METHOD FOR REPORTING CSI IN WIRELESS COMMUNICATION SYSTEM AND APPARATUS THEREFOR

• US 20180278313A1
• Filed: 06/13/2016
• Published: 09/27/2018
• Est. Priority Date: 12/31/2015
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Hyungtae, PARK, Jonghyun
• Granted Patent: US 10,396,877 B2
• Time in Patent Office: Days
• CPC Class Codes: H04B 7/04 using two or more spaced independent antennas
• CPC Class Codes: H04B 7/0413 MIMO systems
• CPC Class Codes: H04B 7/06 at the transmitting station
• CPC Class Codes: H04B 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver

Abstract

A method for reporting channel status information (CSI) to a base station by a terminal in a wireless access system is disclosed in the present application. The method for reporting CSI comprises the steps of: receiving information on a first CSI process and a second CSI process, each of which includes two or more CSI-reference signal (CSI-RS) resources, through an upper layer; and transmitting, to the base station, a first CSI report according to the first CSI process and a second CSI report corresponding to the second CSI process, wherein the second CSI process is configured to have a rank indicator (RI) value that is the same as the RI of the first CSI process, and the numbers of antenna ports for all the CSI-RS resources included in the first CSI process and the second CSI process are the same.

Claims

1. A method of reporting CSI (channel status information), which is reported by a user equipment (UE) to a base station in a wireless access system, comprising the steps of:

receiving information on a first CSI process and a second CSI process, each of which contains two or more CSI-RS (channel status information-reference signal) resources, through an upper layer; and

transmitting a first CSI report according to the first CSI process and a second CSI report corresponding to the second CSI process to the base station,

wherein the second CSI process is configured to have an RI value identical to an RI (rank indicator) of the first CSI process and wherein the number of antenna ports of all CSI-RS resources contained in the first CSI process is identical to the number of antenna ports of all CSI-RS resources contained in the second CSI process.

2. The method of claim 1, wherein independent beamforming is applied to each of the two or more CSI-RS resources.

3. The method of claim 1, further comprising the step of receiving information on a CSI reporting type via the upper layer,

wherein the CSI reporting type comprises information on whether or not the two or more CSI-RS resources are aggregated.

4. The method of claim 3, wherein the CSI reporting type indicates that each of the two or more CSI-RS resources corresponds to an independent channel which is not combined.

5. The method of claim 1, wherein the first CSI process corresponds to a reference CSI process and wherein the second CSI process corresponds to a dependent CSI process of the reference CSI process.

6. The method of claim 1, wherein a restriction RI set is common to all CSI-RS resources contained in the first CSI process and the second CSI process.

7. A user equipment (UE) estimating a channel in a wireless communication system, comprising:

an RF (radio frequency) unit configured to transceive a signal with a base station; and

a processor configured to process the signal, the processor configured to set a first CSI process and a second CSI process, each of which contains two or more CSI-RS (channel status information-reference signal) resources, through an upper layer, the processor configured to control the RF unit to transmit a first CSI report according to the first CSI process and a second CSI report corresponding to the second CSI process to the base station,

wherein the second CSI process is configured to have an RI value identical to an RI (rank indicator) of the first CSI process and wherein the number of antenna ports of all CSI-RS resources contained in the first CSI process is identical to the number of antenna ports of all CSI-RS resources contained in the second CSI process.

8. The UE of claim 7, wherein independent beamforming is applied to each of the two or more CSI-RS resources.

9. The UE of claim 7, wherein the processor is configured to set a CSI reporting type via the upper layer and wherein the CSI reporting type comprises information on whether or not the two or more CSI-RS resources are aggregated.

10. The UE of claim 9, wherein the CSI reporting type indicates that each of the two or more CSI-RS resources corresponds to an independent channel which is not combined.

11. The UE of claim 7, wherein the first CSI process corresponds to a reference CSI process and wherein the second CSI process corresponds to a dependent CSI process of the reference CSI process.

12. The UE of claim 7, wherein a restriction RI set is common to all CSI-RS resources contained in the first CSI process and the second CSI process.