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

• US 10,050,757 B2
• Filed: 04/29/2016
• Issued: 08/14/2018
• 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
• Application Number:
  US15/142,449
• Publication Number:
  US 20160248568A1
• Time in Patent Office: 837 Days
• Field of Search: None
• 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), the method comprising:

receiving information on multiple CSI processes, each of the multiple CSI processes associated with a CSI-reference signal (CSI-RS) resource and an interference measurement resource (IMR);

receiving an enhanced physical downlink control channel (EPDCCH) configuration;

receiving downlink control channel (DCI) via an EPDCCH based on the EPDCCH configuration;

performing interference measurement based on an IMR of a predetermined CSI process among the multiple CSI processes; and

reporting CSI based on the interference measurement,

wherein the IMR of the predetermined CSI process used for the interference measurement is specified by a field of the DCI received via the PDCCH, and

wherein, in receiving the DCI, the UE determines that the DCI is not mapped to a resource for a zero power CSI-RS that is identified by the EPDCCH configuration.

2. The method of claim 1, wherein a size of the field specifying the IMR of the predetermined CSI process corresponds to 2-bit.

3. The method of claim 1, wherein the field of the DCI indicates a CSI-RS for signal measurement.

4. The method of claim 1, further comprising:

receiving multiple zero-power CSI-RS (ZP CSI-RS) configurations for multiple transmission points configured to perform coordinated multi-point (CoMP) operation.

5. The method of claim 4, wherein each of the multiple ZP CSI-RS configurations includes a period of a ZP CSI-RS, subframe offset and ZP CSI-RS resource information.

6. The method of claim 1, wherein the IMR of the predetermined CSI process is included in one of the multiple ZP CSI-RS configurations.

7. The method of claim 1, wherein the CSI includes a channel quality indicator (CQI) computed based on the interference measurement.

8. A method for receiving channel state information (CSI) by a base station, the method comprising:

transmitting information on multiple CSI processes, each of the multiple CSI processes associated with a CSI-reference signal (CSI-RS) resource and an interference measurement resource (IMR);

transmitting an enhanced physical downlink control channel (EPDCCH) configuration;

transmitting downlink control channel (DCI) via an EPDCCH based on the EPDCCH configuration;

receiving CSI based on interference measurement, the interference measurement performed based on an IMR of a predetermined CSI process among the multiple CSI processes,

wherein the IMR of the predetermined CSI process used for the interference measurement is specified by a field of the DCI transmitted via the PDCCH, and

wherein in transmitting the DCI, the base station does not map the DCI to a resource for a zero power CSI-RS that is identified by the EPDCCH configuration.

9. The method of claim 8, wherein a size of the field specifying the IMR of the predetermined CSI process corresponds to 2-bit.

10. The method of claim 8, wherein the field of the DCI indicates a CSI-RS for signal measurement.

11. The method of claim 8, further comprising:

transmitting multiple zero-power CSI-RS (ZP CSI-RS) configurations for multiple transmission points configured to perform coordinated multi-point (CoMP) operation.

12. The method of claim 11, wherein each of the multiple ZP CSI-RS configurations includes a period of a ZP CSI-RS, subframe offset and ZP CSI-RS resource information.

13. The method of claim 8, wherein the IMR of the predetermined CSI process is included in one of the multiple ZP CSI-RS configurations.

14. The method of claim 8, wherein the CSI includes a channel quality indicator (CQI) computed based on the interference measurement.

15. A user equipment (UE) for reporting channel state information (CSI), the UE comprising:

a receiver configured to receive information on multiple CSI processes, each of the multiple CSI processes associated with a CSI-reference signal (CSI-RS) resource and an interference measurement resource (IMR), to receive an enhanced physical downlink control channel (EPDCCH) configuration, and to receive downlink control channel (DCI) via an EPDCCH based on the EPDCCH configuration; and

a processor configured to perform interference measurement based on an IMR of a predetermined CSI process among the multiple CSI processes and to report CSI based on the interference measurement,

wherein the IMR of the predetermined CSI process used for the interference measurement is specified by a field of the DCI received via the PDCCH, and

wherein in receiving the DCI, the UE determines that the DCI is not mapped to a resource for a zero power CSI-RS that is identified by the EPDCCH configuration.

16. A base station for receiving channel state information (CSI), the BS comprising:

a transmitter configured to transmit information on multiple CSI processes, each of the multiple CSI processes associated with a CSI-reference signal (CSI-RS) resource and an interference measurement resource (IMR), to transmit an enhanced physical downlink control channel (EPDCCH) configuration, and to transmit downlink control channel (DCI) via an EPDCCH based on the EPDCCH configuration;

a receiver configured to receive CSI based on interference measurement, the interference measurement performed based on an IMR of a predetermined CSI process among the multiple CSI processes; and

a processor configured to control the receiver and the transmitter,

wherein the IMR of the predetermined CSI process used for the interference measurement is specified by a field of the DCI transmitted via the PDCCH, and

wherein the processor does not map the DCI to a resource for a zero power CSI-RS that is identified by the EPDCCH configuration.