# US 2015/0146641 A1 · Method for feeding back channel state information in wireless communication system and apparatus for same

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- Number: US 2015/0146641 A1
- Document ID: US20150146641A1
- Status: Published application
- Kind: A1
- Application number: 14/409,944
- Filed: 2013-07-12
- Published: 2015-05-28
- Earliest claimed: 2012-07-12
- Assignees: LG Electronics Inc.
- Applicants: LG Electronics Inc.
- Inventors: Hyungtae Kim; Kijun Kim
- Web page: https://patentgrep.com/patent/US20150146641A1

## CPC

- 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 1/0026: {Transmission of channel quality indication}
- H04L 5/001: {the frequencies being arranged in component carriers}
- H04L 5/0094: {Indication of how sub-channels of the path are allocated}
- H04L 5/0023: {Time-frequency-space}
- H04L 5/0035: {Resource allocation in a cooperative multipoint environment}
- H04L 5/0057: {Physical resource allocation for CQI}
- H04L 25/0204: {of multiple channels}
- H04L: TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION (arrangements common to telegraphic and telephonic communication H04M)

## Abstract

The present invention relates to a method for a terminal feeding back channel state information in a wireless communication system. More specifically, the method comprises the steps of receiving from a base station setting information on a plurality of pieces of channel state information (CSI); and generating at least one piece of channel state information by applying channel state information of a common subband in accordance with the setting information.

## Claims

### Claim 1

A method for feeding back channel state information from a user equipment in a wireless communication system, the method comprising the steps of:
receiving, from a base station, configuration information on a plurality of kinds of channel state information (CSI); and
generating at least one kind of channel state information by applying channel state information on a common subband in accordance with the configuration information.

### Claim 2 (depends on 1)

The method according to claim 1, wherein the configuration information includes information on a primary CSI-RS and secondary CSI-RSs, and the primary CSI-RS is defined as a reference CSI-RS for configuring the common subband and the secondary CSI-RSs are defined as CSI-RSs for applying the common subband.

### Claim 3 (depends on 1)

The method according to claim 1, wherein the configuration information indicates the at least one kind of channel state information to which the common subband is applied.

### Claim 4 (depends on 1)

The method according to claim 1, wherein the configuration information is received using higher layer signaling.

### Claim 5 (depends on 3)

The method according to claim 3, wherein the step of generating the at least one kind of channel state information is performed if the number of a plurality of kinds of channel state information configured for the user equipment is more than a threshold value which is previously determined.

### Claim 6 (depends on 1)

The method according to claim 1, wherein the at least one kind of channel state information is determined on the basis of channel state information index (CSI index).

### Claim 7 (depends on 6)

The method according to claim 6, wherein the channel state information index is determined on the basis of CSI-RS index.

### Claim 8 (depends on 6)

The method according to claim 6, wherein the channel state information index is determined on the basis of IMR index.

### Claim 9

A method for feeding back channel state information from a user equipment in a wireless communication system that supports carrier aggregation (CA), the method comprising the steps of:
receiving, from a base station, configuration information on a plurality of kinds of channel state information (CSI) applied to a plurality of component carriers (CCs); and
generating channel state information by applying channel state information on a common subband to a first component carrier and a second component carrier in accordance with the configuration information.

### Claim 10 (depends on 9)

The method according to claim 9, wherein the common channel state information (common CSI) applied to the first component carrier and the common channel state information applied to the second component carrier are different from each other.