Reference signal measurement method and apparatus for use in wireless communication system including plural base stations with distributed antennas

Patent metadata

Field	Value
Publication number	US-9320046-B2
Application number	US-201514690971-A
Country	US
Kind code	B2
Filing date	Apr 20, 2015
Priority date	May 22, 2012
Publication date	Apr 19, 2016
Grant date	Apr 19, 2016

Abstract

An apparatus and a method of measuring a reference signal for efficient downlink transmission in a mobile communication system are provided. The system includes plural base stations, each having a plurality of antennas distributed in the service area thereof based on a Distributed Antenna System (DAS). A method for a base station to notify a terminal of reference signal measurement information in a mobile communication system comprises determining whether the terminal is in a Rank Indicator/Precoding Matrix Indicator (RI/PMI) disabled mode, selecting, when the terminal is in the RI/PMI disabled mode, the reference signal to be measured by the terminal between a Cell-specific Reference Signal (CRS) and a Channel Status Information Reference Signal (CSI-RS), notifying the terminal of the reference signal measurement information with the selection result, and receiving channel information generated based on the reference signal measurement information from the terminal.

First claim

What is claimed is:

1. A method for a terminal in a mobile communication system, the method comprising:
receiving information on a rank indicator/precoding matrix indicator (RI/PMI) disabled mode for the terminal from a base station;
determining whether configuration information on measuring the channel is received;
identifying a reference signal for measuring the channel between a cell-specific reference signal (CRS) and a channel status information reference signal (CSI-RS) based on a result of the determination; and
generating channel information based on the identified reference signal.

2. The method of claim 1 , wherein the configuration information comprises interference measurement resource information.

3. The method of claim 2 , wherein the generating of the channel information comprises:
generating the channel information based on the CSI-RS if the interference measurement resource information is received.

4. The method of claim 2 , wherein the generating of the channel information comprises:
generating the channel information based on the CRS if the interference measurement resource information is not received.

5. The method of claim 2 , wherein the interference measurement resource information corresponds to a transmission mode of the terminal.

6. A method for a base station in a mobile communication system, the method comprising:
transmitting information on a rank indicator/precoding matrix indicator (RI/PMI) disabled mode for a terminal to the terminal;
determining whether to transmit configuration information on measuring the channel to the terminal; and
receiving channel information generated based on a result of the determination from the terminal.

7. The method of claim 6 , wherein the configuration information comprises interference measurement resource information.

8. The method of claim 7 , the receiving of the channel information comprises:
receiving the channel information generated based on the CSI-RS if the interference measurement resource information is transmitted.

9. The method of claim 7 , the receiving of the channel information comprises:
receiving the channel information generated based on the CRS if the interference measurement resource information is not transmitted.

10. The method of claim 6 , wherein the interference measurement resource information corresponds to a transmission mode of the terminal.

11. A terminal in a mobile communication system, the terminal comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured:
to receive information on a rank indicator/precoding matrix indicator (RI/PMI) disabled mode for the terminal from a base station,
to determine whether configuration information on measuring the channel is received,
to identify a reference signal for measuring the channel between a cell-specific reference signal (CRS) and a channel status information reference signal (CSI-RS) based on a result of the determination, and
to generate channel information based on the identified reference signal.

12. The terminal of claim 11 , wherein the configuration information comprises interference measurement resource information.

13. The terminal of claim 12 , wherein the controller is further configured to generate the channel information based on the CSI-RS if the interference measurement resource information is received.

14. The terminal of claim 12 , wherein the controller is further configured to generate the channel information based on the CRS if the interference measurement resource information is not received.

15. The terminal of claim 12 , wherein the interference measurement resource information corresponds to a transmission mode of the terminal.

16. A base station in a mobile communication system, the base station comprising:
a transceiver configured to transmit and receive a signal; and
a controller configured:
to transmit information on a rank indicator/precoding matrix indicator (RI/PMI) disabled mode for a terminal to the terminal,
to determine whether to transmit configuration information on measuring the channel to the terminal, and
to receive channel information generated based on a result of the determination from the terminal.

17. The base station of claim 16 , wherein the configuration information comprises interference measurement resource information.

18. The base station of claim 17 , wherein the controller is further configured to receive the channel information generated based on the CSI-RS if the interference measurement resource information is transmitted.

19. The base station of claim 17 , wherein the controller is further configured to receive the channel information generated based on the CRS if the interference measurement resource information is not transmitted.

20. The base station of claim 16 , wherein the interference measurement resource information corresponds to a transmission mode of the terminal.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Kim Younsun
• Kim Youngbum
• Lee Juho
• Lee Hyojin
• Cho Joonyoung
• Ji Hyoungju
• Choi Seunghoon

Classifications

• H04W72/23

  in the downlink direction of a wireless link, i.e. towards a terminal · CPC title

• H04W72/541 Primary

  using the level of interference · CPC title

• H04B7/0632

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

• H04B7/063

  Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection · CPC title