Method and user equipment for transmitting uplink control information and method and base station fo

专利摘要:
RADIOBASE STATION AND USER EQUIPMENT AND METHODS THEREIN. Embodiments of the present invention relate to a method in a user equipment (10) for transmitting uplink control information in time slices in a subframe over a radio channel to a radio base station. The radio channel is arranged to carry uplink control information and the user equipment and base station are comprised in a radio communication network. Uplink control information is comprised of a block of bits. User equipment maps the block of bits to a sequence of complex-valued modulation symbols. The user equipment also scatters the sequence of complex-valued modulation symbols by means of Spreading Discrete Fourier Transform - Orthogonal Frequency Division Multiplexing (DFTS-OFDM) symbols. This is accomplished by applying a spreading sequence to the complex-valued modulation symbol sequence, to obtain a complex-valued modulation symbol block spreading sequence. The user equipment further transforms the block-scattering sequence of complex-value modulation symbols by DFTS-(...) symbol.
公开号:BR112012017856B1
申请号:R112012017856-3
申请日:2011-01-18
公开日:2022-02-15
发明作者:Robert Baldemair；David Astely；Dirk Gerstenberger；Daniel Larsson；Stefan Parkvall
申请人:Telefonaktiebolaget Lm Ericsson (Publ)；
IPC主号:

专利说明:

Technical Field
[0001] Embodiments of the present invention relate to a radio base station, user equipment and methods therein. In particular, embodiments of the present invention pertain to transmitting uplink control information comprised of a block of bits over a radio channel to the radio base station. Fundamentals
[0002] In radio communication networks nowadays a number of different technologies are used, such as Long Term Evolution (LTE), LTE-Advanced, Broadband Code Division Multiple Access (WCDMA) from 35th Generation (3GPP), Global System for Mobile Communications/Increased Data Speed for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access (WiMax), and Ultra Mobile Broadband (UMB), to name just a few.
[0003] Long Term Evolution (LTE) is a project in the 35 Generation Society Project (3GPP) to develop the WCDMA standard towards fourth generation mobile telecommunication networks. Compared to WCDMA, LTE provides increased capacity, much higher peak data rates and significantly improved latency numbers. For example, the LTE specifications support peak downlink data speeds of up to 300 Mbps, peak uplink data speeds of up to 75 Mbit/s, and radio access network round-trip times of less than 10 ms. In addition, LTE supports scalable carrier bandwidths from 20 MHz down to 1.4 MHz and supports both Frequency Division Duplex (FDD) and Time Division Duplex (TDD) operation.
[0004] LTE is a frequency division multiplexing technology in which Orthogonal Frequency Division Multiplexing (OFDM) is used in a downlink (DL) transmission from a radio base station to a user equipment. Frequency Domain Multiple Access - Single Carrier (SC-FDMA) is used in an uplink (UL) transmission from the user equipment to the base station. LTE services are supported in the packet switched domain. SC-FDMA used in the uplink is also referred to as Spreading Discrete Fourier Transform (DFTS)-OFDM.
[0005] The basic LTE downlink physical resource can thus be viewed as a frequency-time grid as illustrated in Figure 1, where each Resource Element (RE) corresponds to an OFDM subcarrier during an OFDM symbol interval. A symbol range comprises a cyclic prefix (cp), whose cp is a prefix of a symbol with a symbol end repetition to act as a protection band between symbols and/or facilitate frequency domain processing. Frequencies f or subcarriers having a subcarrier spacing Δf are defined along a z-axis and symbols are defined along an x-axis.
[0006] In the time domain, LTE downlink transmissions are organized into 10 ms radio frames, each radio frame comprising ten equally sized subframes, #0 - #9, each with a Tsubframe = 1 ms long in time as shown in Figure 2. Furthermore, resource allocation in LTE is typically described in terms of resource blocks, where a resource block corresponds to a 0.5 ms partition in the time domain and 12 subcarriers in the time domain. frequency. Resource blocks are numbered in the frequency domain, starting with resource block 0 at one end of the system bandwidth.
[0007] Downlink transmissions are dynamically scheduled, i.e. in each subframe the base station or base station transmits control information about which user equipment or terminals the data is transmitted and about which resource blocks the data is transmitted , in the current downlink subframe. This control signaling is typically transmitted in the first 1, 2, 3 or 4 OFDM symbols in each subframe. A downlink system with 3 OFDM symbols used for control signaling is illustrated in Figure 3 and indicated as the control region. Feature elements used for control signaling are indicated with wavy lines and feature elements used for reference symbols are indicated with diagonal lines. Frequencies f or subcarriers are defined along a z-axis and symbols are defined along an x-axis.
[0008] LTE uses Hybrid Automatic Repeat Request (ARQ), where after receiving downlink data in a subframe, the user equipment tries to decode it and reports it to the base station using uplink control signaling if the decoding was successful by sending an Acknowledgment (ACK) if decoding successful or a "non-Acknowledgement" (NACK) if decoding not successful. In the event of an unsuccessful decoding attempt, the base station may retransmit the erroneous data.
[0009] Uplink control signaling from user or terminal equipment to base station or radio base station comprises 1. ARQ-hybrid acknowledgments for received downlink data;2. reports from user or terminal equipment related to downlink channel conditions, used as an assistance for downlink programming;3. schedule requests, indicating that a user or terminal equipment needs uplink resources for uplink data transmissions.
[0010] Uplink control information can be transmitted in two different modes:4. on the Physical Uplink Shared Channel (PUSCH). If the user or terminal equipment has been allocated resources for transmitting data in the current subframe, uplink control information, including ARQ-hybrid acknowledgments, is transmitted along with data in PUSCH;5. on the Physical Uplink Control Channel (PUCCH). If the user or terminal equipment has not been allocated resources for data transmission in the current subframe, uplink control information is transmitted separately in PUCCH, using resource blocks specifically allocated for this purpose.
[0011] Here the focus is on the last mentioned case, that is, where Layer1/Layer2 (L1/L2) control information, exemplified by channel status reports, ARQ-hybrid acknowledgments, and schedule requests, are transmitted on uplink resources, i.e., on resource blocks specifically allocated for uplink L1/L2 control information on the Physical Uplink Control Channel (PUCCH). Layer 1 comprises a physical layer and Layer 2 comprises the data link layer. As illustrated in Figure 4, PUCCH resources 41, 42 are located at the edges of the total available cell uplink system bandwidth. Each such resource comprises twelve "subcarriers", i.e. comprises a block of resource, in each of two partitions of an uplink subframe. To provide frequency diversity, these frequency features are frequency hopping at the partition boundary as illustrated by the arrow, i.e. in a subframe there is a "resource" 41 comprising 12 subcarriers at the top of the spectrum in a first subframe partition and an equally sized feature 42 at the bottom of the spectrum during a second subframe partition or vice versa. If more resources are required for uplink L1/L2 control signaling, for example in the case of very large overall transmission bandwidth supporting a large number of users, additional resource blocks can be assigned alongside the data blocks. previously assigned resource. Frequencies f or subcarriers are defined along a z-axis and symbols are defined along an X-axis.
[0012] The reasons for locating PUCCH resources at the edges of the general available spectrum are:6. along with the frequency hopping described above, locating PUCCH resources at the edges of the overall available spectrum maximizes the frequency diversity experienced by control signaling;7. Assigning uplink resources to the PUCCH at other positions in the spectrum, i.e. not at the edges, would have fragmented the uplink spectrum, making it impossible to assign very wide transmission bandwidths to single mobile user equipment or terminal and still retain single-carrier ownership of the uplink transmission.
[0013] The bandwidth of a resource block during a subframe is too large for the control signaling needs of a single-user terminal or equipment. Therefore, to efficiently exploit separate resources for control signaling, multiple user equipment or terminals can share the same resource block. This is done by assigning different user equipment or terminals to different orthogonal phase rotations of a 12-frequency domain sequence of specific cell length.
[0014] The resource used by a PUCCH, therefore, is not only specified in the time frequency domain by the resource-block pair, but also by the applied phase rotation. Similar to the case of reference signals, there are up to twelve different phase rotations specified, giving up to twelve different orthogonal sequences of each specific cell sequence. However, in the case of frequency selective channels, not all twelve phase rotations can be used if orthogonality is to be retained. Typically, up to six rotations are considered usable in a cell.
[0015] As mentioned above, L1/L2 uplink control signaling includes ARQ-hybrid acknowledgments, channel status reports, and scheduling requests. Different combinations of these message types are possible, using one of two available PUCCH formats capable of carrying different number of bits.
[0016] PUCCH Format 1. There are actually three formats, 1, 1a, and 1b in the LTE specifications, although here they are all referred to as format 1 for simplicity. PUCCH 1 format is used for ARQ-hybrid acknowledgments and schedule requests. It is capable of carrying up to two bits of information in addition to Discontinuous Transmission (DTX). If no transmission of information was detected on the downlink, no acknowledgment is generated, also known as DTX. Consequently, there are 3 or 5 different combinations, depending on whether MIMO was used on the downlink or not. This is illustrated in figure 5. In col. 51 the combination index is indicated; in col. 52 the ARQ information sent when no MIMO is used, and in col. 53 ARQ information is shown when MIMO is used, when received: a first transport block and a second transport block.
[0017] The PUCCH 1 format uses the same structure in the two partitions of a subframe, as illustrated in Figure 6. For transmission of a hybrid-ARQ acknowledgment (ACK), the single hybrid-ARQ acknowledgment bit is used to generate a Binary Phase Shift Keying (BPSK) symbol, in the case of downlink spatial multiplexing the two acknowledgment bits are used to generate a Quadrature Phase Shift Keying (QPSK) symbol. For a programming request, on the other hand, the BPSK/QPSK symbol is replaced by a constellation point treated as negative acknowledgment in the base station or developed NodeB (eNodeB). Each BPSK/QPSK symbol is multiplied with a 12-length phase rotated sequence. These are then weighed with a length-4 sequence before being transformed in an IFFT process. Phase shifts vary in SC-FDMA or DFTS-OFDM symbol level. Reference symbols (RS) are weighted with a string of length-3. The modulation symbol is then used to generate the signal to be transmitted in each of the two PUCCH partitions. BPSK modulation symbols, QPSK modulation symbols, and complex value modulation symbols are examples of modulation symbols.
[0018] For the PUCCH 2 format, there are also three variants in the LTE specification, formats 2, 2a and 2b, where the last two formats are used for simultaneous transmission of ARQ-hybrid acknowledgments as discussed later in this section. However, for simplicity, they are all referred to as format 2 here.
[0019] Channel status reports are used to provide the base station or eNodeB with an estimate of channel properties on user equipment or terminal to aid channel dependent programming. A channel status report comprises multiple bits per subframe. The PUCCH 1 format, which is capable of at most two bits of information per subframe, can obviously not be used for this purpose. The transmission of channel status reports on the PUCCH is instead handled by PUCCH 2 format, which is capable of multiple bits of information per subframe.
[0020] The PUCCH 2 format, illustrated for normal cyclic prefix in Figure 7, is based on a phase rotation of the same cell-specific sequence as format 1, i.e., 12-length phase rotated sequence that is varying by SC-FDMA or DFTS-OFDM symbol. Information bits are block encoded, QPSK modulated, each QPSK symbol b0-b9 from encoding is multiplied by phase-rotated 12-length sequence, and all SC-FDMA or DFTS-OFDM symbols are finally IFFT processed before of transmitted.
[0021] To meet the future Advanced requirements of International Mobile Telecommunications (IMT), 3GPP is currently standardizing on LTE Release 10 also known as LTE-Advanced. A property of Release 10 is the support of bandwidths greater than 20 MHz while still providing backwards compatibility with Release 8. This is achieved by aggregating multiple component carriers, each of which can be Release 8 compatible, to form a higher overall bandwidth for a Release 10 user equipment. This is illustrated in Figure 8, where five 20 MHz are aggregated into 100 MHz.
[0022] In essence, each of the component carriers in figure 8 is separately processed. For example, hybrid ARQ is operated separately on each component carrier, as illustrated in Figure 9. For hybrid-ARQ operation, acknowledgments informing the sender whether the reception of a transport block was successful or not is required. A straightforward way to accomplish this is to transmit multiple acknowledgment messages, one per component carrier. In the case of spatial multiplexing, an acknowledgment message would correspond to two bits as there are two transport blocks on a component carrier in this case there are in the first release of LTE. In the absence of spatial multiplexing, an acknowledgment message is a single bit since there is only a single transport block per component carrier. Each F1 -Fi stream illustrates a data stream for the same user. Radio Link Control (RLC) for each incoming data stream is performed at the RLC layer. At the Medium Access Control (MAC) layer, MAC multiplexing and HARQ processing is performed on the data stream. At the physical layer (PHY) the OFDM encoding and modulation of the data stream is performed.
[0023] Transmission of multiple ARQ-hybrid acknowledgment messages, one per component carrier, can in some situations be cumbersome. If the current LTE Frequency Division Multiplex (FDM) uplink control signaling structures were to be reused, a maximum of two bits of information can be sent back to the base station or eNodeB using the PUCCH 1 format .
[0024] One possibility is to group multiple acknowledgment bits into a single message. For example, ACK could be signaled only if all transport blocks on all component carriers are correctly received in a given subframe, otherwise a NACK is fed back. A disadvantage of this is that some transport blocks may be retransmitted even if they are correctly received, which could reduce system performance.
[0025] The introduction of a multi-bit hybrid ARQ recognition format is an alternative solution. However, in the case of multiple downlink component carriers, the number of acknowledgment bits on the uplink can become quite large. For example, with five component carriers, each using MIMO, there are 55 different combinations, keeping in mind that DTX is preferably considered as well, requiring at least log2(55) ~ 11.6 bits. The situation can be even worse in Time Division Duplex (TDD), where multiple downlink subframes may need to be recognized in a single uplink subframe. For example, in a TDD configuration with 4 downlink subframes and 1 uplink subframe per 5 ms, there are 55-4 combinations, corresponding to more than 46 bits of information.
[0026] Currently, there is no specified LTE PUCCH format capable of carrying such a large number of bits. summary
[0027] An objective of the embodiments of the present invention is to provide a mechanism that enables high transmission performance in a radio communication network in an efficient manner.
[0028] According to a first aspect of embodiments of the present invention the object is achieved by a method in a user equipment to transmit uplink control information in time slices in a subframe over a radio channel to a radio station base. The radio channel is arranged to carry uplink control information and user equipment and radio base station are comprised in a radio communication network. Uplink control information is comprised of a block of bits.
[0029] User equipment maps the bit block to a complex value modulation symbol sequence. The user equipment also scatters the complex value modulation symbol sequence in blocks across Orthogonal Frequency Division Multiplexing - Discrete Fourier Transform Scattering (DFTS-OFDM) symbols. This is accomplished by applying a spreading sequence to the complex value modulation symbol sequence to obtain a complex value modulation symbol block spreading sequence. The user equipment further transforms the block spreading sequence of complex value modulation symbols by DFTS-OFDM symbol. This is accomplished by applying an array that depends on a DFTS-OFDM symbol index and/or partition index to the block-spreading sequence of complex-valued modulation symbols. The user equipment also transmits the transformed complex value modulation symbol block spreading sequence over the radio channel to the radio base station.
[0030] According to another aspect of embodiments of the present invention the objective is achieved by a user equipment to transmit uplink control information in time slices in a subframe over a radio channel to a radio base station. The radio channel is arranged to carry uplink control information, and the uplink control information is comprised of a block of bits.
[0031] The user equipment comprises a mapping circuit configured to map the block of bits to a sequence of complex-valued modulation symbols. Furthermore, the user equipment comprises a block spreading circuit configured to block spread the sequence of complex value modulation symbols across DFTS-OFDM symbols by applying a spreading sequence to the sequence of complex value modulation symbols , to obtain a block-scattering sequence of complex-value modulation symbols.
[0032] In addition, the user equipment comprises a transform circuit configured to transform the block spreading sequence of complex value modulation symbols by DFTS-OFDM symbol. This is done by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition index to the block spreading sequence of complex-valued modulation symbols. The user equipment also comprises a transmitter configured to transmit the complex-value modulation symbol block spreading sequence that has been transformed over the radio channel to the radio base station.
[0033] According to another aspect of embodiments of the present invention the objective is achieved by a method at a radio base station to receive uplink control information in time slots in a subframe over a radio channel from a user equipment. The radio channel is arranged to carry uplink control information and the uplink control information is comprised of a block of bits. The user equipment and the base station are comprised of a radio communication network.
[0034] The base station receives a complex value modulation symbol sequence. The base station also OFDM demodulates the complex value modulation symbol sequence. The base station also transforms, per DFTS-OFDM symbol, the complex-value modulation symbol sequence that has been OFDM demodulated by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition index to the OFDM demodulated sequence. of complex value modulation symbols.
[0035] The base station further descatters the complex value modulation symbol sequence that has been OFDM demodulated and transformed with a descattering sequence. The base station also maps the complex value modulation symbol descatter sequence that has been OFDM demodulated and transformed into the bit block.
[0036] According to another aspect of embodiments of the present invention the objective is achieved by a radio base station to receive uplink control information in time slots in a subframe over a radio channel from a user equipment . The radio channel is arranged to carry uplink control information, and the uplink control information is comprised of a block of bits. The base station comprises a receiver configured to receive a complex value modulation symbol sequence. The base station also comprises an OFDM demodulation circuit configured to OFDM demodulate the complex value modulation symbol sequence. The base station further comprises a transforming circuit configured to transform, per DFTS-OFDM symbol, the sequence of complex-value modulation symbols that has been OFDM demodulated by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition index for the OFDM demodulated sequence of complex value modulation symbols. The base radio station also comprises a block despreading circuit configured to block despread the complex value modulation symbol sequence that has been OFDM demodulated and transformed with a despreading sequence. Furthermore, the base station comprises a mapping circuit configured to map the complex value modulation symbol descattering sequence that has been OFDM demodulated and transformed to the bit block.
[0037] Thereby inter-cell interference is reduced as the matrix or matrices transform the block spreading sequence of complex-value modulation symbols by DFTS-OFDM symbol and thereby increase interference suppression.
[0038] According to another aspect of embodiments of the present invention the objective is achieved by a method at a terminal to transmit uplink control information in a partition in a subframe over a channel to a base station in a communication system wireless. The uplink control information is comprised of a code word. The terminal maps the codeword to modulation symbols. The terminal block spreads the modulation symbols across DFTS-OFDM symbols by repeating the modulation symbols for each DFTS-OFDM symbol; and applying a block spreading sequence of weighting factors to the repeated modulation symbols to obtain a respective weighted copy of the modulation symbols for each DFTS-OFDM symbol. The terminal then transforms, for each DFTS-OFDM symbol, the respective weighted copy of the modulation symbols by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition index on the respective weighted copy of the modulation symbols. The terminal then transmits on or at each DFTS-OFDM symbol, the respective weighted copy of the modulation symbols that has been transformed to the base station.
[0039] In some embodiments of the present invention, a transmission format is provided in which a codeword or block of bits corresponding to uplink control information from all configured or activated component carriers of a single user is mapped to symbols of modulation as a sequence of complex value modulation symbols spread in blocks over DFTS-OFDM symbols using a spreading sequence. The sequence of symbols in a DFTS-OFDM symbol is then transformed and transmitted into a DFTS-OFDM symbol. User multiplexing is allowed with block spreading, i.e. the same symbol or signal sequence is spread across all DFTS-OFDM symbols in a partition or subframe, and DFTS-OFDM per symbol transformation reduces inter-cell interference . Brief Description of Drawings
[0040] The modalities will now be described in more detail with respect to the attached drawings, in which Figure 1 is a block diagram representing features on a time-frequency grid, Figure 2 is a block diagram representing a structure Fig. 3 is a block diagram representing symbols distributed across a downlink subframe, Fig. 4 is a block diagram representing L1/L2 control signaling transmission from uplink in PUCCH, Figure 5 is a table defining combinations of HARQ information, Figure 6 is a block diagram of PUCCH 1 format with normal cyclic prefix length, Figure 7 is a block diagram of PUCCH 2 format with normal cyclic prefix length, Fig. 8 is a block diagram representing carrier aggregation, Fig. 9 is a block diagram representing PHY and RLC/MAC layers for carrier aggregation, Fig. 10 is a d Block diagram representing a radio communication network, Fig. 11 is a block diagram representing a process in a user equipment, Fig. 12 is a block diagram representing a process in a user equipment, Fig. 13 is a block diagram representing a process on a user equipment, Figure 14 is a block diagram representing a process on a user equipment, Figure 15 is a block diagram representing a process on a user equipment Figure 16 is a block diagram representing a process on a user equipment, Figure 17 is a block diagram representing a process on a user equipment, Figure 18 is a block diagram representing a process in a user equipment,Figure 19 is a block diagram representing a process in a user equipment,Figure 20 is a schematic flowchart of a process in a user equipment,Figure 21 is a diagram Block diagram representing user equipment, Fig. 22 is a schematic flowchart of a process at a radio base station, and Fig. 23 is a block diagram representing a radio base station. Detailed Description
[0041] Figure 10 shows a schematic radio communication network, also referred to as a wireless communication system, according to a radio access technology such as Long-Term Evolution (LTE), LTE-Advanced, Multiple Access 3rd Generation Society Project (3GPP) Broadband Code Division (WCDMA), Global System for Mobile Communications/Increased Data Speed for GSM Evolution (GSM/EDGE), Worldwide Interoperability for Microwave Access ( WiMax), or Ultra Mobile Broadband (UMB), citing some possible implementations.
[0042] The radio communication network comprises a user equipment 10, also referred to as a terminal 10, and a radio base station 12. The radio base station 12 serves the user equipment 10 in a cell 14 by providing radio coverage across a geographic area. The radio base station 12 is transmitting data in a downlink (DL) transmission to the user equipment 10 and the user equipment 10 is transmitting data in an uplink transmission (UL) to the radio base station 12. UL can be efficiently generated by using an Inverse Fast Fourier Transform (IFFT) process at user equipment 10 and then demodulated at base station 12 by using a Fast Fourier Transform (FFT) process.
[0043] It should be noted here that the radio base station 12 may also be mentioned as, for example, a NodeB, a developed NodeB (eNB, eNode B), a base station, a base transceiver station, access, base station router, or any other network unit capable of communicating with user equipment in the cell served by base station 12, depending, for example, on the radio access technology and terminology used. User equipment 10 may be represented by a terminal, for example, a wireless communication user equipment, a mobile cell phone, a Personal Digital Assistant (PDA), a wireless platform, a laptop, a computer or any other type of device capable of communicating wirelessly with the base station 12.
[0044] Base station 12 transmits control information about which user equipment the data is transmitted to and which resource blocks the data is transmitted to. User equipment 10 attempts to decode control and data information and reports to base station 12 using uplink control signaling whether data decoding was successful in which case an Acknowledgment (ACK) is transmitted, or not. successful, in which case a non-Acknowledgement (NACK, NAK) is transmitted.
[0045] In accordance with embodiments of the present invention the user equipment 10 is arranged to transmit a block of bits corresponding to uplink control information in partitions, i.e. time partitions, in a subframe over a channel, i.e. , a radio channel, to base radio station 12. The block of bits may comprise jointly encoded ACK and/or NACK. The channel may be a Physical Uplink Control Channel (PUCCH), which is a device radio channel for carrying uplink control information. The block of bits may also be referred to as a number of bits, code word, encoded bits, information bits, an ACK/NACK sequence or the like.
[0046] User equipment 10 maps the block of bits to modulation symbols, that is, to a sequence of complex-valued modulation symbols. This mapping can be a QPSK mapping where the resulting QPSK modulation symbol is of complex value, where one of the two bits in each QPSK modulation symbol represents the real part, also referred to as an I channel, of the modulation symbol and the other bit the imaginary part, also referred to as a Q channel, of the modulation symbol. Modulation symbols may be referred to as complex value modulation symbols, QPSK symbols, QPSK symbols or the like.
[0047] User equipment 10 then scatters the complex value modulation symbol sequence with a scattering sequence as an orthogonal sequence. For example, the same signal or block that has been mapped to complex-valued modulation symbols can be spread across all DFTS-OFDM symbols in a DFTS-OFDM symbol set by applying the spreading sequence to the modulation symbol sequence. complex value representing the signal or block of bits. The complex-valued modulation symbol block spreading sequence may thus be divided into parts, or segments, where each segment or part of the complex-valued modulation symbol block spreading sequence corresponds to or is allocated to a DFTS symbol. - OFDM from the DFTS-OFDM symbol set, that is, there is a one-to-one correspondence between the segments or parts and the DFTS-OFDM symbols. DFTS-OFDM symbols are also referred to as SD-FDMA symbols. SC-FDMA can be seen as normal OFDM with a DFT-based precoding.
[0048] In accordance with embodiments of the present invention, the user equipment 10 then transforms or pre-encodes the block spreading sequence of complex-value modulation symbols per DFTS-OFDM symbol with a matrix that depends on a DFTS symbol index -OFDM and/or partition index. In this way, each segment or part of the complex-valued modulation symbol block spreading sequence that corresponds to or is allocated to a DFTS-OFDM symbol is transformed separately by applying the matrix to that segment or part of the block spreading sequence of complex value modulation symbols. The matrix may be a general matrix comprising a DFT matrix, for example a DFT matrix that is cyclically shifted, wherein the amount of cyclic shift varies with the DFTS-OFDM symbol index and/or partition index. By transforming the block-scattering sequence of complex-value modulation symbols in this way, inter-cell interference is reduced. A partition comprises several DFTS-OFDM symbols, i.e. each partition is associated with multiple matrices, one for each DFTS-OFDM symbol. The partition index indicates the time partition to which the array or arrays should be applied. The DFTS-OFDM symbol index indicates the DFTS-OFDM symbol, and thus the segment or part of the block spreading sequence of complex-valued modulation symbols, to which the matrix is to be applied.
[0049] User equipment 10 then transmits the transformed complex value modulation symbol block spreading sequence. For example, user equipment 10 can modulate OFDM further and transmit each transformed or pre-encoded segment or part of the block spreading sequence in the time duration of a DFTS-OFDM symbol, i.e., the DFTS-OFDM symbol that corresponds to the respective segment or part of the complex value modulation symbol block spreading sequence. The process may be referred to as pre-encoded/transformed OFDM modulation.
[0050] In a variation of this embodiment the sequence of complex value modulation symbols can be divided into multiple parts and each part of the sequence of complex value modulation symbols can be transmitted in a time partition.
[0051] Some embodiments of the present invention may refer to ACK/NACK transmission in PUCCH in a radio communication network employing aggregation of multiple cells, i.e. component carriers, to support bandwidths greater than a single one. carrier while still providing backwards compatibility with earlier technologies. In such a radio communications network a PUCCH format is provided, in accordance with embodiments of the present invention, which is capable of carrying a greater number of bits than provided by existing PUCCH formats, so as to allow ACK/ NACK for each of the multicomponent carriers.
[0052] Embodiments of the present invention allow for the high payload PUCCH transmissions required for such signaling by providing a block spread DFTS-OFDM transmission format. According to this format, all ACK/NACK information from all carrier components of a single user equipment is jointly encoded in a code word. This codeword, corresponding to the uplink control information bit block, may in some embodiments then be scrambled to decrease inter-cell interference and mapped onto symbols such as the complex-valued modulation symbol sequence. Multiplexing of user equipment is allowed with block spreading, i.e. the same signal in the form of the codeword, possibly scrambled with a different sequence, or in the form of the symbols if the codeword was mapped to symbols before block spreading ; is spread or repeated across all DFTS-OFDM symbols in a partition or subframe, but the symbols are weighted with a different weight or scalar factor from a spread sequence for each DFTS-OFDM symbol in the subframe or time partition . The sequence of symbols of each DFTS-OFDM symbol is then transformed or pre-encoded with the matrix, for example a modified pre-coding matrix, and transmitted in the time duration of a DFTS-OFDM symbol. To further decrease interference the matrix of the modified DFTS-OFDM modulator is modified in a pseudo-random way, for example by permutation of matrix elements. The transformation or precoding can be a modified DFTS-OFDM modulation, where the DFT operation is combined with a cyclic shift operation or a shuffle operation.
[0053] Embodiments of the present invention provide a format, referred to as a PUCCH 3 format, which provides flexibility in that some solutions can be adapted to the increasing required payload of control information, also introduces means to improve inter-cell interference suppression. . These means are either or in combination, scrambling with a scrambling code, matrix selection, or cyclic shifting of matrix elements with a cyclic shifting pattern. Selection of scrambling code and/or cyclic shift pattern may depend on cell ID and/or radio frame/subframe/partition/symbol DFTS-0FDM number in a random manner to randomize inter-cell interference. In addition, the format or structure allows exchanging payload and/or coding gain and/or inter-cell interference suppression against multiplexing capability.
[0054] Figure 11 together with figure 12 represents a process modality in a user equipment 10 for block spreading of the complex value modulation symbol sequence. Fig. 11 shows how an ACK/NACK sequence a, which is an example of a block of bits corresponding to uplink control information, is transmitted in a DFTS-OFDM symbol. The a sequence represents ACK/NACKs from all aggregated component carriers. Alternatively, the individual bits may also have a logical AND connection of individual ACK/NACK bits. This a-sequence can not only represent ACK/NACKs, but discontinuous transmission (DTX) states can be encoded as well, for example, if no scheduling assignment has been received for certain component carriers.
[0055] In a first step the sequence a can be encoded in an error correction encoding module 111 to make it more robust against transmission errors. An error correction coding scheme used can be block codes, convolution codes, etc. the error correction coding module 111 may possibly also comprise an interleaver functionality arranging the block of bits so that errors can occur in a more evenly distributed mode to increase performance.
[0056] To randomize neighboring cell interference, specific shuffling of cells with a code c can be applied in a scrambling module resulting in a scrambled sequence, i.e. scrambled block of bits. The scrambled sequence is then mapped to modulation symbols, using QPSK, for example, in a symbol mapping module 112 resulting in a sequence of modulation symbols of complex value x and modulated and transmitted with a DFTS-OFDM modulator 113 resulting in the sequence v of symbols for transmission. The sequence v is a digital signal, so it can be fed into a digital-to-analog converter, modulated to radio frequency, amplified, fed to an antenna and then transmitted.
[0057] The DFTS-OFDM modulator 113 is a modified DFTS-OFDM modulator that comprises a G matrix 114 and may also comprise an IFFT module 115 and a cyclic prefix generator 116. Thereby, the sequence v is transmitted via a symbol DFTS-OFDM or in a DFTS-OFDM symbol duration. However, to allow multiplexing of different users or user equipment, the bit block must be transmitted via various DFTS-OFDM symbols to the base radio station 12. The G matrix 114 comprises matrix elements; and the matrix may correspond to a DFT operation together with a cyclic shift operation of rows or columns of matrix elements, or correspond to a DFT operation together with an operation of shuffling the matrix elements.
[0058] For example, the symbol mapping module 112 maps the block of bits onto a sequence of complex-valued modulation symbols, x. the block spreading sequence of complex-valued modulation symbols [w(0)x, w(1 )x, w(2)x, ... , w(K-1)x] is obtained after block spreading where w= [w(0), w(1), w(2), ... , w(K-1)] is a scattering sequence of scalars or weight factors, whose scattering sequence can in some modalities understand an orthogonal sequence. Modified DFTS-OFDM modulation is then done separately for each weighted copy or occurrence of modulation symbols w(0)x, w(1)x, w(2)x, ... , w(K-1)x. transmission is also done separately, eg OFDM(pre-encoded(w(0)x)), OFDM(pre-encoded(w(1)x)), etc. are performed. In this way, precoding and transmission can be done so that a weighted copy or occurrence of modulation symbols w(k)x is precoded and transmitted in each DFTS-OFDM symbol, for k=0, ... ,K-1 where K is the number of DFTS-OFDM symbols over which the modulation symbols are block spread. The spreading sequence, for example an orthogonal sequence, provides separation between user equipment, or more specifically, between uplink transmissions made by different user equipment.
[0059] It should also be understood that if no frequency hopping is applied, the solutions outlined above apply to a subframe, with parameters therefore adapted. The number of available DFTS-OFDM symbols could in this case be 12, assuming 2 DFT-OFDM symbols reserved for reference signals.
[0060] If frequency hopping is enabled, the solution outlined above can be applied to each partition, possibly with different scrambling codes and scattering sequences. In that case the same payload would be transmitted in both partitions. Alternatively, the scrambled sequence or modulation symbols, i.e. the complex value modulation symbol sequence is split into two parts and a first part is transmitted in a first partition and a second part in a second partition. In principle even the bit block a could be split and the first part could be transmitted in the first partition and the second part in the second partition. However, this is less preferable as in this case the block of bits processed and transmitted in each partition is smaller, eg half the size before division, resulting in reduced encoding gain.
[0061] Figure 12 shows a mode in which the signal or block of bits is spread in block. The processing chain comprises the error correction coding module 111. In the simplest case the same signal or block of bits is block spread, i.e. repeated several times, and mapped to modulation symbols, i.e. a sequence of complex-valued modulation symbols, and each copy or occurrence of the modulation symbols is weighted by a scalar w[k], also referred to as a weighting factor from a scattering sequence. It should be noted that mapping can take place before block spreading. If we have K DFTS-OFDM symbols the scattering sequence has length K, ie w[k], k = 0,1, ... K -1. K orthogonal scattering sequences can then be constructed and thus K users can be multiplexed. Thus, these orthogonal sequences K are used in block spreading of the modulation symbols, that is, the sequence of complex-valued modulation symbols. This is shown in figure 12 where each square labeled Mod1-ModK comprises modules 112-116 as per figure 11. Equivalent implementations allow application of the weight factor at other positions elsewhere after symbol mapping module 112 as illustrated in Fig. 12 where a weight factor w[0]-w[K-1] is applied to the respective sequence v after the DFTS-OFDM modulator 113 of the respective process chains for DFTS-OFDM symbols 0...K-1. Furthermore, it is equivalent to first map the block of bits to modulation symbols, e.g. complex value modulation symbols and then repeat the modulation symbols and repeat the block of bits and then map each repeated block of bits to modulation symbols .
[0062] In an alternative setup the signal or bit block transmitted in the K DFTS-OFDM symbols is not a copy, if it ignores the scaling of symbols by w[k], but each Mod1-ModK block in figure 12 actually performs shuffling with a different scrambling sequence. Otherwise, figure 11 is still valid. In that case, respective scrambling sequence may depend besides cell ID also on DFTS-OFDM radio frame/subframe/partition/symbol number. The scrambling, and especially that the scrambling sequence may depend on cell ID and/or radio frame/subframe/partition/ODFT-OFDM number provides better inter-cell interference randomization and decrease than PUCCH DFTS-OFDM transmissions of the state of the art.
[0063] Assuming, for example, a reference symbol, also indicated reference signal, per partition, K could be six assuming normal cyclic prefix, in LTE. Alternatively, if no frequency hopping is used K could be 12 assuming a reference signal per partition. The exact design of reference signals is not discussed further.
[0064] Depending on the number of resource blocks allocated in the DFTS-OFDM modulator 113 the number of encoded bits and thereby the code speed and/or payload size, ACK/NACK sequence length or a bit block, may be controlled. For example, if only a single resource block is allocated in the frequency domain 24 coded bits are available per DFTS-OFDM symbol, assuming QPSK symbols. If this is not enough, the number of allocated resource blocks can be increased. More encoded bits also allow for a longer scrambling code and resulting in higher scrambling gain.
[0065] It is worth mentioning that the proposed scheme allows multiplexing of users with different resource block allocations. In figure 13 an example is provided where three user devices are multiplexed. The first user equipment 10 requires a higher ACK/NACK payload and therefore occupies two resource blocks. For the two remaining user equipment, one resource block each is sufficient and these are multiplexed by Frequency Division Multiplexing (FDM). Since the user equipment is multiplexed by FDM, the user equipment can reuse the same spreading sequence, but of course they can also use different spreading sequences. In this example the spreading factor is 4. User equipment 10 that allocates two resource blocks uses the spreading code [1-1 1-1] resulting in block-spreading sequences of complex-valued modulation symbols over DFTS symbols -OFDM indicated as 121-124. The remaining user equipment uses code spreading [1 1 1 1] resulting in block spreading sequences of complex-value modulation symbols over DFTS-OFDM symbols indicated as 131-134 for a second user equipment and as 135-138 to a third user device.
[0066] Fig. 14 is a block diagram according to an embodiment representing a processing chain for transmitting uplink control information to a DFTS-OFDM symbol as a transmitter in user equipment 10. User equipment 10 may comprise the error correction encoding module 111, wherein the block of bits a may be encoded to make it more robust against transmission errors. To randomize neighboring cell interference cell-specific scrambling with code c can be applied resulting in a scrambled sequence. The scrambled sequence can then be mapped onto modulation symbols, i.e., a sequence of complex-valued modulation symbols in symbol mapping module 112, which is then block-spread with a spreading sequence (not shown). User equipment 10 transforms, for example, pre-encodes, per DFTS-OFDM symbol, the block spread sequence of complex value modulation symbols in DFTS-OFDM modulator 113 with G matrix 114 depending on DFTS symbol index -OFDM and/or partition index. In the illustrated example, matrix G 114 corresponds to a Discrete Fourier Transform (DFT) operation 141 together with a row or column cyclic shift operation 142. User equipment 10 may also comprise IFFT module 115 and cyclic prefix generator 116. Thereby, the block spreading sequence of complex value modulation symbols is modulated and transmitted through the DFTS-OFDM symbol or in a duration of DFTS-OFDM symbol. However, to allow multiplexing of different users, the bit error correction coded block must be transmitted via several DFTS-OFDM symbols to the base station 12.
[0067] A variation of the above modality is where the scrambled sequence is not mapped over a DFTS-OFDM symbol, but over several DFTS-OFDM symbols. Fig. 15 shows an example where a scrambled block of bits s is transmitted over two DFTS-OFDM symbols, or over the time duration of two DFTS-OFDM symbols. In this example, a scrambled sequence 48 bits long or bit block s is mapped to 24=2x12 QPSK symbols and transmitted in two DFTS-OFDM symbols, assuming a resource block allocation and each DFTS-OFDM symbol containing 12 symbols. Bit block a may be processed in an error correction encoding module 151, which may correspond to error correction encoding module 111 in Fig. 11. To randomize neighbor cell interference, cell-specific scrambling with a code c in a 152 bit scrambling module can be applied resulting in a scrambled sequence s, i.e. a scrambled block of bits. The scrambled sequence s is spread over or split into two different DFTS-OFDM symbols. The first half of s is then mapped to symbols, using QPSK, for example, in a first symbol mapping module 153 and modulated and transmitted with a first modified DFTS-OFDM modulator. The first modified DFTS-OFDM modulator comprises a first G precoding matrix 154 and may also comprise a first IFFT module 155 and a first cyclic prefix generator 156.
[0068] The second half of s is then mapped to symbols, e.g. to complex value modulation symbols, using QPSK, e.g. in a second symbol mapping module 153' and modulated and transmitted with a second DFTS modulator -OFDM modified. The second modified DFTS-OFDM modulator comprises a second G precoding matrix 154' and may also comprise a second I FFT module 155' and a second cyclic prefix generator 156'.
[0069] Thereby, the first half of the bit block is transmitted through the first DFTS-OFDM symbol and the second half of the bit block is transmitted through the second DFTS-OFDM symbol. However, to allow multiplexing of different users, the bit error correction coded scrambled block s must be transmitted via several DFTS-OFDM symbols to the base station 12.
[0070] An embodiment of a therefore modified block spreading process is represented in figure 16. In this example block spreading in the case where the scrambled block of bits s is transmitted via two DFTS-OFDM symbols is shown. Each "Mod" block comprises the arrangement shown in Figure 15, excluding error correction encoding functionality. This variation allows for higher payloads, and scrambling gain; compared to the baseline case in Figure 11. However, the price to pay is reduced multiplexing capacity. If we assume K DFTS-OFDM symbols are available for transmission and use L of them for one instance of the scrambled block of bits, the length of the spreading code or spreading sequence and thus the multiplexing capability - reduces to K/L. in this example the multiplexing capability is reduced by a factor of 2 compared to the case when the scrambled block of bits s is modulated and transmitted via a DFTS-OFDM symbol. The block of bits corresponding to uplink information such as ACK/NACKs is processed in an error correction encoding module 161, which may correspond to error correction encoding module 111 in Figure 11. Various Mod1-ModK modules /2 in Figure 16 performs scrambling with a different scrambling sequence, where a weight factor w[0]-w[(K/2)-1] is applied to the respective block spread modulation symbols, i.e. the respective block-scattering sequence of complex-value modulation symbols after Mod1-ModK/2 modules.
[0071] In another embodiment, in which the order of the scrambling operation and the symbol mapping is performed are changed according to figure 17. Here the scrambling is applied at the symbol level instead of at the bit level, which means that symbol mapping is performed before symbol shuffling. The scrambling code c may depend on the cell ID as well as the DFTS-OFDM radio frame/subframe/partition/symbol index number. The user equipment 10 may further comprise an error correction encoding module 171, wherein the sequence or block of bits a may be encoded to make it more robust against transmission errors. Error correction encoding module 171 may correspond to error correction encoding module 111 in Figure 1. The block of bits is then mapped onto modulation symbols, i.e. a sequence of complex-valued modulation symbols in a symbol mapping module 172. To randomize interference from neighboring cells, cell-specific scrambling with code c can be applied to symbols in a symbol scrambling module 173, resulting in a scrambled sequence s'. The scrambled sequence is then discrete Fourier transformed in a DFT module 174. Symbol scrambling module 173 and DFT module 174 can be comprised in the G matrix 114. Thereby, user equipment 10 then transforms, for example, precodes , per DFTS-OFDM symbol, the block-spread modulation symbols, i.e. the block-spread sequence of complex-valued modulation symbols, with matrix G 114 depending on a DFTS-OFDM symbol index and/or partition index. User equipment 10 may also comprise an IFFT module 175 and a cyclic prefix generator 176. Thereby the block spread modulation symbols, i.e. the block spread sequence of complex value modulation symbols, is transmitted. through the DFTS-OFDM symbol or in a DFTS-OFDM symbol duration. However, to allow multiplexing of different users, the bit block must be transmitted via several DFTS-OFDM symbols to the base station 12.
[0072] The scrambling operation can, in some embodiments, be mathematically described by multiplication with a diagonal matrix C whose diagonal elements are constituted by the elements of the scrambling code c, where c is the symbol-level scrambling sequence. The subsequent DFT operation can be described by the DFT matrix F. Using this notation the combined operation can, for these illustrated examples, be expressed by the matrix G = FC. The shuffling and DFT operation can be performed on the G matrix. In this case, the block spreading is performed before the shuffling operation.
[0073] In figure 18 a block diagram of embodiments of the present invention is disclosed. User equipment 10 may alternatively comprise an error correction encoding module 181, wherein the sequence or block of bits a may be encoded to make it robust against transmission errors. Error correction coding module 181 can correspond to error correction coding module 111 in Fig. 11 . To randomize neighboring cell interference cell-specific scrambling with code c can be applied to the possible error correction coded block of bits in a bit scrambling module 182. The scrambled block of bits s is then mapped onto a complex value modulation symbol sequence in a symbol mapping module 183. The modulation symbols are block spread with a spreading sequence (not shown). User equipment 10 then transforms, for example, pre-encodes, per DFTS-OFDM symbol, the block spreading sequence of complex-valued modulation symbols, with matrix G 114 depending on a symbol index DFTS-OFDM and/or partition index. User equipment 10 may also comprise an IFFT module 185 and a cyclic prefix generator 186. The block-spread modulation symbols, i.e., the block-spread sequence of complex-valued modulation symbols, is modulated and transmitted. through the DFTS-OFDM symbol or in a DFTS-OFDM symbol duration. However, to allow multiplexing of users the scrambled block of bits s must be transmitted over several DFTS-OFDM symbols to the base station 12.
[0074] G matrix 114 in DFTS-OFDM modulator 113 may vary with cell ID and/or DFTS-OFDM radio frame/subframe/partition/symbol index number due to scrambling code dependency.
[0075] Matrix G can be a product of a diagonal matrix and a DFT matrix. However, instead of a product, we can assume a general matrix G. to randomize interference matrix G may depend on cell ID and/or radio frame/subframe/partition/symbol index DFTS-OFDM number. To be able to decode the transmitted uplink control information signal at the receiver the minimum requirement on G is that its inverse exists.
[0076] A simpler receiver can be constructed if the matrix G is orthogonal since in that case its inverse is just the Hermitian transposition of matrix G depending on the application a low envelope fluctuation of the transmitted signal of uplink control information, average to peak energy ratio, or low cubic metric, may be of interest. In this case the combination of matrix G and subsequent IFFT operation should result in a signal with low cubic metric.
[0077] Such a matrix would be a DFT matrix, whose rows or columns are cyclically shifted, for example, assuming M rows, row 1 becomes row n, row 2 becomes row (n+ 1) mod 1, and so on. This operation results in a cyclic shift of the subcarriers or modulation symbols of complex value mapped, see figure 14 for an illustration. The amount of cyclic shift or cyclic shift pattern may depend on the cell ID and/or radio frame/subframe/partition/symbol index DFTS-OFDM number. Cyclic shifting of subcarriers or modulation symbols of complex value depending on cell ID as well as, or radio frame number/subframe/partition/symbol index DFTS-OFDM randomizes inter-cell interference and decreases inter-cell interference. This improves inter-cell interference reduction compared to prior art PUCCH DFTS-OFDM transmissions. The DFT matrix may, in some embodiments, be the product of a DFT Matrix and a diagonal scrambling matrix.
[0078] A general permutation of rows or columns is also possible; however, cubic metric increases in this case.
[0079] The techniques disclosed here allow, for example, high payload PUCCH transmissions in some embodiments. In addition, these techniques can also provide flexibility to adapt the solution to the required payload. Such techniques are also useful in that they introduce means to improve inter-cell interference. Such means are scrambling with a scrambling code, selecting a matrix G, and/or cyclic shifting matrix elements with a cyclic shifting pattern. Selection of scrambling code c or cyclic shift pattern may depend on cell ID and/or DFTS-OFDM radio frame/subframe/partition/symbol index number in a pseudo random fashion to randomize inter-cell interference. Furthermore, embodiments of the present invention allow varying the PUCCH format structure to exchange payload and/or coding gain and/or inter-cell interference suppression against multiplexing capability.
[0080] Figure 19 is a schematic block diagram representing one embodiment of a transmission process in user equipment 10. A block of bits corresponding to uplink control information is to be transmitted over a radio channel to the base station 12. For example, a number of HARQ feedback bits can be determined by the number of cells configured and transmission mode, eg, component carrier 1 (CC1), CC3: MIMO, CC2: no MIMO. The block of bits may be error correction encoded in an Early Error Correction (FEC) module 191. In addition, the error correction encoded block of bits may then be scrambled in a scrambling bit module 192, which may correspond to bit scrambling module 182 in Fig. 18 . User equipment 10 further comprises a number of Mod0-Mod4 block modules. Each block module comprises a bit-to-symbol mapping module wherein the block of bits is mapped to a sequence of complex-valued modulation symbols. In addition, each Mod0-Mod4 block module comprises a block spread module configured to together block spread the complex value modulation symbol sequence with an oc1 -oc4 spreading sequence, e.g. orthogonal coverage for user equipment to multiplex. In each block module the block spread is just a multiplication by oci, i=0, ... , 4. Mod0-Mod4 block modules together block out the sequence of complex-valued modulation symbols with [oc0, oc1, ... oc4]. Furthermore, the complex-valued modulation symbol block-spreading sequence is transformed by DFTS-OFDM symbol, i.e., each segment of the complex-valued modulation symbol block-spreading sequence is transformed by applying a matrix that depends on de, i.e. varies with, a DFTS-OFDM symbol index and/or partition index. This can be accomplished by first cyclically shifting each segment of the block-spreading sequence of complex-valued modulation symbols, thereby performing a pseudo-random cyclic shift to randomize inter-cell interference. Then, each cyclically shifted segment is processed, eg transformed, into a DFT matrix. The cyclically shifted and DFT transformed segment is then IFFT transformed and the transformed full-value modulation symbol block spreading sequence is transmitted through the DFTS-OFDM symbols or the duration of the DFTS-OFDM symbols.
[0081] Reference signals (RS)s are also transmitted according to a pattern over the duration of the DFTS-OFDM symbol. Each RS is transformed into an IFFT before being transmitted.
[0082] Various embodiments of the present invention include methods of encoding and/or transmitting signaling messages in accordance with the techniques described above, in LTE-advanced or other wireless communication systems. Other modalities include user equipment or other wireless nodes configured to perform one or more of these methods, including mobile stations configured to encode and/or transmit signaling messages in accordance with these techniques, and wireless base stations, for example, e- NodeB's, configured to receive and/or decode transmitted signals according to these signaling methods. Various such embodiments may comprise one or more processing circuits executing stored program instructions to perform the signaling techniques and signaling flows described herein; those skilled in the art will recognize that such processing circuits may comprise one or more microprocessors, microcontrollers or the like, executing program instructions stored in one or more memory devices.
[0083] Of course, those skilled in the art will recognize that the inventive techniques discussed above are not limited to LTE systems or devices having a physical configuration identical to that suggested above, but will recognize that these techniques may be applied to other telecommunication systems and/or to other devices.
[0084] Method steps in user equipment 10 for transmitting uplink control information in time slices in a subframe over a radio channel to radio base station 12 in accordance with some general embodiments will now be described with reference to a flowchart shown in Figure 20. The steps do not have to be taken in the order mentioned below, but can be taken in any appropriate order. The radio channel is arranged to carry uplink control information and the user equipment 10 and base station 12 are comprised of a radio communication network. Uplink control information is comprised of a block of bits. In some embodiments the block of bits corresponds to uplink control information and comprises jointly encoded acknowledgments and acknowledgments. The radio channel can be a PUCCH.
[0085] Step 201. User equipment 10 may in some embodiments, as indicated by the dashed line, error correction code the block of bits. For example, the bit block can be processed with forward error correction or similar.
[0086] Step 202. User equipment 10 may in some embodiments, as indicated by the dashed line, scramble the block of bits before mapping the block of bits to the complex value modulation symbol sequence. The shuffling process is to reduce inter-cell interference and may be cell-specific or similar.
[0087] Step 203. User equipment 10 maps the block of bits to a complex value modulation symbol sequence.
[0088] Step 204. User equipment 10 block spreads the sequence of complex-valued modulation symbols through DFTS-OFDM symbols by applying a spreading sequence to the sequence of complex-valued modulation symbols, to obtain a sequence of block scattering of complex value modulation symbols.
[0089] Step 205. User equipment 10 transforms, per DFTS-OFDM symbol, the block spreading sequence of complex-valued modulation symbols by applying a matrix that depends on a DFTS-OFDM symbol index and/or index from partition the block-scattering sequence of complex-value modulation symbols. In some embodiments, the matrix comprises matrix elements, and the matrix corresponds to a DFT operation together with a row or column cyclic shift operation of the matrix elements. In some alternative embodiments, the matrix comprising matrix elements corresponds to a Discrete Fourier Transform operation together with an operation of shuffling the matrix elements.
[0090] Step 206. The user equipment 10 may in some embodiments, as indicated by the dashed line, modulate OFDM further, by DFTS-OFDM symbol, the block spreading sequence of complex value modulation symbols that has been transformed. For example, the sequence can be transformed in an IFFT process and a cyclic prefix can be added in a cyclic prefix process.
[0091] Step 207. User equipment 10 transmits the complex-value demodulation symbol block spreading sequence that has been transformed over the radio channel to the radio base station 12. In some embodiments the transmission comprises transmitting a first part of the sequence of complex-valued modulation symbols in a first time slice and a second part of the sequence of complex-valued modulation symbols in a second time slice.
[0092] Depending on whether frequency hopping across partition boundaries is applied, other variants can be derived.
[0093] In some embodiments a method at a terminal for transmitting uplink control information in a partition in a subframe over a channel to a base station in a wireless communication system is provided. Uplink control information can be understood in a code word. The terminal maps the codeword to modulation symbols. The terminal then block spreads the modulation symbols across DFTS-OFDM symbols by repeating the modulation symbols for each DFTS-OFDM symbol and applying a block spreading sequence of weighting factors to the repeated modulation symbols, where the repeated modulation symbols include the modulation symbols to which the codeword has been mapped, to obtain a respective weighted copy of the modulation symbols for each DFTS-OFDM symbol. The terminal then transforms, in some embodiments by precoding or modulating DFTS-OFDM, for each DFTS-OFDM symbol, the respective weighted copy of the modulation symbols by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition index to the respective weighted copy of the modulation symbols. Terminal 10 then transmits over, or into/in, each DFTS-OFDM symbol or symbol duration, the respective weighted copy of the modulation symbols that has been transformed at the base station. In alternative embodiments, the codeword may be repeated for each DFTS-OFDM symbol and then the repeated codewords, including the codeword that was repeated, are mapped to modulation symbols, i.e., in such embodiments the repeating and mapping steps of the Block scattering are done in reverse order, and followed by the weighting step.
[0094] The channel can be a physical Uplink Control Channel and the codeword can be a number of bits. Modulation symbols can be QPSK symbols or BPSK symbols. In some embodiments, the block spreading sequence may be an orthogonal sequence. The transformation step may in some embodiments comprise cyclically shifting the matrix, which matrix may be a discrete Fourier Transform matrix.
[0095] To carry out the steps of the above method for transmitting uplink control information in time slots in the subframe over the radio channel to the radio base station 12 the user equipment 10 comprises an arrangement shown in Figure 21. The channel The radio channel may comprise PUCCH or other uplink control radio channels and is arranged to carry uplink control information. As mentioned above, the block of bits may correspond to uplink control information and comprises conjointly encoded acknowledgments and non-acknowledgments.
[0096] In some embodiments the user equipment 10 may comprise an error correction encoding circuit 211 configured to error correction encode the block of bits.
[0097] In addition, the user equipment may comprise a scrambling circuit 212 configured to scramble the block of bits before mapping the block of bits to the complex value modulation symbol sequence.
[0098] User equipment 10 comprises a mapping circuit 213 configured to map the block of bits to the complex value modulation symbol sequence.
[0099] In addition, the user equipment 10 comprises a block spreading circuit 214 configured to block spread the complex-value modulation symbol sequence across DFTS-OFDM symbols by applying a spreading sequence to the sequence of complex-value modulation symbols. complex value modulation, thereby obtaining a block spreading sequence of complex value modulation symbols.
[00100] The user equipment 10 also comprises a transform circuit 215 configured to transform, per DFTS-OFDM symbol, the block spreading sequence of complex value modulation symbols by applying a matrix that depends on a DFTS symbol index - OFDM and/or partition index in complex value modulation symbol block spreading sequence. The matrix may, in some embodiments, comprise matrix elements and correspond to a discrete Fourier Transform operation together with a row or column cyclic shift operation of the matrix elements. The matrix, which may comprise matrix elements, may correspond to a discrete Fourier Transform operation together with a matrix element scrambling operation.
[00101] Additionally, the user equipment 10 comprises a transmitter 217 configured to transmit the complex-value modulation symbol block spreading sequence that has been transformed over the radio channel to the radio base station 12. The transmitter 217 may in some embodiments may be configured to transmit a first part of the complex-valued modulation symbol sequence in a first time slot and a second part of the complex-valued modulation symbol sequence in a second time slot.
[00102] In some embodiments the user equipment 10 further comprises an OFDM modulator 216, which is modified or configured to modulate OFDM, per DFTS-OFDM symbol, the complex-value modulation symbol block spreading sequence that has been transformed. For example, each segment of the complex-valued modulation symbol block spreading sequence into a DFTS-OFDM symbol is transformed by applying the matrix to the segment of the complex-valued modulation symbol block spreading sequence in the transform circuit 215 , and then OFDM modulated in OFDM modulator 216 and transmitted in DFTS-OFDM symbol. Transmitter 217 can be comprised of OFDM modulator 216.
[00103] Embodiments of the present invention for transmitting uplink control information over a radio channel to base radio station 12 may be implemented through one or more processors, as a processing circuit 218 in user equipment 10 depicted in Figure 21, together with computer program code to perform the functions and/or method steps of embodiments of the present invention. The above mentioned program code may also be provided as a computer program product, for example in the form of a data carrier containing computer program code for executing the present solution when being loaded onto user equipment 10. Such carrier it may be in the form of a CD ROM disk. It is, however, workable with other data carriers like a memory stick. Computer program code can additionally be provided as pure program code on a server and downloaded to user equipment 10.
[00104] The user equipment 10 may further comprise a memory 219 configured to be used to store data, scattering sequence, matrix and application to execute the method when being performed on the user equipment 10 and/or the like.
[00105] Method steps at base station 12 for receiving uplink control information in time slices in a subframe over a radio channel from user equipment 10 in accordance with some general embodiments will now be described with reference to a flowchart shown in figure 22. The steps do not have to be taken in the order mentioned below, but can be taken in any appropriate order. The radio channel is arranged to carry uplink control information and the user equipment 10 and base station 12 are comprised of a radio communication network. Uplink control information is comprised of a block of bits. In some embodiments the block of bits corresponds to uplink control information and comprises jointly encoded acknowledgments and acknowledgments. The radio channel can be a PUCCH.
[00106] Step 221. The base station 12 receives a sequence of complex value modulation symbols.
[00107] Step 222. Radio base station 12 demodulates OFDM the complex value modulation symbol sequence.
[00108] Step 223. The radio base station 12 then transforms, per DFTS-OFDM symbol, the OFDM demodulated sequence of complex value modulation symbols by applying a matrix that depends on a DFTS-OFDM symbol index and/or partition for the OFDM demodulated sequence of complex value modulation symbols. This matrix may perform/result in the inverse operation to that of matrix G on user equipment 10. The inverse operation may, in some embodiments, comprise an inverse Discrete Fourier Transform operation, and the matrix inverse to matrix G may comprise a Transform matrix Inverse Discrete Fourier.
[00109] Step 224. Radio base station 12 also block descatters the complex value modulation symbol sequence that has been OFDM demodulated and transformed, with a descattering sequence, as an orthogonal sequence.
[00110] Step 225. The base station 12 maps the complex value modulation symbol descatter sequence that has been OFDM demodulated and transformed, into a block of bits representing the uplink control information.
[00111] In this way, the base station 12 can decode the received uplink control information.
[00112] The method can be performed by a radio base station 12. Fig. 23 is a block diagram of a radio base station 12 for receiving uplink control information in time slots in a subframe over a radio channel at from user equipment 10. The radio channel is arranged to carry uplink control information.
[00113] The radio base station 12 comprises a receiver 231 configured to receive a sequence of complex value modulation symbols and an OFDM demodulation circuit 232 configured to OFDM demodulate the sequence of complex value modulation symbols.
[00114] In addition, the base station 12 comprises a transform circuit 233 configured to transform, per DFTS-OFDM symbol, the OFDM demodulated sequence of complex value modulation symbols by applying a matrix that depends on a DFTS symbol index -OFDM and/or partition index to OFDM demodulated sequence of complex value modulation symbols. This matrix may perform/result in the inverse operation to that of matrix G on user equipment 10. The inverse operation may in some embodiments comprise an inverse Discrete Fourier Transform operation, and the matrix inverse to matrix G may comprise a Discrete Fourier Transform matrix reverse.
[00115] The radio base station 12 also comprises a block despreading circuit 234 configured to block despread the complex value modulation symbol sequence that has been OFDM demodulated and transformed with a despreading sequence.
[00116] In addition, the base station 12 comprises a mapping circuit 235 configured to map the complex value modulation symbol descattering sequence that has been OFDM demodulated and transformed, to a block of bits representing the link control information. ascending.
[00117] Embodiments of the present invention for receiving uplink control information over a radio channel from user equipment 10 may be implemented through one or more processors such as processing circuit 238 in radio base station 12 shown in Figure 23, together with computer program code to perform the functions and/or method steps of embodiments of the present invention. The above mentioned program code may also be provided as a computer program product, for example in the form of a data carrier containing computer program code for executing the present solution when loaded into base station 12. Such carrier it may be in the form of a CD ROM disk. However, it is workable with other data carriers like a memory stick. The computer program code can additionally be provided as pure program code on a server and downloaded to the base station 12.
[00118] The base station 12 may further comprise a memory 239 comprising one or more memory units and configured to be used to store data, spreading sequence, matrix and application to perform the method when performed on the base station 12 and /or similar.
[00119] In the drawings and specification, exemplary embodiments of the present invention have been disclosed. However, many variations and modifications can be made to these modalities without departing substantially from the principles of the modalities. Accordingly, while specific terms are employed, they are used in a generic and descriptive sense only and not for purposes of limitation, the scope of the invention being defined by the following claims.

权利要求:
Claims (16)
[0001]
1. Method in a user equipment (10) for transmitting uplink control information in time slices in a subframe over a radio channel to a radio base station (12), the user equipment (10) and the base station (12) being comprised in a radio communication network, the radio channel of which is arranged to carry uplink control information, and the uplink control information being comprised in a block of bits, the method characterized in that it comprises: mapping (203) the block of bits to a sequence of complex-valued modulation symbols, spreading in block (204) the sequence of complex-valued modulation symbols through Discrete Fourier Transform Spreading symbols - Orthogonal Frequency Division Multiplexing, DFTS-OFDM, applying a spreading sequence to the complex value modulation symbol sequence to obtain a spreading sequence of complex-value modulation symbols, transform (205), per DFTS-OFDM symbol, the complex-value modulation symbol block spreading sequence by performing an operation corresponding to applying, for each DFTS-OFDM symbol, to a part of the block spreading sequence of complex-valued modulation symbols corresponding to the DFTS-OFDM symbol, an array comprising array elements, which array elements are cyclically shifted depending on a DFTS-OFDM symbol index and/or partition, and transmit (207) the complex-value modulation symbol block spreading sequence that has been transformed over the radio channel to the radio base station (12).
[0002]
2. Method, according to claim 1, characterized in that performing the operation that corresponds to applying the matrix comprises performing a Discrete Fourier Transform operation together with a cyclic shift operation.
[0003]
3. Method according to claim 1 or 2, characterized in that it additionally comprises: error correction encoding (201) the block of bits, and scrambling (202) the block of bits before mapping the block of bits to the sequence of complex value modulation symbols.
[0004]
Method according to any one of claims 1 to 3, characterized in that it additionally comprises: modulating OFDM (206), by symbol DFTS-OFDM, the sequence of block spreading of modulation symbols of complex value that has been transformed .
[0005]
Method according to any one of claims 1 to 4, characterized in that the step of transmitting comprises transmitting a first part of the sequence of complex-valued modulation symbols in a first time slot and a second part of the sequence of complex value modulation symbols in a second time slice.
[0006]
6. Method according to any one of claims 1 to 5, characterized in that the block of bits corresponds to uplink control information and comprises jointly encoded acknowledgments and de-acknowledgements.
[0007]
Method according to any one of claims 1 to 6, characterized in that the bit block is a codeword and wherein applying a spreading sequence includes repeating the complex-valued modulation symbols for each DFTS-symbol. OFDM and applying a block spreading sequence of weight factors to the repeated complex-valued modulation symbols and wherein the part of the block-spreading sequence of complex-valued modulation symbols for each DFTS-OFDM symbol is a copy thereof of the complex-valued modulation symbols obtained by applying said spreading sequence.
[0008]
8. Method at a radio base station (12) for receiving uplink control information at time slices in a subframe over a radio channel from a user equipment (10), whose radio channel is arranged to carry information of uplink control, the uplink control information is comprised in a block of bits, and whose user equipment (10) and the radio base station (12) are comprised in a radio communication network, the method characterized by the fact that it comprises: receiving (221) a sequence of complex-valued modulation symbols, demodulating (222) by Orthogonal Frequency Division Multiplexing, OFDM, the sequence of complex-valued modulation symbols, transforming (223), e.g. Discrete Fourier Transform Spreading symbol - Orthogonal Frequency Division Multiplexing, DFTS-OFDM, the complex value modulation symbol sequence that has been OFDM demodulated by performing a operation corresponding to applying, for each DFTS-OFDM symbol, to part of the demodulated sequence of complex-valued modulation symbols corresponding to the DFTS-OFDM symbol, a matrix comprising matrix elements, whose matrix elements are cyclically shifted depending on a DFTS-OFDM symbol index and/or partition index, block-unspread (224) the complex-value modulation symbol sequence that has been OFDM demodulated and transformed with a de-spreading sequence, em-map (225) the symbol de-scatter sequence of complex value modulation that has been OFDM demodulated and transformed, to a block of bits.
[0009]
9. User equipment (10) for transmitting uplink control information in time slices in a subframe over a radio channel to a radio base station (12), whose radio channel is arranged to carry control information from uplink, and the uplink control information being comprised in a block of bits, the user equipment (10) characterized in that it comprises: a mapping circuit (213) configured to map the block of bits to a sequence of complex-valued modulation symbols, a block-spreading circuit (214) configured to block-spread the sequence of complex-valued modulation symbols through Discrete Fourier Transform Scattering - Orthogonal Frequency Division Multiplexing, DFTS symbols -OFDM, applying a spreading sequence to the sequence of complex-value modulation symbols, to obtain a block-spreading sequence of complex value modulation symbols, a transform circuit (215) configured to transform, per DFTS-OFDM symbol, the block spreading sequence of complex value modulation symbols by performing an operation that corresponds to apply, for each DFTS-OFDM symbol OFDM, for part of the block spreading sequence of complex-valued modulation symbols corresponding to the DFTS-OFDM symbol, a matrix comprising matrix elements, which matrix elements are cyclically shifted depending on a DFTS-OFDM symbol index and/or partition index, and a transmitter (217) configured to transmit the complex-value modulation symbol block spreading sequence that has been transformed over the radio channel to the radio base station (12).
[0010]
10. User equipment (10), according to claim 9, characterized in that performing the operation that corresponds to applying the matrix comprises performing a Discrete Fourier Transform operation together with a displacement operation.
[0011]
11. User equipment (10), according to claim 9 or 10, characterized in that it additionally comprises: an error correction coding circuit (211) configured to code by error correction the block of bits, and a scrambling circuit (212) configured to scramble the block of bits before mapping the block of bits to the complex value modulation symbol sequence.
[0012]
12. User equipment (10) according to any one of claims 9 to 11, characterized in that it additionally comprises: an OFDM modulator (216) configured to modulate OFDM, by DFTS-OFDM symbol, the spreading sequence of block of complex value modulation symbols that has been transformed.
[0013]
13. User equipment (10) according to any one of claims 9 to 12, characterized in that the transmitter (217) is configured to transmit a first part of the complex value modulation symbol sequence in a first partition. and a second part of the complex value modulation symbol sequence in a second time slot.
[0014]
14. User equipment (10), according to any one of claims 9 to 13, characterized in that the block of bits corresponds to uplink control information and comprises jointly encoded acknowledgments and non-acknowledgements.
[0015]
15. User equipment (10) according to any one of claims 9 to 14, characterized in that the block of bits is a codeword and wherein applying a spreading sequence includes repeating the complex value modulation symbols for each DFTS-OFDM symbol and apply a block-spreading sequence of weight factors to the repeated complex-valued modulation symbols and wherein the part of the block-spreading sequence of complex-valued modulation symbols for each DFTS- OFDM is a respective weighted copy of complex value modulation symbols obtained by applying said spreading sequence.
[0016]
16. A radio base station (12) for receiving uplink control information in time slots in a subframe over a radio channel from a user equipment (10), whose radio channel is arranged to carry control information from a user equipment (10). uplink, the uplink control information is comprised in a block of bits, and the base station (12) is characterized in that it comprises: a receiver (231) configured to receive a sequence of complex-valued modulation symbols , an Orthogonal Frequency Division Multiplexing, OFDM, demodulation circuit (232) configured to OFDM demodulate the complex value modulation symbol sequence, a transforming circuit (233) configured to transform, per Spread Transform symbol from Discrete Fourier- Orthogonal Frequency Division Multiplexing, DFTS-OFDM, the OFDM demodulation sequence of complex value modulation symbols performing a an operation corresponding to applying, for each DFTS-OFDM symbol, to part of the OFDM demodulated sequence of complex-valued modulation symbols corresponding to the DFTS-OFDM symbol, a matrix comprising matrix elements, whose matrix elements are cyclically shifted depending on a DFTS-OFDM symbol index and/or partition index, a block descattering circuit (234) configured to block descatter the complex value modulation symbol sequence that has been OFDM demodulated and transformed with a descattering sequence, and a mapping circuit (235) configured to map the complex value modulation symbol descattering sequence that has been OFDM demodulated and transformed to a block of bits.

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法律状态:
2018-06-12| B15I| Others concerning applications: loss of priority|

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2018-08-14| B12F| Other appeals [chapter 12.6 patent gazette]|

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2020-05-12| B06U| Preliminary requirement: requests with searches performed by other patent offices: procedure suspended [chapter 6.21 patent gazette]|

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2020-05-12| B15K| Others concerning applications: alteration of classification|Free format text: AS CLASSIFICACOES ANTERIORES ERAM: H04L 5/00 , H04B 1/69 Ipc: H04J 11/00 (2006.01), H04L 5/00 (2006.01), H04W 72 |

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

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2022-02-15| 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 18/01/2011, 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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US29588510P| true| 2010-01-18|2010-01-18|

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US61/295,885|2010-01-18|

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PCT/SE2011/050052|WO2011087448A1|2010-01-18|2011-01-18|Radio base station and user equipment and methods therein|

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