Method and apparatus for uplink signal precoding and reporting

Patent metadata

Field	Value
Publication number	US-2025373299-A1
Application number	US-202318876338-A
Country	US
Kind code	A1
Filing date	Jun 27, 2023
Priority date	Jun 27, 2022
Publication date	Dec 4, 2025
Grant date	—

Abstract

This disclosure provides a method, an apparatus, and a non-transitory computer-readable medium for wireless communication. In the method, a reference signal is sent from a first device to a second device. The reference signal is used for channel state information (CSI) measurement of a channel between the first device and the second device. A CSI report is received at the first device from the second device. The CSI report indicates a transmit precoder matrix indicator (TPMI) that indicates one of a plurality of precoder matrices. A to-be-transmitted signal is precoded based on the one of a plurality of precoder matrices indicated by the TPMI. Each of the plurality of precoder matrices is able to be used for up to 8-layer transmission.

First claim

What is claimed is:

1 . A method for wireless communication at a first device, comprising:
sending, to a second device, a reference signal for channel state information (CSI) measurement of a channel between the first device and the second device; receiving, from the second device, a CSI report indicating a transmit precoder matrix indicator (TPMI) that indicates one of a plurality of precoder matrices; and precoding a to-be-transmitted signal based on the one of a plurality of precoder matrices indicated by the TPMI, where each of the plurality of precoder matrices is able to be used for up to 8-layer transmission.

2 . The method of claim 1 , wherein the first device is equipped with 8 antenna ports for transmission, the 8 antenna ports being grouped into a single panel or multiple panels.

3 . The method of claim 2 , wherein the 8 antenna ports are fully coherent to each other.

4 . The method of claim 1 , wherein the plurality of precoder matrices is classified into three matrix sets each corresponding to one of three codebook modes 1-3, each matrix set including 8 columns of precoder matrices.

5 . The method of claim 4 , wherein in each matrix set, column 1 defines a general structure, column 2 adds a 180° phase shift for inter-polarization co-phasing values with respect to column 1, column 3 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 1, column 4 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 2, column 5 adds a 90° phase shift for inter-polarization co-phasing values with respect to column 1, column 6 adds a −90° phase shift for inter-polarization co-phasing values with respect to column 1, column 7 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 5, and column 8 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 6.

6 . The method of claim 4 , wherein N g represents a number of antenna panels that antenna ports of the UE are grouped into, codebook mode 1 includes N g co-phasing values, codebook mode 2 includes 4N g −3 co-phasing values, and codebook mode 3 includes 2N g −1 co-phasing values.

7 . The method of claim 6 , wherein the CSI report is a dual-stage report including a first stage report indicating slow-changing indices that are reported with low periodicity and a second stage report indicating fast-changing indices that are reported with high periodicity.

8 . The method of claim 7 , wherein codebook mode 1 includes N g −1 inter-panel co-phasing values that are indicated by the first stage report and one panel-common inter-polarization co-phasing value that is indicated by the second stage report.

9 . The method of claim 7 , wherein codebook mode 2 includes 2N g −2 co-phasing values that are indicated by the first stage report and 2N g −1 co-phasing values that are indicated by the second stage report.

10 . The method of claim 6 , wherein the CSI report is a single-stage report indicating all the co-phasing values in codebook mode 3.

11 . The method of claim 1 , wherein the first device and the second device are a user equipment and a base station, respectively.

12 . The method of claim 1 , wherein the first device and the second device are a base station and a user equipment, respectively.

13 . A first device, comprising:
processing circuitry configured to
send, to a second device, a reference signal for channel state information (CSI) measurement of a channel between the first device and the second device,
receive, from the second device, a CSI report indicating a transmit precoder matrix indicator (TPMI) that indicates one of a plurality of precoder matrices, and
precode a to-be-transmitted signal based on the one of the plurality of precoder matrices indicated by the TPMI, where each of the plurality of precoder matrices is able to be used for up to 8-layer transmission.

14 . The first device of claim 13 , further comprises 8 antenna ports for transmission, the 8 antenna ports being grouped into a single panel or multiple panels.

15 . The first device of claim 14 , wherein the 8 antenna ports are fully coherent to each other.

16 . The first device of claim 15 , wherein the plurality of precoder matrices is classified into three matrix sets each corresponding to one of three codebook modes 1-3, each matrix set including 8 columns of precoder matrices.

17 . The first device of claim 16 , wherein in each matrix set, column 1 defines a general structure, column 2 adds a 180° phase shift for inter-polarization co-phasing values with respect to column 1, column 3 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 1, column 4 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 2, column 5 adds a 90° phase shift for inter-polarization co-phasing values with respect to column 1, column 6 adds a −90° phase shift for inter-polarization co-phasing values with respect to column 1, column 7 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 5, and column 8 adds a 180° phase shift for inter-panel co-phasing values for all panels with an odd index, with respect to column 6.

18 . The first device of claim 16 , wherein N g represents a number of antenna panels that antenna ports of the UE are grouped into, codebook mode 1 includes N g co-phasing values, codebook mode 2 includes 4N g −3 co-phasing values, and codebook mode 3 includes 2N g −1 co-phasing values.

19 . The first device of claim 18 , wherein the CSI report is a dual-stage report including a first stage report indicating slow-changing indices that are reported with low periodicity and a second stage report indicating fast-changing indices that are reported with high periodicity.

20 . The first device of claim 19 , wherein codebook mode 1 includes N g −1 inter-panel co-phasing values that are indicated by the first stage report and one panel-common inter-polarization co-phasing value that is indicated by the second stage report.

21 . The first device of claim 19 , wherein codebook mode 2 includes 2N g −2 co-phasing values that are indicated by the first stage report and 2N g −1 co-phasing values that are indicated by the second stage report.

22 . The first device of claim 18 , wherein the CSI report is a single-stage report indicating all the co-phasing values in codebook mode 3.

23 . The first device of claim 13 , wherein the first device and the second device are a user equipment and a base station, respectively.

24 . The first device of claim 13 , wherein the first device and the second device are a base station and a user equipment, respectively.

25 . A non-transitory computer-readable medium storing instructions which, when executed by a first device, cause the first device to perform a method comprising:
sending, to a second device, a reference signal for channel state information (CSI) measurement of a channel between the first device and the second device; receiving, from the second device, a CSI report indicating a transmit precoder matrix indicator (TPMI) that indicates one of a plurality of precoder matrices; and precoding a to-be-transmitted signal b

Assignees

• Mediatek Inc

Inventors

• Shabara Yahia Ahmed Mahmoud Mahmoud
• Cheraghi Parisa

Classifications

• H04B7/10

  Polarisation diversity; Directional diversity · CPC title

• H04B7/0682

  using phase diversity (e.g. phase sweeping) · 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

• H04B7/0626 Primary

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0478

  Special codebook structures directed to feedback optimisation · CPC title