Communication method and apparatus

Patent metadata

Field	Value
Publication number	US-12537720-B2
Application number	US-202418764828-A
Country	US
Kind code	B2
Filing date	Jul 5, 2024
Priority date	Jan 6, 2022
Publication date	Jan 27, 2026
Grant date	Jan 27, 2026

Abstract

A communication method includes a first device that determines channel state information based on a first frame that is used for channel measurement and that is sent by a second device, performs conjugate transpose and QR decomposition to obtain a matrix R and a matrix Q, and sends, to the second device, the matrix Q indicating attribute information of a target path.

First claim

What is claimed is:

1 . A method implemented by a first device, the method comprising:
receiving, from a second device, a first frame for channel measurement; obtaining, based on the first frame, channel state information (CSI), wherein a dimension of the CSI is N r ×N t ×K, wherein N r is a first quantity of first antennas of the first device, wherein N t is a second quantity of second antennas of the second device, wherein K is a third quantity of subcarriers that carry the first frame, and wherein N r , N t , and K are all positive integers; performing a conjugate transpose and a QR decomposition on the CSI to obtain an upper right triangular matrix R and a matrix Q, wherein in first L rows of the upper right triangular matrix R, at least one first row comprises positive or negative values of first elements on a first corresponding diagonal that are consistent in a subcarrier dimension and at least one second row comprises positive or negative values of second elements on a second corresponding diagonal that are consistent in a sample dimension, wherein L is a fourth quantity of target paths between the first device and the second device, wherein a sample comprises pieces of the CSI based on times of the channel measurement in a time dimension, the sample dimension corresponds to the pieces of the CSI, and wherein the matrix Q indicates attribute information of a target path; and sending, to the second device, the matrix Q.

2 . The method of claim 1 , the matrix Q or a first matrix based on at least one column of the matrix Q is a unitary matrix.

3 . The method of claim 1 , the attribute information comprises one or more of a delay of the target path, an angle of departure (AOD) of the target path, or a Doppler shift of the target path.

4 . The method of claim 1 , wherein performing the conjugate transpose and the QR decomposition on the CSI comprises:
obtaining a first location and a second location, the first location is of a third element that is in the first L rows and that comprises the positive or negative values of the first elements, and the second location is of a fourth element that is in the first L rows and that comprises the positive or negative values of the second elements; and further performing, based on the first location and the second location the conjugate transpose and the QR decomposition on the CSI.

5 . The method of claim 4 , wherein obtaining the first location and the second location comprises:
receiving, from the second device, first information regarding the first location and second information regarding the second location; identifying that the first location and the second location are predefined; or defining the first location and the second location.

6 . The method of claim 4 , further comprising sending, to the second device, first information regarding the first location and second information regarding the second location.

7 . The method of claim 1 , wherein before receiving the first frame from the second device, the method further comprises:
sending, to the second device, first indication information indicating whether the first device supports one or more of the following feedbacks:
first feedback of a first compressed beamforming matrix based on subcarrier dimension consistency; or
second feedback of a second compressed beamforming matrix based on sample dimension consistency.

8 . The method of claim 7 , the first indication information is located in one or more a sensing capability field of an association request frame, a core capabilities field of an enhanced directional multi-gigabit (EDMG) sensing capability field, or an optional subelements field of the EDMG sensing capability field.

9 . The method of claim 1 , wherein before receiving the first frame, the method further comprises:
receiving, from the second device, indication information indicating whether the second device supports one or more of the following feedbacks:
first feedback of a first compressed beamforming matrix based on subcarrier dimension consistency; or
second feedback of a second compressed beamforming matrix based on sample dimension consistency.

10 . The method of claim 9 , the indication information is located in one or more of a first sensing capability field of an association response frame, a second sensing capability field of a beacon frame, a core capabilities field of an enhanced directional multi-gigabit (EDMG) sensing capability field, or an optional subelements field of an of the EDMG sensing capability field.

11 . A method implemented by a second device, the method comprising:
sending, to a first device, a first frame for channel measurement; receiving, from the first device based on the first frame, a matrix Q that is based on channel state information (CSI), the matrix Q indicates attribute information of a target path, and the target path is between the first device and the second device; obtaining a first location and a second location, the first location is of a first element that is in first L rows of a matrix R and that comprises positive or negative values of second elements on a first corresponding diagonal that are consistent in a subcarrier dimension, the second location is of a third element that is in the first L rows and that comprises positive or negative values of fourth elements on a second corresponding diagonal that are consistent in a sample dimension, and wherein L is a fourth quantity of target paths; and performing, based on the matrix Q, the first location and the second location, target path sensing.

12 . The method of claim 11 , the matrix Q or a first matrix based on at least one column of the matrix Q is a unitary matrix.

13 . The method of claim 11 , wherein a dimension of the CSI is N r ×N t ×K, wherein N r is a first quantity of first antennas of the first device, wherein N t is a second quantity of second antennas of the second device, wherein K is a third quantity of subcarriers that carry the first frame, and wherein N r , N t , and K are all positive integers.

14 . The method of claim 13 , the attribute information comprises one or more of a delay of the target path, an angle of departure (AOD) of the target path, or a Doppler shift of the target path.

15 . A first device comprising:
a memory configured to store instructions; and one or more processors coupled to the memory and configured to execute the instructions to cause the first device to:
receive, from a second device, a first frame for channel measurement;
obtain, based on the first frame, channel state information (CSI), wherein a dimension of the CSI is N r ×N t ×K, wherein N r is a first quantity of first antennas of the first device, wherein N t is a second quantity of second antennas of the second device, wherein K is a third quantity of subcarriers that carry the first frame, and wherein N r , N t , and K are all positive integers;
perform a conjugate transpose and a QR decomposition on the CSI to obtain an upper right triangular matrix R and a matrix Q, wherein in first L rows of the upper right triangular matrix R, at least one first row comprises positive or negative values of first elements on a first corresponding diagonal that are consistent in a subcarrier dimension and at least one second row comprises positive or negative values of second elements on a second corresponding diagonal that are consistent in a sample dimension, wherein L is a fourth quantity of target paths between the first device and the second device, wherein a sample comprises pieces of the CSI based on times of the channel measurement in a time dimension

Assignees

• Huawei Tech Co Ltd

Inventors

• Du Rui
• Han Xiao
• Hu Mengshi
• Yang Xun

Classifications

• H04L5/0098

  Signalling of the activation or deactivation of component carriers, subcarriers or frequency bands · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title

• H04L25/0242 Primary

  using matrix methods · CPC title

• H04W76/14

  Direct-mode setup · CPC title

• H04L1/0026 Primary

  Transmission of channel quality indication · CPC title