Method and apparatus for receiving data in wireless communication system supporting cooperative transmission

• US 9,729,292 B2
• Filed: 04/28/2016
• Issued: 08/08/2017
• 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, Kim, Eunsun, Park, Hanjun, Seo, Hanbyul, Park, Jonghyun, Kim, Kijun
• Primary Examiner(s): Lee, Andrew
• Application Number:
  US15/141,523
• Publication Number:
  US 20160248560A1
• Time in Patent Office: 467 Days
• 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 receiving data by a user equipment (UE) in a cooperative multi-point (CoMP) wireless communication system includes receiving downlink control information (DCI) that does not contain information indicating a transmission base station (BS) that actually transmits data among a plurality of BSs that participate in CoMP, receiving information about zero-power channel state information-reference signal (CSI-RS) of each of the plural BSs, and assuming that data is not mapped to a resource element of zero-power CSI-RS with a lowest index and receiving the data through a physical downlink control channel (PDSCH).

Claims

1. A method of receiving a physical downlink shared channel (PDSCH) by a user equipment (UE), the method comprising:

receiving information on multiple zero power channel state information-reference signal (ZP CSI-RS) resources;

receiving, via a physical downlink control channel (PDCCH), downlink control information (DCI) scheduling a PDSCH;

determining a PDSCH resource based on the DCI by assuming that the PDSCH is not mapped to one of the multiple ZP CSI-RS resources; and

performing demodulation for the PDSCH resource based on a cell-specific reference signal (CRS),

wherein when the DCI corresponds to a predetermined DCI format, a ZP CSI-RS resource, selected using a lowest index among the multiple ZP CSI-RS resources is determined to be the one ZP CSI-RS resource to which the PDSCH is not mapped.

2. The method of claim 1, wherein the predetermined DCI format is DCI format 1A.

3. The method of claim 1, wherein the predetermined DCI format does not include a field that identifies the one ZP CSI-RS resource.

4. The method of claim 1, wherein in determining the PDSCH resource, the UE assumes that the PDCCH is mapped to ZP CSI-RS resources other than the one ZP CSI-RS resource.

5. The method of claim 1, wherein the multiple ZP CSI-RS resources are associated with coordinated multi-point (COMP) operation.

6. The method of claim 1, further comprising:

receiving information on one or more interference measurement resources (IMRs) via radio resource control (RRC) signaling.

7. The method of claim 6, wherein each of the one or more IMRs exists within any one of the multiple ZP CSI-RS resources.

8. A non-transitory computer readable medium recorded thereon a program for executing the method of claim 1.

9. A user equipment (UE) for receiving a physical downlink shared channel (PDSCH), the UE comprising:

a receiver that receives information on multiple zero power channel state information-reference signal (ZP CSI-RS) resources, and receives, via a physical downlink control channel (PDCCH), downlink control information (DCI) scheduling a PDSCH; and

a processor that determines a PDSCH resource based on the DCI by assuming that the PDSCH is not mapped to one of the multiple ZP CSI-RS resources, and performs demodulation for the PDSCH resource based on a cell-specific reference signal (CRS),

wherein when the DCI corresponds to a predetermined DCI format, a ZP CSI-RS resource selected using a lowest index among the multiple ZP CSI-RS resources is determined to be the one ZP CSI-RS resource to which the PDSCH is not mapped.

10. The UE of claim 9, wherein the predetermined DCI format is DCI format 1A.

11. The UE of claim 9, wherein the predetermined DCI format does not include a field that identifies the one ZP CSI-RS resource.

12. The UE of claim 9, wherein in determining the PDSCH resource, the processor assumes that the PDCCH is mapped to ZP CSI-RS resources other than the one ZP CSI-RS resource.

13. The UE of claim 9, wherein the multiple ZP CSI-RS resources are associated with coordinated multi-point (COMP) operation.

14. The UE of claim 9, wherein the receiver receives information on one or more interference measurement resources (IMRs) via radio resource control (RRC) signaling.

15. The method of claim 14, wherein each of the one or more IMRs exists within any one of the multiple ZP CSI-RS resources.