# US 12,191,952 B2 · Method and apparatus for CSI reporting

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- Number: US 12,191,952 B2
- Document ID: US12191952B2
- Status: Granted
- Kind: B2
- Application number: 17/580,544
- Filed: 2022-01-20
- Published: 2022-07-28
- Granted: 2025-01-07
- Earliest claimed: 2021-01-25
- Assignees: Samsung Electronics Co., Ltd.
- Applicants: Samsung Electronics Co., Ltd.
- Inventors: Md. Saifur Rahman; Eko Onggosanusi
- Web page: https://patentgrep.com/patent/US12191952B2

## CPC

- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04B 7/0632: {Channel quality parameters, e.g. channel quality indicator [CQI]}
- H04B 7/0636: {Feedback format}
- H04B 7/0628: {Diversity capabilities}
- H04B: TRANSMISSION

## Abstract

A method for operating a user equipment (UE) comprises receiving configuration information about a channel state information (CSI) report, the configuration information including information about a number M denoting a number of frequency domain basis vectors; identifying a value of M; determining, based on the value of M, a frequency granularity of the CSI report from wideband (WB) and subband (SB); determining the CSI report according to the frequency granularity; and transmitting the CSI report.

## Claims

### Claim 1

A user equipment (UE) comprising:
a transceiver configured to receive configuration information about a channel state information (CSI) report, the configuration information including information about a number M denoting a number of frequency domain basis vectors; and
a processor operably coupled to the transceiver, the processor, based on the configuration information, configured to:
identify a value of M,
determine, based on the value of M, a frequency granularity of the CSI report from wideband (WB) and subband (SB), wherein the frequency granularity of the CSI report=WB when M=1, and
determine the CSI report according to the frequency granularity;
wherein the transceiver is further configured to transmit the CSI report.

### Claim 2 (depends on 1)

The UE of claim 1, wherein:
the configuration information includes information about a channel quality indicator (CQI) format, and
the frequency granularity of the CSI report=WB when M=1 and the CQI format=WB.

### Claim 3 (depends on 2)

The UE of claim 2, wherein the configuration information includes information about reportQuantity indicating a content of the CSI report, and reportQuantity is set to ‘cri-RI-PMI-CQI’, or ‘cri-RI-LI-PMI-CQI’, where;
cri=CSI-RS resource indicator,
RI=rank indicator,
PMI=precoding matrix indicator, and
LI=layer indicator.

### Claim 4 (depends on 3)

The UE of claim 3, wherein the configuration information includes information about codebookType, and codebookType is set to ‘typeII-PortSelection-r17’ indicating a port selection codebook.

### Claim 5 (depends on 1)

The UE of claim 1, wherein the value of M and the frequency granularity of the CSI report are based on a bandwidth part (BWP) size that includes a CSI reporting band.

### Claim 6 (depends on 5)

The UE of claim 5, wherein:
when the BWP size is <24 physical resource blocks (PRBs): M is fixed as M=1 and the frequency granularity of the CSI report is fixed as WB.

### Claim 7

A base station (BS) comprising:
a processor configured to generate configuration information about a channel state information (CSI) report, the configuration information including information about a number M denoting a number of frequency domain basis vectors; 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 a frequency granularity of the CSI report is determined from wideband (WB) and subband (SB) based on a value of M, wherein the frequency granularity of the CSI report=WB when M=1.

### Claim 8 (depends on 7)

The BS of claim 7, wherein:
the configuration information includes information about a channel quality indicator (CQI) format, and
the frequency granularity of the CSI report=WB when M=1 and the CQI format=WB.

### Claim 9 (depends on 8)

The BS of claim 8, wherein the configuration information includes information about reportQuantity indicating a content of the CSI report, and reportQuantity is set to ‘cri-RI-PMI-CQI’, or ‘cri-RI-LI-PMI-CQI’, where;
cri=CSI-RS resource indicator,
RI=rank indicator,
PMI=precoding matrix indicator, and
LI=layer indicator.

### Claim 10 (depends on 9)

The BS of claim 9, wherein the configuration information includes information about codebookType, and codebookType is set to ‘typeII-PortSelection-r17’ indicating a port selection codebook.

### Claim 11 (depends on 7)

The BS of claim 7, wherein the value of M and the frequency granularity of the CSI report are based on a bandwidth part (BWP) size that includes a CSI reporting band.

### Claim 12 (depends on 11)

The BS of claim 11, wherein:
when the BWP size is <24 physical resource blocks (PRBs): M is fixed as M=1 and the frequency granularity of the CSI report is fixed as WB.

### Claim 13

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 information about a number M denoting a number of frequency domain basis vectors;
identifying a value of M;
determining, based on the value of M, a frequency granularity of the CSI report from wideband (WB) and subband (SB), wherein the frequency granularity of the CSI report=WB when M=1;
determining the CSI report according to the frequency granularity; and
transmitting the CSI report.

### Claim 14 (depends on 13)

The method of claim 13, wherein:
the configuration information includes information about a channel quality indicator (CQI) format, and
the frequency granularity of the CSI report=WB when M=1 and the CQI format=WB.

### Claim 15 (depends on 14)

The method of claim 14, wherein the configuration information includes information about reportQuantity indicating a content of the CSI report, and reportQuantity is set to ‘cri-RI-PMI-CQI’, or ‘cri-RI-LI-PMI-CQI’, where;
cri=CSI-RS resource indicator,
RI=rank indicator,
PMI=precoding matrix indicator, and
LI=layer indicator.

### Claim 16 (depends on 15)

The method of claim 15, wherein the configuration information includes information about codebookType, and codebookType is set to ‘typeII-PortSelection-r17’ indicating a port selection codebook.

### Claim 17 (depends on 13)

The method of claim 13, wherein:
the value of M and the frequency granularity of the CSI report are based on a bandwidth part (BWP) size that includes a CSI reporting band, and
when the BWP size is <24 physical resource blocks (PRBs): M is fixed as M=1 and the frequency granularity of the CSI report is fixed as WB.