchronization (see also section 5.2 of 3GPP TS 36.321, “Evolved Universal Terrestrial Radio Access (E-UTIA); Medium Access Control (MAC) protocol specification”, version 8.9.0, available at http://www.3gpp.org and incorporated herein by reference).
In such a case, to avoid the risk of interfering with uplink transmissions from other user equipment, the UE is not allowed to perform another uplink transmission of any kind, and must revert to the initial time alignment procedure to restore the time. of uplink. RANDOM ACCESS PROCEDURE
A mobile terminal on LTE can only be scheduled for uplink transmission if its uplink transmission is time synchronized. Therefore, the Random Access (RACH) procedure plays an important role as an interface between unsynchronized mobile terminals (UEs) and the orthogonal transmission of uplink radio access.
Essentially, Random Access in LTE is used to achieve time synchronization for a user equipment that has not yet achieved it, or has lost its uplink synchronization. Once a user device has achieved uplink synchronization, eNodeB can schedule uplink transmission resources for it. The following situations are therefore relevant for random access: - A user device in the RRC_CONNECTED state, but with an unsynchronized uplink, wishing to send new uplink data or control information - A user device in the RRC_CONNECTED state, but with no uplink synchronized, required to receive downlink data, and therefore transmit corresponding HARQ feedback, i.e. ACK/NACK, on the uplink. This situation is also called Downlink data arrival - A user device in the RRC_CONNECTED state, transferring from its current server cell to a new target cell; to achieve synchronization at the uplink time in the target cell, the Random Access procedure is performed - A transition from the RRC_IDLE state to the RRC_CONNECTED state, e.g. for initial access or tracking area updates - Recover from a radio link failure , ie, RRC connection re-establishment There is an additional case, where the user equipment performs the random on procedure, despite the user equipment being synchronized in time. In this situation, the user equipment uses the random access procedure to send a scheduling request, i.e., uplink buffer status report, to its eNodeB, if it does not have any other uplink resource allocated to send the scheduling request. , that is, the dedicated scheduling request channel (D-SR - “dedicated scheduling request”) is not configured.
LTE offers two types of random access procedures that allow access to be contention-based, that is, implying an inherent risk of collision, or contention-free (not contention-based). It should be noted that contention-based random access can be applied to all six situations listed above, whereas a non-contention-based random access procedure can only be applied to the situation of downlink and transfer data arrival.
In the following, the random access procedure will be described in more detail in relation to Figure 8. A detailed description of the random access procedure can also be found in 3GPP 36.321, section 5.1.
Figure 8 shows the LTE contention-based RACH procedure. This procedure consists of four “steps”. First, the user equipment transmits 801 a random access preamble on the physical random access channel (PRACH) to the eNodeB. The preamble is selected by the user equipment from the set of available random access preambles reserved by the eNodeB for contention-based access. In LTE, there are 64 preambles per cell that can be used for contention-free as well as contention-based random access. The set of contention-based preambles can be further subdivided into two groups, so that the preamble choice can carry a bit of information to indicate information related to the amount of transmission resources needed to transmit for the first scheduled transmission, which is msg3 call on TS36.321 (see step 703). The system information passed in the cell contains information about which signatures (preambles) are in each of the two subgroups, as well as the meaning of each subgroup. User equipment randomly selects a preamble from the subgroup corresponding to the size of transmission resources required for message transmission 3.
After the eNodeB detects a RACH preamble, it sends 802 a random access response (RAR) message on the PDSCH (physical downlink shared channel) addressed on the PDCCH with the RA-RNTI (random access) identifying the time-frequency slot in which the preamble was detected. If multiple user devices transmitted the same RACH preamble on the same PRACH resource, which is also called a collision, they would receive the same random access response.
The RAR message transmits the detected RACH preamble, a time alignment command (TA command) for synchronization of subsequent uplink transmissions, an allocation of uplink resources (grant) for the transmission of the first scheduled transmission (see step 803 ) and an assignment of a Temporary Cell Radio Network Temporary Identifier (T-CRNTI). This T-CRNTI is used by the eNodeB to address mobile devices whose RACH preamble has been detected until the RACH procedure is completed, since the “real” identity of the mobile device is not, at this point, known by the eNodeB. .
In addition, the RAR message may also contain a so-called fallback indicator, which the eNodeB can set to instruct the user equipment to fall back for a period of time before attempting random access again. The user equipment monitors the PDCCH by receiving the random access response within a given time window, which is configured by the eNodeB. If the user equipment does not receive a random access response within the configured time window, it retransmits the preamble at the next PRACH opportunity considering a potential backoff period.
In response to the RAR message received from the eNodeB, the user equipment transmits 803 the first scheduled uplink transmission on the grant-assigned resources within the random access response. This scheduled uplink broadcast transmits the actual random access procedure message, such as an RRC connection request, a trace area update, or a buffer state report. Also includes C-RNTI for user devices in RRC_CONNECTED mode or the unique 48-bit user device identity if user devices are in RRC_IDLE mode. If a preamble collision has occurred, i.e., multiple user devices sent the same preamble on the same PRACH resource, the colliding user devices will receive the same T-CRNTI within the random access response and will also collide on the same uplink resources. when they transmit 803 their scheduled transmission. This may result in interference where no transmissions from a colliding user equipment can be decoded on the eNodeB, and the user equipment will restart the random access procedure after reaching the maximum number of retransmissions for their scheduled transmissions. If the scheduled transmission of one user device is successfully decoded by the eNodeB, the contention remains unresolved for the other user devices.
To resolve this type of contention, the eNodeB sends 804 a contention resolution message addressed to the C-RNTI or the temporary C-RNTI, and in the latter case it echoes the 48-bit user equipment identity contained in the scheduled transmission. . It supports HARQ. In the case of collision followed by a successful decoding of the message sent in step 803, the HARQ feedback (ACK) is only transmitted by the user equipment that detects its own identity, C-RNTI or unique user equipment ID. Other UEs understand that there was a collision in step 1 and can quickly exit the current RACH procedure and start another one.
Figure 9 is illustrating the contention-free random access procedure of 3GPP LTE Ver. 8/9. Compared to the contention-based random access procedure, the contention-free random access procedure is simplified. The eNodeB provides 901 preamble user equipment to use for random access, so that there is no risk of collisions, ie multiple user equipment transmitting in the same preamble. Therefore, the user equipment is sending 902 the preamble that was signaled by the eNodeB on the uplink in a PRACH resource. Since the case where multiple UEs are sending the same preamble is avoided for contention-free random access, a contention resolution is not required, which in turn implies that step 804 of the contention-based procedure shown in Figure 8 may be omitted. Essentially, a contention-free random access procedure is terminated after having successfully received the random access response. TIME ADVANCE AND COMPONENT CARRIER AGGREGATION IN UPLINK
In current specifications of the 3GPP standards, user equipment only maintains a time-advance value and applies this to uplink transmissions on all aggregated component carriers. When component carriers are aggregated from different bands, they may experience different interference and coverage characteristics.
Furthermore, the implementation of technologies such as Frequency Selective Repeaters (FSR - “Frequency Selective Repeaters”) shown, for example, in Figure 11 and Remote Radio Heads (RRH - “Remote Radio Heads”), as shown, for example , in Figure 12, will cause different interference and propagation situations for the aggregated component carriers. This leads to the need to introduce more than one time advance within a user device.
This leads to the need to introduce more than one time advance within a UE. There may be a separate time advance for each aggregated component carrier. Another option is that component carriers that derive from the same location, and thus all that face a similar propagation delay, are grouped into time-advance groups (TA groups). A separate time advance is maintained for each group.
Discussions have already taken place in 3GPP on this issue, however a single time advance for all aggregated uplink component carriers is considered sufficient, as current specifications, up to 3GPP LTE-A Ver. 10, only support carrier aggregation of carriers of the same frequency band.
Therefore, prioritization of different types of uplink transmissions on a plurality of component carriers during the same transmission time interval (TTI) needs to be considered.
For example, when a user equipment (UE) is in the power limited state, rules need to determine which uplink transmission should receive the available power. SUMMARY OF THE INVENTION
An object of the invention is to propose strategies on how a mobile terminal uses the available transmission power for uplink transmissions of multiple transport blocks within a time interval in case a mobile terminal is power limited, i.e. the power of transmission that would be required to transmit the multiple transport blocks within the transmit timeslot according to the uplink resource allocations is exceeding the transmit power available for uplink transmissions within a transmit timeslot.
Another object of the invention is to propose strategies and methods of how a mobile terminal uses the available transmission power for uplink transmissions within a transmission time interval in power limited situations, that is, in situations where the transmission power that would be required to transmit over the physical random access channel (PRACH) and physical uplink shared channel (PUSCH) / physical uplink control channel (PUCCH) is exceeding the transmit power available for uplink transmissions within the given time slot .
A further object of the invention is to propose strategies and methods on how the delay imposed by RACH procedures for uplink component carriers to be time aligned can be reduced in systems using uplink carrier aggregation.
At least one of these objects is resolved by the matter of independent claims. Advantageous embodiments are matters of the dependent claims.
A first aspect of the invention is the prioritization of power application to transport blocks corresponding to multiple uplink resource assignments within power control. This aspect is particularly applicable to situations where the mobile terminal is power-limited. In accordance with this aspect of the invention, the processing order of the uplink resource assignments (priority order) on the uplink component carriers is used to determine the power scaling for the power allocation of the individual transport blocks to be transmitted on the uplink component carriers. respective component carriers on the uplink. In power-limited situations, the mobile terminal reduces the transmit power for transmitting each of the transport blocks according to the priority of the respective transport block given in order of priority, so that the total transmit power used for transport block transmissions becomes less than or equal to the maximum transmission power available to the mobile terminal to transmit the transport blocks.
According to an exemplary implementation, transmit power scaling by reducing transmit power is taking into account the priority of resource allocation of a respective transport block/component carrier on which the respective transport block is to be transmitted, as given in the order of priority/processing in which the transmission of transport blocks having the high priority should be least affected by the transmission power reduction.
Advantageously, the lower (higher) the priority of the resource allocation/component carrier according to the order of priority, the higher (lower) the power reduction applied to transmit power for the transport block required by its corresponding resource allocation. Ideally, the transmit power of high-priority transport blocks should not be reduced if possible, instead, the reduction of transmit power to fulfill a maximum transmit power available to the mobile terminal to transmit the transport blocks should be first attempted by limiting transmit power to low-priority transport block transmissions.
A second aspect of the invention is the prioritization of power allocation for simultaneous uplink transmissions over different physical channels (ie, there are multiple uplink transmissions within the same time slot). Examples for physical channels allowing uplink transmissions include the physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and the physical random access channel (PRACH). Prioritization of power allocation for uplink transmission over different physical channels allows for the allocation of individual transmission powers. This power allocation may be independent of the component carrier on which a respective uplink transmission is sent.
In accordance with this second aspect, different transmission power levels can be used for simultaneous uplink transmissions over a physical random access channel (PRACH) and over a shared physical uplink channel (PUSCH). Alternatively, the second aspect of the invention can also be used to individually scale transmission power for simultaneous uplink transmissions over a physical random access channel (PRACH) and over a physical uplink control channel (PUCCH). Transmit power scaling for uplink transmissions based on a prioritization of physical channels can, for example, be used to improve the SINR of the respective uplink transmission over the prioritized physical channel. For example, a reduction in transmit power for uplink transmissions based on prioritization of physical channels may allow the mobile terminal to achieve a given power constraint if the mobile terminal is in a power limited situation.
In an exemplary embodiment of the invention which is in accordance with the second aspect of the invention, the transmit power for transmissions of the physical uplink shared channel (PUSCH) and/or the physical random access channel (PRACH) is reduced in accordance with a respective prioritization of the corresponding channels. In this context, transmit power for physical uplink shared channel (PUSCH) transmissions is prioritized above transmit power for physical random access channel (PRACH) transmissions or vice versa. Advantageously, the lower (higher) the priority of physical channel transmission, the greater (lower) the power reduction applied to transmit power to transmit over the physical channel. Ideally, to achieve a transmit power constraint in a power limited situation, a transmit power constraint for low priority physical channel transmissions can first be attempted, and then - if the transmit power constraint is not yet met - also the transmit power for higher priority physical channel transmissions may be limited.
A third aspect of the invention is to adjust transmit power used to perform random access procedures (RACH) based on the number of RACH procedures required to time align multiple uplink component carriers. Depending on the number of uplink and component carriers that must be time aligned, a mobile terminal performs one or more RACH procedures to time align the uplink component carriers. A RACH procedure requires processing resources and introduces restrictions on the uplink transmissions that can be performed in parallel by a mobile terminal. It may therefore be desirable to perform as few RACH procedures as possible. Adjusting the transmit power based on the number of RACH procedures required can improve the probability of success for each of the RACH procedures. Due to a higher probability of success of RACH procedures, the delay introduced by RACH procedures for uplink component carriers to be time aligned is reduced.
According to an exemplary embodiment, a user equipment could utilize the transmit power of one or more RACH procedures that are not required (i.e., that are superfluous and thus not performed) to adjust the transmit power to perform only the RACH procedures to time-align the multiple component carriers improve the probability of success of each of the required RACH procedures.
The first, second and third aspects of this invention can be readily combined with each other and can use the same order of priority/processing of resource assignments in transport block generation (prioritization of logical channels) and uplink transmission in a physical random access channel (PRACH) and the power scaling of the transmissions of the generated transport blocks and the transmission on a physical random access channel (PRACH) in the uplink.
According to an exemplary implementation of the invention in accordance with the first and second aspects of the invention, a method for adjusting the transmission power used by a mobile terminal for uplink transmissions is provided, wherein the mobile terminal is configured with at least a first and a second uplink component carrier. The mobile terminal determines a transmit power required to transmit a PPUSCH(I) transport block over a shared physical uplink channel on the first uplink component carrier. Furthermore, the mobile terminal determines a transmit power required to transmit a random access preamble PPRACH (i) over a physical random access channel on the second uplink component carrier. Furthermore, the mobile terminal reduces the transmission power determined for the transmission of the physical uplink shared channel and/or the transmission of the physical random access channel according to a prioritization between the transmission power for the transmission of the uplink shared channel. physical and transmit power for transmitting the physical random access channel and transmits the transport block on the first uplink component carrier and the random access preamble on the second uplink component carrier within a transmission time slot i, using the respective transmission powers.
In an exemplary implementation, the mobile terminal may additionally determine a transmit power required to transmit another transport block over a shared physical uplink channel on a third component carrier. The transmit powers for transmitting each PPUSCHC transport block (i) are determined according to the corresponding uplink component carrier c, where the uplink component carriers have a priority order. Furthermore, the mobile terminal reduces the transmission power determined to transmit each transport block Wc . PPUSCHC(Í) according to the order of priority, where Wc is [0,...,l]; and transmits each transport block using its reduced transmit power.
In a more detailed implementation, transmit power to transmit over a shared physical uplink channel is prioritized over transmit power to transmit over a physical random access channel. In this case, the mobile terminal first reduces the transmission power determined PPRACH (i) to transmit the random access preamble over the physical random access channel and then reduces the transmission power
to transmit each transport block over the physical uplink shared channels on the uplink component carriers within the transmission time slot i.
Furthermore, in another exemplary embodiment of the invention, the transmit power of physical random access channel transmissions is prioritized over the transmit power of physical uplink shared channel transmissions. In this case, the mobile terminal reduces the power of ∑PpUSCHcO) transmission
for transmission over the physical uplink shared channels on the uplink component carriers, uses the determined transmit power PPRACH (i) for transmission over the physical random access channel and uses an unreduced transmit power PPUCCH (!) to transmit on a physical uplink control channel within transmission time slot i.
In another exemplary embodiment of the invention, the mobile terminal reduces the determined transmit powers so that the sum of the determined transmit powers is less than or equal to the maximum PMAX transmit power available to the mobile terminal to transmit on the uplink component carriers within the range of transmission time i.
In a further exemplary embodiment of the invention, the mobile terminal further determines a transmit power required to transmit another random access preamble over a physical random access channel on a fourth uplink component carrier within the transmission time slot i. The transmit powers for transmitting each PPRACHC(I) random access preamble are determined according to the corresponding uplink component carrier c, where the uplink component carriers have a priority order. Furthermore, the mobile terminal reduces the transmission powers determined to transmit each random access preamble Wc • PPRACHC (i) according to the order of priority, where Wc £ [0,... ,1]; and transmits each random access preamble using its reduced transmit power.
In another more detailed implementation, each uplink component carrier is assigned a cell index, and the mobile terminal reduces the transmission power determined to transmit each random access preamble Wc PPRACHC (!) based on the order of priority given by the indices of cell from the component carriers.
Furthermore, in another exemplary implementation of the invention, the mobile terminal is configured with one uplink component carrier as the primary component carrier and with any other uplink component carrier as a secondary component carrier. In this case, the mobile terminal reduces the transmission power determined to transmit each random access preamble Wc - PPRACHC(I), where the primary component carrier is prioritized over any other secondary component carrier.
According to another implementation of the invention, the mobile terminal reduces transmission power to transmit each WC.PPRACHC (i) random access preamble based on a signal for each random access preamble. The signaling indicates, for each random access preamble to be transmitted, whether a request to transmit the respective random access preamble was previously received for the corresponding uplink component carrier by the terminal.
In another embodiment of the invention, the mobile terminal determines the transmit power to transmit a random access preamble over a random access channel on each of the second and fourth component carriers using a first PO_PRACH offset, if the uplink component carrier is be time-aligned and the uplink component carriers already time-aligned belong to the same time-advance group; and a second and different offset P0_pRACHmuitipie, in case the uplink component carrier to be time-aligned and the already time-aligned component carriers belong to more than one time-advance group.
In a more detailed implementation of the invention, the first offset PO_PRACH and the second offset P0_pRACHmultiple are signaled to the mobile terminal by a base station.
In a further exemplary embodiment, the mobile terminal determines transmit power to transmit a random access preamble over a physical random access channel on an uplink component carrier to be time aligned includes reusing a predetermined power increment step NC for the corresponding uplink component carrier or reuse a different predetermined power increment step Nc for a different uplink component carrier. The mobile terminal uses the NC and/or N-c power ramp step to increase the transmit power of consecutive random access preamble transmissions.
Also, in a detailed implementation, the mobile terminal determines the transmit power to transmit a random access preamble over a physical random access channel on an uplink component carrier via:
where N and {NC, Nc}, if the uplink component carrier to be time-aligned and the time-aligned component carriers belong to the same time-advance group; and
where N and {NC, NC}, if the uplink component carrier to be time-aligned and the time-aligned component carriers belong to more than one time-advance group.
In another embodiment of the invention, the mobile terminal adds a base station dependent prescaling offset Δoffsetc that was received by the mobile terminal from a base station to a component c carrier to adjust the transmit power for transmitting preambles of random access on the respective uplink component carrier.
Furthermore, in a detailed implementation of the invention, the mobile terminal determines the transmit power to transmit a random access preamble over a physical random access channel on an uplink component carrier via:
where N and {NC, Nc}, if the uplink component carrier to be time-aligned and the time-aligned component carriers belong to the same time-advance group, and
where N and {NC, Nc}, in case the uplink component carrier to be time-aligned and the already time-aligned component carriers belong to more than one time-advance group.
According to another exemplary implementation of the invention in accordance with the second and third aspects of the invention, a method for adjusting the transmission power used by a mobile terminal for one or more RACH procedures is provided, where the mobile terminal is allowed to RACH access on multiple uplink component carriers. The mobile terminal determines, for uplink component carriers to be time aligned, the number of RACH procedures required to time align the uplink component carriers. In addition, the mobile terminal performs the specified number of RACH procedures required to time align the uplink component carriers, whereby a transmit power for all one or more RACH procedures is determined in accordance with the specified number of procedures. of RACH.
In a more advanced implementation, the mobile terminal determines the transmit power for all one or more RACH procedures using a first PO_PRACH offset, in the case of determining a required RACH procedure, and using a second and different offset P0_PRAcHmultiple, in the case of determining more than one RACH procedure, the second offset P0_PRAcHmultiple having a higher value than the first offset PO_PRACH .
According to another alternative embodiment, the mobile terminal is configured with an uplink component carrier as the primary component carrier and or another uplink component carrier as a secondary component carrier. The mobile terminal determines the transmit power for RACH procedures using a first PO_PRACH offset if a RACH procedure is to be performed on the primary component carrier, and using a second and different P0_PRACHmuitipie offset if one or more RACH procedures are to be performed on the secondary component carrier, the second offset P0_PRACHmultiple having a higher value than the first offset P0_PRACH.
In a further implementation, the mobile terminal determines the number of RACH procedures required based on a number of different time-advance groups to which said uplink component carriers to be time aligned belong.
According to another implementation of the invention, each of the one or more required RACH procedures is performed on uplink component carriers belonging to different time-advance groups among the uplink component carriers to be time aligned.
In a further embodiment, the identified number of required RACH procedures is equal to the number of different time-advance groups of the plurality of uplink component carriers to be time aligned.
Also, in another implementation, the uplink component carriers to be time aligned are uplink component carriers activated in the mobile terminal.
In a more detailed implementation, the time alignment of the uplink component carriers comprises setting a time-advance value per time-advance group.
According to another exemplary embodiment of the invention, the number of RACH procedures required corresponds to the number of time-advance groups to which the uplink component carriers to be time aligned belong, excluding those time-advance groups to which the uplink component carriers to be time-aligned belong. mobile terminal is already aligned in time.
Furthermore, it should also be noted that, of course, the different criteria and rules outlined above could be arbitrarily combined with each other to adjust the transmission power to be used by the mobile terminal for uplink transmissions.
According to another exemplary implementation of the invention in accordance with the first and second aspects of the invention, a mobile terminal for controlling transmission power for uplink transmissions, wherein the mobile terminal is configured with at least a first and a second carrier uplink component.
The mobile terminal comprises a processing unit for determining a transmit power required to transmit a PPUSCH transport block (i.) over a physical uplink shared channel on the first uplink component carrier, and for determining a transmit power required for transmit a PPRACH random access preamble (i) over a physical random access channel on the second uplink component carrier. Furthermore, the mobile terminal includes a power control unit to reduce the transmission power determined for transmission on the physical uplink shared channel and/or transmission on the physical random access channel according to a prioritization between the transmission power for transmitting the physical uplink shared channel and transmit power for transmitting the physical random access channel. The mobile terminal also has a transmitter for transmitting the transport block on the first uplink component carrier and the random access preamble on the second uplink component carrier within a transmission time slot i, using the respective transmit power.
According to a more detailed implementation of the invention, a mobile terminal further comprises a processing unit adapted to determine a transmission power required to transmit another random access preamble over a physical random access channel on a fourth uplink component carrier within of the transmission time slot i, and the transmit powers for transmitting each PPRACH random access preamble (I) are determined according to the corresponding uplink component carrier c, the uplink component carriers having an order of priority. The mobile terminal also has a power control unit adapted to reduce the determined transmission powers which additionally includes reducing the determined transmission powers to transmit each random access preamble Wc • PPRACHC (i) according to the order of priority, where Wc ε [0,...,1]; and wherein the transmitter is adapted to transmit each random access preamble using its reduced transmit power.
Another embodiment of the invention, in accordance with the second and third aspects of the invention, is to provide a mobile terminal for adjusting the transmission power used by a mobile terminal for one or more RACH procedures, the mobile terminal being allowed access to multiple carriers. uplink components. The mobile terminal includes means for determining, for uplink component carriers to be time aligned, the number of RACH procedures required to time align the uplink component carriers. The mobile terminal further comprises means for performing the determined number of RACH procedures required to time align the uplink component carriers, wherein a transmit power for all one or more RACH procedures is determined in accordance with the determined number of RACH procedures.
In accordance with another embodiment of the invention, a base station for use with the mobile terminal performing a method of adjusting transmission power to transmit random access preambles over physical random access channels on uplink component carriers is provided. The base station includes a power control unit configured to signal a P0_PRACHmultiple offset to the mobile terminal, wherein the P0_PRACHmultiple offset is used by the mobile terminal to determine a transmit power to transmit a random access preamble if the uplink component carrier to be time-aligned and the already time-aligned component carriers belong to more than one time-advancing group. The base station also has a receiving unit for receiving random access preambles on uplink component carriers with a transmit power that has been determined by the mobile terminal using the P0_PRACHmultiple offset.
In an exemplary detailed implementation, the base station further comprises a power control unit additionally configured to signal another PO_PRACH offset to the mobile terminal, wherein the PO_PRACH offset is used by the mobile terminal to determine a transmit power for a preamble of random access if the uplink component carrier to be time-aligned and the time-aligned component carriers belong to the same time-advance group. The base station also has a receiving unit for receiving random access preambles on the uplink component carriers with a transmit power that has been determined by the mobile terminal using the other PO_PRACH offset.
In a further exemplary embodiment of the invention, a base station for use with the mobile terminal performing a method of adjusting transmission power to transmit random access preambles over physical random access channels on uplink component carriers is provided. The base station includes a power control unit for signaling a base station dependent prescaling offset Δoffsetc for an uplink component carrier c a mobile terminal to be added by the mobile terminal to determine a transmit power for transmissions of random access preambles on the uplink component carrier. Additionally, the base station comprises a receiving unit for receiving random access preambles on the uplink component carrier with a transmit power that has been determined by the mobile terminal by adding the base station dependent prescaling offset Δoffsetc for the component carrier of uplink c.
Another exemplary embodiment of the invention in accordance with the first and second aspects of this invention relates to a computer readable medium storing instructions which, when executed by a processor of a mobile terminal, cause the mobile terminal to adjust the transmission power used. by the mobile terminal for uplink transmissions, wherein the mobile terminal is configured with at least a first and a second uplink component carrier, determining a transmit power required to transmit a PPUSCH(I) transport block over a shared channel of physical uplink on the first uplink component carrier, and determining a transmit power required to transmit a random access preamble PPRACH (I.) over a physical random access channel on the second uplink component carrier. Furthermore, the mobile terminal is forced to reduce the transmission power determined for the transmission of the physical uplink shared channel and/or the transmission of the physical random access channel according to a prioritization between the transmission power for the transmission of the channel. shared physical uplink and transmit power for transmitting the physical random access channel and transmitting the transport block on the first uplink component carrier and the random access preamble on the second uplink component carrier within a time slot of transmission i, using the respective transmission power.
In another embodiment of the invention, which is in accordance with the second and third aspects of the invention, execution of instructions on the computer-readable medium by the processor causes the mobile terminal to adjust the transmission power used for one or more transmission procedures. RACH, the mobile terminal being allowed access on multiple uplink component carriers, determining, for uplink component carriers to be time aligned, the number of RACH procedures required to time align the uplink component carriers. Execution of the instructions additionally causes the mobile terminal to perform the specified number of RACH procedures required to time align the uplink component carriers, wherein a transmit power for all one or more RACH procedures is determined according to the specified number of RACH procedures.
Another computer readable medium according to a further embodiment of the invention stores instructions which, when executed by a processor of a base station for use with the mobile terminal performing a method of adjusting transmission power to transmit random access preambles over physical random access channels on the uplink component carriers causes the base station to signal an offset P0_PRACHmultiple to the mobile terminal where the offset P0_PRACHmuitipie is used by the mobile terminal to determine a transmit power for a random access preamble if the component carrier of uplink to be time-aligned and the component carriers already time-aligned belong to the same forward group. Furthermore, the base station is made to receive random access preambles on the uplink component carriers with a transmit power that has been determined by the mobile terminal using the P0_PRACHmultiple offset.
An additional computer readable medium in accordance with another embodiment of the invention stores instructions which, when executed by a processor of a base station for use with a mobile terminal performing a method of adjusting transmission power to transmit random access preambles over physical random access channels on uplink component carriers, causes the base station to signal a base station dependent prescaling offset Δoffsetc for an uplink component carrier c a mobile terminal to be added by the mobile terminal to determine a transmit power for random access preamble transmissions on the uplink component carrier.
Executing the instructions additionally causes the base station to receive random access preambles on the uplink component carrier with a transmit power that has been determined by the mobile terminal by adding the base station dependent prescaling offset Δoffsetc to the component carrier of uplink. BRIEF DESCRIPTION OF THE FIGURES
In the following, the invention is described in more detail with reference to the accompanying figures and drawings. Similar or corresponding details in the figures are marked with the same reference numerals.
Figure 1 shows an exemplary architecture of a 3GPP LTE system,
Figure 2 shows an overview of the general E-UTRAN architecture of LTE,
Figure 3 and 4 show an exemplary localized allocation and an exemplary distributed allocation in uplink bandwidth in a single-carrier FDMA scheme,
Figures 5 and 6 show the Layer 2 structure of 3GPP LTE-A (Version 10) with carrier aggregation enabled for the downlink and for the uplink, respectively,
Figure 7 exemplifies the time alignment of an uplink component carrier relative to a downlink component carrier via a time advance as defined for 3GPP LTE (Version 8/9),
Figure 8 shows RACH procedures as defined for 3GPP LTE (Version 8/9) where contentions can occur, and
Figure 9 shows a contention-free RACH procedure as defined for 3GPP LTE (Version 8/9),
Figure 10 shows a flowchart of distributing a maximum available transmit power PMAX to transport blocks to be transmitted within a TTI according to an exemplary embodiment of the invention,
Figure 11 shows an exemplary situation in which a user equipment aggregates two radio cells, one radio cell originating from an eNodeB, and the other radio cell originating from a Frequency Selective Repeater (FSR),
Figure 12 shows an exemplary situation in which a user equipment aggregates two radio cells, one radio cell originating from an eNodeB, and the other radio cell originating from a Remote Radio Head (RRH),
Figure 13 exemplifies a different time alignment between a RACH transmission and a PUSCH transmission, assuming a time advance for the PUSCH transmission as defined for 3GPP LTE (Version 8/9),
Figure 14 exemplifies a RACH configuration of a user equipment configuration with multiple uplink component carriers, if the uplink component carriers belong to the same time advance group,
Figure 15 exemplifies a RACH configuration of a user equipment configuration with multiple uplink component carriers, if the uplink component carriers belong to two time advance groups,
Figure 16 shows a flowchart of a transmit power adjustment procedure to determine a transmit power for PRACH uplink transmissions.
and PUSCH according to another embodiment of the invention,
Figure 17 shows a flowchart of a transmit power adjustment procedure for multiple RACH procedures in accordance with another embodiment of the invention,
Figure 18 shows a flowchart of a transmit power adjustment procedure for multiple RACH procedures in accordance with an exemplary implementation of the Figure 17 embodiment of the invention. DETAILED DESCRIPTION OF THE INVENTION
The following paragraphs will describe various embodiments of the invention. For exemplary purposes only, most embodiments are outlined in relation to an orthogonal single carrier uplink radio access scheme in accordance with the LTE-A mobile communication system discussed in the Technical Background section above. It should be noted that the invention may be advantageously used, for example, in connection with a mobile communication system such as the previously described LTE-A communication system, however the invention is not limited to its use in this particular exemplary communication network. .
The explanations given in the Technical Background section above are intended to better understand the mostly LTE-A-specific exemplary embodiments described in this document and should not be construed as limiting the invention to the described specific implementations of processes and functions in the communication network. mobile. Nevertheless, the improvements proposed in this document can be readily applied to the architectures/systems described in the Technical Background section and may, in some embodiments of the invention, also make use of the standard and improved procedures of these architectures/systems.
The invention aims to provide efficient QoS control for uplink transmissions by a base station (eNodeB or Node B in 3GPP context) in a situation where a mobile terminal (user equipment in 3GPP context) is assigned multiple uplink resources in a transmission time interval (eg one or more sub-frames). The invention also provides an efficient use of the transmit power available to the mobile terminal for uplink transmissions in a TTI, even in cases where the mobile terminal is power limited.
A consideration underlying this invention is to introduce a priority order for the uplink resource assignments (respectively for the corresponding transport blocks). This order of priority is considered by the mobile terminal when generating transport blocks for uplink transmission and/or in distributing the transmission power available to the mobile terminal for uplink transmissions in a TTI to the respective transport blocks to be transmitted within the TTI . The order of priority is sometimes also called the order of processing. This is - as will become more apparent below - because the priority order defined for the uplink resource assignments (respectively for the transport blocks corresponding to them) is implying the order in which the uplink resource assignments (respectively for the corresponding transport blocks) are processed.
A first aspect of the invention is the prioritization of power application to individual transport blocks corresponding to multiple uplink resource assignments within power control. This aspect is particularly applicable to situations where the mobile terminal has limited power and guarantees an efficient distribution of the transmission power available to the different transport blocks. In accordance with this aspect of the invention, the processing order of uplink resource assignments (priority order) on the uplink component carriers is used to determine the power scaling for the power allocation of the individual transport blocks to be transmitted on the uplink component carriers. respective component carriers on the uplink. According to this aspect of the invention, a per-component carrier, respectively per-transport block or per-resource allocation, power scaling is applied.
In power-limited situations, the mobile terminal reduces the transmit power for transmitting each of the transport blocks according to the priority of the respective transport block given in the order of priority, so that the total transmit power used for transport block transmissions becomes less than or equal to the maximum transmit power available to the mobile terminal to transmit transport blocks on the uplink within a given TTI.
According to an exemplary implementation, transmit power scaling is reducing transmit power and is taking into account the priority of resource allocation of a respective transport block (or component carrier on which the respective transport block is to be transmitted ), as given by the order of priority in that transmission, transport blocks having the high priority should be the least affected by the transmission power reduction. Advantageously, the lower (higher) the priority of the resource allocation/component carrier according to the order of priority, the higher (lower) the power reduction applied to transmit power for the transport block required by its corresponding resource allocation.
As mentioned above, the power scaling can ideally be configured so that the transmission of high priority transport blocks should not be reduced where possible. Instead, reducing transmit power to meet the maximum transmit power available to the mobile terminal to transmit transport blocks on the uplink within a given TTI should first be attempted by limiting the transmit power of transmissions from the transport blocks of low priority.
Furthermore, in a more advanced implementation, the power control mechanism in the mobile terminal ensures that the control information to be signaled on a physical uplink control channel, such as the PUCCH in LTE-A, does not undergo power scaling. power but only transmissions on the physical uplink shared channel, ie transport blocks, transmitted concurrently with control information, such as the PUCCH in LTE-A, within the same TTI are subject to power scaling. In other words, the power control mechanism is designed to allocate the remainder of the difference between the transmit power available to the mobile terminal for uplink transmissions within a TTI and the transmit power required for signaling control information on the channel. physical uplink control is distributed on a per transport block basis to the transport blocks on the physical uplink shared channel taking into account the priority order of the transport blocks.
A second aspect of the invention is the prioritization of power allocation for simultaneous uplink transmissions over different physical channels (ie, there are multiple uplink transmissions within the same time slot). Examples for physical channels allowing uplink transmissions include the physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and the physical random access channel (PRACH). Prioritization of power allocation for uplink transmission over different physical channels allows for the allocation of individual transmission powers. This power allocation may be independent of the component carrier on which a respective uplink transmission is sent.
In accordance with this second aspect, different transmission power levels can be used for simultaneous uplink transmissions over a physical random access channel (PRACH) and over a shared physical uplink channel (PUSCH). Alternatively, the second aspect of the invention allows individually scaling the transmission power of simultaneous uplink transmissions over a physical random access channel (PRACH) and over a physical uplink control channel (PUCCH). Transmit power scaling for uplink transmissions based on a prioritization of physical channels can, for example, be used to improve the SINR of the respective uplink transmission over the prioritized physical channel. For example, a reduction in transmit power for uplink transmissions based on prioritization of physical channels may allow the mobile terminal to achieve a given power constraint if the mobile terminal is in a power limited situation.
In an exemplary embodiment of the invention which is in accordance with the second aspect of the invention, the transmit power for transmissions of the physical uplink shared channel (PUSCH) and/or the physical random access channel (PRACH) is reduced in accordance with a respective prioritization of the corresponding channels. In this context, transmit power for physical uplink shared channel (PUSCH) transmissions is prioritized over transmit power for physical random access channel (PRACH) transmissions or vice versa.
Advantageously, the lower (higher) the priority of physical channel transmission, the greater (lower) the power reduction applied to transmit power to transmit over the physical channel.
Ideally, to achieve a transmit power constraint in a power limited situation, a transmit power constraint for low priority physical channel transmissions can first be attempted, and then - if the transmit power constraint is not yet met - also the transmit power for higher priority physical channel transmissions may be limited.
In an alternative embodiment of the invention, prioritizing power allocation for simultaneous uplink transmissions over different physical channels can be advantageously combined with the first aspect of the invention of prioritizing power allocation for individual transport blocks corresponding to multiple resource assignments. uplink within the power control.
When user equipment is configured with multiple uplink component carriers belonging to more than one time-advance group, user equipment may be required to perform more than one RACH procedure to time align the respective uplink component carriers within of the same transmission time interval. In other words, user equipment may be required to transmit more than one random access preamble over the PRACH channel within the same TTI. Therefore, in a further more advanced embodiment of the invention, a prioritization of power allocation for transmitting the RACH preamble of the individual RACH procedures is performed, in case multiple PRACH procedures are to be performed simultaneously.
In a further alternative embodiment of the invention, the order of priority according to which the user equipment is determining the transmit power of RACH preambles for multiple RACH procedures is linked to the indices assigned to configured uplink component carriers. Each component carrier can be assigned a cell index or an individual carrier index (CI), and the priority order can be set according to the cell indices or carrier indices of the component carriers to which the uplink resources are assigned.
In an exemplary and more advanced implementation, eNodeB can assign the cell indices or the carrier indices, respectively, so that the higher/lower the priority of the component carriers, the higher/lower the cell index or the component carrier index. of the component carrier. In this case, the user equipment must determine the transmit power for transmissions of RACH preambles for multiple RACH procedures in descending carrier indicator order.
In a further alternative embodiment of the invention, the order of priority for determining transmit power for RACH preambles from multiple RACH procedures depends on the type of the component carrier. As described above, there is one primary uplink component carrier (PCC) configured per user equipment and potentially multiple secondary uplink component carriers (SCC). According to this embodiment, a user equipment always allocates transmit power for transmitting the RACH preamble that is part of a RACH procedure to the PCC, before allocating a transmit power of the RACH preamble of a RACH procedure. to be performed on any other uplink resource assignments within a TTI. Regarding transmit power assignments for RACH preambles of RACH procedures to be performed on SCC(s), there are several options. For example, the allocation of transmit power to perform RACH procedures on the SCC(s) may be left to the implementation of user equipment. Alternatively, the allocation of transmit power to perform RACH procedures on the SCC(s) may be handled in the order of the assigned cell indices or carrier indices.
A third aspect of the invention is to adjust the transmit power used to perform random access procedures (RACH) based on the number of RACH procedures required to time align multiple uplink component carriers. Depending on the number of uplink and component carriers that must be time aligned, a mobile terminal performs one or more RACH procedures to time align the uplink component carriers. A RACH procedure requires processing resources and introduces restrictions on the uplink transmissions that can be performed in parallel by a mobile terminal. It may therefore be desirable to perform as few RACH procedures as possible.
Adjusting the transmit power for the RACH preamble(s) based on the number of RACH procedures required can improve the probability of success of each of the required RACH procedures. Due to a higher probability of success of RACH procedures, the delay introduced by RACH procedures for uplink component carriers to be time aligned is reduced.
According to an exemplary embodiment of the invention, a user equipment could "reuse" the transmit power of one or more RACH procedures that are not required (i.e., that are superfluous and thus not performed) to adjust the power. to perform only the RACH procedures to time align the multiple component carriers improves the success probability of each of the required RACH procedures.
In an alternative embodiment of the invention, the user equipment increases the transmit power used to transmit the RACH preambles when multiple RACH procedures are required to time align the multiple uplink component carriers. For example, the user equipment uses a first offset PO_PRACH, if there is only one RACH procedure to be performed, and using a second and different offset P0_PRACHmuitipie if there is more than one RACH procedure to be performed. Advantageously, the second P0_PRACHmuitipie offset has a higher value than the first PO_PRACH offset, which can improve the probability of success when performing multiple RACH procedures.
In a further and alternative embodiment of the invention, user equipment can individually increase the transmit power used for RACH preambles in RACH procedures, depending on the type of component carrier on which a respective RACH procedure is performed. It can be assumed, for exemplary purposes, that there is a primary component carrier (PCC) configured per user equipment, and, optionally, one or more secondary component carriers (SCC). Therefore,
a user equipment would determine a transmit power for the preamble of a RACH procedure using a first PO PRACH offset, if the RACH procedure is to be performed at the PCC. User equipment would use a second and different Po_pRACHmuitipie offset if the RACH procedure is to be performed on a secondary component carrier. As previously noted, the second Po_PRAcHmuitipie offset can have a higher value than the first PO PRACH offset.
In an exemplary implementation of the third aspect of the invention, there are several options for determining (or limiting) the number of RACH procedures required for multiple uplink component carriers to be time aligned. For example, determining the number of RACH procedures required may be left to user equipment implementation. Another option or alternative is for the user equipment to determine the number of RACH procedures required based on the number of time-advance groups to which the multiple uplink component carriers belong. As described above, an eNodeB can group component carriers that experience a similar propagation delay into the same time-advance group. Since the propagation delay of all component carriers within a given time-advance group is equal, only a single time advance must be configured per time-advance group, which means that only one RACH procedure is required. required per time-advance group to align in time all the carriers that are components of it. Therefore, a user device obtaining information about the time-advance groups determines the number of RACH procedures needed to perform only one RACH procedure per time-advance group.
Considering a situation where one RACH procedure is required for each time-forward group to which at least one uplink component carrier to be time-aligned belongs, the number of RACH procedures needed is equal to the number of different forward groups in the time of the plurality of uplink component carriers to be time aligned.
A user device can define the time advance of each of the one or more uplink component carriers to be time aligned and belong to a time advance group using a time advance value obtained from the eNodeB after performing a single RACH procedure for one of the uplink component carriers to be time aligned of the respective time-advance group.
Considering for exemplary purposes that user equipment is configured with uplink component carriers that are already aligned in time (for example, a RACH procedure was performed at an earlier point in time), an additional RACH procedure to acquire a value of time-advance does not need to be performed for those time-advance groups for which a time-advance value is already set, that is, for those time-advance groups that comprise one of the already time-aligned uplink component carriers. Therefore, the number of RACH required corresponds to the number of time-advance groups for which there is no time-advance value configured, or in other words, the number of RACH procedures is equal to the number of time-advance groups not set. comprising a time-aligned uplink component carrier. Regarding the component carriers to be time-aligned and belonging to a time-advance group for which a time advance is already configured, the user equipment simply configures the time advance of each of the uplink component carriers of according to the time advance defined for the respective time advance group to which the respective component carrier belongs.
As already indicated above, one aspect of the invention is the distribution of transmit power to the transmissions of transport blocks generated in the resources allocated on the uplink component carriers. In this context, situations where the mobile terminal has limited power are of particular interest. When implementing the invention in a communication system using uplink carrier aggregation, such as LTE-A, and assuming a power control per component carrier, another realization of the invention is to propose the prioritization of transmission power allocation on the uplink shared channel. physical to the uplink component carriers for cases where the mobile terminal is in a power limited situation. This proposed prioritization of the transmission power available to the mobile terminal is capable of addressing the different QoS of the uplink component data/carriers.
Power limiting denotes the situation where the total transmit power of the mobile terminal that would be required to transmit the transport blocks on uplink component carriers within a single TTO according to the uplink resource allocations is exceeding the maximum power of transmission available to the mobile terminal for PMAX uplink transmissions. The maximum transmit power available to the mobile terminal for PMAX uplink transmissions, therefore, depends on the maximum power capabilities of the mobile terminal and the maximum transmit power allowed by the network (ie configured by the eNodeB).
Figure 10 shows a flowchart of distributing a maximum available transmit power PMAX to transport blocks to be transmitted within a TTI according to an exemplary embodiment of the invention. In this exemplary embodiment and in the following examples below, an LTE-A based communication system using uplink carrier aggregation, and assuming a power control per component carrier will be assumed. Furthermore, it is also assumed that the transmit power of the PUCCH (i.e., the control information) is prioritized over the PUSCH transmissions (i.e., the transport blocks generated according to the uplink resource assignments(, i.e. that is, the transmit power of PUSCH is scaled first in a power limited situation.
The mobile terminal first receives 1001 multiple assignments of uplink resources to a TTi using its receiving unit, and a processing unit of the mobile terminal determines 1002 their order of priority. The priority order of uplink resource assignments can be determined according to one of several exemplary options discussed in this document.
In addition, the transport block generation unit of the mobile terminal generates 1003 transport blocks according to the uplink resource assignments. This transport block generation can be re-implemented according to one of several exemplary options outlined in this document. Also, in another alternative implementation, the transport block for each component carrier can be generated according to the corresponding uplink resource allocation by performing logical channel prioritization known from LTE Ver. 8 for each uplink resource allocation respectively additionally determines 1004 for each of the generated transport blocks the transmission power that would be required/implicated by their respective uplink resource allocations according to power control, i.e. the Required transmit power is given by the power control formula. For example, the mobile terminal may use formula (1) as provided in this document in the Technical Background section to determine the transmit power that would be implied for the transmission of each of the transport blocks on the uplink component carriers by resource allocation. corresponding uplink. In this example, the mobile terminal is considered to be power-limited for the transmissions of transport blocks within the TTI data. The mobile terminal can, for example, determine its power limitation by comparing the sum of transmit power required for transport blocks to the maximum transmit power available to the mobile terminal for PMAX uplink transmissions minus the transmit power required for signaling control on the PUCCH PPUCCH on the same TTI, and thereby determine that the sum of the transmit power required for the transport blocks exceeds the maximum transmit power available to the mobile terminal for PMAX uplink transmissions minus the transmit power required for the control signaling on the PUCCH PPUCCH on the same TTI.
In order not to exceed the maximum transmit power available to the mobile terminal for PMAX uplink transmissions minus the transmit power required for control signaling on the PUCCH PPUCCH on the same TTI, the mobile terminal needs to reduce the uplink transmit power for the transmission of all or some of the transport blocks. There are several options for how this power reduction, also called power scaling, can be implemented. In the exemplary flowchart shown in Figure 10, the mobile terminal then determines 1005 a power reduction for each transmission of a transport block, so that the sum of the reduced transmission power for each transmission of the transport blocks (i.e., the transmit power obtained for each respective transmission of a transport block by applying 1006 to a given respective power reduction to the respective required transmit power as determined in step 1004) becomes equal to, or less than, the maximum transmit power available to the terminal for PMAX uplink transmissions minus the transmit power required for control signaling on the PUCCH PPUCCH on the same TTI. The mobile terminal transmit power control unit applies 1006 the respective determined power reduction to the respective transmit power as determined in step 1004 and transmits 1007 the transport blocks on the assigned uplink resources on the component carriers within the TTI data using the reduced transmission power.
Power derating or power scaling can be implemented as part of a transmit power control functionality provided by the mobile terminal. The power control functionality can be considered as a function of the physical layer of the mobile terminal. It can be assumed that the physical layer has no idea of the logical channel mapping to the transport block, respectively the logical channel mapping to the component carrier, since the MAC layer of the mobile terminal performs the multiplexing of the logical channel data to multiple component carriers. However, it is desirable that the power scaling of the transmissions of the transport blocks (i.e., of the PUSCH) based on uplink component carrier priority (respectively, the priority of the uplink resource allocations by assigning resources to them) be able to adequately support delay-sensitive traffic in a carrier aggregation configuration.
More particularly, it is desirable that the high QoS data within the transport blocks transmitted in the PUSCH be smaller in size compared to the low QoS data which can tolerate more retransmissions. Therefore, according to an exemplary embodiment of the invention, the power scaling of the transmissions of the transport blocks in the PUSCH (see steps 1005 and 1006) advantageously considers the processing order of the uplink resource assignments, which can be considered equivalent to the priority order of the component carriers to which they assign resources. Since both the processing order of uplink resource assignments and power scaling have an impact on the quality of transmission through which the logical channels pass, it is desirable to have some interaction between prioritizing uplink resource assignments in generating transport block in the MAC layer of the mobile terminal (see, for example, step 1003) and the power scaling functionality in the physical layer of the mobile terminal (see steps 1005 and 1006).
This interaction can, for example, be achieved by the power scaling function provided at the physical layer using the same order of priority of uplink resource assignments for power scaling of PUSCG transmissions as used in the MAC layer to determine the processing order. of uplink resource assignments in the generation of transport blocks. In an exemplary implementation, the mobile terminal reduces the necessary transmit powers (see step 1004) for the transport blocks in the PUSCH in the reverse processing order of the uplink resource assignments. Basically, the mobile terminal power control unit starts to reduce the transmit power required for the transmission of the corresponding transport block by assigning lower priority uplink resources first, then the terminal power control unit reduces the power transmission required for the transmission of the transport block corresponding to the allocation of second-lowest uplink resources, etc. If necessary, the transmit power of the one or more transport blocks can be reduced to zero, that is, the mobile terminal performs DTX on the given carrier(s) component(s).
In an additional exemplary implementation, the transmit power required for one transport block transmission is reduced to zero, before scaling the power of the next transport block. Thus, the control unit starts to reduce the transmit power required for transmitting the transport block corresponding to the allocation of lower priority uplink resources down to zero (if necessary), and if the transmit power needs to be further reduced, the terminal power control unit reduces the transmit power required for transmitting the corresponding transport block by assigning second lowest priority uplink resources again to zero (if necessary), etc.
Power derating/scaling of transmit power can, for example, be implemented as it occurs in an LTE-A system. In an exemplary implementation, the eNodeB signals a weight factor Wc for each component carrier c to user equipment that is applied to the PUSCH transmission of a transport block on the respective component carrier. When user equipment is power limited, its power control unit scales the weighted sum of transmit power for all PUSCH transmissions on the component carriers to which resources have been assigned. This can be accomplished by calculating a scaling factor s such that the maximum transmit power available to the mobile terminal for PMAX uplink transmissions is not exceeded. Sizing factors can be determined from formula (2):
where s denotes the scaling factor and Wc the weight factor for the c component carrier. PPUCCH(í) denotes the transmit power required for control signaling on the PUCCH within the TTI i, and PPUCCHC (i) denotes the transmit power of a transport block to be transmitted on the PUSCH of the component carrier c within the TTI i (see step 1004 and formula (1)). Apparently, the sizing factors can be determined as follows:

The weight factor Wc of the component carriers can, for example, consider the QoS of the data transmitted on a specific component carrier.
In a more advanced implementation, it can be guaranteed that the transport block transmitted in the PUSCH of the uplink PCC is not scaled. This can be, for example, performed by the eNodeB by setting the weight factor Wc for the uplink PCC at 1/s. Alternatively, the following relationship can be used to determine the scaling factor s only for component carriers other than the uplink PCC:
so that:
where PPUSCH_PCC (i) is the transmit power required for transmitting the transport block to be transmitted on the uplink PCC (see step 1004 and formula (1)), while PPUSCH_SCCC (i) is the transmit power required for transmitting of the transport block to be transmitted on the other uplink SCCs (see step 1004 and formula (1)).
In a further exemplary embodiment of the invention, when generating the transport blocks, the user equipment can process the uplink resource assignments in descending order of weight factors Wc. Thus, the order of priority can be given by the weight factors Wc. The mobile terminal may begin processing by allocating uplink resources to an uplink component carrier that is assigned the highest priority weight factor WC. Essentially, the highest WC weight factor corresponds to the highest priority uplink component carrier, respectively, the highest uplink resource allocation in this realization.
If the same WC weight factor is applied to multiple uplink component carriers, the processing order may be left to implementation by the user equipment. Alternatively, in the case of equal WC weight factor, the processing order can also be determined based on the downlink transmission timing of the uplink resource assignments (as discussed above) or based on the carrier index (CI) of the carriers. corresponding components.
In another exemplary embodiment of the invention, the power scaling by the mobile terminal power control unit depends on the type of component carrier on which the respective transport block is to be transmitted. Allocating power to the PUSCH transmission of a transport block on the uplink PCC that carries high-priority traffic is prioritized over other PUSCH transmissions on the uplink SCC(s). The power allocation, respectively, the amount of power reduction/scaling of other uplink component carriers, ie uplink SCC(s), can be left to implementation by the user equipment. For example, with respect to the remaining SCC(s), the user equipment could multiplex QoS sensitive data onto a component carrier of its choice and is allowed to prioritize the power allocation of this component carrier over other SCC(s) of its choice. uplink.
In a communication system using carrier aggregation, mobile terminals may also be allowed to perform random access on a component carrier, while transmitting scheduled data (transport blocks) on other component carriers. For a 3GPP based system such as LTE-A, it may thus be possible for user equipment to be performing random access channel (RACH) access on a component carrier, while transmitting on PUSCH/PUCCH simultaneously on other carriers. components. The user equipment can thus transmit a RACH preamble, i.e. a transmission on the physical random access channel (PRACH) and, on the same TTI, also transmit data on the PUSCH and/or the PUCCH. A potential use case for concurrent PRACH and PUCCH/PUSCH transmission is the situation where user equipment is out of sync on one uplink component carrier, while still uplink in sync on another uplink component carrier. To recover the uplink sync for the “component carrier out of sync”, the user equipment would perform a RACH access, eg requested by PDCCH. Furthermore, also in cases where no dedicated scheduling request channel is configured for a user equipment in the PUCCH, the user equipment can perform a RACH access to request uplink resources if new data arrives in the UE buffer.
In these cases, according to another embodiment of the invention, the transmit power for the RACH access (i.e., the transmission of the RACH preamble in the PRACH) is not subject to power control by the access network. Nevertheless, in this embodiment, transmit power for PRACH transmission is considered when power scaling is applied by the mobile terminal in power limited situations. Thus, in the case of a concurrent PRACH transmission and a concurrent PUCCH/PUSCH transmission, the transmission powers for the PRACH, the PUSCH and the PUCCH within a TTI must satisfy the relationship:
where PPRACH (i) is the transmit power for the transmission in the PRACH in the TTI i, while, if power scaling is necessary due to power limitation, the following relationship may be in an exemplary situation to be achieved:

In a more detailed exemplary implementation, the initial preamble transmit power setting (i.e., the PPRACH(i) setting) may be based on an open-loop estimate of the user equipment with full path loss compensation. This can ensure that the received power of RACH preambles is path loss dependent. The eNodeB can also configure an initial power offset for the PRACH, depending on, for example, the desired received SINR, the measured uplink interference, and the noise level in the time-frequency slots allocated to RACH preambles, and possibly on the format of the preamble. In addition, the eNodeB can optionally configure the preamble power increment, so that the transmit power PPRACH(Í) for each retransmitted preamble, i.e., if the PRACH transmission attempt was not successful, is incremented by a fixed step.
There are different alternatives for power scaling in the case of concurrent PRACH and PUCCH/PUSCH transmissions. One option is for the transmit power of PRACH PPRACH(Í) to be prioritized over the transmit power of PUSCH
similar to the transmit power of PUCCH PPUCCH(I). This option is shown in link (7) above.
Alternatively, another option is to prioritize PUCCH/PUSCH transmissions over PRACH transmissions. In this case, the user equipment would first reduce the transmit power PPRACH(I) of the PRACH and then subsequently reduce the transmit power
of the PUSCH (if necessary).
In a third option, no concurrent transmission of PRACH and PUCCH/PUSCH is allowed. So, in this case, the user equipment discards the PUCCH/PUSCH transmission or the PRACH transmission. time shift is different between PRACH and PUCCH/PUSCH, full utilization of the Power Amplifier (PA - “Power Amplifier”) is quite difficult.
In other words, a prioritization between transmit power for a PUSCH transmission and a transmit power for the PRACH transmission (that is, the transmission of a RACH preamble) defines how a user equipment performs power control when transmits on different physical channels within the same transmission time interval.
According to one embodiment of the invention, a user equipment uses different transmission power levels for simultaneous uplink transmissions through a PRACH and through a PUSCH. By using different power levels, user equipment can reach a given power constraint, as will be exemplarily illustrated below with reference to the flowchart in Figure 16.
To adjust the transmit power used by a user equipment for uplink transmissions, the user equipment first determines a priority for PRACH and PUSCH transmissions (see step 1601). Furthermore, the user equipment determines the transmit power for the PUSCH transmission (see step 1602) and for the PRACH transmission (see step 1603) to be performed in the same transmission time slot. In particular, these power levels can be determined based on the uplink component carrier on which each of the transmissions is to be performed. It should be apparent that a transmission of PRACH and PUSCH that must occur in the same sub-frame must be performed on different uplink component carriers (ie, by a user equipment that supports carrier aggregation). This user equipment may be an LTE-A user equipment. Then, the user equipment reduces the transmit power determined for the PUSCH transmission and/or for the PRACH transmission (see step 1604). This power reduction is performed according to a prioritization between the transmit power for the PUSCH transmission and the transmit power for the PRACH transmission. By reducing the transmit power according to the maximum available transmit power of the user equipment, the user equipment can be adapted to meet a given power constraint in a limited power situation. The user equipment then applies the given power reduction to the determined PRACH and PUSCH transmit power (see step 1605) and transmits the PRACH and PUSCH transmission at the reduced transmit power on the respective uplink component carrier (see step 1606).
A user equipment supporting carrier aggregation can simultaneously perform a RACH access while transmitting in PUSCH/PUCCH on other component carriers. In other words, a user equipment may encounter situations where it transmits a RACH preamble, that is, a PRACH transmission, and, in the same TTI, also transmits in PUSCH and/or PUCCH. Simultaneous PRACH and PUCCH/PUSCH transmissions can, for example, occur in a situation where user equipment is out of uplink sync on an uplink component carrier, while still uplink sync on another uplink component carrier . To recover uplink synchronization, the user equipment performs a RACH access, for example, a contention-free RACH access, requested by a PDCCH for the component carrier that is out of sync. In addition, when there is no dedicated scheduling request channel configured for a user device in the PUCCH, the user device can also initiate a RACH access to request the uplink resource, for example, if new data arrives in the device's buffer. of user.
In LTE, uplink power control, as described in the Technical Background section of this document, is defined for the physical uplink shared channel (PUSCH), the physical uplink control channel (PUCCH), and the audible reference signals. (SRSs - “Sounding Reference Signals”) giving the impression that it is not applied to the shared physical uplink channel (PRACH). Nevertheless, it is necessary to consider PRACH transmission when power scaling needs to be used due to power limitations.
Conventionally, only PUCCH and PUSCH with multiplexed uplink control information (UCI) are considered for the case of power limitation, where higher priority is given to PUCCH than to PUSCH. A PUSCH transmission having multiplexed UCIs is considered to be of higher priority than a PUSCH transmission without multiplexed UCIs and is therefore prioritized. This generates the following order of priority: PUCCH > PUSCH, with UCI > PUSCH without UCI
In addition, the initial power configuration for transmitting a RACH preamble can be based on an open-loop estimate with full path loss compensation. This would ensure that the power received from the RACH preamble on the eNodeB is independent of path loss.
According to a more detailed embodiment of the invention, the eNodeB configures for RACH transmissions an additional power offset to be applied beyond the power determined by the conventional open loop power control mechanism. Exemplary implementations for determining power offset for RACH transmissions can be based on the desired received SINR, measured uplink interference, and noise level in the time-frequency slots allocated to RACH preambles, and preamble format.
According to another detailed embodiment of the invention, the eNodeB can reconfigure the preamble power increment so that the transmission for each retransmitted preamble, i.e. if the PRACH transmission attempt was not successful, is increased by one step fixed.
In other words, there are different solutions to implement the aspect of the invention to perform power scaling for the case of simultaneous PRACH and PUCCH/PUSCH transmission.
According to an implementation of the invention, PRACH transmit power is prioritized over PUSCH transmit power, similar to PUSCH transmit power. This generates the following order of priority: PUCCH > PRACH > PUSCH with UCI > PUSCH without UCI
A further implementation of the invention provides an additional advantage by prioritizing PUSCH with UCI multiplexed over a PRACH transmission. The PUSCH with multiplexed UCI includes viable urgent information. Therefore, a respective priority order can be implemented as follows: PUCCH > PUSCH with UCI > PRACH > PUSCH without UCI
In yet another implementation of the invention, PUCCH/PUSCH transmissions are prioritized over PRACH. In this case, the user equipment first reduces the transmit power for a PRACH transmission and then subsequently reduces the transmit power for a PUSCH transmission (if necessary). A priority order can be specified as follows: PUCCH > PUSCH with UCI > PUSCH without UCI > PRACH The above-described implementations of the invention are compatible with different user equipment configurations. For example, a user equipment can be configured with uplink component carriers belonging to more than one time advance (TA) group, where the user equipment has only one power amplifier (PA). Alternatively, the user equipment can be configured with multiple uplink component carriers belonging to more than one TA group, where, for each TA group of uplink component carriers, a separate power amplifier (PA) is provided.
In the exemplary configuration of a user equipment operating multiple uplink component carriers belonging to more than one TA group with only one power amplifier (PA), the user equipment must ensure that there are no concurrent transmissions of PRACH and PUCCH/PUSCH. An implementation of such user equipment would need to discard a PUCCH/PUSCH transmission or a PRACH transmission. This is due to the fact that the time shifts between the PRACH and the PUCCH/PUSCH are different and, similar to the case of HS-DPCCH and DPCCH/DPDCH of the HSUPA, a full utilization of the power amplifier (PA) is quite difficult. .
A further embodiment of the invention relates to the prioritization of multiple RACH transmissions within a TTI.
An implementation in accordance with the invention is a user equipment deciding which of the various RACH transmissions it should prioritize, based on an order according to the cell index of the corresponding uplink component carriers on which the PRACH preamble is to be transmitted. . In this implementation, the highest priority should be given to the PRACH transmission on the uplink component carrier with the lowest cell index.
Another implementation of the invention is a user equipment that distinguishes between RACH procedures initiated by the user equipment and RACH procedures that are requested by the eNodeB with a PDCCH order (also called RACH access contention book). In this implementation, RACH procedures requested by an eNodeB are given higher priority than those initiated by user equipment.
Also, both of the above mentioned implementations of priority schemes can be combined. In this case, the user equipment first classifies RACH procedures based on PDCCH order or UE initiation, and then classifies RACH procedures from both groups according to the cell index of the corresponding component carriers.
As previously indicated, it is another detailed embodiment of the invention to reconfigure the preamble power increment procedure performed by a user equipment so that transmission for each retransmitted preamble, i.e. in case the PRACH transmission attempt was not successful , is increased by a fixed step.
If the user equipment aggregates multiple uplink component carriers from more than a single TA group where multiple RACH procedures become necessary. An example might be a handoff, where user equipment needs to apply carrier aggregation with carriers enabled on the target eNodeB. In this case, part of the transmission procedure is to time align all TA groups with the activated component carriers. If this is done consecutively, this introduces additional delay, but concurrent RACH procedures increase the delay, as most likely the RACH opportunities on different uplinks in secondary cells will be set slightly apart from each other to allow the eNodeB to efficiently manage the RACH preamble resources and avoiding too many PRACH transmissions within a TTI.
Another situation where multiple (consecutive) RACh transmissions can occur is when a user equipment is scheduled to transmit data on several uplink component carriers belonging to different TA groups that are not time aligned (this may occur because of inactivity). over a longer period).
Also, in another exemplary situation, a user equipment may be asked to time-align a component carrier instantly upon activation. In this case, when a user equipment receives an activation command for several component carriers belonging to more than one TA group and these TA groups are not currently aligned in time, the user equipment needs to perform RACH procedures for all these groups. of AT simultaneously.
Therefore, according to an exemplary embodiment of the invention, user equipment may need to perform multiple RACH procedures simultaneously so that the additional delay that would be induced by performing RACH procedures consecutively is reduced. The objective is to address the delay time of a single RACH procedure, thus the delay caused by additional RACH procedures must be minimized.
According to an exemplary implementation, the user equipment increases a transmit power to perform the RACH preamble transmission in order to minimize the retransmission probability.
The PRACH power [dBm] is determined by a user equipment as follows:

To find the optimal power setting for PPRACH, a user equipment has several options as described below.
One implementation of the invention is to increase PO_PRACH when multiple uplink component carriers with PRACH opportunity are aggregated by user equipment. In this context, it may be advantageous if the eNodeB signals different values, for example a first offset value PO_PRACH and a second offset value P0_pRACHmuitipie, to the user equipment. The two offset values can be configured per user equipment. The first PO_PRACH offset value can be used when the user equipment only aggregates a component carrier with a PRACH opportunity. This would then be the primary cell.
The second P0_PRACHmuitipie offset has more power than the first PO_PRACH offset to increase the probability of succeeding with the initial PRACH transmission and reduce the delay that would be introduced if the PRACH had to be retransmitted. The second delay P0_pRACHmuitipie can be applied if the user equipment aggregates multiple component carriers, and multiple RACH procedures must be performed.
In this case, the user equipment determines the PRACH power [dBm] as:

In an alternative implementation to the Po_pRACHmuitipie offset signaling, a user device selects a higher predefined value (i.e., the next highest possible value for preamblelnitialReceivedTargetedPower as specified in section 6.2.2 3GPP TS 36.331, “Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); protocol specification”, version 10.0.0, available at http://www.3gpp.org and incorporated herein by reference. This may be the next value highest or a preset n to select the nth highest value.
In another exemplary embodiment, the value N in the above formula is adjusted so that N is already better suited to the current power and path loss situation than starting with an initial value of N = 1. If a procedure already existed of previous RACH on a component carrier, the user equipment reuses the last value of N that proved to be successful in the last RACH preamble transmission to perform the initial preamble transmission in the current RACH procedure on that component carrier, rather than use the initial value of 1. If there was no previous RACH procedure on that component carrier, the user equipment can start using the initial value of 1. This implementation can also be used when there is only a single component carrier that offers RACH opportunities .
A further exemplary embodiment of the invention considers selecting the value of N in a situation where the PRACH procedure on an uplink component carrier is the first PRACH procedure on that uplink component carrier, but the user equipment has already performed a PRACH procedure on another uplink component carrier. In case the user equipment must use the last successful value of N on another component carrier and apply it to determine the initial PRACH power for the component carrier with the initial RACH procedure.
Alternatively, since the user equipment always performs a first PRACH access on the primary component carrier (i.e., the primary cell, PCell), the user equipment can be configured to always refer to the N value of the last PRACH transmission. successful on the primary component carrier (PCell) for use as the initial value of N for another PRACH access on a different component carrier.
The use of N as described above can be beneficial in that no additional parameters need to be specified, and the user equipment still applies a simple rule to determine an improved transmit power setting to perform a PRACH procedure. Furthermore, when user equipment is implemented to utilize the value of N from the last successful PRACH transmission at the same component carrier power levels for each component carrier, each RACH opportunity can be individually adjusted by matching it to the implementation. different as previously presented, or presented below.
Another implementation according to a further embodiment of the invention may include adjusting the power level for the initial PRACH transmission by introducing an initial parameter Δoffset to be added to the original formula to determine the PRACH transmission power [dBm] as follows:

In this context, the value Δoffsetc can be individually configured by the eNodeB for each component carrier c with RACH opportunity. Therefore, eNodeB can control the initial RACH power to be performed by user equipment for each TA group separately. Alternatively, it may be advantageous to provide a first offset ΔoffsetPCELL for use with RACH procedures on the primary component carrier (PCell) and another ΔoffsetSCELL offset for RACH procedures on secondary cells (SCells). In addition, there is also the possibility of forming groups of component carriers with PRACH opportunity that use the Δoffset value that has been previously proven to be successful.
It is important to note that, unless otherwise noted, all implementations described above may also be used in combination.
As described above, a RACH procedure is started in the order of eNodeB (i.e., the eNodeB is sending a PDCCH containing a command for the UE to start the RACH procedure), for example, after data arrives at the user equipment that should be sent on the uplink when the uplink carrier is not aligned in time or during transfer.
According to another embodiment of the invention, a new trigger to start the RACH procedure allows for the reduction of the overall delay of RACH procedures, when multiple RACH procedures are possible on aggregated component carriers in a user equipment. This trigger is implemented as an activation command for a component carrier that belongs to a TA group that is not currently time aligned. Upon receipt of a MAC CE containing the activation command, a user equipment sends an acknowledgment (ACK) message on the uplink and waits for a pre-defined number of sub-frames (e.g. two sub-frames) before to initiate a RACH procedure. At this point in time, the eNodeB has received the ACK and inherently knows that a user device will initiate a RACH procedure. Consequently, the component carrier activation command as transmitted by the eNodeB can serve as a trigger to start the RACH procedure. In this way, the overall delay of the RACH procedures is reduced, saving the time of a PDCCH transmission that the eNodeB would have sent to the user equipment to request the RACH procedure. As a result, a RACH procedure can start earlier, and the delay is reduced.
In a further exemplary embodiment of the invention, the user equipment is configured to trigger by performing a RACH procedure for all currently unaligned TA groups upon the arrival of uplink data at the user equipment. Such a trigger to perform RACH procedures for all currently unaligned TA groups allows the eNodeB to quickly agent all uplink-enabled carriers on the user equipment.
An alternative embodiment of the invention suggests that a user equipment is configured to only perform RACH procedures on secondary component carriers (i.e., on component carriers other than the primary component carrier (PCell)) in response to a PDCCH request. In other words, user equipment is not allowed to perform a RACH procedure on a secondary component carrier (SCell) on its own accord. This can be advantageous as eNodeB has full control of RACH procedures on secondary component carriers (SCells) on a user equipment because eNodeB is able to determine an exact point in time and a component carrier on which the user initiates a RACH procedure.
As already indicated above, another aspect of the invention is the adjustment of transmit power for random access procedures (RACH) based on the number of RACH procedures required to time align multiple uplink component carriers.
Time-advance groups were introduced to uplink component carriers that experience a similar propagation delay. As a result, an eNodeB is allowed to control a time advance of all uplink component carriers belonging to the same group. For this purpose, the eNodeB could use a single RACH mechanism for early-time alignment, i.e., perform the Early-Time Forward Procedure, and, after that, subsequently send forward time-advance (TA) update commands via MAC control elements (MAC CEs).
Regarding the implementation of the correspondence between a MAC control element including the TA update command and the respective time-advance group (TA), there may be several options. For example, the correspondence between TA groups and MAC control elements including the TA update command could be left for implementation by the user equipment. Alternatively, an indicator could be provided within the MAC control element allowing the user equipment to identify the respective TA group of a received MAC control element comprising the TA update command. Yet another alternative would require the eNodeB to transmit the MAC control element including the TA command on at least one of the downlink component carriers belonging to a respective TA group.
However, even with the implementation of TA groups, the user equipment can be bound to restrictions resulting from the definition of the random access procedure (RACH). As already indicated above, a RACH procedure requires processing resources and introduces restrictions on the uplink transmissions that can be performed in parallel by a mobile terminal. In particular, restrictions on uplink transmissions that can be performed in parallel result from a different alignment in time between a PRACH uplink transmission (e.g., the random access preamble transmission in steps 801 and 902 as shown in Figures 8 and 9) and PUSCH transmissions as shown in Figure 13.
In more detail, PRACH transmissions and PUSCH and PUCCH transmissions that use different uplink time advance (PRACH) transmissions are always aligned to the downlink receive time, where the time advance (TA) is 0, while that PUSCH and PUCCH transmissions are only allowed on an uplink component carrier when the uplink component carrier is time aligned, where the time advance (TA) is greater than 0. Also, for PRACH transmissions, a different guard time duration is applied. Therefore, difficulties in regulating the overall transmit power and power fluctuations in transmit power can occur if the PUSCH/PUCCH transmissions and the PRACH transmissions must be transmitted simultaneously through the same power amplifier. Figure 13 illustrates an exemplary situation in which different timings are applied to PRACH and PUCCH/PUSCH transmissions.
To avoid misalignment causing power fluctuations, simultaneous uplink transmissions should be avoided on uplink component carriers with different time advance values through a power amplifier. An exemplary implementation of a user equipment that achieves the above constraint would have to ensure that all uplink transmissions through a power amplifier are on uplink component carriers belonging to the same time advance (TA) group, thus employing a same time-advance value which would therefore imply time-synchronous uplink transmissions. The exemplary user equipment implementation would also have to refrain from using this power amplifier for uplink transmissions on uplink component carriers with a different time advance.
Consequently, each time-advance (TA) group in a user equipment is assigned a separate “own” power amplifier.
This means that, in accordance with one embodiment of the invention, to time align one or more uplink component carriers, a required number of RACH procedures is performed, wherein a transmit power to perform all of the one or more RACH procedures is performed. RACH is determined according to the number of RACH procedures required.
Figure 17 shows a flowchart corresponding to this embodiment of the invention. As shown in Figure 17, a user equipment is configured with uplink component carriers to be time aligned. Prior to performing any RACH procedures, the user equipment determines (see step 1701) how many RACH procedures are required to utilize the provided number of power amplifiers to advantage, meeting the RACH restrictions described above. Assuming that the number of RACH procedures required is less than the number of uplink component carriers to be time-aligned, the user equipment saves energy and limits the use of processing resources.
Having determined the number of RACH procedures required, the user equipment determines a transmit power for RACH preambles of RACH procedures (see step 1702). After that, the user equipment performs the necessary RACH procedures on the determined transmit power to time align the uplink component carriers (see step 1703).
In an exemplary implementation, the user equipment determines a transmit power for the RACH preambles sent in the necessary RACH procedures by reusing the energy saved from step 1701. In more detail, dividing a total amount of available transmit power by a smaller number of RACH procedures needed (assuming that the number of RACH procedures needed is actually less than the number of uplink component carriers to be time aligned) allows user equipment to perform each RACH procedure with a transmit power larger.
According to an exemplary implementation, the user equipment determines the transmit power for all necessary RACH procedures by toggling between the PO_PRACH and P0_PRACHmuitipie offset. Using the first PO_PRACH offset when determining the transmit power to perform a RACH procedure if a RACH procedure is required, and using the second and larger P0_PRACHmuitipie offset value if multiple RACH procedures are required, allow the equipment to improve the probability of success when performing each RACH procedure and reduce the delay introduced by RACH procedures.
According to another exemplary implementation, the user equipment also determines the transmit power for all necessary RACH procedures by toggling between PO_PRACH and Po_pRACHmuitipie offsets. However, in this exemplary implementation, the user equipment uses the first PO_PRACH offset when determining the transmit power to perform a RACH procedure on the primary component carrier (PCell), and uses the second and larger P0_pRACHmuitipie offset value for RACH procedures on the secondary component carriers (SCells). As more than one secondary cell (SCell) can exist, an increase in transmit power to perform RACH procedures on secondary cells improves the probability of success and thus reduces the delay introduced by RACH procedures.
In a more detailed embodiment of the invention illustrated in Figure 18, the user equipment determines the number of RACH procedures required based on the number of TA groups to which the uplink component carriers belong and the TA groups with uplink component carriers. already aligned in time. First, the user equipment determines, to align one or more uplink component carriers, the number of TA groups to which the uplink component carriers belong (see step 1801). In this way, the user equipment can guarantee that at most one RACH procedure is performed for each TA group. If the user equipment is not time aligned with any uplink component carriers, the number of RACH procedures performed is equal to the number of TA groups to which the uplink component carriers belong.
Second, the user equipment excludes TA groups with uplink component carriers already aligned in time (see step 1802). In more detail, user equipment excludes from a list of TA groups (e.g. xreq TA groups) to which uplink component carriers belong those TA groups (e.g. xaiign) to which uplink component carriers already belong. aligned in time belong. In one implementation of this embodiment of the invention, a user equipment is configured to reuse the time-advance value of the already time-aligned uplink component carrier to time-align different uplink component carriers of the same TA group.
Third, the user equipment determines the number of RACH procedures required as the number of TA groups to which the uplink component carriers to be time aligned belong minus the number of TA groups to which the uplink component carriers belong. already time-aligned belong to m = xreq - xalign (see step 1803). Deleting the TA groups to which the time-aligned uplink component carrier belongs results in a number of required RACH procedures and a list of TA groups to which at least one of the uplink component carriers belongs and where the equipment Username does not have a time alignment. In other words, the number of RACH procedures required corresponds to the minimum number of RACH procedures to be performed to time align the uplink component carriers without making assumptions on pre-configured or correlated time advances for uplink component carriers.
Next, the user equipment determines a transmit power to perform the number of m RACH procedures needed (see step 1804). This step corresponds to step 1702 of Figure 17 and can be performed by the same implementations suggested in relation to Figure 17.
The user equipment then performs necessary RACH procedures on the determined transmit power to time align the uplink component carriers (see step 1703).
Considering the above restrictions, an advantageous implementation of the user equipment of the invention limits random access preamble transmissions to only one per time-forward group, so that only one PRACH preamble transmission is allowed for the uplink component carriers. belonging to the same time advance group. The choice of on which of the one or more uplink component carriers belonging to the same TA group the user equipment performs a RACH procedure can be configured by the eNodeB. Another alternative implementation may leave the uplink component carrier selection performing the RACH procedure for the user equipment, where the user equipment chooses one of the uplink component carriers belonging to a TA group to transmit PRACH preambles.
Figure 14 shows an exemplary configuration where a user equipment has aggregated five uplink component carriers among which four uplink component carriers are activated. All uplink component carriers belong to the same TA group, that is, they are subject to a similar propagation delay. In this exemplary configuration, a RACH procedure is performed on the first uplink component carrier (which may correspond to the primary/PCell component carrier). This exemplary configuration complies with carrier aggregation as described in Version 10 of the 3GPP standard.
Figure 15 shows an exemplary configuration where a user equipment aggregates uplink component carriers from different geographic locations (eg from an eNodeB and a Remote Radio Head) and different frequency bands. eNodeB provides uplink component carriers 1, 2, and 3 and groups uplink component carriers 1, 2, and 3 into time-forward group 1. Uplink component carriers 1, 2, and 3 experience a similar propagation delay . The Remote Radio Head provides uplink 4 and 5 component carriers in a different geographic position and in a different frequency band. These component carriers experience a different propagation delay compared to the first three component carriers. To respect these propagation delay differences, the uplink component carriers 4 and 5 are supplied with a different time advance and grouped into the time advance group 2.
Each of the time-advance groups 1 and 2 is associated with a different power amplifier to meet the restrictions in terms of allowed RACH procedures as described above.
In the time-forward group 1 with the primary component carrier / PCell, the RACH procedure is allowed on the primary component carrier / PCell and in the other time-forward group 2, any uplink component carrier could provide opportunities to send a preamble of CRACK Therefore, an exemplary implementation of the realization is for the user equipment to choose one of the uplink component carriers of the time-advance group on which the RACH procedures are performed. An alternative implementation of this realization adapts the eNodeB so that the eNodeB can configure on which of the uplink component carriers the user equipment performs the RACH procedures. In the exemplary configuration shown in Figure 15, uplink component carrier 4 is used by user equipment to perform RACH procedures.
In the above examples, a bandwidth aggregation situation was assumed, where the mobile terminal receives multiple assignments of uplink resources to different component carriers within the same TTI. The concept of introducing a priority, respectively order of priority, for uplink assignments can also be applied in the case of spatial multiplexing. Spatial multiplexing denotes a MIMO technique or a MIMO transmission mode, where more than one transport block can be transmitted at the same time on the same frequency using multiple receive and transmit antennas. The separation of the different transport blocks is performed by means of signal processing on the receiver and/or transmitter side. Essentially, the transport blocks are transmitted on different MIMO channels, respectively MIMO layers, but on the same component carrier.
Using spatial multiplexing - which is considered for the LTE-A uplink - uplink resource assignments allocate an uplink resource to MIMO layers on a component carrier. Thus, there can be multiple assignments of uplink resources to individual MIMO layers on a component carrier. Similar to the introduction of a priority order for component carriers, also for MIMO situations a priority or order of priority of the uplink resource assignments for the MIMO layers is used in the generation of transport blocks. The priority order of the MIMO layers can be preconfigured (eg, during radio bearer establishment) or can be signaled by physical layer, MAC, or RRC signaling, as mentioned previously.
Thus, assuming a single component carrier system - such as in LTE Ver. 8 - The uplink resource assignments for the individual MIMO layers of the component carrier could be rolled up into a virtual transport block and a joint logical channel procedure could be performed on the virtual transport block as described above. The contents of the transport block must then be divided into the transport blocks according to the priority order of their assignments, and the transport blocks are transmitted through the respective antennas of the mobile terminal.
Similarly, a parallelization of joint logical channel procedures is also possible, operating on transport blocks, respectively uplink resource assignments to MIMO layers instead of transport blocks, respectively uplink resource assignments to component carriers.
Furthermore, the concepts of the invention outlined in this document can also be used in systems that provide bandwidth aggregation (ie, multiple component carriers are configured) and spatial multiplexing. In this case, the uplink resource allocation grants an uplink resource to transmit a transport block on a given MIMO layer and component carrier. also for this system design, joint logical channel procedures can be used in a similar manner as discussed above.
In this context, please note that there may be a “joint” priority order for uplink resource assignments on a per MIMO layer and per component carrier basis, or alternatively, there may be separate priority orders, i.e., an order of priority for MIMO layers (independent of component carriers) and a priority order for component carriers (independent of component carriers). Third, there is also the possibility that spatial multiplexing is used, but the MIMO layers are supposed to have equal priority (so there is no priority order for MIMO layers), however, there is a priority order for MIMO layers. the component carriers.
In the first case, where there is a “joint” prioritization based on the MIMO layer and the component carrier, the logical channel prioritization procedures (pools) can be reused to generate the transport blocks for the individual component carriers and MIMO layers. .
In the second and third case, according to one embodiment of the invention, the uplink resource allocations of the MIMO layers are first accumulated (e.g. according to MIMO layer priorities, if available) per component carrier, and subsequently, the virtual transport blocks obtained on the component carriers are accumulated according to their order of priority to perform a logical (joint) channel prioritization on the virtual transport block obtained from the accumulation in terms of the component carrier.
By filling the virtual transport block obtained by accumulating in terms of component carrier with data from the logical channels, it is further divided into virtual transport blocks per component carrier, and subsequently the transport blocks per component carrier are further divided into individual transport blocks for the respective MIMO layers on each component carrier.
In a further embodiment of the invention, in the third case where there is no order of priority of the MIMO layers, there may be an uplink resource allocation sent per component carrier that covers all the MIMO layers. Therefore, in this case, the accumulation of uplink leases for the MIMO layers in this above procedure can be omitted. Nevertheless, the virtual transport blocks per component carrier obtained by division need to be further divided into transport blocks for the MIMO layers on each component carrier - for example, by allocating equal portions of the virtual transport blocks per component carrier to each layer of MIMO for streaming.
In some embodiment of the invention, the concepts of the invention have been described in relation to an improved 3GPP system, where there is a component carrier configured on the air interface. The concepts of the invention can also be applied equally to a 3GPP LTE-A (LTE-A) system currently discussed in 3GPP.
Another embodiment of the invention relates to the implementation of the various embodiments described above using hardware and software. It is recognized that the various embodiments of the invention can be implemented or realized using devices (processors). A computer device or processor may, for example, be general purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), Field Programmable Gate devices. Arrays (FPGA) or other programmable logic devices, etc. The various embodiments of the invention may also be realized or incorporated by a combination of these devices.
Furthermore, the various embodiments of the invention can also be implemented by means of software modules, which are executed by a processor or directly in hardware. A combination of software modules and hardware implementation is also possible. Software modules can be stored on any type of computer-readable storage medium, e.g. RAM memory, EPROM memory, EEPROM memory, flash memory, registers, hard disks, CD-ROM, DVD, etc.
It should further be noted that the individual features of the different embodiments of the invention may, individually or in arbitrary combination, be the subject of another invention.
It would be appreciated by one skilled in the art that various variations and/or modifications may be made to the present invention as shown in the specific embodiments, without departing from the spirit and scope of the invention as broadly described. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive.

权利要求:
Claims (28)
[0001]
1. TERMINAL DEVICE, characterized in that it comprises: a determination section configured to determine, for each substructure, the power for physical uplink shared channel (PUSCH) transmission on a first component carrier belonging to a first forward group (TAG), and to determine the power for transmitting a physical random access channel (PRACH) on a second component carrier belonging to a second TAG, the second TAG being different from the first TAG; an adjustment section, configured to adjust, when a total transmit power exceeds a maximum output power configured for the terminal apparatus PMAX>, the transmit power of PUSCH, so that the adjusted total transmit power does not exceed PMAX in one overlapping part of PUSCH transmission and PRACH transmission; and a transmission section configured to transmit a transport block along the PUSCH of the first component carrier at the power set for PUSCH transmission, and to transmit a random access preamble along the PRACH of the second component carrier at the power set for transmission of PRACH.
[0002]
2. TERMINAL DEVICE, according to claim 1, characterized in that, when transmitting the PUSCH simultaneously with a physical uplink control channel (PUCCH), the determination section still determines the power for the PUCCH transmission; and the adjustment section adjusts at least one of the PUSCH transmit power and the PUCCH transmit power.
[0003]
3. TERMINAL DEVICE, according to claim 2, characterized in that the adjustment section only adjusts the power for PUSCH transmission.
[0004]
4. TERMINAL DEVICE, according to claim 1, characterized in that the PRACH transmission is initiated by a PDCCH order.
[0005]
5. TERMINAL DEVICE, according to claim 1, characterized in that, when the transmission of the random access preamble is not requested and a physical uplink control channel (PUCCH) is transmitted simultaneously with the PUSCH, the determination section adjusts the power for transmission of PRACH to zero and further determines the power for transmission of PUCCH on the first component carrier; and the tuning section adjusts the transmit power of PUSCH so that the total transmit adjusted power does not exceed PMAX-.
[0006]
6. TERMINAL DEVICE, according to claim 1, characterized in that the adjustment section adjusts the power for PUSCH transmission by substructure.
[0007]
7. TERMINAL DEVICE according to claim 1, characterized in that when a plurality of PUSCHs are configured on the first component carrier, the adjustment section adjusts the power for transmitting PUSCHs by reducing the respective powers for the plurality of PUSCHs.
[0008]
8. TERMINAL DEVICE, according to claim 1, characterized in that the adjustment section adjusts the total transmission power in a priority order of PRACH, PUCCH and PUSCH.
[0009]
9. POWER ADJUSTMENT METHOD, characterized in that it comprises: determination, for each substructure, of power for physical uplink shared channel (PUSCH) transmission on a first component carrier, which belongs to a first timing advance group ( TAG), and determining the power for transmitting the physical random access channel (PRACH) on a second component carrier, which belongs to a second TAG, the second TAG being different from the first TAG; adjust, when a total transmit power exceeds a configured maximum output power for a PMAX terminal apparatus, of the transmit power of PUSCH so that the adjusted total transmit power does not exceed PMAX in an overlapping part of the transmit PUSCH and the transmitting the PRACH, and transmitting a transport block along the PUSCH of the first component carrier at the power set for transmitting PUSCH, and transmitting a random access preamble along the PRACH of the second component carrier at the power set for transmitting PRACH .
[0010]
10. POWER ADJUSTMENT METHOD, according to claim 9, wherein, when transmitting PUSCH simultaneously with a physical uplink control channel (PUCCH) on the first component carrier, the method being characterized by still comprising the determination of the power for PUCCH transmission; and setting at least one of the PUSCH transmit power and the PUCCH transmit power.
[0011]
11. POWER ADJUSTMENT METHOD, according to claim 10, characterized in that the adjustment is performed by adjusting only the power for PUSCH transmission.
[0012]
12. POWER ADJUSTMENT METHOD according to claim 9, characterized in that the PRACH transmission is initiated by a PDCCH order.
[0013]
13. POWER ADJUSTMENT METHOD, according to claim 9, in which, when the transmission of the random access preamble is not requested and a physical uplink control channel (PUCCH) is transmitted simultaneously to the PUSCH, the method being characterized for further comprising: setting the power for transmitting the PRACH to zero and determining the power for transmitting the PUCCH on the first component carrier; and power adjustment for transmit PUSCH so that the adjusted total transmit power does not exceed PMAX-
[0014]
14. POWER ADJUSTMENT METHOD, according to claim 9, characterized in that the adjustment is performed by adjusting the power for PUSCH transmission by substructure.
[0015]
15. POWER ADJUSTMENT METHOD according to claim 9, characterized in that when the plurality of PUSCHs are configured on the first component carrier, the adjustment includes adjusting the power for transmitting PUSCHs by reducing the respective powers for the plurality of PUSCHs. PUSCHs.
[0016]
16. POWER ADJUSTMENT METHOD, according to claim 9, characterized in that the adjustment is performed by adjusting the total transmission power in a priority order of PRACH, PUCCH and PUSCH.
[0017]
17. COMMUNICATION APPARATUS, characterized in that it comprises: a receiving section configured to receive a transport block transmitted in power for physical uplink shared channel (PUSCH) transmission along the PUSCH of a first component carrier belonging to a first group timing advance (TAG), and to receive a random access preamble transmitted in the physical random access channel (PRACH) transmission power along the PRACH of a second component carrier belonging to a second TAG, the second TAG being different from the first TAG, where the power for transmitting PUSCH is determined for each sub-frame in a terminal apparatus, and when a total transmit power exceeds a maximum output power configured for the terminal apparatus PMAX, the power for transmitting PUSCH is set in the terminal apparatus so that the adjusted total transmit power does not exceed PMAX in an overlapping part of the the transmission of PUSCH and the transmission of PRACH; and a transmission section configured to transmit a random access response in response to the random access preamble.
[0018]
18. COMMUNICATION DEVICE according to claim 17, characterized in that the receiving section still receives control information transmitted in power for a physical uplink control channel (PUCCH) transmission over the PUCCH of the first component carrier; and wherein the PUCCH transmit power is determined and at least one of the PUSCH transmit power and the PUCCH transmit power is set in the terminal apparatus.
[0019]
A COMMUNICATION DEVICE according to claim 17, characterized in that the PRACH transmission is initiated by a PDCCH command.
[0020]
20. COMMUNICATION DEVICE, according to claim 17, characterized in that the power for PUSCH transmission is adjusted by substructure.
[0021]
21. COMMUNICATION DEVICE, according to claim 17, characterized in that the total transmission power is adjusted in a priority order of PRACH, PUCCH and PUSCH.
[0022]
22. RECEPTION METHOD, characterized in that it comprises: receiving a transport block transmitted in power for physical uplink shared channel (PUSCH) transmission over PUSCH of a first component carrier belonging to a first timing advance group ( TAG), and receiving a power transmitted random access preamble for physical random access channel (PRACH) transmission over PRACH of a second component carrier belonging to a second TAG, the second TAG being different from the first TAG, wherein the PUSCH transmit power is determined for each subframe in a terminal apparatus, and when a total transmit power exceeds a configured maximum output power for the PMAX terminal apparatus, the PUSCH transmit power is adjusted in the apparatus terminal, so that the total transmit adjusted power does not exceed PMAX in an overlapping part of the PUSCH transmission and the d transmission. and PRACH; and transmitting a random access response in response to the random access preamble.
[0023]
23. RECEIVING METHOD, according to claim 22, characterized in that it further comprises: reception of power transmitted control information for a physical uplink control channel (PUCCH) transmission along the PUCCH of the first component carrier, wherein the power for transmitting PUCCH is determined and at least one of the power for transmitting PUSCH and the power for transmitting PUCCH is adjusted in the terminal apparatus.
[0024]
24. RECEIVE METHOD according to claim 22, characterized in that the PRACH transmission is initiated by a PDCCH order.
[0025]
25. RECEIVING METHOD, according to claim 22, characterized in that the power for transmitting PUSCH is adjusted by subframe.
[0026]
26. RECEPTION METHOD, according to claim 22, characterized in that the transmission power is adjusted in a priority order of PRACH, PUCCH and PUSCH.
[0027]
27. INTEGRATED CIRCUIT TO CONTROL A PROCESS, characterized by comprising: determination, for each substructure, of the power for transmission of physical uplink shared channel (PUSCH) on a first component carrier that belongs to a first timing advance group ( TAG), and determining the transmit power for physical random access channel (PRACH) on a second component carrier belonging to a second TAG, the second TAG being different from the first TAG, adjust, when a total transmit power exceeds a power maximum output configured for a PMAX terminal apparatus, of the power for transmitting PUSCH, so that the adjusted total transmit power does not exceed PMAX in an overlapping part of the PUSCH transmission and the PRACH transmission; and transmitting a transport block over the PUSCH of the first component carrier at the power set for PUSCH transmission, and transmitting a random access preamble over the PRACH of the second component carrier at the power set for PRACH transmission.
[0028]
28. INTEGRATED CIRCUIT FOR CONTROLLING A PROCESS, characterized in that it comprises: receiving a transport block transmitted in power for physical uplink shared channel (PUSCH) transmission over PUSCH of a first component carrier belonging to a first forward group (TAG), and reception of a power transmitted random access preamble for physical random access channel (PRACH) transmission along the PRACH of a second component carrier belonging to a second TAG, the second TAG being different from the first TAG, where the PUSCH transmit power is determined for each subframe in a terminal apparatus, and when a total transmit power exceeds a configured maximum output power for the PMAX terminal apparatus, the PUSCH transmit power is adjusted on the terminal apparatus so that the total transmit adjusted power does not exceed PMAX in an overlapping part of the transmission of PUSCH and the transmission of PRACH; and transmitting a random access response in response to the random access preamble.

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法律状态:
2020-05-12| B06F| Objections, documents and/or translations needed after an examination request according [chapter 6.6 patent gazette]|

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2020-05-19| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 52/32 , H04W 52/28 , H04W 52/34 , H04W 52/14 Ipc: H04W 52/14 (2009.01), H04W 52/34 (2009.01), H04W 5 |

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2020-05-26| B25A| Requested transfer of rights approved|Owner name: PANASONIC INTELLECTUAL PROPERTY CORPORATION OF AMERICA (US) |

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2020-06-02| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-06-16| B25A| Requested transfer of rights approved|Owner name: SUN PATENT TRUST (US) |

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2021-10-05| B06A| Patent application procedure suspended [chapter 6.1 patent gazette]|

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2021-10-13| B350| Update of information on the portal [chapter 15.35 patent gazette]|

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2021-11-30| B09A| Decision: intention to grant [chapter 9.1 patent gazette]|

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2022-02-01| B16A| Patent or certificate of addition of invention granted [chapter 16.1 patent gazette]|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 01/04/2011, OBSERVADAS AS CONDICOES LEGAIS. PATENTE CONCEDIDA CONFORME ADI 5.529/DF, QUE DETERMINA A ALTERACAO DO PRAZO DE CONCESSAO. |

优先权:

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申请号 | 申请日 | 专利标题

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EP09005727A|EP2244514A1|2009-04-23|2009-04-23|Logical channel prioritization procedure for generating multiple uplink transport blocks|

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EP09013642A|EP2244515A1|2009-04-23|2009-10-29|Logical channel prioritization procedure for generating multiple uplink transport blocks|

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EPPCT/EP2010/002119|2010-04-01|

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PCT/EP2010/002119|WO2010121708A1|2009-04-23|2010-04-01|Logical channel prioritization procedure for generating multiple uplink transport blocks|

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PCT/EP2011/001658|WO2011120716A1|2010-04-01|2011-04-01|Transmit power control for physical random access channels|

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