WO2012041099A1

WO2012041099A1 - Method and terminal for transport block retransmission triggered by physical hybrid automatic repeat request (harq) indicator channel

Info

Publication number: WO2012041099A1
Application number: PCT/CN2011/076705
Authority: WO
Inventors: 王瑜新; 郝鹏; 戴博; 梁春丽; 喻斌
Original assignee: 中兴通讯股份有限公司
Priority date: 2010-09-30
Filing date: 2011-06-30
Publication date: 2012-04-05
Also published as: CN101958779B; CN101958779A

Abstract

The present invention discloses a method and terminal for transport block retransmission triggered by a physical hybrid automatic repeat request (HARQ) indicator channel. The retransmission method includes: the terminal precodes the transport blocks to be retransmitted with a defined precoding matrix or vector, wherein the precoding matrix or vector is a precoding matrix or vector predefined according to the precoding matrix or vector indicated by the latest scheduling signaling, or the precoding matrix or vector is selected from a codebook or a precoding matrix set for retransmission; the terminal retransmits the precoded transport blocks. With the technical solutions of the present invention, the transport blocks can be retransmitted effectively in the premise of saving signaling cost.

Description

TECHNICAL FIELD The present invention relates to the field of communications, and in particular to a physical hybrid automatic repeat request request technology.

(Hybrid Automatic Repeat Request, abbreviated as HARQ) A method and terminal for retransmitting a transport block triggered by an indicator channel. BACKGROUND In wireless communication, if multiple antennas are used for transmitting and receiving at both the transmitting end and the receiving end, spatial multiplexing technology can be used to obtain a higher data rate, that is, the same time-frequency resource is used for transmitting at the transmitting end. Multiple data streams can be obtained at the receiving end by channel estimation to obtain a matrix of channel coefficients, and then demodulate the data on each data stream. In the LTE-Advanced Long Term Evolution-Advanced System (LTE-A), in order to obtain a higher data rate, the LTE-A system supports the configuration of the uplink 4 transmit antenna. A single user multiple input multiple output (SU-MIMO) technology is used. At this time, the terminal functions as a transmitting end, and the base station functions as a receiving end, and the transmitting end to the receiving end is in an uplink direction. FIG. 1 is a schematic diagram of a signal processing process of a transmitting end of an SU-MIMO uplink, as shown in FIG. 1 , a terminal uplink signal transmission block (Transport Block, TB for short) 1 to a transmission block K respectively undergo a code modulation module to generate a code word. (codeword) 0~codeword K-1; Codeword 0~codeword K-1 performs codeword-to-layer mapping to obtain layer 0~layer N-1, and performs layered interleaving to perform discrete Fourier transform (distributed Fourier) Transform, abbreviated as DFT) is converted from time i or signal to frequency i or signal; then after frequency i or precoding process, after inverse Fourier transform (IDFT) to time domain Multiple antennas are transmitted. The codeword-to-layer mapping module is used to complete the mapping of the codeword to the layer by using a simple serial/parallel conversion. For details, refer to FIG. 2. 2 is a schematic diagram of a codeword to layer mapping method. The following is an example of two codewords and four transmit antennas to briefly describe the function of the codeword to layer mapping module. When two codewords are mapped to the second layer, the codeword 0 is directly mapped to the first layer, and the codeword 1 is directly mapped to the second layer; when two codewords are mapped to the third layer, the codeword 0 is directly mapped to the first layer. Layer, codeword 1 is mapped to layer 2 and layer 3 after serial/parallel conversion; when 2 codewords are mapped to layer 4, codeword 0 is mapped to layer 1 and layer 2 by serial-to-parallel conversion. Codeword 1 is mapped to Layer 3 and Layer 4 by serial-to-parallel conversion. The precoding module is configured to complete layer-to-antenna mapping, convert the processing of the antenna domain into a beam domain for processing, and perform preprocessing operations using known spatial channel information at the transmitting end, thereby further improving user and system throughput. In the LTE system, a physical downlink control channel (PDCCH) is used to carry uplink and downlink scheduling information, and uplink power control information. The format of the Downlink Control Information (DCI) is divided into the following types: DCI format 0, 1, 1A, 1B, 1C, 1D, 2, 2A, 3, 3A, etc., where format 0 The physical downlink shared channel (PDSCH) is used to indicate the scheduling of the Physical Uplink Shared Channel (PUSCH). The DCI format 1 , 1A, IB , 1C is used for the Physical Downlink Shared Channel (PDSCH). Different transmission modes; DCI format 2, 2A for different transmission modes of space division multiplexing; DCI format 3, 3A for physical uplink control channel (PUCCH) and PUSCH power control commands transmission.

LTE-A uses a precoding technique based on a codebook (codebook), which is a type of channel status information (CSI). A technique for performing pre-processing to improve the performance of a multi-antenna system. One way for the transmitter to acquire CSI is through feedback from the receiver. In order to reduce the feedback overhead, the general method is to save the same codebook (codebook) at the receiving end and the transmitting end, that is, the precoding matrix set. The receiving end selects a suitable precoding matrix in the codebook according to the current channel condition, and feeds back the index value (PMI) in the set back to the transmitting end, and the transmitting end uses the precoding matrix of the feedback. The index finds the precoding matrix and precodes the transmitted signal. The mathematical model of data precoding is _y = H 3⁄4 + W , where y is the received signal vector, H is the channel coefficient matrix, W is the precoding matrix, s is the signal vector, and n is the noise vector. For the 2 transmit antenna terminals of LTE-A, the precoding matrix shown in Table 1 is used; for the terminals of the 4 transmit antennas, the precoding matrix shown in Table 2, Table 3, and Table 4 is used, and 4 transmit antennas are 4 layers. The precoding matrix is

The codebook used for spatial multiplexing of the uplink 2 transmit antennas (or for antenna port 0,

1 transmission codebook)

Codebook index number Antenna space multiplexing layer

1 2

1 T 1 "1 0"

0

1 0 1 1 to 1

1

7 - 1

1 "Γ

2

7 - person

1 one 1

3 -

--- ]

1 'ι

4

0

1 "ο"

5

1 The codebook used when the uplink multiplexing antenna spatial multiplexing layer is 1 (or the transmission codebook used for the antenna ports 0, 1, 2, 3 and the spatial multiplexing layer is 1)

The codebook used when the uplink 4 transmit antenna spatial multiplexing layer is 2 (or the transmission codebook used for the antenna ports 0, 1, 2, 3 and the spatial multiplexing layer 2)

Codebook

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0

1 1 0 1 1 0 1 — j 0 1 —J 0 1 -1 0 1 -1 0 1 j 0 1 j 0 Index number 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1 2 0 1

0 to 7

0 j 0 0 1 0 -1 0 0 j 0 1 0 -1

1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Index number 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1 1 0 1

8 to 15 2 1 0 2 1 0 2 -1 0 2 -1 0 2 0 1 2 0 -1 2 0 1 2 0 -1

0 1 0 -1 0 1 0 -1 1 0 1 0 -1 0 -1 0 The codebook used when the uplink 4 transmit antenna spatial multiplexing layer is 3 (or used for days) Transmission codebook with line ports 0, 1, 2, 3 and spatial multiplexing layer 3)

For the uplink data transmission, the LTE-A system supports Hybrid Automatic Repeat Request (HARQ). „ HARQ 4 ten retransmits each transport block, and the sender responds from the receiver. Feedback signaling for TB blocks, if confirmed

(Acknowledgement, abbreviated as ACK) message, indicating that the receiving end has correctly received the data, and the transmitting end can send new data at this time; if the feedback signaling is Negative Acknowledgement (NACK), it indicates that the receiving end The data is not received correctly and the transmitter is required to resend the data. When two transport blocks are transmitted at the same time, each transport block will have corresponding modulation and coding mode and redundancy version, new data indication and other DCI control information, and the new data indicator bit is used to distinguish the transmitted transmission block from being the first. The new transport block sent in the second time is also the old transport block that is retransmitted. Under the current HARQ retransmission mechanism, when the last transmitted TB block transmits one transmission error correctly, the retransmission can prohibit the transmission of the correct TB block that was transmitted last time, and only retransmit the erroneous TB block. The TB block is changed from the original two to one, and the subsequent codeword-to-layer mapping changes accordingly. The precoding matrix also changes when the precoding module is passed. However, if the base station triggers a retransmission through a Physical Hybrid ARQ indicator channel (PHICH), the base station does not have a signaling indicating which PMI the terminal uses, and what precoding matrix is used by the terminal for precoding, which is a solved problem. SUMMARY OF THE INVENTION The present invention is directed to a related art in which a base station triggers a retransmission through a physical HARQ indicator channel, and the base station does not have a signaling indicating which PMI the terminal uses, and what precoding matrix is used by the terminal for precoding. The main purpose of the present invention is to provide a physical HARQ indicator channel triggering transmission. The retransmission method and terminal of the input block are to solve at least one of the above problems. According to an aspect of the present invention, a method for retransmitting a transport block triggered by a physical hybrid automatic repeat request (HARQ indicator channel) is provided, including: pre-preserving a transport block to be retransmitted by a terminal using a preset precoding matrix or vector Encoding, where the precoding matrix or vector is a precoding matrix or vector predefined according to a precoding matrix or vector indicated by the latest scheduling signaling, or the precoding matrix or vector is selected from a codebook for retransmission Or a precoding matrix set; the terminal retransmits the precoded transport block. Setting the precoding matrix according to a precoding matrix or vector indicated by the latest scheduling signaling includes: the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel and the most recent transmission process with scheduling signaling When the number of transport blocks is equal, the number of retransmission layers is set to be the same as the number of layers indicated by the latest scheduling signaling, and the precoding matrix is set to be the same as the precoding matrix indicated by the latest scheduling signaling. Setting the precoding matrix according to a precoding matrix or vector indicated by the latest scheduling signaling includes: when the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the latest transmission with scheduling signaling When the number of transport blocks of the procedure, the precoding matrix or vector currently used for the transport block to be retransmitted is set according to the precoding matrix or vector indicated by the most recent scheduling signaling. Setting the precoding matrix or vector currently used for the transport block to be retransmitted includes: selecting a precoding matrix or vector from the codebook or precoding matrix set for retransmission as the current transmission for retransmission The precoding matrix or vector of the block. When the terminal supports a maximum of two transmit antennas, setting the precoding matrix includes one of the following: setting a designated precoding matrix in the uplink 2 transmit antenna layer 1 codebook as a precoding matrix used in current retransmission. And sequentially multiplexing one precoding matrix in all or part of the precoding matrix of the uplink 2 transmit antenna 1 layer codebook as the precoding matrix used for each retransmission. The above specified precoding

The above uplink 2 emission and

When the above terminal supports up to 4 transmit antennas and the most recent transmission process with scheduling signaling is used When the 2-layer precoding matrix is pre-coded, setting the precoding matrix includes one of the following: setting a precoding matrix for retransmission to a matrix of 4 rows and 1 column, wherein the matrix includes the nearest band The kth column non-zero element of the 2 layer precoding matrix of the uplink 4 transmit antenna used in the transmission process with scheduling signaling, k is the index number 1 or 2 of the transport block to be retransmitted; Selecting a precoding matrix as the precoding matrix of the set in the codebook, wherein the selected precoding matrix and the uplink 4 transmit antenna 2 layer precoding matrix used in the latest transmission process with scheduling signaling The kth column vector has the smallest chord giant. When the terminal supports a maximum of four transmit antennas and the most recent transmission process with scheduling signaling uses a 3-layer precoding matrix for precoding, setting the precoding matrix includes: if the transport block to be retransmitted is the first 1 transport block, the precoding matrix used for retransmission is set to a matrix of 4 rows and 1 column, wherein the matrix contains the first column of the 3-layer precoding matrix used in the transmission process with the latest scheduling signaling. Or a non-zero element; or selecting a precoding matrix from the uplink 4 transmit antenna layer 1 codebook as the set precoding matrix, wherein the selected precoding matrix is used by the most recent transmission process with scheduling signaling The first column vector of the 3-layer precoding matrix has a minimum chord distance; if the transport block to be retransmitted is the second transport block, the precoding matrix used for retransmission is set to a matrix of 4 rows and 2 columns. The matrix includes the second column and the third column non-zero elements of the 3-layer precoding matrix used in the transmission process with the latest scheduling signal; or one pre-selected from the uplink 4 transmit antenna layer 2 codebook coding a precoding matrix as the set, wherein the selected precoding matrix is composed of a second column vector and a third column vector of a 3-layer precoding matrix used by a recent transmission process with scheduling signaling The matrix has the smallest chords. When the above terminal supports a maximum of 4 transmit antennas and the most recent transmission process with scheduling signaling is precoded using a 4-layer precoding matrix, setting the precoding matrix includes one of the following:

1 0 1 0

1 0 1 -1 0 One of the precoding matrix sets is the precoding matrix of the set: 丄 ,

0 1 2 0 1

0 1 0 -1

— 1 0 - — 1 0— 1 0 — — 1 0 — — 1 0— 1 0 — 1 0―

1 1 0 1 0 1 1 0 1 1 0 -1 1 0 1 1 0 1 1 0 -1

, , , , , , ,

2 0 -1 2 1 0 2 -1 0 2 1 0 2 0 1 2 0 -1 2 0 1

0 -1 0 1 0 -1 0 -1 1 0 -1 0 -1 0 sequentially loops one precoding matrix of the three precoding matrices of the precoding matrix set as a precoding matrix used for each retransmission . When the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the nearest band When there is a number of transport blocks of the transmission process of scheduling signaling, a precoding matrix or vector is selected from the codebook or precoding matrix set for retransmission to set the precoding matrix, where the retransmission matrix is used The codebook or precoding matrix set is composed of one or more matrices. When the codebook or precoding matrix set used for retransmission consists of one matrix, the precoding matrix is fixedly used during retransmission, when the precoding code When the plurality of matrices are composed, the plurality of precoding matrices are sequentially used in a plurality of retransmissions. When the terminal supports a maximum of two transmit antennas, one or more matrices are selected from the uplink 2 transmit antenna layer code matrix to form a retransmission codebook or precoding matrix with a multiplexing layer number of 1 for antenna ports ₀ and 1. The set includes one of the following: one, two, three, four, five or six precoding matrices are selected from the uplink 2 transmit antenna 1 layer codebook to form the complex for the antenna port 0, 1 And using a retransmission codebook or a precoding matrix set with a layer number of 1, wherein the precoding matrix in the layer 2 codebook of the uplink 2 transmit antenna includes: an index of 0, an index of 1, an index of 2, and an index of 3 The precoding matrix with an index of 4 and an index of 5. Selecting one, two, three or four precoding matrices from the uplink 2 transmit antenna layer 1 codebook to form the retransmission codebook or precoding for the antenna port 0, 1 with a multiplexing layer number of 1. The matrix set, including: one of the uplink 2 transmit antenna 1 layer codebooks

Forming the codebook or precoding matrix set for retransmission; or constructing the codebook or precoding matrix set for retransmission in the uplink 2 transmit antenna layer 1 codebook; or transmitting 2 uplink days

Codebook or precoding moment for retransmission described in line 1 codebook

Group set; or will be

The codebook or precoding matrix set for retransmission - when the terminal supports up to 4 transmit antennas, the retransmission code for the spatial multiplexing layer of antenna ports 0, 1, 2, 3 is 1. The set of the precoding matrix or the precoding matrix includes one of the following: one, two, three, four, five, six, seven, eight, nine or nine from the uplink 4 transmit antenna layer 1 codebook 10 precoding matrices constituting the retransmission codebook or the precoding matrix set of the multiplex layer number of the antenna port 0, 1, 2, 3, wherein the uplink 4 transmit antenna layer 1 codebook The precoding matrix includes: a precoding matrix with an index of 0, an index of 1, an index of 2, an index of 3, an index of 4, an index of 8, an index of 12, an index of 13, an index of 14, and an index of 15. Selecting one, two, three or four precoding matrices from the uplink 4 transmit antenna layer 1 codebook to form the retransmission code for the antenna port 0, 1, 2, 3 and having a multiplexing layer of 1. This includes: Will go up 4 1 1 1 1 1 1 1 1 Transmitting antenna 1 layer codebook 1 1 , 1 1 , 1 1 , 1 1 , 1 j , 1 -1 , 1 1 , 1 -1

2 1 2 j 2 -1 2 -j 2 1 2 1 2 1 2 1

One of -1 j 1 -jj 1 1 -1 constitutes the codebook or precoding matrix set for retransmission; or transmits uplink 4

Antenna 1 layer codebook

2 of the codebooks or precoding matrix sets for retransmission; or up 4

Transmitting antenna 1 layer codebook

3 of the codebook or precoding matrix set for retransmission; or 4 uplinks

4 of the codebook or precoding matrix set for retransmission ₍

When the terminal supports up to 4 transmit antennas, the retransmission codebook or precoding matrix set for the spatial multiplexing layer of antenna ports 0, 1, 2, 3 is 2, including one of the following: One, two, three, four, :, six, seven, eight, nine, or ten precoding matrices are selected from the antenna 2 layer codebook for the antenna port 0, 1 2 And a retransmission codebook or a precoding matrix set of 2, wherein the precoding matrix in the layer 2 codebook of the uplink 4 transmit antenna includes: an index of 0, an index of 1, and an index of 2 , index is 3, index is 4, index is 8, index is 12, index a precoding matrix of 13, index 14 and index 15 - one, two, three or four precoding matrices selected from the uplink 4 transmit antenna 2 layer codebook are used for antenna port 0, 1 The retransmission codebook or the precoding matrix set with 2, 3, and 2 multiplex layer layers includes: The uplink 4 transmit antenna 2 layer codebook

1 0

One of -1 0 constitutes the codebook or precoding matrix set for retransmission; or the uplink 4 transmit antenna

0 1

0 -1

2 of the 2 layer codebooks

1 0 The codebook or precoding matrix set for retransmission; or the uplink 4 transmit antenna 丄 0 1 in the 2 layer codebook

2 1 0 0 1

According to another aspect of the present invention, a terminal is provided, comprising: a precoding module, configured to precode a transport block to be retransmitted with a preset precoding matrix, wherein the precoding matrix or vector is based on a recent Precoding matrix or vector pre-defined by precoding matrix or vector indicated by scheduling signaling, or precoding matrix or vector selected from codebook or precoding matrix set for retransmission; retransmission module, set to heavy Pass the precoded transport block. The terminal further includes: a first setting module, configured to preset according to the latest scheduling signaling The precoding matrix is set by an encoding matrix or vector. The terminal further includes: a second setting module, configured to: select a precoding matrix or a vector from the codebook or precoding matrix set for retransmission to set the precoding matrix, where the recoding matrix is used The codebook or precoding matrix set is composed of one or more matrices. When the codebook or precoding matrix set for retransmission consists of one matrix, the precoding matrix is fixedly used during retransmission; When the codebook or precoding matrix set for retransmission is composed of a plurality of matrices, the plurality of precoding matrices are sequentially cyclically used in multiple retransmission processes. According to the present invention, the terminal pre-codes the transport block to be retransmitted by using the preset precoding matrix, wherein the precoding matrix indicated by the latest scheduling signaling (the latest grant) sets the precoding matrix, or is selected according to the selected one. The precoding matrix is set in the precoding matrix or vector of the retransmitted codebook or precoding matrix set; the terminal retransmits the precoded transport block. The problem that the base station triggers retransmission through the physical HARQ indicator channel in the related art, the base station does not have signaling to indicate which PMI the terminal uses, and what precoding matrix is used by the terminal for precoding, thereby saving signaling overhead. Under the premise, the effective retransmission of the transport block is implemented. Other features and advantages of the invention will be set forth in the description which follows, and The objectives and other advantages of the invention will be realized and attained by the <RTI BRIEF DESCRIPTION OF THE DRAWINGS The accompanying drawings, which are set to illustrate,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,, In the accompanying drawings: FIG. 1 is a schematic diagram of signal processing of a transmitting end of an uplink SU SU-MIMO in the related art; FIG. 2 is a schematic diagram of a codeword-to-layer mapping method; FIG. 3 is a physical HARQ indicator according to an embodiment of the present invention; FIG. 4 is a structural block diagram of a terminal according to an embodiment of the present invention; and FIG. 5 is a structural block diagram of a terminal in a preferred embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS It should be noted that the embodiments in the present application and the features in the embodiments may be combined with each other without conflict. The invention will be described in detail below with reference to the drawings in conjunction with the embodiments. 3 is a flow chart of a method for retransmitting a transport block triggered by a physical HARQ indicator channel according to an embodiment of the present invention. As shown in FIG. 3, the method for retransmitting a transport block triggered by a physical HARQ indicator channel according to an embodiment of the present invention includes the following processing: Step S302: The terminal uses a preset precoding matrix or vector to pre-transmit the transport block to be retransmitted. Encoding, wherein the precoding matrix or vector is a precoding matrix or vector predefined according to a precoding matrix or vector indicated by a recent schedule grant, or the precoding matrix or vector is selected from The transmitted codebook or precoding matrix set. Step S304: The terminal retransmits the pre-coded transport block. In the related art, the base station triggers retransmission through the physical HARQ indicator channel, and the base station does not indicate which PMI the terminal uses, and the terminal cannot know the precoding matrix of the transport block to be retransmitted. Using the method provided by the present invention, the precoding matrix or vector pre-defined by the precoding matrix or vector indicated by the latest scheduling signaling is set as a precoding matrix for the transport block to be retransmitted, or used from The retransmitted codebook or precoding matrix set is selected for the precoding matrix of the transport block to be retransmitted, and the effective retransmission of the transport block can be realized under the premise of saving signaling overhead. Preferably, based on the first setting idea, the precoding matrix or the vector setting precoding matrix indicated by the latest scheduling signaling mainly has the following two cases: First: when triggered by the physical HARQ indicator channel When the number of retransmission transport blocks is equal to the number of transport blocks of the most recent transmission process with scheduling signaling, the number of retransmission layers is set to be the same as the number of layers indicated by the latest scheduling signaling, and the precoding matrix is set with the nearest one. The precoding matrix indicated by the scheduling signaling is the same. For example, when two transport blocks were transmitted last time and both were transmitted incorrectly, if you need to retransmit the two transport blocks, you can set the number of retransmission layers to be the same as the number of layers transmitted last time, and set the precoding matrix and the nearest one. The precoding matrix indicated by the scheduling signaling is the same. Second: when the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the number of transport blocks of the most recent transmission procedure with scheduling signaling, according to the precoding matrix indicated by the latest scheduling signaling or The vector sets the precoding matrix or vector currently used for the transport block to be retransmitted. Preferably, in the second case, the precoding matrix or vector indicated by the latest scheduling signaling indicates that the precoding matrix or vector currently used for the transport block to be retransmitted may include the following processing: The precoding matrix or vector of the retransmitted codebook or precoding matrix set is used as the precoding matrix or vector currently used for the transport block to be retransmitted. Preferably, in the second case, when the terminal supports a maximum of two transmit antennas, setting the precoding matrix may include one of the following:

(1) Set one precoding matrix in the uplink layer 2 transmit antenna layer 1 codebook to the precoding matrix used in the current retransmission. Preferably, the matrix is

(2) Cycling all or part of the precoding matrix in the uplink 2 transmit antenna 1 layer codebook as the precoding matrix used for each retransmission. Preferably, the partial precoding matrix in the first two-day 1-layer codebook may include:

The above preferred embodiment will be described below with reference to Example 1. Example 1 When the terminal supports a maximum of two transmit antennas, set a fixed precoding matrix in the uplink transmit antenna 1 layer codebook to the precoding matrix used in the current retransmission. Preferably, the precoding

Or cycle through the three precoding moments in multiple retransmissions

Preferably, in the second case, when the terminal supports at most 4 transmit antennas and the latest transmission process with scheduling signaling uses a 2-layer precoding matrix for precoding, setting the precoding matrix may include one of the following: :

(1) setting a precoding matrix for retransmission to a matrix of 4 rows and 1 column, wherein the matrix packet The kth column non-zero element of the 2 layer precoding matrix of the uplink 4 transmit antenna used in the transmission process with the latest scheduling signaling, k is the index number 1 or 2 of the transport block to be retransmitted;

(2) selecting a precoding matrix from the uplink 4 transmit antenna layer 1 codebook as the set precoding matrix, wherein the selected precoding matrix and the latest uplink transmit antenna 2 used in the transmission process with scheduling signaling 2 The kth column vector of the layer precoding matrix has the smallest chord. The above preferred embodiments are described below in connection with Example 2. Example 2 When the terminal supports up to 4 transmit antennas and uses the 2-layer precoding matrix for precoding in the most recent transmission process with scheduling signaling, if the retransmission is the kth transport block or the kth codeword ( If k is 1 or 2), the precoding matrix at the time of retransmission is set to a matrix of 4 rows and 1 column, which matrix contains the kth column of the 2 layer precoding matrix used in the latest transmission process with scheduling signaling. a non-zero element, or the matrix is selected from a precoding matrix in a codebook used when the number of spatial multiplexing layers of the uplink 4 transmit antenna is 1, and the precoding matrix is used in the transmission process with the latest scheduling signaling The kth column vector of the 2-layer precoding matrix has the smallest chord. For example, if k is 1, the retransmission codebook of the first transport block or codeword when the number of layers of the antenna port {0, 1, 2, 3} is 1 is as shown in Table 5 (where the first pass) The number of multiplexing layers is 2), or the retransmission codebook is a subset of Table 5. For example, if k is 2, the retransmission codebook of the second transport block or codeword when the number of layers of the antenna port {0, 1, 2, 3} is 1 is as shown in Table 6 (wherein the first pass) The number of multiplexing layers is 2), or the retransmission codebook is a subset of Table 6. table 5

Table 6

Preferably, in the second case, when the terminal supports at most 4 transmit antennas and the most recent transmission process with scheduling signaling is precoded using a 3-layer precoding matrix, setting the precoding matrix may include the following processing:

(1) If the transport block to be retransmitted is the first transport block, set the precoding used for retransmission. The matrix is a matrix of 4 rows and 1 column, wherein the matrix contains the first column non-zero elements of the 3-layer precoding matrix used in the transmission process with the latest scheduling signaling; or the transmitting layer 1 layer code from the uplink 4 A precoding matrix is selected as the precoding matrix, wherein the selected precoding matrix has the smallest chirp size of the first column vector of the 3-layer precoding matrix used in the transmission process with the latest scheduling signaling. ;

(2) If the transport block to be retransmitted is the second transport block, set the precoding matrix used for retransmission to a matrix of 4 rows and 2 columns, where the matrix contains the most recent transmission process with scheduling signaling. The second column and the third column of the 3-layer precoding matrix are non-zero elements; or a precoding matrix is selected from the uplink 4 transmit antenna 2 layer codebook as a set precoding matrix, wherein the selected precoding matrix The matrix consisting of the 2nd column vector and the 3rd column vector of the 3-layer precoding matrix used in the recent transmission process with scheduling signaling has the smallest chord. The above preferred embodiment will be described below in connection with Example 3. Example 3 When the terminal supports up to 4 transmit antennas and uses the 3-layer precoding matrix for precoding in the most recent transmission process with scheduling signaling, if the first transport block or codeword is retransmitted, the weight is set. The precoding matrix of the transmission time is a matrix of 4 rows and 1 column, and the matrix contains the first column non-zero elements of the 3-layer precoding matrix used in the transmission process with the latest scheduling signaling, or the matrix is selected from the uplink 4 a precoding matrix in the codebook used when the number of spatial multiplexing layers of the transmitting antenna is 1, and the first column of the 3-layer precoding matrix used in the transmission process with the latest scheduling signaling The vector has the smallest chord; if the second transmission block or codeword is retransmitted, the precoding matrix at the time of retransmission is set to a matrix of 4 rows and 2 columns, and the matrix contains the latest with scheduling signaling. The second column and the third column of the 3-layer precoding matrix used in the transmission process are non-zero elements, or the matrix is selected from a precoding matrix in the codebook used when the number of spatial multiplexing layers of the uplink 4 transmit antenna is 2. And the precoding matrix and the nearest band Second layer matrix 3 and the third column vector of the precoding matrix column vector transmission scheduling signaling used consisting of a chord having the smallest giant. For example, the retransmission codebook of the first transport block or codeword when the number of multiplex layers of the antenna port {0, 1, 2, 3} is 1 is as shown in Table 7 (the number of multiplex layers in the first transmission is 3) ), or retransmit the codebook as a subset of Table 7. For example, the retransmission codebook of the second transport block or codeword when the number of multiplex layers of the antenna port {0, 1, 2, 3} is 1 is as shown in Table 8 (the number of multiplex layers in the first transmission is 3) ), or retransmit the codebook as a subset of Table 8. Table 7

Preferably, in the second case, when the terminal supports at most 4 transmit antennas and the most recent transmission process with scheduling signaling is precoded using a 4-layer precoding matrix, setting the precoding matrix may include one of the following: 1 0

1 0

(1) Set one of the following precoding matrix sets to the set precoding matrix:

0 1

0 1 1 0 - — 1 0 - — 1 0— 1 0 — — 1 0 — — 1 0— 1 0―

1 -1 0 1 1 0 1 0 1 1 0 1 1 0 -1 1 0 1 1 0 1

, , , , , , ,

2 0 1 2 0 -1 2 1 0 2 -1 0 2 1 0 2 0 1 2 0 -1

0 -1 0 -1 0 1 0 -1 0 -1 1 0 -1 0

1 0

0 — 1

0 1

-1 0

(2) sequentially looping one of the three precoding matrices of the precoding matrix set as the precoding matrix used for each retransmission. The above preferred implementation process will be described below in connection with Example 4. Example 4 When the terminal supports up to 4 transmit antennas and uses it in the most recent transmission process with scheduling signaling.

1 0

When the 10 0 layer precoding matrix is precoded, the precoding matrix at the time of retransmission is set to

2 0 1 0 1 1 0 - — 1 0 - — 1 0— 1 0 — — 1 0 — — 1 0— 1 0―

1 - 1 0 1 1 0 1 0 1 1 0 1 1 0 - 1 1 0 1 1 0 1

, , , , , , ,

2 0 1 2 0 - 1 2 1 0 2 - 1 0 2 1 0 2 0 1 2 0 - 1

0 - 1 0 - 1 0 1 0 - 1 0 - 1 1 0 - 1 0

1 0

0 — 1

One of the nine matrices is fixed, or in the course of multiple retransmissions,

0 1

— 1 0

One of the three precoding matrices is used as a precoding matrix for each retransmission. In a preferred implementation, based on the second setup idea, when the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the number of transport blocks of the most recent transmission process with scheduling signaling, Selecting a precoding matrix or vector from a codebook or precoding matrix set for retransmission to set a precoding matrix, wherein the codebook or precoding matrix set for retransmission consists of one or more matrices, when used When the retransmitted codebook or precoding matrix set is composed of one matrix, the precoding matrix is fixedly used in retransmission. When the precoding codebook is composed of multiple matrices, it is cyclically used in multiple retransmission processes. Precoding matrices. In a preferred implementation, when the terminal supports a maximum of two transmit antennas, one or more matrixes are selected from a codebook of a codebook corresponding to the number of antennas supported by the terminal to form a complex for antenna ports 0 and 1. The retransmission codebook or the precoding matrix set with the layer number of 1 includes: selecting one, two, three, four, five or six precoding matrices from the uplink 2 transmit antenna layer 1 codebook to constitute the above The retransmission codebook or the precoding matrix set of the multiplex layer 1 of the antenna port 0, 1 is used, wherein the precoding matrix selected in the layer 2 codebook of the uplink 2 transmit antenna includes: an index of 0, an index of 1. A precoding matrix with an index of 2, an index of 3, an index of 4, and an index of 5. . Preferably, selecting one precoding matrix from the uplink 2 transmit antenna 1 layer codebook to form a retransmission codebook or a precoding matrix set for the antenna port 0, 1 of the multiplexing layer number 1 may further include the following processing: Will be in the uplink 2 transmit antenna 1 layer codebook

a codebook or precoding matrix set for retransmission; preferably, two precoding matrices are selected from the uplink 2 transmit antenna layer 1 codebook to form a multiplexing layer of 1 for antenna ports 0, 1. The retransmission codebook or the precoding matrix set may further include the following processing: using the component in the uplink 2 transmit antenna layer 1 codebook for retransmission of the codebook or preamble

Preferably, a retransmission codebook or a precoding matrix set having a multiplexing layer number of 1 for antenna ports 0, 1 may be further selected by selecting 3 precoding matrices from the uplink 2 transmit antenna 1 layer codebook. The following processing is included: The component in the uplink 2 transmit antenna layer 1 codebook is used for retransmission

a codebook or precoding matrix set; preferably, four precoding matrices are selected from the uplink 2 transmit antenna layer 1 codebook to form a retransmission codebook or precoding for the antenna port 0, 1 with a multiplexing layer number of 1. The matrix set may further include the following processing: The uplink 2 transmit antenna 1 layer codebook

, Compose a codebook or precoding matrix set for retransmission. The above preferred implementation process will be described below in connection with Example 5. Example 5: When the terminal supports a maximum of two transmit antennas, the precoding code used for the terminal retransmission transport block is a subset of the uplink 2 transmit antenna layer 1 codebook;

In a preferred implementation process, when the terminal supports a maximum of four transmit antennas, one or more matrixes are selected from one codebook of the codebook corresponding to the maximum number of supported antennas of the terminal for antenna ports 0, 1, and 2. The retransmission codebook or the precoding matrix set having a spatial multiplexing layer of 1 and 3 includes: one, two, three, four, five, and one from the uplink four-shot antenna antenna layer codebook. 6, 6, 8, 9, or 10 precoding matrices constitute the above-mentioned retransmission codebook or precoding matrix set for antenna port 0, 1, 2, 3 with spatial multiplexing layer number of 1, The optional precoding matrix in the uplink layer 4 transmit antenna layer 1 codebook includes: an index of 0, an index of 1, an index of 2, an index of 3, an index of 4, an index of 8, an index of 12, and an index of 13 , the index is 14, the index is 15 precoding matrix. Preferably, one precoding matrix is selected from the uplink 4 transmit antenna 1 layer codebook to form a retransmission codebook or precoding matrix set for the antenna port 0, 1, 2, 3 and the spatial multiplexing layer number is 1. further 1 1 1 1 1 includes the following processing: 上行1 1 , 1 1 , 1 1 , 1 1 , 1 j in the 1st codebook of the uplink 4 transmit antenna

2 1 2 j 2 - 1 2 - j 2 1

- 1 j 1 - jj one of the codebook or precoding matrix set for retransmission;

Preferably, two precoding matrices are selected from the uplink 4 transmit antenna layer 1 codebook to form a retransmission codebook or a precoding matrix set for the antenna port 0, 1, 2, 3 and the spatial multiplexing layer number is 1. Further including the following processing: the uplink 4 transmit antenna 1 layer codebook

2 of the components used to retransmit the codebook or pre-

Preferably, the three precoding matrices are selected from the uplink 4 transmit antenna 1 layer codebook to form a retransmission codebook or preamble with a spatial multiplexing layer of 1 for antenna ports 0, 1, 2, 3 The coding matrix set can be further

3 of the codebooks or pre-codes for retransmission

a code matrix set; preferably, four precoding matrices are selected from the uplink 4 transmit antenna 1 layer codebook to form a retransmission codebook or preamble with a spatial multiplexing layer of 1 for antenna ports 0, 1, 2, 3 The coding matrix set may further include the following processing: placing the uplink 4 transmit antenna in the layer 1 codebook

1 1 1 1 1 1

4 components of 1 j , 1 -1 , 1 1 , 1 -1 , 1 -j , 1 -j , or pre-coded for retransmission

2 1 2 1 2 1 2 1 2 1 2 -j

j 1 1 -1 -j 1

Set of code matrices. The above preferred implementation process will be described below in connection with Example 6. Example 6 When the terminal supports a maximum of four transmit antennas, the precoding codebook with the spatial multiplexing layer number of 1 for the terminal retransmission transport block is the codebook used when the spatial multiplexing layer of the uplink 4 transmit antenna is 1. a subset of, or a predefined codebook;

composition;

Preferably, m is 2, and the codebook for retransmission is matrix

Any two of them;

Preferably, the codebook for retransmission is matrix

Any of the three components;

1 1 1 1 1 1 Preferably, the codebook for retransmission consists of a matrix 丄1 1 , 1 1 , 1 1 , 1 1 , 1 j , 1 - 1

2 1 2 j 2 - 1 2 - j 2 1 2 1

- any composition of 1 j 1 - jj 1;

In a preferred implementation process, when the terminal supports a maximum of four transmit antennas, one or more matrixes are selected from one codebook of the codebook corresponding to the maximum number of supported antennas of the terminal for antenna ports 0, 1, and 2. The spatial multiplexing layer of 3, the 2 retransmission codebook or the precoding matrix set may include the following processing: 1 , 2, 3, 4, and 5 are selected from the uplink 4 transmit antenna 2 layer codebook. , 6, 7, 8, 9, or 10 precoding matrices constituting the above-mentioned spatial multiplexing layer for antenna ports 0, 1, 2, 3 is a 2 retransmission codebook or a precoding matrix set, where The precoding matrix in the 2 layer codebook of the uplink 4 transmit antenna includes: an index of 0, an index of 1, an index of 2, an index of 3, an index of 4, an index of 8, an index of 12, an index of 13, and an index of 14. A precoding matrix with an index of 15. Preferably, selecting one precoding matrix from the uplink 4 transmit antenna 2 layer codebook to form the spatial multiplexing layer for the antenna ports 0, 1, 2, 3 is 2 retransmission codebook or precoding matrix set can further Including the following processing: the uplink 4 transmit antenna 2 layer codebook

1 0

- 1 0 constitutes a codebook or precoding matrix set for retransmission;

0 1

0 - 1 Preferably, two precoding matrices are selected from the uplink 4 transmit antenna 2 layer codebook, and the spatial multiplexing layer for antenna ports 0, 1, 2, 3 is 2 retransmission codebook or precoding matrix. Set can be further packaged

Preferably, three precoding matrices are selected from the uplink 4 transmit antenna 2 layer codebook, and the number of spatial multiplexing layers for antenna ports 0, 1, 2, 3 is 2 retransmission codebooks or precoding matrix sets can be further package

Preferably, four precoding matrices are selected from the uplink 4 transmit antenna 2 layer codebook, and the number of spatial multiplexing layers for the antenna ports 0, 1, 2, 3 is 2 retransmission codebooks or precoding matrix sets can be further package

The above preferred implementation process will be described below in connection with Example 7. Example 7 When the terminal supports a maximum of four transmit antennas, the precoding codebook used for the terminal retransmission transport block with a spatial multiplexing layer of 2 is the codebook used when the uplink 4 transmit antenna spatial multiplexing layer is 2. a subset of, or a predefined codebook;

Preferably,

1 0

- 2 matrixes in 1 0;

0 1

0 - 1

Preferably,

1 0

- 3 matrixes in 1 0;

0 1

0 - 1

Preferably, the codebook used for retransmission is matrix

1 0

- 4 matrixes in 1 0;

0 1

0 - 1 FIG. 4 is a structural block diagram of a terminal according to an embodiment of the present invention. As shown in FIG. 4, a terminal according to an embodiment of the present invention includes: a precoding module 40 and a retransmission module 42. The precoding module 40 is configured to precode the transport block to be retransmitted with the set precoding matrix or vector, wherein the precoding matrix or vector is pre-coded according to the precoding matrix or vector indicated by the latest scheduling signaling. The defined precoding matrix or vector, or the precoding matrix or vector is selected from the codebook or precoding matrix set for retransmission; the retransmission module 42 is configured to retransmit the precoded transport block. Setting a precoding matrix or vector predefined according to a precoding matrix or vector indicated by the latest scheduling signaling as a precoding matrix for the transport block to be retransmitted, or from a codebook for retransmission or The precoding matrix set is selected for the precoding matrix of the transport block to be retransmitted. The above terminal, using the set pre- The coding matrix pre-codes and transmits the transport block that needs to be retransmitted, which can implement effective retransmission of the transport block under the premise of saving signaling overhead. Preferably, as shown in FIG. 5, the foregoing terminal may further include: a first setting module 44, configured to set the precoding matrix according to a precoding matrix or a vector indicated by the latest scheduling signaling to the preset precoding matrix. Preferably, as shown in FIG. 5, the foregoing terminal may further include: a second setting module 46, configured to select a precoding matrix or a vector from a codebook or a precoding matrix set for retransmission to set a precoding matrix, where The codebook or precoding matrix set used for retransmission consists of one or more matrices. When the codebook or precoding matrix set used for retransmission consists of one matrix, the precoding matrix is fixedly used during retransmission. When the codebook or precoding matrix set used for retransmission consists of multiple matrices, multiple precoding matrices are sequentially used in multiple retransmissions. It should be noted that the preferred working manners of the above-mentioned modules in combination with each other can be specifically referred to the example one to the seventh embodiment, and are not mentioned here. In summary, according to the foregoing embodiment of the present invention, a method and a terminal for transmitting a transport block triggered by a physical HARQ indicator channel are provided, which are predefined according to a precoding matrix or a vector indicated by a recent scheduling signaling. The precoding matrix or vector is set to be used for the precoding matrix of the transport block to be retransmitted, or the precoding matrix for the transport block to be retransmitted is selected from the codebook or precoding matrix set for retransmission, which can save The effective retransmission of the transport block is implemented under the premise of signaling overhead. Obviously, those skilled in the art should understand that the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device, or they may be separately fabricated into individual integrated circuit modules, or they may be Multiple modules or steps are made into a single integrated circuit module. Thus, the invention is not limited to any specific combination of hardware and software. The above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the scope of the present invention are intended to be included within the scope of the present invention.

Claims

A physical hybrid automatic repeat request HARQ indicator channel triggered transport block retransmission method, including:

The terminal pre-codes the transport block to be retransmitted with a preset precoding matrix or vector, wherein the precoding matrix or vector is a precoding predefined according to a precoding matrix or vector indicated by the latest scheduling signaling. a matrix or vector, or the precoding matrix or vector is selected from a codebook or precoding matrix set for retransmission;

The terminal retransmits the precoded transport block.

2. The method according to claim 1, wherein setting the precoding matrix according to a precoding matrix or vector indicated by a recent scheduling signaling comprises:

When the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is equal to the number of transport blocks of the most recent transmission process with scheduling signaling, setting the retransmission layer and the layer indicated by the latest scheduling signaling The numbers are the same, and the precoding matrix is set to be the same as the precoding matrix indicated by the latest scheduling signaling.

3. The method according to claim 1, wherein setting the precoding matrix according to a precoding matrix or vector indicated by a recent scheduling signaling comprises:

When the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the number of transport blocks of the most recent transmission procedure with scheduling signaling, according to the precoding matrix or vector setting indicated by the latest scheduling signaling The precoding matrix or vector currently used for the transport block to be retransmitted.

4. The method according to claim 3, wherein setting a precoding matrix or vector currently used for a transport block to be retransmitted comprises:

A precoding matrix or vector from the codebook or precoding matrix set for retransmission is selected as the precoding matrix or vector currently used for the transport block to be retransmitted.

The method according to claim 3 or 4, wherein, when the terminal supports a maximum of two transmitting antennas, setting the precoding matrix includes one of the following:

Setting a predetermined precoding matrix in the uplink 2 transmit antenna layer 1 codebook as a precoding matrix used in current retransmission; A precoding matrix in all or part of the precoding matrix of the uplink 2 transmit antenna 1 layer codebook is sequentially cycled as a precoding matrix used for each retransmission.

6. The method according to claim 5, wherein the specified precoding matrix is

The method according to claim 5, wherein the partial precoding matrix in the layer 2 codebook of the uplink 2 transmit antenna comprises:

The method according to claim 3 or 4, wherein the pre-setting is set when the terminal supports a maximum of four transmitting antennas and the most recent transmission process with scheduling signaling uses a 2-layer precoding matrix for precoding The coding matrix includes one of the following:

The precoding matrix for retransmission is set to a matrix of 4 rows and 1 column, wherein the matrix includes the kth of the 2 uplink coding antenna 2 layer precoding matrix used by the latest transmission process with scheduling signaling a non-zero element, k is an index number 1 or 2 of the to-be-retransmitted transport block; a precoding matrix is selected from the uplink 4 transmit antenna 1 layer codebook as the set precoding matrix, wherein the selection The precoding matrix has the smallest chord distance from the kth column vector of the uplink 4 transmit antenna 2-layer precoding matrix used in the most recent transmission process with scheduling signaling.

The method according to claim 3 or 4, wherein the pre-setting is set when the terminal supports a maximum of four transmitting antennas and the most recent transmission process with scheduling signaling is pre-encoded using a 3-layer precoding matrix. The coding matrix includes:

If the transport block to be retransmitted is the first transport block, set the precoding matrix used for retransmission to a matrix of 4 rows and 1 column, where the matrix contains the most recent transmission process with scheduling signaling. The first column of the 3-layer precoding matrix used is a non-zero element; or a precoding matrix is selected from the uplink 4 transmit antenna 1 layer codebook as the set precoding matrix, wherein the selected precoding matrix is The first column vector of the 3-layer precoding matrix used in the recent transmission process with scheduling signaling has the smallest chord;

If the transport block to be retransmitted is the second transport block, set the precoding matrix used for retransmission to a matrix of 4 rows and 2 columns, where the matrix includes the most recent transmission process with scheduling signaling. The second and third columns of the 3-layer precoding matrix used are non-zero elements; or Selecting, in the uplink 4 transmit antenna 2 layer codebook, a precoding matrix as the set precoding matrix, wherein the selected precoding matrix and the nearest 3-layer precoding matrix used in the transmission process with scheduling signaling The matrix consisting of the second column vector and the third column vector has the smallest chord. The method according to claim 3 or 4, wherein the precoding is set when the terminal supports a maximum of 4 transmitting antennas and the most recent transmission process with scheduling signaling is precoded using a 4-layer precoding matrix The matrix includes one of the following:

Setting one of the following precoding matrix sets to the set precoding matrix:

— 1 0— 1 0 — — 1 0 — — 1 0— 1 0 — — 1 0―

1 1 0 1 -1 0 1 1 0 1 0 1 1 0 1 1 0 -1

, , , , , ,

2 0 1 2 0 1 2 0 -1 2 1 0 2 -1 0 2 1 0

0 1 0 -1 0 -1 0 1 0 -1 0 -1

One of the three precoding matrices of the precoding matrix set is sequentially cycled as a precoding matrix used for each retransmission.

11. The method according to claim 1, wherein, when the number of transport blocks to be retransmitted triggered by the physical HARQ indicator channel is less than the number of transport blocks of the most recent transmission process with scheduling signaling, The codebook or precoding matrix for retransmission selects a precoding matrix or vector to set the precoding matrix, where the codebook or precoding matrix set for retransmission consists of one or more matrices When the codebook or precoding matrix set used for retransmission consists of one matrix, the precoding matrix is fixedly used during retransmission, and when the precoding codebook is composed of multiple matrices, during multiple retransmissions The plurality of precoding matrices are sequentially cycled.

12. The method according to claim 11, wherein when the terminal supports a maximum of two transmit antennas, one or more matrices are selected from the uplink 2 transmit antenna layer codebook for multiplexing of antenna ports 0, 1. A retransmission codebook or precoding matrix set with a layer number of 1, including one of the following:

Selecting 1, 2, 3, 4, 5, or 6 precoding matrices from the uplink 2 transmit antenna 1 layer codebook to form the weight of the multiplexing layer for antenna port 0, 1 is 1. a codebook or a precoding matrix set, where the precoding matrix in the layer 2 codebook of the uplink 2 transmit antenna Including: a precoding matrix with an index of 0, an index of 1, an index of 2, an index of 3, an index of 4, and an index of 5.

The method according to claim 12, wherein one, two, three or four precoding matrices are selected from the uplink 2 transmit antenna layer 1 codebook to form the complex for antenna port 0, 1. Using a retransmission codebook or a precoding matrix set with a layer number of 1, including: placing an uplink 2 transmit antenna in a layer 1 codebook

One of the codebooks or precoding matrix sets for retransmission; or the composition of the uplink 2 transmit antenna layer 1 codebook for retransmission

a codebook or precoding matrix set; or

Uplink 2 transmit antenna

Composing the codebook or precoding matrix set for retransmission; or the uplink 2 transmit antenna 1 layer codebook.

The codebook or precoding matrix set for retransmission is composed.

The method according to claim 11, wherein the retransmission codebook or precoding for the spatial multiplexing layer of the antenna ports 0, 1, 2, 3 is 1 when the terminal supports at most 4 transmitting antennas. A matrix set, including one of the following:

Select one, two, three, four, five, six, seven, eight, nine, or ten precoding matrices from the uplink 4 transmit antenna layer 1 codebook to form the antenna port. 0, 1, 2, 3, a retransmission codebook or a precoding matrix set with a multiplexing layer number of 1, wherein the precoding matrix in the layer 4 codebook of the uplink 4 transmit antenna includes: an index of 0, an index of 1. The precoding matrix with index 2, index 3, index 4, index 8, index 12, index 13, index 14 and index 15.

The method according to claim 14, wherein one, two, three or four precoding matrices are selected from the uplink 4 transmit antenna layer 1 codebook to form the antenna port 0, 1, 2 The retransmission codebook with a multiplexing layer of 1 and 3 includes: 1 1 1 1 1

1 1 , 1 1 , 1 1 , 1 1 , 1 j

2 1 2 j 2 - 1 2 - j 2 1

- 1 j 1 - jj one of the codebooks or pre-forms for retransmission

Coding matrix set; or

Will be in the uplink 4 transmit antenna 1 layer codebook

2 of the components of the codebook for retransmission

Or a precoding matrix set; or

Will be in the uplink 4 transmit antenna 1 layer codebook

3 of the codebooks used for retransmission or

Precoding matrix set; or

Will be in the uplink 4 transmit antenna 1 layer codebook

4 of the codebooks used for retransmission or

Precoding matrix set. The method according to claim 11, wherein, when the terminal supports a maximum of four transmitting antennas, the retransmission codebook or precoding matrix set for the spatial multiplexing layer of antenna ports 0, 1, 2, 3 is 2. , including one of the following:

Select one, two, three, four, five, six, seven, eight, nine, or ten precoding matrices from the uplink 4 transmit antenna layer 2 codebook to form the antenna port. 0, 1, 2, 3, a retransmission codebook or a precoding matrix set of 2, wherein the precoding matrix in the 2 layer codebook of the uplink 4 transmit antenna includes: an index of 0, an index of 1. The precoding matrix with index 2, index 3, index 4, index 8, index 12, index 13, index 14 and index 15. The method according to claim 16, wherein one, two, three or four precoding matrices are selected from the uplink 4 transmit antenna 2 layer codebook to form the antenna port 0, 1, 2, 3 The retransmission codebook or precoding matrix set with a multiplexing layer of 2 includes:

1

2 of the 1 constitute the codebook or precoding matrix set for retransmission; or

0

1 0

- 3 of the codebooks or precoding matrix sets for retransmission; or

0 1

0 - 1

18. A terminal, including:

a precoding module, configured to precode a transport block to be retransmitted with a preset precoding matrix, wherein the precoding matrix or vector is predefined according to a precoding matrix or vector indicated by a latest scheduling signaling Precoding matrix or vector, or the precoding matrix or vector is selected from a codebook or precoding matrix set for retransmission;

The retransmission module is configured to retransmit the precoded transport block.

The terminal according to claim 18, further comprising:

The first setting module is configured to set the precoding matrix according to a precoding matrix or vector indicated by the latest scheduling signaling.

The terminal according to claim 18, further comprising:

a second setting module, configured to select a precoding matrix or a vector from the codebook or precoding matrix set for retransmission to set the precoding matrix, where the codebook or precoding for retransmission The matrix set is composed of one or more matrices. When the codebook or precoding matrix set for retransmission consists of one matrix, the precoding matrix is fixedly used during retransmission; when the retransmission is used for When the codebook or precoding matrix set is composed of a plurality of matrices, the plurality of precoding matrices are sequentially used in a plurality of retransmission processes.