Method and apparatus for transreceiving channel state information in wireless communication system

Patent metadata

Field	Value
Publication number	US-2016112102-A1
Application number	US-201414893865-A
Country	US
Kind code	A1
Filing date	Jul 25, 2014
Priority date	Jul 25, 2013
Publication date	Apr 21, 2016
Grant date	—

Abstract

The present invention relates to a wireless communication system. A method for a terminal reporting channel state information in a wireless communication system, according to one embodiment of the present invention, comprises the steps of: receiving, from a second cell interfering with communication between a first cell and the terminal, a second precoding matrix indicator (PMI) determined based on the interference; and transmitting, to the first cell, the second PMI and a channel quality indicator (CQI).

First claim

What is claimed is:

1 . A method of reporting a channel state information (CSI) by a user equipment in a wireless communication system, the method comprising:
receiving, from a 2 nd cell causing interference to communication between a 1 st cell and the user equipment, a 2 nd PMI (precoding matrix indicator) determined based on the interference; and transmitting the 2 nd PMI and a CQI (channel quality indicator) to the 1 st cell.

2 . The method of claim 1 , further comprising:
receiving a DCI (downlink control information) including a 1-bit flag, wherein if the 1-bit flag corresponds to a 1 st value, a remaining payload of the DCI comprises the 2 nd PMI, and wherein if the 1-bit flag corresponds to a 2 nd value, the remaining payload of the DCI comprises scheduling information.

3 . The method of claim 1 ,
wherein the CQI is calculated based on a 1 st CSI process of the 1 st cell and a 2 nd CSI process of the 2 nd cell.

4 . The method of claim 3 ,
wherein a same IMR (interference measurement resource) is used in the 1 st CSI process and the 2 nd CSI process.

5 . The method of claim 1 ,
wherein the 2 nd PMI is received through an EPDCCH (enhanced physical downlink control channel).

6 . The method of claim 5 ,
wherein a CSI process used for feedback of the 2 nd PMI is determined using a state of PQI (PDSCH RE mapping and quasi co-location indicator) connected to a set of EPDCCHs of the 2 nd cell.

7 . The method of claim 1 ,
wherein, after the 2 nd PMI is received from the 2 nd cell, the 2 nd PMI is transmitted to the 1 st cell through a first PUSCH (physical uplink shared channel).

8 . A user equipment for reporting a channel state information (CSI) in a wireless communication system, a user equipment comprising:
a radio frequency (RF) unit; and a processor, wherein the processor is configured: to receive, from a 2 nd cell causing interference to communication between a 1 st cell and the user equipment, a 2 nd PMI (precoding matrix indicator) determined based on the interference, to transmit the 2 nd PMI and a CQI (channel quality indicator) to the 1 st cell.

9 . The user equipment of claim 8 ,
wherein the processor is further configured to receive a DCI (downlink control information) including a 1-bit flag, wherein if the 1-bit flag corresponds to a 1 st value, a remaining payload of the DCI comprises the 2 nd PMI, and wherein if the 1-bit flag corresponds to a 2 nd value, the remaining payload of the DCI comprises scheduling information.

10 . The user equipment of claim 8 ,
wherein the CQI is calculated based on a 1 st CSI process of the 1 st cell and a 2 nd CSI process of the 2 nd cell.

11 . The user equipment of claim 10 ,
wherein a same IMR (interference measurement resource) is used in the 1 st CSI process and the 2 nd CSI process.

12 . The user equipment of claim 8 ,
wherein the 2 nd PMI is received through an EPDCCH (enhanced physical downlink control channel).

13 . The user equipment of claim 12 ,
wherein a CSI process used for feedback of the 2 nd PMI is determined using a state of PQI (PDSCH RE mapping and quasi co-location indicator) connected to a set of EPDCCHs of the 2 nd cell.

14 . The user equipment of claim 8 ,
wherein, after the 2 nd PMI is received from the 2 nd cell, the 2 nd PMI is transmitted to the 1 st cell through a first PUSCH (physical uplink shared channel).

Assignees

• Lg Electronics Inc

Inventors

• Kim Hyungtae
• Park Jonghyun
• Seo Hanbyul
• Kim Kijun

Classifications

• H04B7/024

  Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems · CPC title

• H04B7/2656

  for structure of frame, burst · CPC title

• H04B7/0632

  Channel quality parameters, e.g. channel quality indicator [CQI] · CPC title

• H04B7/0626

  Channel coefficients, e.g. channel state information [CSI] · CPC title

• H04B7/0639

  Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection · CPC title