EP-4742568-A1 - METHOD FOR TRANSMITTING PRECODING MATRIX, AND COMMUNICATION APPARATUS

EP4742568A1EP 4742568 A1EP4742568 A1EP 4742568A1EP-4742568-A1

Abstract

This application provides a precoding matrix transmission method and a communication apparatus, to reduce overheads for feeding back channel information and reduce power consumption of a terminal device. The method includes: A terminal device receives first configuration information, where the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups includes a plurality of antenna ports, and K is a positive integer; and the terminal device sends precoding matrix indicator PMI information, where the PMI information indicates v groups of parameters, and any one of the v groups of parameters includes at least one first parameter, where the at least one first parameter corresponds to at least one of P groups of channel information, the P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1.

Inventors

CHEN, LEI
YAN, Mao
LIU, Fengwei
QIU, JING

Assignees

Huawei Technologies Co., Ltd.

Dates

Publication Date: 20260513
Application Date: 20240823

Claims (20)

A precoding matrix transmission method, comprising: receiving first configuration information, wherein the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups comprises a plurality of antenna ports, and K is a positive integer; and sending precoding matrix indicator PMI information, wherein the PMI information indicates v groups of parameters, and any one of the v groups of parameters comprises at least one first parameter, wherein the at least one first parameter corresponds to at least one of the P groups of channel information, the P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1.
The method according to claim 1, further comprising: receiving second configuration information, wherein the second configuration information is used to configure uplink transmission resources corresponding to the K port groups; and sending, based on the second configuration information, an uplink reference signal on the uplink transmission resources corresponding to the K port groups.
The method according to claim 1 or 2, further comprising: receiving information indicating a value of P; or receiving index set information indicating the P groups of channel information.
A precoding matrix transmission method, comprising: sending first configuration information, wherein the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups comprises a plurality of antenna ports, and K is a positive integer; and receiving precoding matrix indicator PMI information, wherein the PMI information indicates v groups of parameters, and any one of the v groups of parameters comprises at least one first parameter, wherein the at least one first parameter corresponds to at least one of the P groups of channel information, the P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1.
The method according to claim 4, further comprising: sending second configuration information, wherein the second configuration information is used to configure uplink transmission resources corresponding to the K port groups; receiving an uplink reference signal on the uplink transmission resources corresponding to the K port groups, and determining P' groups of channel information based on the received uplink reference signal, wherein P' is a positive integer less than or equal to P; and performing transmission of downlink data based on the PMI and/or the P' groups of channel information.
The method according to claim 4 or 5, further comprising: sending information indicating a value of P; or sending index set information indicating the P groups of channel information.
The method according to any one of claims 1 to 6, wherein the any one of the v groups of parameters further comprises a common parameter combination corresponding to the P groups of channel information, wherein the common parameter combination comprises one or more of the following parameters: second parameter W 1 , third parameter W f H , and fourth parameter W̃ 2 , the PMI information is used to determine v groups of precoding matrices, any one of the v groups of precoding matrices comprises a precoding matrix corresponding to each of the P groups of channel information, and a precoding matrix W numbered p in a group of precoding matrices numbered l in the v groups of precoding matrices satisfies the following relational expression: W = W 1 × A p , l × W ˜ 2 × W f H ; or W = A p , l × W 1 × W ˜ 2 × W f H , wherein A p,l represents an identity matrix or a first parameter that corresponds to a group of channel information numbered p in the P groups of channel information and that is comprised in a group of parameters numbered l in the v groups of parameters, p is an integer less than or equal to P, l is an integer less than or equal to v, and different values of p correspond to different A p,l .
The method according to any one of claims 1 to 6, wherein the any one of the v groups of parameters further comprises one or more of the following parameters: second parameter W 1 , third parameter W f H , and fourth parameter W̃ 2 , the PMI information is used to determine v groups of precoding matrices, any one of the v groups of precoding matrices comprises a precoding matrix corresponding to each of the P groups of channel information, and a precoding matrix W numbered p in a group of precoding matrices numbered l in the v groups of precoding matrices satisfies the following relational expression: W = W 1 × A p , l × W ˜ 2 × W f H ; or W = A p , l × W 1 × W ˜ 2 × W f H , wherein A p,l represents an identity matrix or a first parameter that corresponds to a group of channel information numbered p in the P groups of channel information and that is comprised in a group of parameters numbered l in the v groups of parameters, p is an integer less than or equal to P, l is an integer less than or equal to v, and different values of p correspond to different A p , l .
The method according to claim 7 or 8, wherein A p,l is determined based on F coefficients, F is an integer greater than 1, and a value of F is determined based on the value of P or a quantity of antenna ports comprised in one of the K port groups.
The method according to claim 9, wherein the F coefficients comprise a first part of coefficients and a second part of coefficients, wherein the first part of coefficients are the same as the second part of coefficients, and the PMI information indicates the first part of coefficients or the second part of coefficients; or the second part of coefficients are determined based on the first part of coefficients and a first coefficient, and the PMI information indicates the first part of coefficients and the first coefficient.
The method according to claim 9, wherein a value of one of the F coefficients is one of J values, and the PMI information indicates the J values; or the F coefficients comprise a first part of coefficients and a second part of coefficients, a value of a coefficient in the first part of coefficients is one of J values, the second part of coefficients are determined based on a second coefficient and the first part of coefficients, and the PMI information comprises the J values and the second coefficient, wherein J is a positive integer less than or equal to F.
The method according to claim 11, wherein a value of J corresponds to a quantity of sub port groups comprised in one port group.
The method according to any one of claims 1 to 12, wherein a parameter comprised in the any one of the v groups of parameters is determined based on a codebook parameter combination, the codebook parameter combination comprises one or more of the following parameters: quantity L of beams, factor p υ of a quantity of vectors, and factor β of a quantity of non-zero elements, and a value of at least one parameter in the codebook parameter combination is determined based on the value of P.
The method according to any one of claims 1 to 13, wherein the first configuration information is further used to configure Q groups of coefficients, Q is greater than K, Q groups of channel information determined based on the Q groups of coefficients and K groups of channel information comprise the P groups of channel information, and the K groups of channel information are determined based on the downlink reference signal on the downlink transmission resources corresponding to the K port groups.
The method according to any one of claims 1 to 10, wherein K is greater than 1, K groups of channel information are determined based on the downlink reference signal on the downlink transmission resources corresponding to the K port groups, the K groups of channel information comprise the P groups of channel information, and P is less than or equal to K.
A communication apparatus, comprising a processing module, a receiving unit, and a sending unit, wherein the receiving unit is configured to receive first configuration information, wherein the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups comprises a plurality of antenna ports, and K is a positive integer; and the sending unit is configured to send precoding matrix indicator PMI information under control of the processing module, wherein the PMI information indicates v groups of parameters, and any one of the v groups of parameters comprises at least one first parameter, wherein the at least one first parameter corresponds to at least one of the P groups of channel information, the P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1.
The apparatus according to claim 16, wherein the receiving unit is further configured to receive second configuration information, wherein the second configuration information is used to configure uplink transmission resources corresponding to the K port groups; and the processing module is further configured to send, based on the second configuration information, an uplink reference signal on the uplink transmission resources corresponding to the K port groups.
The apparatus according to claim 16 or 17, wherein the receiving unit is further configured to: receive information indicating a value of P; or receive index set information indicating the P groups of channel information.
A precoding matrix transmission apparatus, comprising a processing module, a sending unit, and a receiving unit, wherein the sending unit is configured to send first configuration information under control of the processing module, wherein the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups comprises a plurality of antenna ports, and K is a positive integer; and the receiving unit is configured to receive precoding matrix indicator PMI information, wherein the PMI information indicates v groups of parameters, and any one of the v groups of parameters comprises at least one first parameter, wherein the at least one first parameter corresponds to at least one of the P groups of channel information, the P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1.
The apparatus according to claim 19, wherein the sending unit is further configured to send second configuration information, wherein the second configuration information is used to configure uplink transmission resources corresponding to the K port groups; the receiving unit is further configured to receive an uplink reference signal on the uplink transmission resources corresponding to the K port groups; and the processing module is further configured to: determine P' groups of channel information based on the received uplink reference signal, wherein P' is a positive integer less than or equal to P; and perform transmission of downlink data based on the PMI and/or the P' groups of channel information.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS This application claims priority to Chinese Patent Application No. 202311086557.7, filed with the China National Intellectual Property Administration on August 25, 2023 and entitled "PRECODING MATRIX TRANSMISSION METHOD AND COMMUNICATION APPARATUS", which is incorporated herein by reference in its entirety. TECHNICAL FIELD This application relates to the field of communication technologies, and in particular, to a precoding matrix transmission method and a communication apparatus. BACKGROUND In a hybrid beamforming (Hybrid beamforming, HBF) scenario, a network device may select directions of a plurality of analog beams, and deliver, on different analog beams, pilot signals for channel estimation. For a terminal device, a process in which the network device selects an analog beam is referred to as beam training or beam sweeping. Currently, the network device allocates different pilot resources to different analog beams, and the terminal device measures pilot signals based on the different pilot resources and feeds back measurement results. However, the network device can select only one analog beam at a same moment, that is, the pilot signals corresponding to the different analog beams can be sent only in a time-division manner, reducing communication efficiency. In addition, as more analog beams are selected, the terminal device needs to measure more pilot resources, and feedback overheads are higher, increasing power consumption of the terminal device. SUMMARY This application provides a precoding matrix transmission method and a communication apparatus, to reduce overheads for feeding back channel information by a terminal device side and reduce power consumption of a terminal device. According to a first aspect, an embodiment of this application provides a precoding matrix transmission method, applied to a terminal device and including: receiving first configuration information, where the first configuration information is used to configure downlink transmission resources corresponding to K port groups, each of the K port groups includes a plurality of antenna ports, and K is a positive integer; and sending precoding matrix indicator PMI information, where the PMI information indicates v groups of parameters, and any one of the v groups of parameters includes at least one first parameter and a common parameter combination corresponding to P groups of channel information. The at least one first parameter corresponds to at least one of the P groups of channel information, where for example, the at least one first parameter is in one-to-one correspondence with the at least one of the P groups of channel information. The P groups of channel information are determined based on a downlink reference signal received on the downlink transmission resources corresponding to the K port groups, v is a positive integer, and P is an integer greater than 1. In such a design, joint feedback for a plurality of groups of channel information is implemented, that is, the plurality of groups of channel information are fed back simultaneously, to reduce overheads for feeding back channel information by a terminal device side and reduce power consumption of the terminal device. In a possible design, the method further includes: receiving second configuration information, where the second configuration information is used to configure uplink transmission resources corresponding to the K port groups; and sending, based on the second configuration information, an uplink reference signal on the uplink transmission resources corresponding to the K port groups. The uplink reference signal may be used by a network device to perform channel estimation, to obtain channel information for supplementing the PMI information, thereby improving communication performance of subsequent downlink data transmission. In a possible design, a value of P may be indicated by a network device to the terminal device. For example, the method further includes: receiving information indicating the value of P; or receiving index set information indicating the P groups of channel information. In a possible design, the common parameter combination includes one or more of the following parameters: second parameter W1, third parameter WfH, and fourth parameter W̃2, the PMI information is used to determine v groups of precoding matrices, any one of the v groups of precoding matrices includes a precoding matrix corresponding to each of the P groups of channel information, and a precoding matrix W numbered p in a group of precoding matrices numbered l in the v groups of precoding matrices satisfies the following relational expression: W=W1×Ap,l×W˜2×WfH; or W=Ap,l×W1×W˜2×WfH. Ap,l represents a preset matrix or a first parameter that corresponds to a group of channel information numbered p in the P groups of channel information and that is included in a group of parameters numbered l in the v groups of parameters, p is an integ