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    • 专利摘要:
    WIRELESS COMMUNICATION STATION, METHOD FOR EXCHANGING INFORMATION IN A WIRELESS COMMUNICATION SYSTEM, AND, MEDIA READABLE BY NON-TRANSIENT COMPUTER. A wireless communication system is disclosed that uses wireless base stations and other devices, such as a relay node, to interoperate using spectrum aggregation and MIMO. Traffic usage is detected and, based on channel usage in relation to capacity, spectrum aggregation is chosen over MIMO under certain conditions. On the other hand, under increased channel usage, system components switch to MIMO operating modes to reduce channel usage demand, while still providing good throughput for communications stations.
    公开号:BR112012005934A2
    申请号:R112012005934-3
    申请日:2010-06-18
    公开日:2020-07-28
    发明作者:Ryo Sawai
    申请人:Sony Corporation；
    IPC主号:
    专利说明:

    “WIRELESS COMMUNICATION STATION, METHOD FOR EXCHANGING INFORMATION IN A WIRELESS COMMUNICATION SYSTEM, AND, MEDIA READABLE BY NON-TRANSIENT COMPUTER”
    FIELD OF THE INVENTION The present invention relates to a communication system, a communication method, a base station and a communication device.
    BACKGROUND OF THE INVENTION A retransmission technique is standardized in IEEE (Institute of Electrical and Electronic Engineers) 802.16). Additionally, also in 3GPP (3rd Generation Partnership Project) LTE-A (Long Term Evolution - Advanced), a technique that uses a retransmission node (RN) is actively studied in order to improve the transfer rate of an equipment (UE) located at the edge of the cell.
    In addition, in LTE, base stations are operated using a frequency band with a bandwidth from 1 MHz to 20 MHz in relation to a certain central frequency. Thus, a communication device is not considered to use discrete channels. On the other hand, it is under consideration in LTE-A that the user equipment reserves a band of 20MHz or more for the aggregation of spectrum that makes simultaneous use of discrete or sequential channels to achieve a higher transfer rate. CITATION LIST
    PATENT LITERATURE [PTL 1] Publication of Non-Examined Japanese Patent Application2006-148388 The Publication of Unexamined Japanese Patent Application 2006-148388 (JP 2006-148388), attributable to the present inventor, and incorporated herein by reference in its entirety , discloses a radio communication device that includes a plurality of antennas and uses some antennas for reception processing, for example, as a first reception / transmission process and uses other antennas for transmission processing, for example, as a second reception process / streaming. —SUMMARY OF THE INVENTION
    TECHNICAL PROBLEM In order to treat dispersive channels by a "branch" of the receiver (an antenna, an analog processing unit etc., and sometimes referred to as a receiver "channel"), a filter or FFT compatible with a high bandwidth is required. In view of this, it is possible to simplify the configuration of each branch by applying the radio communication device disclosed in the above description JP 2006-148388 in the aggregation of spectrum and making different channels (communication channels) correspond to the respective branches (receiver branches).
    However, as recognized by the present inventor, the use of spectrum aggregation causes an increase in the number of channels allocated for communication with a communication device, which places a severe effort on resources, when compared to communication with multiple inputs and multiple outputs ( MIMO).
    In light of the above, it is desirable to provide a communication system, a base station and a communication device that are new and better and that enable the switching between the spectrum aggregation mode and the MIMO mode according to the observed traffic volume. - for a given channel capacity.
    BRIEF DESCRIPTION OF THE DRAWINGS The figure | it is an explanatory view showing a configuration of a communication system according to an embodiment of the present invention.
    Figure 2 is an explanatory view that shows an example of resource allocation in the case of using the same frequency in UL and DL.
    Figure 3 is an explanatory view showing an example of resource allocation in case of using different frequencies in UL and DL.
    Figure 4 is an explanatory view showing an example of a DL radio frame format.
    Figure 5 is an explanatory view showing an example of a UL radio frame format.
    Figure 6 is an explanatory view showing a Sequence - of connection processing.
    Figure 7 is an explanatory view showing an illustrative example of MBSFN transmission / reception processing.
    Figure 8 is an explanatory view showing an example of the frequency allocation in each cell.
    Figure 9 is a functional block diagram showing a configuration of user equipment in accordance with an embodiment of the present invention.
    Figure 10 is an explanatory view showing an illustrative example of channel grouping.
    Figure 11 is a functional block diagram showing a configuration of a base station in accordance with an embodiment of the present invention.
    Figure 12 is an explanatory view showing an example of the degree of congestion in a group of channels.
    Figure 13 is a sequence graph showing a flow for switching the transmit / receive mode.
    Figure 14 is an explanatory view showing an illustrative example of the multi-connection connection of a relay node. Figure 15 is an explanatory view showing an illustrative example of the multi-connection of the user equipment. Figure 16 is an explanatory view showing an example of a combination of Comp and spectrum aggregation. Figure 17 is an explanatory view showing typical transmission by a retransmission node. Figure 18 is an explanatory view showing an example of a combination of Comp and spectrum aggregation. Figure 19 is an explanatory view showing retransmission-type transmission by a retransmission node.
    DESCRIPTION OF THE MODALITIES In the following, modalities of the present invention will be described in detail in relation to the attached drawings. Note that, in this specification and the accompanying drawings, structural elements that have substantially the same function and structure are denoted with the same reference numbers, and repeated explanation of these structural elements is omitted. In addition, in this specification and in the drawings, each of a plurality of structural elements that have substantially the same function is distinguished by displaying a different alphabetical letter in the same reference number in some cases. For example, a plurality of structural elements that have substantially the same function are distinguished as user equipment 20A, 20B and 20C, when necessary. However, when there is no particular need to distinguish between a plurality of structural elements with the same function, they are denoted by the same reference number. For example, when there is no particular need to distinguish between user equipment 20A, 20B and 20C, they are referred to simply as user equipment 20. Modalities of the present invention will be described below in the following order.
    1. Basic Configuration of the Communication System (Example of Resource Allocation in Each Call) (Example of Radio Frame Format) (Connection Processing Sequence) 5 (MBSFN) (Example of Frequency Allocation in Each Cell)
    2. Illustrative Configuration of the Communication System 2-1. Switching between Spectrum Aggregation Mode and MIMO 2-2 Mode. Multilink Connection 2-3. Combination of Comp and Spectrum Aggregation <l. Basic Configuration of the Communication System> A basic configuration of a communication system 1 according to a modality of the present invention is described below in relation to the figures | up to 8. The figure | is an explanatory view that shows a configuration of the communication system | according to an embodiment of the present invention. With reference to figure 1, the communication system 1 according to the embodiment of the present invention includes base stations 10A and 10B, a backbone network 12, user equipment 20A, 20B and 20X and relay nodes 30A and 30B. The term "node" describes stations, devices, devices and equipment that relay a wireless signal from one device to another. Base station 10 manages communication between the relay node 30 and user equipment 20 located inside a cell formed by base station 10. For example, base station 10A manages scheduling information for communication with user equipment 20X located inside the cell, and communicates with the 20X user equipment according to the scheduling information. In addition, base station 10A manages scheduling information for communication with relay node 30A located inside the cell and scheduling information for communication between relay node 30A and user equipment 20A.
    Note that scheduling information management can be done cooperatively by base station 10 and relay node 30, it can be done cooperatively by base station 10, relay node 30 and user equipment 20, or it can be done by the relay node 30. The relay node 30 retransmits communication between the base station 10 and user equipment 20 according to the scheduling information managed by the base station 10. Specifically, the relay node 30 receives a signal transmitted from from base station 10 and transmit the amplified signal to user equipment 20 by using frequency / time according to scheduling information on the downlink.
    With such a retransmission at the retransmission node 30, a signal-to-noise ratio is higher compared to direct transmission of a signal from base station 10 to user equipment 20 near the edge of the cell.
    A more detailed explanation of the relay node and how it interoperates with a base station and user equipment is described in Patent Application JP 2010-040224, filed with the Japanese Patent Office on February 25, 2010, and JP 2010-040227 , filed at the Japanese Patent Office on February 25, 2010, whose full contents are hereby incorporated by reference.
    Also, also on the reverse link, the relay node 30 retransmits a signal transmitted from user equipment 20 to base station 10 according to the scheduling information managed by base station 10, thereby maintaining a high signal ratio per noise.
    Despite the case where only the relay node 30A exists in the cell formed by the base station 10A, a plurality of relay nodes 30 can exist in the cell formed by the base station 10A. Relay node types are proposed 30 o Type | and Type 2. The relay node 30 of Type | it has an individual cell ID and is allowed to manage its own cell. Thus, retransmission node 30 of Type | operates in such a way that it is recognized as the base station 10 by user equipment 20. However, relay node 30 of Type 1 does not operate completely autonomously, and relay node 30 performs relay communication in the resources allocated by base station 10.
    On the other hand, Type 2 relay node 30, unlike Type 1, does not have an individual cell ID and supports direct communication between base station 10 and user equipment 20. For example, a relay type transmission technique using cooperative relay or network encoding is being studied. To the following table | shows Type 1 and Type 2 characteristics under study. [Table 1] Item Type 1 Type 2 Decision R1 - 091098 R1- 091632 Retransmission Type L2eL3 L2 Retransmission PHY cell ID Cell ID itself No cell ID Transparency Relay node to EU relay node not transparent to transparent UE New cell Create new cell (one Do not create new another eNB) cell RF parameters Optimized parameters - N / A HO HO intercells (generic HO HO) transparently to the UE
    Channel Generation Generate channel Do not generate your Control timing, RS, own channel channel, but H-ARQ, decode / schedule information, etc. forward signal from donor eNB to UE Compatibility with Supports (appears as Supports (capable of a previous version of an eNB Rel-8 until UE also relays Rel-8) to UE Rel-8) LTE-A Supports (appears (Compatibility different from eNB with later version) Rel-8 to UE LTE-A) Knowledge of MS 9º (> eNB Rel-8 to * º UEs or LTE-A Retransmission) Cooperation Inter-cell cooperation Intra-cell cooperation Use of Higher Lower transfer by concentration Data usage model Coverage extension - Data rate improvement and coverage extension Higher Cost Lower User equipment 20 communicates with base station 10 directly or via relay node 30 according to managed scheduling information by base station 10. Data transmitted or received by user equipment 20 can be voice data, music data, such as music, lectures or radio programs, still image data, such as photographs, documents, figures or graphics, or video data, such as films, television programs, video programs, game images or the like. In addition, user equipment 20 can be an information processing device with a radio communication function, such as a cell phone or a personal computer (PO).
    A management server 16 is connected at each base station 10 via the backbone network 12. Management server 16 functions as a mobile management entity (MME). In addition, management server 16 can function as a server communication port. The management server 16 receives management information that indicates the state of the cell formed by each base station 10 from the respective base stations 10 and controls the communication in the cell formed by each base station 10 based on the management information. The role of the management server 16 can be incorporated into a plurality of physically separate structures in a distributed manner.
    (Example of Resource Allocation on Each Call) Resource allocation on each call is described below. In the following description, a communication path between the base station 10 and the relay node 30 is referred to as a relay link, a communication path between the relay node 30 and user equipment 20 is referred to as a connection link. access and a direct communication path between the base station 10 and user equipment 20 is referred to as a direct link. In addition, a communication path towards the base station 10 is referred to as UL (uplink) and a communication path towards the user equipment 20 is referred to as DL (downlink). Communication on each call is based on OFDMA.
    The relay node 30 separates the relay link and the access link by frequency or time in order to avoid interference between the relay link and the access link. For example, the retransmission node 30 can separate the retransmission link and the access link in the same direction by TDD (Time Division Duplexing) using a common frequency.
    Figure 2 is an explanatory view that shows an example of resource allocation in the case of using the same frequency in UL and DL. In relation to figure 2, a radio frame is made up of subframes O to 9.
    Additionally, in the example shown in Figure 2, the relay node 30 recognizes subframes 8 and 9 as resources for DL of the access link according to a direction from the base station 10 and therefore retransmits a signal transmitted from the base station 10 to user equipment 20 using subframes 8 and 9.
    Note that PSC (Primary Synchronism Channel) and SSC (Secondary Synchronism Channel), which are synchronous downlink signals, or PBCH (Physical Broadcast Channel) is allocated in subframes O and 5. Additionally, a radio call channel is allocated in subframes 1 and 6.
    Figure 3 is an explanatory view that shows an example of - resource allocation in case of using different frequencies in UL and DL. In relation to figure 3, a frequency fO is used for DL and a frequency fl is used for UL. In addition, in the example shown in figure 3, the relay node 30 recognizes subframes 6 to 8 of frequency fO as resources for DL of the access link according to a direction from the base station 10 and therefore retransmits a transmitted signal from base station 10 to user equipment 20 using subframes 6 to 8 of frequency fO.
    Note that PSC and SSC, which are downlink synchronous signals, are allocated in subframes O and 5 of the frequency fO (for DL), and a radio call channel is allocated in subframes 4 and 9. (Radio Frame Format Example ) Detailed examples of the frame format of the DL radio frame and the UL radio frame are described below in relation to figures 4 and 5. Figure 4 is an explanatory view showing an example of the shape of the DL radio frame. The DL radio frame consists of subframes O to 9, each subframe consists of two 0.5 ms intervals, and each 0.5 ms interval consists of seven OFDM symbols (Orthogonal Frequency Division Multiplexing).
    As shown in figure 4, a control channel, such as PCFICH (Physical Control Format Indicator Channel), PHICH (Physical Hybrid ARQ Indicator Channel) or PDCCH (Physical Downlink Control Channel), is present in the first to third OFDM symbols in the header of each subframe.
    Each of the exposed channels contains the following information as an example.
    PCFICH: The number of PDCCH symbols related to Layer 1 and Layer 2 PHICH: ACK / NACK for PUSCH PDCCH: Downlink control information. PDSCH / PUSCH scheduling information (format, such as modulation scheme or encoding rate) In addition, a resource block (IRB), which is a minimum resource allocation unit, consists of six or seven - OFDM symbols and 12 subcarriers. A demodulation reference (reference signal) is present in a part of the resource block.
    Additionally, SSC, PBCH and PSC are present in subframes O and 5. A free space in the radio frame shown in figure 4 is used as PDSCH (Physical Downlink Shared Channel).
    Figure 5 is an explanatory view showing an example of the UL radio frame format. Like the DL radio frame, the UL radio frame consists of subframes O to 9, each subframe consists of two 0.5 ms intervals and each 0.5 ms interval consists of seven - OFDM symbols.
    As shown in figure 5, a demodulation reference (reference signal) is present in each of the 0.5 ms intervals and a CQI measurement reference is present in a distributed manner. The base station 10 or the retransmission node 30 at the receiving end performs channel estimation by using the demodulation reference and demodulates a received signal according to the result of the channel estimate. In addition, the base station 10 or the retransmission node 30 at the receiving end measures the measurement reference CQI and thereby acquires CQI with the retransmission node 30 or the user equipment 20 at the transmission end.
    Additionally, a free space in the radio frame shown in figure 5 is used as PUSCH (Shared Physical Uplink Channel). Note that upon receipt of a request for a CQI report, user equipment 20 or relay node 30 transmits the CQI report using PUSCH.
    (Connection Processing Sequence) A connection processing sequence between relay node 30 or user equipment 20 and base station 10 is described below with reference to figure 6.
    Figure 6 is an explanatory view showing a sequence of connection processing. With reference to figure 6, the retransmission node or user equipment 20 transmits RACH preamble (Random Access Channel) to base station 10 (S62). Receiving the RACH preamble, base station 10 acquires TA (Synchrony Advance) information and transmits TA information together with resource information allocated to the relay node 30 or user equipment 20 (S64). For example, in the case where the transmission timing of the RACH preamble is known, the base station 10 can acquire a difference between the transmission timing and the reception timing from the RACH preamble as the TA information.
    After that, the retransmission node 30 or user equipment 20 transmits an RRC connection request to the base station 10 by using the resources indicated by the allocated resource information (S66). Upon receiving the RRC connection request, base station 10 transmits the RRC connection resolution which indicates a transmission source for the RRC connection request (S68). In this way, the relay node 30 or user equipment 20 can confirm that base station 10 has received the RRC connection request.
    Then, the base station 10 transmits the connection request which indicates that the relay node 30 or user equipment 20 is making a service request to the management server 16 which functions as MME (S70). Upon receiving the connection request, the management server 16 transmits the information to be defined to the relay node 30 or to the user equipment 20 as the connection configuration (S72).
    Then, base station 10 transmits the RRC connection configuration to the relay node 30 or user equipment 20 based on the connection configuration from management server 16 (S74), relay node 30 or user equipment 20 does the connection configuration. Thereafter, the retransmission node 30 or user equipment 20 transmits RRC connection completion indicating completion of connection configuration to base station 10 (S76).
    In this way, the connection between the relay node 30 or user equipment 20 and the base station 10 is completed, and communication becomes available. The aforementioned connection processing sequence is for illustration only, and the relay node 30 or user equipment 20 and base station 10 can be connected by another sequence.
    (MBSFN) In the following, MBSFN transmission (Single Frequency Multimedia Broadcast Network) which is performed by the base station 10 and an exemplary operation of the relay node 30 in response to the MBSFN transmission are described.
    MBSFN is the way in which a plurality of base stations 10 transmit data simultaneously in the manner of broadcasting on the same frequency. Therefore, in MBSFN, the Type 1 retransmission node 30 that operates virtually as a base station transmits a control channel to DL or the like using the same frequency as that of the base station 10. A specific flow of transmission / reception processing MBSFN is described below in relation to figure 7.
    Figure 7 is an explanatory view showing an illustrative example of MBSFN transmission / reception processing. First, as shown in figure 7, base station 10 and relay node 30 transmit PDCCH simultaneously. Base station 10 transmits, after PDCCH, PDSCH to user equipment 20 and R-PDCCH to control a retransmission. After R-PDCCH, base station 10 transmits PDSCH to retransmission node 30 (retransmission target data). A non-transmission period comes after the PDSCH for the retransmission node 30.
    The retransmission node 30 receives, after transmitting PDCCH, PDSCH (retransmission target data) from the base station 10 subsequent to a switching period to receive processing.
    Then, the relay node 30 switches reception processing to transmission processing in the non-transmission period that comes after PDSCH (relay target data) from base station 10. Additionally, in the next step, relay node 30 adds PDCCH in the decoded PDSCH (retransmission target data) and then transmits the data to user equipment 20.
    Thus, existing user equipment that does not consider the existence of the retransmission node 30 can take advantage of retransmission by the retransmission node 30 without confusion.
    (Example of Frequency Allocation in Each Cell) An example of frequency allocation in each cell in the case where a plurality of cells are adjacent is described below.
    Figure 8 is an explanatory view showing an example of the frequency allocation in each cell. In the case where each cell consists of three sectors, the frequencies fl to f3 are allocated to the respective sectors, as shown in figure 8, thereby suppressing the frequency interference at the cell boundary. Such allocation is particularly effective in a densely populated area with heavy traffic.
    In LTE-A, in order to achieve high end-to-end transfer rate, several new techniques, such as spectrum aggregation, networked MIMO, uplink multi-user MIMO and retransmission technique, are being studied. Therefore, with the advent of unprecedented high-throughput mobile applications, there is a possibility that depletion of frequency resources will also appear as a problem in a suburban area. Additionally, in the introduction of LTE-A, it is highly possible that the installation of the relay node 30 will be activated in order to achieve low cost infrastructure development.
    <2. Illustrative Communication System Configuration>
    The basic configuration of the communication system 1 according to the modality is described above in relation to figures 1 to 8. Below, an illustrative configuration of the communication system | according to the modality is described. (2-1. Switching Between Spectrum Aggregation Mode and MIMO Mode) Recently, it has been studied that a communication device (relay node 30 or user equipment 20) reserves a band of 20 MHz or more for aggregation spectrum that makes simultaneous use of discrete or sequential channels.
    However, in order to treat the dispersive channels by a branch (transmission / reception features, such as an antenna and an analog processing unit), a high bandwidth compatible filter or FFT is required.
    Additionally, the use of spectrum aggregation causes an increase in the number of channels allocated for communication with a communication device, which will increase a concern that a severe effort is placed on resources, when compared to MIMO communication.
    In relation to the exposed grounds, the communication system | according to a modality it was invented.
    According to the modality, it is possible to simplify the configuration of each branch of a communication device and selectively use the spectrum aggregation mode and the MIMO mode according to a traffic volume.
    Next, the user equipment 20 and the base station 10 that make up the communication system | according to the modality they are described in detail.
    In addition, more detailed explanations of the MIMO operation are provided in PCT International Publication WO 2004/030238 and in US Patent 6,862,271, the full contents of which are incorporated herein by reference.
    Figure 9 is a functional block diagram showing the configuration of user equipment 20 in accordance with the embodiment of the present invention. With reference to figure 9, user equipment 20 includes an analog processing unit 210, a digital processing unit 230, a control unit 242 and a channel selection unit 244. Analog processing unit 210 consists of a plurality of branches A, Be C.
    Each branch includes an antenna 220 and a signal processing unit, such as a BPF (Bandpass Filter) 222, an AGC (Automatic Gain Control) 224, a DC (Down Converter) / UC (Up Converter) 226 and a AD / DA 228. The respective branches (transmission / reception resources) can include not only elements in the analog processing unit 210, but also elements in the digital processing unit 230, such as FFT and IFFT.
    Antenna 220 receives a radio signal from base station 10 or relay node 30 and acquires a received high frequency electrical signal. In addition, antenna 220 transmits a radio signal to base station 10 or relay node 30 based on a high frequency transmission signal supplied from BPF 222.
    BPF 222 passes certain frequency components of a high frequency received signal acquired by antenna 220. Additionally, BPF 222 passes certain frequency components of a high frequency transmission signal supplied from AGC 224. AGC 224 controls automatic gain of a high frequency received signal supplied from the BPF 222 and a high frequency transmission signal supplied from the DC / UC 226.
    The DC / UC 226 performs a downward conversion of a signal received at high frequency supplied from the AGC 224 into a received baseband signal. In addition, the DC / UC 226 performs upward conversion to a transmission baseband signal supplied from the AD / DA 228 into a high frequency transmission signal.
    The AD / DA 228 converts a received baseband signal supplied from the DC / UC 226 from analog to digital. In addition, AD / DA 228 converts a transmission baseband signal supplied from digital processing unit 230 from digital to analog.
    The digital processing unit 230 includes an FFT that performs fast Fourier transformation into a received baseband signal supplied from each branch, a P (Parallel) / S (Serial), a demodulator, a decoder and the like as the elements for reception. In addition, the digital processing unit 230 includes an encoder, a modulator, an S / P, an IFFT and the like as the elements for transmission, and supplies a transmission baseband signal on which a subcarrier signal is superimposed, for example , to AD / DA 228. In addition, the digital processing unit 230 has a MIMO processing function that enables MIMO communication.
    The channel selection unit 244 selects channels (or group of channels) to be used for communication in spectrum aggregation mode. Inappropriate selection can cause a problem in the following Cases: - When a group of channels to be processed by a certain branch exceeds the limit of the branch's capacity; that is, when channels in the channel group to be processed are very dispersed.
    - When there is a big difference in the characteristics of the propagation path between channels in a group of channels to be processed by a certain branch and the expected improvement in the transfer rate is not achieved.
    Therefore, the channel selection unit 244 makes the channel selection by the following procedure: (1) Acquires information (usage channel information), such as the center frequency and the bandwidth of the respective channels used by the connected base station 10 ; (2) Determines resources (data rate) to be reserved for user equipment 20; (3) Classifies a plurality of channels used by the base station 10 as a group of channels; (4) Determines a combination of a group of channels and a branch.
    Specifically, in the above (3), the channel selection unit 244 classifies one or more of a channel that can be simultaneously - processed by each branch as a group according to a central frequency, a filter size, an FFT size definable or similar.
    For example, the channel selection unit 244 classifies channels into groups, in such a way that the bandwidth of each group does not exceed the bandwidth that can be handled by the FFT.
    Channel grouping is specifically described below in relation to figure 10. Figure 10 is an explanatory view showing an illustrative example of channel grouping.
    In the example shown in figure 10, base station 10 usage channels are O, P, Q, R, S, T, U and the like.
    In this case, channel selection unit 244 classifies channels O, P and Q as a group of channels # 1, classifies channels R, S and T as a group of channels # 2 and classifies channel U as a group of channels channels # 3, for example.
    Additionally, in relation to the above (4), each branch performs signal processing in known signals (for example, reference signals) of all channels transmitted from base station 10. Then, the channel selection unit 244 calculates the average communication quality, such as the level of reception or RIS of the channels that make up each group of channels, and thus acquire the quality of communication of each group of channels in relation to each branch.
    For example, channel selection unit 244 averages the communication quality of channels O, P and Q by branch A and thereby acquires the communication quality of channel group # 1.
    In addition, the channel selection unit 244 combines each branch and a group of channels with the highest quality of communication in each branch. For example, channel selection unit 244 combines branch A and channel group # 1, combines branch B and channel group # 2, and combines branch C and channel group # 3. Note that if a channel group has the highest quality of communication in different branches, the channel selection unit 244 - can combine the branch in which the communication quality of the channel group is highest and the channel group. In addition, channel selection unit 244 can combine the other branch and the channel group with the second highest quality of communication on the other branch.
    Again, in relation to figure 9, the configuration of user equipment 20 is further described below. The control unit 242 of user equipment 20 controls all operation on user equipment 20, such as transmission processing, receiving processing and connection processing, with relay node 30 or base station 10. For example, the control unit 242 performs TPC (Transmission Energy Control), CQI report transmission control or the like.
    In addition, control unit 242 requests that base station 10 use the channel group selected by channel selection unit 244 (i.e., the channel group combined with the branch). Although a request method is not particularly limited, exemplary methods are as follows: - Acquires channels for use by autonomously making a connection request for a given position (RACH: Random Access Channel) in relation to each of the selected channels. The connection request can be made from the branch combined with the channel.
    - Notify the selected channels for the use of a channel, not for each of the selected channels. A channel can be any of the selected channels or another channel. In addition, a channel can be transmitted from base station 10 via a broadcast channel, such as PBCH, or operational parameter information from an adjacent base station for transfer. In addition, the notification can be contained in any transmission signal (for example, RACH) in a connection processing sequence (call setup).
    Based on the exposed request, base station 10 allocates resources on channels on user equipment 20, and base station 10 and user equipment 20 can thus communicate in spectrum aggregation mode. For example, base station 10 can transmit radio signals by using channel groups # 1 through # 3, the user equipment performs reception processing of the radio signal using channel group # 1 by branch A, performs processing of reception of the radio signal using channel group 2 by branch B and performs reception processing of the radio signal using channel group 3 by branch C.
    20 Note that channel selection unit 244 and control unit 242 can carry out channel group selection and request for use from base station 10 as described above according to a command from base station 10. Additionally, the configuration of the user equipment 20 is also applicable to the relay node 30. Specifically, the relay node 30 can include a plurality of branches that transmit and receive signals, respectively, using different channels to thereby perform spectrum aggregation. At this time, the relay node 30 can select a group of channels with the appropriate communication quality and request that the base station 10 use the channel group selected by the method described above.
    Next, the configuration of the base station 10 is described in relation to figure 11. Figure 11 is a functional block diagram showing the configuration of the base station 10 according to the embodiment of the present invention.
    With reference to figure 11, the base station 10 includes an analog processing unit 110, a digital processing unit 130 and a control unit 142. In addition, analog processing unit 110 consists of a plurality of branches A, B and C .
    Each branch includes an antenna 120 and a signal processing unit, such as a BPF 122, an AGC 124, a DC / UC 126 and an AD / DA 128. The respective branches can include not only elements in the analog processing unit 110, but also elements in the digital processing unit 130, such as FFT and IFFT.
    In addition, although base station 10 includes three branches in the example shown in figure 11, the number of branches on base station 10 is not particularly limited.
    Antenna 120 receives a radio signal from user equipment 20 or relay node 30 and acquires a received high frequency electrical signal.
    In addition, antenna 120 transmits a radio signal to user equipment 20 or relay node 30 based on a high frequency transmission signal supplied from BPF 122. BPF 122 passes certain frequency components of a received signal in high frequency acquired by antenna 120. Additionally, BPF 122 passes certain frequency components of a high frequency transmission signal supplied from AGC 124. AGC 124 makes automatic gain control of a signal received in high frequency supplied to from BPF 122 and a high frequency transmission signal supplied from DC / UC 126.
    The DC / UC 126 performs a downward conversion of a signal received at high frequency supplied from the AGC 124 into a received baseband signal. In addition, the DC / UC 126 performs upward conversion to a transmission baseband signal supplied from the AD / DAl28emunm; high frequency transmission signal.
    The AD / DA 128 converts a received baseband signal supplied from the DC / UC 126 from analog to digital. In addition, AD / DA 128 converts a transmission baseband signal supplied from digital processing unit 130 from digital to analog.
    The digital processing unit 130 includes an FFT that performs fast Fourier transform into a received baseband signal supplied from each branch, a P / S, a demodulator, a decoder and the like as the elements for reception. In addition, the digital processing unit 130 includes an encoder, a modulator, an S / P, an IFFT and the like as the elements for transmission, and supplies a transmission baseband signal on which a subcarrier signal is superimposed, for example , to AD / DA 128. In addition, the digital processing unit 130 has a MIMO processing function that enables MIMO communication.
    Control unit 142 controls all communication in the cell formed by base station 10, such as transmission processing, reception processing, connection processing with relay node 30 or user equipment 20, and the management of information from scheduling. For example, when the use (connection) of a - plurality of channels is requested from relay node 30 or user equipment 20, control unit 142 can perform a sequence of connection processing with relay node 30 or with user equipment 20 and schedule a resource block on the channels requested on the relay node 30 or on user equipment 20. In this way, base station 10 can perform spectrum aggregation using a plurality of channels requested from from relay node 30 or user equipment 20. Note that in spectrum aggregation, control unit 142 can associate each of the channels - requested with any branch of base station 10 and communicate with relay node 30 or with user equipment 20 by using the associated branch.
    In addition, control unit 142 functions as a control unit so that it switches from spectrum-aggregation mode to MIMO mode according to the degree of congestion (traffic volume) of the channels that are used for spectrum aggregation. Mode switching is described hereinafter. More generally, when channel usage (eg traffic volume, SNIR level,% channel capacity, error rate, spectral occupancy, number of users, reserved, etc.) is detected as above a certain level, the control unit 142 switches to the MIMO operation mode.
    As a communication technique to improve throughput, MIMO is used in addition to spectrum aggregation. MIMO is a technique that transmits a plurality of signal sequences in parallel from a plurality of transmitting antennas, receives them with a plurality of receiving antennas and separates the plurality of signal sequences by using the independence of the path characteristics. propagation between the plurality of transmitting antennas and the plurality of receiving antennas.
    However, in MIMO, there is a case where the independence of the characteristics of the propagation path between the plurality of transmitting antennas and the plurality of receiving antennas is low, and a high transfer rate is unattainable in this case. On the other hand, in spectrum aggregation, the transfer rate increases with the number of channels. Therefore,
    high throughput is more reliably achieved by spectrum aggregation than by MIMO.
    In view of the above, the control unit 142 gives a higher priority to operation in the spectrum aggregation mode. This guarantees the highest transfer rate. On the other hand, when the volume of traffic increases and the degree of congestion (or usage) becomes higher, it is desirable to reduce the bandwidth occupied by the user. Therefore, control unit 142 switches the spectrum aggregation mode to MIMO mode according to an increase in traffic volume.
    For example, in the case where channel groups # 1 through # 3 are used for spectrum aggregation communication with relay node 30 or user equipment 20 and when the degree of congestion of channel groups # 1 and # 2 exceeds a limit, as shown in figure 12, the control unit 142 switches the spectrum aggregation mode to MIMO mode. Control unit 142 can use channel group # 3 with the degree of congestion below the limit in MIMO mode. Note that the degree of congestion may be the absolute traffic volume in each channel group or the resource usage rate in each channel group. In addition, the limit of the degree of congestion may differ between channel groups.
    In addition, when the degree of congestion of a certain group of channels exceeds the limit, but the degree of congestion of a plurality of channel groups remains below the limit, the control unit 142 can continue to operate in spectrum aggregation mode - by excluding a certain group of channels with the degree of congestion exceeding the limit. For example, when the degree of congestion of only channel group # 1 exceeds the limit, control unit 142 may continue to perform spectrum aggregation by using channel groups # 2 and # 3.
    In addition, by switching to MIMO mode, the control unit 142 can transmit triggering information to notify (stimulate) the switch to the relay node 30 or user equipment 20, which is the other end of spectrum aggregation communication. For example, the control unit 142 can transmit the triggering information using PDCCH or PDSCH. In addition, the trigger information may contain channel information (center frequency, bandwidth, etc.) used for MIMO communication or information that indicates switching synchronism.
    In this way, the control unit 242 of the relay node 30 or user equipment 20 can switch the transmit / receive mode of the analog processing unit 210 and / or the digital processing unit 230 to the MIMO mode based on the information firing time. Note that the analog processing unit 210 and / or the digital processing unit 230 waits to receive a MIMO preamble by switching to MIMO mode.
    The configurations of user equipment 20 and base station 10 are described above. In the following, a series of the flow for switching the transmit / receive mode is described in relation to figure 13.
    Figure 13 is a sequence graph showing a flow for switching the transmit / receive mode. First, user equipment 20 acquires information from a plurality of channels used by base station 10 in response to a command from base station 10, for example (S404). Thereafter, user equipment 20 classifies the plurality of channels used by the base station 10 into channel groups (S408). Specifically, user equipment 20 classifies one or more of a channel that can be simultaneously processed by each branch as a group of channels.
    User equipment 20 then determines a combination of each branch and a channel group with the highest quality of communication on each branch (S412), and requests that base station 10 use the channel group whose combination with the branch is determined (S416). After that, the base station 10 performs connection processing with the «user equipment 20 and allocates a resource block on the requested channels in the user equipment 20, and the base station 10 and the user equipment 20 can thus carry out communication of data by spectrum aggregation (S420). After that, when the degree of traffic congestion in the cell exceeds a certain criterion (YES in S424), base station 10 transmits triggering information that indicates switching from spectrum aggregation mode to MIMO mode to user equipment 20 (S428 ). Based on the triggering information, user equipment 20 switches the transmit / receive mode to MIMO mode and then performs data communication with base station 10 via MIMO (S432). Note that, when cell traffic congestion is reduced, base station 10 can give a command to perform processing from S404 to user equipment 20 to switch to spectrum aggregation mode.
    As described above, during operation in the spectrum aggregation mode, the base station 10 switches the transmission / reception mode to the MIMO mode according to an increase in traffic volume. Thus, it is possible to guarantee high throughput by the spectrum aggregation mode when the traffic volume is low and to reduce the bandwidth occupied by the user by the MIMO mode when the traffic volume increases.
    (2-2. Multilink Connection) When more resources are available on another base station 10 than on connected base station 10, the relay node
    30 can switch the relay link to this base station 10 to thereby make effective use of resources.
    However, if a connection processing sequence (call setup) with another base station 10 is performed every time that the retransmission link is switched on, a switching delay occurs due to multiprocedures. In light of the foregoing, the retransmission node 30 according to the modality creates multilink connections with a plurality of base stations 10 with the use of a plurality of branches to thereby reduce the switching delay. This is described in detail below.
    First, the relay node 30 acquires usage channel information (center frequency, bandwidth, etc.) from a plurality of connectable base stations 10. Then, the relay node 30 makes the call configuration with the plurality of base stations. 10 and completes the procedure until the RRC connection is completed. In this way, the retransmission node 30 is in multi-connection with the plurality of base stations 10.
    Figure 14 is an explanatory view showing an illustrative example of the multi-connection connection of the relay node 30. In the example shown in figure 14, the relay node 30 is in multi-connection with the base station 10A and the base station 10B. Note that the relay node 30 can make the call setup in parallel using a plurality of branches (or links). For example, as shown in figure 14, the relay node 30 can simultaneously make the call setup with base station 10A using the branch A (or link A) and the call setup with base station 10B with use branch B (or link B).
    After that, the relay node 30 uses the highest gain relay link between the relay links with the plurality of base stations 10. For example, if the relay link gain with base station 10A is higher than the gain of the relay link with the base station 10B, in the example shown in figure 14, the relay node 30 selects the use of the relay link with the base station 10A. Specifically, relay node 30 retransmits communication related to user equipment 20 by using the relay link with base station 10A, and defines the relay link with base station 10B as a standby link.
    Base station 10 can add a specifier that - specifies whether the relay link with the connected relay node 30 is a link waiting on an interface (IF S1-MME) between management server 16 (MME) and the base station 10 or not. For example, in the example shown in figure 14, base station 10B can add the specifier that specifies that the relay link with relay node 30 is a waiting link to the interface with management server 16. Thus, the server management station 16 or base station 10 can perform processing according to whether each relay link is a call on hold or not. For example, management server 16 or base station 10 can give a higher priority when scheduling the relay call, which is not a call waiting, and can approve a request related to a call waiting if resources are available. In addition, the relay node 30 can use different branches for different connections. For example, relay node 30 can use branch A for the relay link with base station 10A, use branch B for the relay link with base station 10B and use branch N (or the N link) to the access link with user equipment 20. After this, when the need arises to reduce traffic, allocate resources or the like, relay node 30 selects the use of the call on hold. For example, relay node 30 can switch the relay link for use from the relay link with base station 10A to the relay link with base station 10B. Note that the relay node 30 can take necessary steps to obtain resources related to the relay link with base station 10B, while still relaying communication related to user equipment 20 by using the relay link with base station 10A. For example, relay node 30 can make advanced contact with management server 16 through base station 10 about resources that are intended to - obtain (resources that are likely to be switched). Thus, it is expected to respond instantly to a request to obtain resources from the relay node 30.
    By the exposed way, it is possible to reduce the delay time since the need arose to switch the relay link to switch the relay link. The same procedure also applies to the access connection. Specifically, user equipment 20 can reduce the switching delay of the access link by creating the multi-link connection with a plurality of connectable relay nodes 30.
    Figure 15 is an explanatory view showing an illustrative example of the multi-connection connection of user equipment 20. In the example shown in figure 15, relay node 30A is connected to base station 10A, relay node 30B is connected to base station 10B and user equipment 20 are in multi-connection with relay node 30A and relay node 30B. In this case, user equipment 20 can switch the access link for use between the access link with the relay node 30A and the access link with the relay node 30B as needed.
    (2-3. Combination of Comp and Spectrum Aggregation)
    Recently, CoMP (Coordinated Multipoint Transmission) was studied as a technique to improve the tolerance of the connection in relation to the user equipment existing at the edge of the cell. Comp is a technique in which a plurality of adjacent base stations transmit - simultaneously the same signal using the same channel. A modality that combines Comp and spectrum aggregation is described below. (Example 1) In this example, when traffic from a certain base station 10 is congested and a plurality of channels are not allocable on user equipment 20, base station 10 transmits a signal to user equipment 20 by using a channel and, simultaneously, a nearby base station 10 transmits a signal to user equipment 20 by using a different channel. Then, the retransmission node 30 receives the signals that are transmitted from a plurality of base stations 10 using different channels and transmits them to the user equipment.
    20. In this way, it is possible to improve the communication transfer rate related to user equipment 20. This is specifically described below in relation to figures 16 and 17.
    Figure 16 is an explanatory view showing an example of a combination of Comp and spectrum aggregation. As shown in figure 16, base station 10A transmits a signal to user equipment 20 using fl, and simultaneously base station 10B and base station 10C transmit signals to user equipment 20 using f5 and f9, respectively.
    Then, the relay node 30 receives the transmitted signals from the respective base stations 10 and transmits them to the user equipment 20. The relay node 30 can communicate with the respective base stations 10 by using different branches. For example, relay node 30 can communicate with base station 10A using branch A, communicate with base station 10B using branch B, and communicate with base station 10C using branch C.
    In addition, although relay node 30 receives signals on user equipment 20 from respective base stations 10 with discrete channels in the frequency domain, relay node 30 relays signals to user equipment 20 by using less dispersed channels. For example, when relay node 30 receives signals with channels fl, f5 and f9, which are discrete in the frequency domain, as shown in figure 17, relay node 30 can relay signals to user equipment 20 over use of channels f4, f5 and f6, which are consecutive in the frequency domain. Thus, because the user equipment 20 can receive the signals with channels f4, f5 and f6, which are consecutive in the frequency domain, it is possible to reduce the processing load of the user equipment 20.
    Although the case in which the number of channels for transmission is equal to the number of channels for reception is shown in figure 17, the number of channels for transmission may be less than the number of channels for reception. For example, the number of channels for reception can be three and the number of channels for transmission can be two. In this case, an encoding rate on the channels for transmission can be set higher than an encoding rate on the channels for receiving. Additionally, the number of channels for transmission can be one.
    In addition, a method of selecting a channel to be used for transmission is not particularly limited. For example, a channel to be used for transmission can be selected from the channels close to the frequency band in which high SINR is obtained with user equipment 20.
    (Example 2)
    In this example, base station 10 transmits signals to user equipment 20 that belongs to it with a plurality of channels per spectrum aggregation.
    Then, a nearby base station 10 also transmits a signal on the channel with a large attenuation between the signals in the plurality of channels transmitted from the base station 10, and the relay node 30 retransmits the signal to user equipment 20. Thus, it is possible to intensify the signal transmitted from the base station 10. This is specifically described below in relation to figures 18 and 19. Figure 18 is an explanatory view showing an example of a combination of Comp and spectrum aggregation.
    As shown in figure 18, base station 10A transmits signals to user equipment 20 using fl, f3 and f6. If the attenuation of f3 and f6 is large (when necessary, SNIR becomes unsatisfied), the base station 10B and base station 10C also transmit the signals that are transmitted by the base station 10A by the user3efó.
    For example, the signal transmitted by base station 10A using f3 is also transmitted by base station 10B using £ 2, and the signal transmitted by base station 10A using f6 is also transmitted by base station 10C using f7 . Then, as shown in figure 19, relay node 30 transmits the signal received from base station 10B with f2 to user equipment 20 using f3 and transmits the signal received from base station 10C with f7 to equipment user 20 using form6. In this configuration, it is possible to intensify the signals transmitted from the base station 10A using f3 and f6. Although the case where base stations 10B and 10C intensify signals by using frequencies other than those of base station 10A is described above, base stations 10B and 10C can intensify signals by using the same frequency as that of base station 10A.
    For example, base station 10B can use f3 and base station 10C can use f6.
    Additionally, in both example 1 and example 2, the management server 16 (MME / Communication Server Port) that monitors the respective connections between the base station 10, the relay node 30 and the user equipment 20 play an important role . Additionally, in example 1, information for placing spectrum aggregation between a plurality of adjacent base stations 10 in cooperation with each other is transmitted and received by the interface X2 between the base stations 10 and by the interface S1 between the base station 10 and the server management 16. The information can be a channel measurement report list for each channel used for spectrum aggregation, position and capacity information (bandwidth that can be transmitted and received at a time, etc.) from the node relay 30 or user equipment 20, extra resource information for each base station 10 or the like. In example 2 also, information to intensify spectrum aggregation channels is transmitted and received by the X2 interface and the S1 interface.
    Although preferred embodiments of the present invention are described in detail with respect to the accompanying drawings, the present invention is not limited to these. Those skilled in the art understand that various modifications, combinations, subcombination and alterations can occur, depending on the design requirements and other factors, to the extent that they fall within the scope of the attached claims or their equivalents.
    For example, it is not always necessary to perform the respective processing steps of communication system 1 of this specification in chronological order according to the sequence shown in the sequence graphs. For example, the respective processing steps of the communication system | they can be executed in a different sequence than the sequence shown in the sequence graphs or they can be executed in parallel.
    Furthermore, it is possible to create a computer program that makes hardware, such as a CPU, ROM and RAM, incorporated in the base station 10, in the user equipment 20 and in the relay node 30 to work equally with the respective elements base station 10, user equipment 20 and relay node 30 described above. Additionally, a memory medium that stores a computer program like this can be provided.
    LIST OF REFERENCE SIGNALS 10A, 10A, 10B, 10C Base station 20 User equipment 30, 30A, 30B Relay node 110, 210 Analog processing unit 130, 230 Digital processing unit 142, 242 Control unit 244 Selection unit channel
    权利要求:
    Claims (17)
    [1]
    1. Wireless communication station, characterized by the fact that it comprises: a plurality of antennas configured to receive and transmit wireless signals between the wireless communication station and at least one other device; a transceiver coupled to said plurality of antennas, said transceiver being compatible with MIMO and compatible with spectrum aggregation; and a controller that is triggered to switch between a MIMO operation mode and a spectrum aggregation operation mode, based on a detected channel usage level.
    [2]
    2. Communication station, according to claim 1, characterized by the fact that said transceiver is a multichannel transceiver, each channel in said multichannel transceiver having a separate analog processing section.
    [3]
    3. Communication station, according to claim 1, characterized by the fact that said wireless communication station is a base station.
    [4]
    4. Communication station, according to claim 3, characterized in that said base station additionally includes a detector configured to detect the level of use of the channel and to prepare an indicator that is transmitted to another device to trigger the another device to operate in the MIMO operation mode or in the operation mode - of spectrum aggregation based on the level of use of the detected channel.
    [5]
    5. Communication station, according to claim 1, characterized by the fact that said wireless communication station is a retransmission node.
    [6]
    6. Communication station, according to claim 5,
    characterized by the fact that said relay node is configured to receive a signal indicating whether the controller should switch between the mode of operation of MIMO and the mode of operation of aggregation of spectrum based on the level of use of the channel detected in another device.
    [7]
    7. Communication station, according to claim 1, characterized by the fact that said controller includes a usage detector that triggers a change of mode from said mode of operation of aggregation of spectrum to said mode of operation of MIMO when the said channel usage level is above a predetermined limit.
    [8]
    8. Communication station according to claim 1, characterized by the fact that said wireless communication station is a relay node, said relay node being configured to communicate with different base stations using communication operation modes different from a communication mode used by the relay node to communicate with the user equipment.
    [9]
    9. Communication station according to claim 8, characterized in that said transceiver is configured to receive a plurality of different transmissions from a plurality of base stations and to retransmit information in said plurality of transmissions to a single user equipment on a single communication link.
    [10]
    10. Communication station, according to claim 8, characterized by the fact that said relay node is additionally configured to receive signals from a first base station using spectrum aggregation, to combine information from said first base station with information received from a second base station via a different communication link and for forwarding the information from the first base station with the information at the second base station in a signal to said user equipment.
    [11]
    11. Communication station, according to claim 1, characterized by the fact that said controller is configured to make a request from a base station to assign a group of channels from a plurality of different candidate communication channels.
    [12]
    12. Method for exchanging information in a wireless communication system, characterized by the fact that it comprises: receiving signals through multiple antennas from a plurality of different signal sources; combine said signals and form an aggregate set of information; forming a transmission signal that includes said aggregated set of information; verify that a channel usage indication is above a predetermined level and transmit said aggregate set of information by —medium MIMO transmission when said use is detected on a communication channel as above said predetermined level, and transmit said set aggregate information in a mode of transmission by aggregation of spectrum when said use is detected as below said predetermined level.
    [13]
    13. Method, according to claim 12, characterized by the fact that it additionally comprises: detecting the level of use of the channel in said communication channel and comparing said level of use of the channel in relation to the predetermined level; and generating a trigger signal to trigger a switch between a MIMO operation mode and a spectrum aggregation operation mode, depending on a level of usage detected in said detection step.
    [14]
    14. Method, according to claim 12, characterized by the fact that it additionally comprises: relaying information in said aggregated set of information to a user equipment.
    [15]
    15. Method according to claim 14, characterized in that said relay step includes using a signaling protocol different from a signaling protocol used with signals - received by the relay node.
    [16]
    16. Non-transient computer-readable medium, characterized by the fact that it has instructions that, when executed by a processor, implement steps of: receiving signals through multiple antennas from a plurality of different signal sources; combine said signals and form an aggregate set of information; forming a transmission signal that includes said aggregated set of information; verify that a channel usage indication is above a predetermined level and transmit said aggregated set of information through MIMO transmission when said use is detected in a communication channel as above said predetermined level, and transmit said set aggregate information in a mode of transmission by aggregation of spectrum when said use is detected as below said predetermined level.
    [17]
    17. Wireless communication station, characterized by the fact that it comprises: a plurality of antennas configured to receive and transmit wireless signals between the wireless communication station and at least one other device; a transceiver coupled to said plurality of antennas, said transceiver being compatible with MIMO and compatible with spectrum aggregation; and device for switching between a MIMO operation mode and a spectrum aggregation operation mode based on a detected channel usage level.
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    US20210392652A1|2021-12-16|Resource exclusion and transmissions over sidelink with multi-trp enabled ues
    RU2761394C1|2021-12-07|User terminal and method for radio communication
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    同族专利:
    公开号 | 公开日
    CN102511192B|2016-02-24|
    EP2471326B1|2018-09-05|
    RU2012110177A|2013-09-27|
    US20140036825A1|2014-02-06|
    US9831990B2|2017-11-28|
    CN105656531B|2019-04-26|
    JP5515559B2|2014-06-11|
    US8824401B2|2014-09-02|
    JP2011071706A|2011-04-07|
    RU2529358C2|2014-09-27|
    IN2012DN02293A|2015-08-21|
    US8929321B2|2015-01-06|
    EP2471326A4|2015-11-11|
    CN102511192A|2012-06-20|
    WO2011036831A1|2011-03-31|
    CN105656531A|2016-06-08|
    US20120170507A1|2012-07-05|
    US9107207B2|2015-08-11|
    US20150318965A1|2015-11-05|
    US20140036826A1|2014-02-06|
    EP2471326A1|2012-07-04|
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    2020-08-04| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04W 72/04 , H04J 99/00 , H04W 16/26 , H04W 16/28 Ipc: H04B 7/0413 (2017.01), H04B 7/06 (2006.01), H04B 7 |
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    2021-07-06| B11D| Dismissal acc. art. 38, par 2 of ipl - failure to pay fee after grant in time|
    2021-11-03| B350| Update of information on the portal [chapter 15.35 patent gazette]|
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009220484A|JP5515559B2|2009-09-25|2009-09-25|Communication system, base station, and communication apparatus|
    JP2009-220484|2009-09-25|
    PCT/JP2010/004087|WO2011036831A1|2009-09-25|2010-06-18|Communication system, method, base station, and communication device|
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