Method and apparatus for transceiving channel status information in wireless communication system supporting cooperative transmission

• US 9,596,067 B2
• Filed: 09/16/2013
• Issued: 03/14/2017
• Est. Priority Date: 09/16/2012
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hyungtae, Park, Jonghyun, Kim, Kijun, Kim, Eunsun
• Primary Examiner(s): DUONG, CHRISTINE T
• Application Number:
  US14/421,787
• Publication Number:
  US 20150215093A1
• Time in Patent Office: 1,275 Days
• Field of Search: None
• US Class Current: 1/1
• 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 7/0626 Channel coefficients, e.g. channel state information [CSI]
• CPC Class Codes: H04L 5/0005 Time-frequency
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0035 Resource allocation in a cooperative multipoint environment
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04L 5/0094 Indication of how sub-channels of the path are allocated
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

The present invention relates to a wireless communication system. A method for reporting CSI (Channel State Information) in a cooperative multi-point (CoMP) wireless communication system, the method performed by a user equipment (UE) and comprising receiving first resource configuration information for a CSI-RS (Channel-State Information-Reference Signal) and second resource configuration information for interference measurement; and calculating CSI using the first resource configuration information and the second resource configuration information, the CSI being for one or more base stations (BSs) among a plurality of BSs participating the COMP, wherein an interference measurement resource according to the second resource configuration information exists in a union of zero-power CSI-RS resources of each of the plurality of BSs.

Claims

1. A method for reporting Channel State Information (CSI) by a user equipment (UE) in a wireless communication system, the method comprising:

receiving multiple zero-power CSI-reference signal (ZP CSI-RS) configurations associated with multiple transmission points configured to perform coordinated multi-point (CoMP) operation for the UE;

receiving an enhanced physical downlink control channel (EPDCCH) configuration that identifies one of the multiple ZP CSI-RS configuration;

receiving information on a CSI process associated with a CSI-RS configuration and a CSI-Interference Measurement (CSI-IM) configuration;

receiving, via an EPDCCH, downlink control information (DCI) indicating the CSI process; and

transmitting the CSI based on at least one of the CSI-RS configuration and the CSI-IM configuration for the CSI process,

wherein, in receiving the DCI, the UE determines that the DCI of the EPDCCH is not mapped to a resource of a ZP CSI-RS configuration that is identified by the EPDCCH configuration,

wherein the CSI-IM configuration indicates resource elements, a period and a subframe offset for interference measurement, and

wherein the resource elements, the period and the subframe offset indicated by the CSI-IM configuration are included in one of the multiple ZP CSI-RS configurations.

2. The method of claim 1, wherein each of the multiple ZP CSI-RS configurations includes a bitmap indicating a resource at which a zero-power CSI-RS is mapped.

3. The method of claim 1, wherein each of the multiple ZP CSI-RS configurations includes subframe information indicating a subframe at which a zero-power CSI-RS is transmitted.

4. The method of claim 1, wherein the information on the CSI process is received via Radio Resource Control (RRC) signaling.

5. The method of claim 1, wherein the CSI includes a Channel Quality Indicator (CQI).

13. The method of claim 1,

wherein the DCI includes downlink control information (DCI) including a field indicating the CSI process among one or more CSI processes configured in the UE.

14. The method of claim 13, wherein a size of the field corresponds to 2-bit.

15. The method of claim 13, further comprising:

receiving a CSI-RS based on a CSI-RS configuration associated with the CSI process indicated by the field.

6. A method for receiving Channel State Information (CSI) by a base station (BS) in a wireless communication system, the method comprising:

transmitting multiple zero-power CSI-reference signal (ZP CSI-RS) configurations associated with multiple transmission points configured to perform coordinated multi-point (CoMP) operation for the UE;

transmitting an enhanced physical downlink control channel (EPDCCH) configuration that identifies one of the multiple ZP CSI-RS configuration;

transmitting information a CSI process associated with a CSI-RS configuration and a CSI-Interference Measurement (CSI-IM) configuration;

transmitting, via an EPDCCH, downlink control information (DCI) indicating the CSI process; and

receiving the CSI based on at least one of the CSI-RS configuration and the CSI-IM configuration for the CSI process,

wherein the BS does not map the DCI of the EPDCCH to a resource of a ZP CSI-RS configuration that is identified by the EPDCCH configuration,

wherein the CSI-IM configuration indicates resource elements, a period and a subframe offset for interference measurement, and

wherein the resource elements, the period and the subframe offset indicated by the CSI-IM configuration are included in one of the multiple ZP CSI-RS configurations.

7. The method of claim 6, wherein each of the multiple ZP CSI-RS configurations includes a bitmap indicating a resource at which a zero-power CSI-RS is mapped.

8. The method of claim 6, wherein each of the multiple ZP CSI-RS configurations includes subframe information indicating a subframe at which a zero-power CSI-RS is transmitted.

9. The method of claim 6, wherein the information on the CSI process is transmitted using Radio Resource Control (RRC) signaling.

10. The method of claim 6, wherein the CSI includes a Channel Quality Indicator (CQI).

11. A user equipment (UE) for reporting Channel State Information (CSI) in a wireless communication system, the UE comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to control the RF unit to;

receive multiple zero-power CSI-reference signal (ZP CSI-RS) configurations associated with multiple transmission points configured to perform coordinated multi-point (CoMP) operation for the UE;

receive an enhanced physical downlink control channel (EPDCCH) configuration that identifies one of the multiple ZP CSI-RS configuration;

receive information on a CSI process associated with a CSI-RS configuration and a CSI-Interference Measurement (CSI-IM) configuration;

receive, via an EPDCCH, downlink control information (DCI) indicating the CSI process; and

transmit the CSI based on at least one of the CSI-RS configuration and the CSI-IM configuration for the CSI process,

wherein, in receiving the DCI, the UE determines that the DCI of the EPDCCH is not mapped to a resource of a ZP CSI-RS configuration that is identified by the EPDCCH configuration,

wherein the CSI-IM configuration indicates resource elements, a period and a subframe offset for interference measurement, and

wherein the resource elements, the period and the subframe offset indicated by the CSI-IM configuration are included in one of the multiple ZP CSI-RS configurations.

12. A base station (BS) for receiving Channel State Information (CSI) in a wireless communication system, the BS comprising:

a radio frequency (RF) unit; and

a processor,

wherein the processor is configured to control the RF unit to;

transmit multiple zero-power CSI-reference signal (ZP CSI-RS) configurations associated with multiple transmission points configured to perform coordinated multi-point (CoMP) operation for the UE;

transmit an enhanced physical downlink control channel (EPDCCH) configuration that identifies one of the multiple ZP CSI-RS configuration;

transmit information on a CSI process associated with a CSI-RS configuration and a CSI-Interference Measurement (CSI-IM) configuration;

transmit, via an EPDCCH, downlink control information (DCI) indicating the CSI process; and

receive the CSI based on at least one of the CSI-RS configuration and the CSI-IM configuration for the CSI process,

wherein the BS does not map the DCI of the EPDCCH to resource of a ZP CSI-RS configuration that is identified by the EPDCCH configuration,

wherein the CSI-IM configuration indicates resource elements, a period and a subframe offset for interference measurement, and

wherein the resource elements, the period and the subframe offset indicated by the CSI-IM configuration are included in one of the multiple ZP CSI-RS configurations.