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

• US 9,503,234 B2
• Filed: 09/16/2013
• Issued: 11/22/2016
• 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:
  US14/383,738
• Publication Number:
  US 20150131603A1
• Time in Patent Office: 1,163 Days
• 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 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 for receiving data in a wireless access system, the method performed by a user equipment and comprising:

configuring one or more CSI-RS (Channel State Information-Reference Signal) resource configurations;

receiving DCI (Downlink Control Information) which does not include information identifying a CSI-RS resource configuration using non-zero transmission power;

decoding PDSCH (Physical Downlink Control Channel) based on the DCI by assuming the PDSCH is not mapped to resource elements which are used for transmission of a lowest indexed zero-power CSI-RS.

2. The method of claim 1, wherein the DCI includes a format 1A DCI.

3. The method of claim 1, wherein a IMR (Interference Measurement Resource) exists in a union of zero-power CSI-RS resources corresponding to the one or more CSI-RS resource configurations.

4. The method of claim 3, wherein the decoding step comprises:

assuming that the PDSCH is not mapped to resource elements used for transmission of the lowest indexed zero-power CSI-RS among resource elements of the IMR; and

assuming that the PDSCH is mapped to the resource elements of the IMR other than the resource elements used for transmission of the lowest indexed zero-power CSI-RS.

5. The method of claim 1, wherein information of the one or more CSI-RS resource configurations is transmitted using Radio Resource Control (RRC) signaling.

6. The method of claim 1, wherein information of the one or more CSI-RS resource configurations includes at least one of a subframe offset and a subframe period.

7. A user equipment for receiving data in a wireless access system, the user equipment comprising:

a radio frequency (RF) unit; and

a processor configured to;

configure one or more CSI-RS (Channel State Information-Reference Signal) resource configurations;

receive DCI (Downlink Control Information) which does not include information identifying a CSI-RS resource configuration using non-zero transmission power;

decode PDSCH (Physical Downlink Control Channel) based on the DCI by assuming the PDSCH is not mapped to resource elements which are used for transmission of a lowest indexed zero-power CSI-RS.

8. The user equipment of claim 7, wherein the DCI includes a format 1A DCI.

9. The user equipment of claim 7, wherein a IMR (Interference Measurement Resource) exists in a union of zero-power CSI-RS resources corresponding to the one or more CSI-RS resource configurations.

10. The user equipment of claim 9, wherein the processor is further configured to:

assume that the PDSCH is not mapped to resource elements used for transmission of the lowest indexed zero-power CSI-RS among resource elements of the IMR; and

assume that the PDSCH is mapped to the resource elements of the IMR other than the resource elements used for transmission of the lowest indexed zero-power CSI-RS.

11. The user equipment of claim 7, wherein information of the one or more CSI-RS resource configurations is transmitted using Radio Resource Control (RRC) signaling.

12. The user equipment of claim 7, wherein information of the one or more CSI-RS resource configurations includes at least one of a subframe offset and a subframe period.