METHOD AND APPARATUS FOR REPORTING CHANNEL STATE INFORMATION IN WIRELESS COMMUNICATION SYSTEM

• US 20150063142A1
• Filed: 04/12/2013
• Published: 03/05/2015
• Est. Priority Date: 04/13/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Kijun, Sohn, Illsoo, Park, Jonghyun
• Granted Patent: US 9,723,506 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04B 17/309 Measuring or estimating channel quality parameters
• CPC Class Codes: H04B 7/024 Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
• CPC Class Codes: H04B 7/0617 for beam forming
• CPC Class Codes: H04B 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04L 43/08 Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

One embodiment of the present invention relates to a method for a terminal to report channel state information in a wireless communication system, comprising the steps of: calculating one or more pieces of channel quality information from a signal measurement resource configuration and a plurality of interference measurement resource configurations associated with the signal measurement resource configuration; and transmitting a channel state report including the calculated channel quality information.

Claims

1. A method for reporting channel state information by a user equipment in a wireless communication system, comprising:

calculating at least one channel quality information from a signal measurement resource configuration and a plurality of interference measurement resource configurations associated with the signal measurement resource configuration; and

transmitting a channel state report containing the calculated channel quality information.

2. The method according to claim 1, wherein a combination of the signal measurement resource configuration and the interference measurement resource configurations for calculating the at least one channel quality information changes depending on a rank indicator.

3. The method according to claim 1, wherein:

if a rank indicator is greater than 1, each of the at least one channel quality information is based on the same combination of the signal measurement resource configuration and the interference measurement resource configurations; and

if the rank indicator is 1, each of the at least one channel quality information is based on a different combination of the signal measurement resource configuration and the interference measurement resource configurations.

4. The method according to claim 1, wherein the signal measurement resource configuration and the plurality of interference measurement resource configurations correspond to one channel state information feedback configuration.

5. The method according to claim 1, wherein association between the signal measurement resource configuration and the plurality of interference measurement resource configurations is used only for the user equipment.

6. The method according to claim 1, wherein:

the signal measurement resource configuration is for transmission of a signal from one of a first transmission point and a second transmission point, the first transmission point and the second transmission point belonging to a coordinated multi point (CoMP) cluster; and

the plurality of interference measurement resource configurations is related to presence or absence of interference from a transmission point between the first transmission point and the second transmission point, the transmission point not transmitting the signal.

7. The method according to claim 1, wherein priorities are set for the plurality of interference measurement resource configurations.

8. The method according to claim 7, wherein the calculating of the channel quality information comprises:

calculating a rank indicator using the signal measurement resource configuration and an interference measurement resource configuration having highest priority among the interference measurement resource configurations.

9. The method according to claim 8, wherein, if the rank indicator is greater than 1, the user equipment calculates channel quality information for each codeword from the signal measurement resource configuration and the interference measurement resource configuration having the highest priority.

10. The method according to claim 8, wherein, if the rank indicator is 1, the user equipment calculates a channel quality information from the signal measurement resource configuration and the interference measurement resource configuration having the highest priority, and calculates a second channel quality information from the signal measurement resource configuration and an interference measurement resource configuration having next highest priority after the interference measurement resource configuration having the highest priority.

11. The method according to claim 1, wherein the signal measurement resource configuration is related to a non-zero power channel state information-reference signal (CSI-RS) resource, and the interference measurement resource configurations are related to a zero power CSI-RS resource.

12. The method according to claim 1, wherein the signal measurement resource configuration is a channel state information-reference signal (CSI-RS) resource configuration, and the interference measurement resource configurations are channel state information-interference measurement (CSI-IM) resource configurations.

13. A user equipment in a wireless communication system, comprising:

a receive module; and

a processor,

wherein the processor calculates at least one channel quality information from a signal measurement resource configuration and a plurality of interference measurement resource configurations associated with the signal measurement resource configuration, and transmits a channel state report containing the calculated channel quality information.