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

• US 9,647,812 B2
• Filed: 04/28/2016
• Issued: 05/09/2017
• 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:
  US15/141,305
• Publication Number:
  US 20160242156A1
• Time in Patent Office: 376 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 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 corresponding to the transmission BS 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

obtaining data from the PDSCH resource,

wherein in determining the PDSCH resource, the one ZP CSI-RS resource to which the PDSCH is not mapped is identified by a field of the DCI.

2. The method of claim 1, wherein in determining the PDSCH resource, the UE assumes that the PDSCH is mapped to ZP CSI-RS resources other than the one ZP CSI-RS resource identified by the field of the DCI.

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

4. The method of claim 1, further comprising:

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

5. The method of claim 4, wherein each of the one or more IMRs exists within any one of the multiple ZP CSI-RS resources.

6. The method of claim 1, wherein the field in the DCI has a length of 2 bits.

7. The method of claim 1, wherein the field in the DCI specifies a non-zero power CSI-RS (NZP CSI-RS) resource among multiple NZP CSI-RS resources configured in the UE.

8. 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 obtains data from the PDSCH resource,

wherein the one ZP CSI-RS resource to which the PDSCH is not mapped is identified by a field of the DCI.

9. The UE of claim 8, wherein in determining the PDSCH resource, the processor assumes that the PDSCH is mapped to ZP CSI-RS resources other than the one ZP CSI-RS resource identified by the field of the DCI.

10. The UE of claim 8, wherein the multiple ZP CSI-RS resources are associated with a coordinated multi-point (CoMP) operation.

11. The UE of claim 8, wherein the receiver receives information on one or more interference measurement resources (IMRs) via radio resource control (RRC) signaling.

12. The UE of claim 11, wherein each of the one or more IMRs exists within any one of the multiple ZP CSI-RS resources.

13. The UE of claim 10, wherein the field in the DCI has a length of 2 bits.

14. The UE of claim 8, wherein the field in the DCI specifies a non-zero power CSI-RS (NZP CSI-RS) resource among multiple NZP CSI-RS resources configured in the UE.