# US 11,121,755 B2 · Method for reporting channel state information in wireless communication system and apparatus therefor

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- Number: US 11,121,755 B2
- Document ID: US11121755B2
- Status: Granted
- Kind: B2
- Application number: 16/816,946
- Filed: 2020-03-12
- Published: 2020-07-02
- Granted: 2021-09-14
- Earliest claimed: 2017-06-15
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyunsu Cha; Jiwon Kang; Kijun Kim; Jonghyun Park; Haewook Park
- Web page: https://patentgrep.com/patent/US11121755B2

## CPC

- H04L 27/2613: {Structure of the reference signals}
- H04B 7/0456: Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting
- H04B 7/06: at the transmitting station
- H04B 7/0626: {Channel coefficients, e.g. channel state information [CSI]}
- H04L 1/00: Arrangements for detecting or preventing errors in the information received {(correcting synchronisation H04L7/00)}
- H04L 1/0026: {Transmission of channel quality indication}
- H04L 1/16: in which the return channel carries supervisory signals, e.g. repetition request signals
- H04L 5/00: Arrangements affording multiple use of the transmission path
- H04L 5/0026: {Division using four or more dimensions, e.g. beam steering or quasi-co-location [QCL]}
- H04L 5/0048: {Allocation of pilot signals, i.e. of signals known to the receiver (allocation of control signalling H04L5/0053; use of control signalling H04L5/0091)}
- H04L 5/0091: {Signalling for the administration of the divided path, e.g. signalling of configuration information}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 5/0082: {at predetermined intervals}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)
- H04B: TRANSMISSION

## Abstract

The present disclosure provides a method for reporting channel state information (CSI) in a wireless communication system. Specifically, a method for reporting, by a user equipment (UE), channel state information (CSI) in a wireless communication system includes: receiving, from a base station, control information related to a configuration of a channel state information reference signal (CSI-RS) resource, wherein the control information includes CDM type information representing a type of code division multiplexing (CDM) applied to the CSI-RS resource; receiving, from the base station, an X-port CSI-RS on one or more component CSI-RS resource element (RE) patterns; and reporting, to the base station, the CSI based on the received X-port CSI-RS. Accordingly, the present disclosure can flexibly provide CSI-RS resource locations.

## Claims

### Claim 1

A method of receiving, by a user equipment (UE), channel state information reference signal (CSI-RS) in a wireless communication system, the method comprising:
receiving, from a base station (BS), configuration information related to a CSI-RS resource; and
receiving, from the BS, a CSI-RS on the CSI-RS resource including multiple code division multiplexing (CDM) groups,
wherein the configuration information includes information for a CDM type, and information for a number of antenna ports,
wherein locations of the CDM groups are based on the configuration information such that:
locations of 2 CDM groups are determined by 1 time-domain location value and 2 frequency-domain location values based on the number of the antenna ports being ‘8’ and the CDM type being ‘CDM4’,
locations of 3 CDM groups are determined by 1 time-domain location value and 3 frequency-domain location values based on the number of the antenna ports being ‘12’ and the CDM type being ‘CDM4’,
locations of 4 CDM groups are determined by 1 time-domain location value and 4 frequency-domain location values based on the number of the antenna ports being ‘16’ and the CDM type being ‘CDM4’, and
locations of 8 CDM groups are determined by 2 time-domain location values and 4 frequency-domain location values based on the number of the antenna ports being ‘32’ and the CDM type being ‘CDM4’.

### Claim 2 (depends on 1)

The method of claim 1, wherein the 4 CDM groups exist in a first resource region and a second resource region, respectively.

### Claim 3 (depends on 2)

The method of claim 2, wherein starting frequency-domain locations of the 4 CDM groups included in each resource region are different from each other, and starting time-domain locations of the 4 CDM groups are the same.

### Claim 4 (depends on 2)

The method of claim 2, wherein a starting frequency-domain location of a first CDM group included in the first resource region and a starting frequency-domain location of a second CDM group included in the second resource region are the same.

### Claim 5 (depends on 1)

The method of claim 1, wherein each of the multiple CDM groups is CDMed based on information for the CDM4.

### Claim 6 (depends on 1)

The method of claim 1, wherein starting frequency domain locations of the multiple CDM groups are represented as a bitmap.

### Claim 7

A user equipment (UE) configured to receive channel state information reference signal (CSI-RS) in a wireless communication system, the UE comprising:
at least one transceiver configured to transmit and receive a wireless signal; and
at least one processor functionally connected to the at least one transceiver,
the at least one processor configured to:
receive, from a base station (BS), configuration information related to a CSI-RS resource, and
receive, from the BS, a CSI-RS on the CSI-RS resource including multiple code division multiplexing (CDM) groups,
wherein the configuration information includes information for a CDM type, and information for a number of antenna ports,
wherein locations of the CDM groups are based on the configuration information such that:
locations of 2 CDM groups are determined by 1 time-domain location value and 2 frequency-domain location values based on the number of the antenna ports being ‘8’ and the CDM type being ‘CDM4’,
locations of 3 CDM groups are determined by 1 time-domain location value and 3 frequency-domain location values based on the number of the antenna ports being ‘12’ and the CDM type being ‘CDM4’,
locations of 4 CDM groups are determined by 1 time-domain location value and 4 frequency-domain location values based on the number of the antenna ports being ‘16’ and the CDM type being ‘CDM4’, and
locations of 8 CDM groups are determined by 2 time-domain location values and 4 frequency-domain location values based on the number of the antenna ports being ‘32’ and the CDM type being ‘CDM4’.

### Claim 8 (depends on 7)

The UE of claim 7, wherein the 4 CDM groups exist in a first resource region and a second resource region, respectively.

### Claim 9 (depends on 8)

The UE of claim 8, wherein starting frequency-domain locations of the 4 CDM groups included in each resource region are different from each other, and starting time-domain locations of the 4 CDM groups are the same.

### Claim 10 (depends on 8)

The UE of claim 8, wherein a starting frequency-domain location of a first CDM group included in the first resource region and a starting frequency-domain location of a second CDM group included in the second resource region are the same.

### Claim 11 (depends on 7)

The UE of claim 7, wherein each of the multiple CDM groups is CDMed based on information for the CDM4.

### Claim 12 (depends on 7)

The UE of claim 7, wherein starting frequency domain locations of the multiple CDM groups are represented as a bitmap.

### Claim 13

A processing device configured to control a user equipment (UE) to receive channel state information reference signal (CSI-RS) in a wireless communication system, the processing device comprising:
at least one processor; and
at least one computer memory operably connected to the at least one processor and storing instructions that, based on being executed by the at least one processor, perform operations comprising:
receiving, from a base station (BS), configuration information related to a CSI-RS resource, and
receiving, from the BS, a CSI-RS on the CSI-RS resource including multiple code division multiplexing (CDM) groups,
wherein the configuration information includes information for a CDM type, and information for a number of antenna ports,
wherein locations of the CDM groups are based on the configuration information such that:
locations of 2 CDM groups are determined by 1 time-domain location value and 2 frequency-domain location values based on the number of the antenna ports being ‘8’ and the CDM type being ‘CDM4’,
locations of 3 CDM groups are determined by 1 time-domain location value and 3 frequency-domain location values based on the number of the antenna ports being ‘12’ and the CDM type being ‘CDM4’,
locations of 4 CDM groups are determined by 1 time-domain location value and 4 frequency-domain location values based on the number of the antenna ports being ‘16’ and the CDM type being ‘CDM4’, and
locations of 8 CDM groups are determined by 2 time-domain location values and 4 frequency-domain location values based on the number of the antenna ports being ‘32’ and the CDM type being ‘CDM4’.