Method and apparatus for CSI reporting

Patent metadata

Field	Value
Publication number	US-12047145-B2
Application number	US-202217584312-A
Country	US
Kind code	B2
Filing date	Jan 25, 2022
Priority date	Feb 3, 2021
Publication date	Jul 23, 2024
Grant date	Jul 23, 2024

Abstract

A method for operating a user equipment (UE) comprises receiving configuration information about a channel state information (CSI) report, the configuration information including codebook parameters (M, α, β), wherein: M is a number of frequency domain basis vectors, α is a number ≤1, and β is a number ≤1; identifying values of M, α, and β; determining a value of K 1 based on α, where K 1 is a number of selected CSI reference signal (CSI-RS) ports from a total of P CSI-RS ports; determining a maximum number of non-zero coefficients based on β; determining the CSI report based on the values of M, K 1 , and the maximum number of non-zero coefficients; and transmitting the CSI report.

First claim

What is claimed is:

1. A user equipment (UE) comprising:
a transceiver configured to receive configuration information about a channel state information (CSI) report, the configuration information including codebook parameters (M, α, β), wherein:
M is a number of frequency domain basis vectors,
α is a number ≤1, and
β is a number ≤1; and

a processor operably coupled to the transceiver, the processor, based on the configuration information, configured to:
identify values of M, α, and β;
determine a value of K 1 based on α, where K 1 is a number of selected CSI reference signal (CSI-RS) ports from a total of P CSI-RS ports;
determine a maximum number of non-zero coefficients based on β; and
determine the CSI report based on the values of M, K 1 , and the maximum number of non-zero coefficients;

wherein the transceiver is further configured to transmit the CSI report.

2. The UE of claim 1 , wherein the codebook parameters (M, α, β) are configured jointly via a single radio resource control (RRC) parameter paramCombination-r17.

3. The UE of claim 2 , wherein a mapping between the codebook parameters (M, α, β) and the parameter paramCombination-r17 is based on a table given by

paramCombination-r17
M
α
β

X1
1
¾
½

X2
1
1
½

X3
1
1
¾

X4
1
1
1

X5
2
½
½

X6
2
¾
½

X7
2
1
½

X8
2
1
¾

wherein the UE is configured with a value of the parameter paramCombination-r17 that is configured from a set of values {X1, X2, . . . , X8}.

4. The UE of claim 3 , wherein the UE is not expected to be configured with paramCombination-r17=X1 or X6 indicating α=¾, when P∈{4,12}.

5. The UE of claim 3 , wherein the UE is not expected to be configured with paramCombination-r17=X5 indicating α=½, when P=4, and allowed rank values for the CSI report include 3 or 4.

6. The UE of claim 3 , wherein the UE is not expected to be configured with allowed rank values for the CSI report including 3 or 4, when P=4, and paramCombination-r17=X5 indicating α=½.

7. The UE of claim 1 , wherein:
when α=½ or ¾, the CSI report includes an indicator i 1,2 indicating CSI-RS port selection vectors; and
when α=1, the CSI report does not include the indicator i 1,2 .

8. A base station (BS) comprising:
a processor configured to generate configuration information about a channel state information (CSI) report, the configuration information including codebook parameters (M, α, β), wherein:
M is a number of frequency domain basis vectors,
α is a number ≤1, and
β is a number ≤1; and

a transceiver operably coupled to the processor, the transceiver configured to:
transmit the configuration information about the CSI report, and
receive the CSI report;

wherein the CSI report is based on values of M, K 1 , and a maximum number of non-zero coefficients,
wherein the maximum number of non-zero coefficients is based on β, and
wherein K 1 is based on α and is a number of selected CSI reference signal (CSI-RS) ports from a total of P CSI-RS ports.

9. The BS of claim 8 , wherein the codebook parameters (M, α, β) are configured jointly via a single radio resource control (RRC) parameter paramCombination-r17.

10. The BS of claim 9 , wherein a mapping between the codebook parameters (M, α, β) and the parameter paramCombination-r17 is based on a table given by

paramCombination-r17
M
α
β

X1
1
¾
½

X2
1
1
½

X3
1
1
¾

X4
1
1
1

X5
2
½
½

X6
2
¾
½

X7
2
1
½

X8
2
1
¾

wherein a value of the parameter paramCombination-r17 is configured from a set of values {X1, X2, . . . , X8}.

11. The BS of claim 10 , wherein the parameter paramCombination-r17 cannot take a value X1 or X6 indicating α=¾, when P∈{4,12}.

12. The BS of claim 10 , wherein the parameter paramCombination-r17 cannot take a value X5 indicating α=½, when P=4, and allowed rank values for the CSI report include 3 or 4.

13. The BS of claim 8 , wherein:
when α=½ or ¾, the CSI report includes an indicator i 1,2 indicating CSI-RS port selection vectors; and
when α=1, the CSI report does not include the indicator i 1,2 .

14. A method for operating a user equipment (UE), the method comprising:
receiving configuration information about a channel state information (CSI) report, the configuration information including codebook parameters (M, α, β), wherein:
M is a number of freque

Assignees

• Samsung Electronics Co Ltd

Inventors

• Rahman Md Saifur
• Onggosanusi Eko

Classifications

• H04L25/0202

  Channel estimation · CPC title

• H04W24/10

  Scheduling measurement reports {; Arrangements for measurement reports} · CPC title

• H04W24/08

  Testing, {supervising or monitoring} using real traffic · CPC title

• H04L5/0048

  Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091) · 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