Method and apparatus for measuring channel state information in communication system

Patent metadata

Field	Value
Publication number	US-2016269160-A1
Application number	US-201615069210-A
Country	US
Kind code	A1
Filing date	Mar 14, 2016
Priority date	Mar 13, 2015
Publication date	Sep 15, 2016
Grant date	—

Abstract

A method for reporting channel state information by a terminal in a multiple access based communication system is provided. The method includes determining a most favored direction with a highest signal quality with respect to a reference signal received from a base station and determining, as a reported object, some channel directions including the most favored direction among channel directions formed together with the base station, identifying a channel quality information group including channel quality information corresponding to the some channel directions among channel quality information groups classified according to a distance measured with respect to the most favored direction, and transmitting the identified channel quality information group to the base station.

First claim

What is claimed is:

1 . A method for transmitting channel state information by a terminal in a communication system, the method comprising:
receiving a control channel repeatedly transmitted corresponding to a predetermined number of subframes for a terminal using part of a bandwidth allocated by a base station; identifying at least one reference frame for measuring aperiodic channel state information included in system information received from the base station among the subframes based on resource allocation information indicating the reference frame; when receiving a report request of the aperiodic channel state information through the control channel, measuring channel state information using a resource obtained through the at least one reference frame; and transmitting the channel state information to a base station during an uplink transmission period.

2 . The method of claim 1 , wherein the uplink transmission period starts in a temporal section corresponding to predetermined subframes after the number of the subframes.

3 . The method of claim 1 , wherein the system information includes at least one of the number of the subframes and start subframe information on a control channel transmitted to the terminal using the part of the bandwidth.

4 . The method of claim 1 , wherein the at least one reference frame is configured differently per terminal or configured as a common subframe in a cell of the base station, and
wherein the at least one reference frame is set to a last subframe among subframes succeeding in reception among the subframes.

5 . The method of claim 1 , wherein the control channel starts transmission in any subframe among subframes configuring the allocated bandwidth.

6 . A method for receiving channel state information by a base station in a communication system, the method comprising:
configuring at least one reference subframe for measuring aperiodic channel state information of a terminal using part of an allocated bandwidth; transmitting control information including a request for the aperiodic channel state information through a control channel for the terminal repeatedly transmitted corresponding to a predetermined number of subframes; and receiving channel state information measured using a resource obtained through the at least one reference subframe from the terminal.

7 . The method of claim 6 , wherein the channel state information is received through an uplink transmission period of the terminal started in a subframe next to a temporal section corresponding to predetermined subframes after the number of the subframes.

8 . The method of claim 6 , further comprising transmitting system information including the at least one reference subframe information to the terminal, wherein the system information includes at least one of the number of the subframes and start subframe information on a control channel transmitted to the terminal using the part of the bandwidth.

9 . The method of claim 6 , wherein the configuring of the at least one reference subframe includes configuring the at least one reference subframe differently per terminal or configuring as a common subframe in a cell of the base station, and
wherein the configuring of the at least one reference subframe includes setting the at least one reference subframe to a last subframe among subframes succeeding in reception among the subframes.

10 . The method of claim 6 , wherein the control channel starts transmission in any subframe among subframes configuring the allocated bandwidth.

11 . A terminal transmitting channel state information in a communication system, the terminal comprising:
a receiver configured to receive a control channel repeatedly transmitted corresponding to a predetermined number of subframes for a terminal using part of a bandwidth allocated by a base station; a controller configured to:
identify at least one reference frame for measuring aperiodic channel state information included in system information received from the base station among the subframes based on resource allocation information indicating the reference frame, and
when receiving a report request of the aperiodic channel state information through the control channel, measure channel state information using a resource obtained through the at least one reference frame; and
a transmitter configured to transmit the channel state information to a base station during an uplink transmission period.

12 . The terminal of claim 11 , wherein the uplink transmission period starts in a temporal section corresponding to predetermined subframes after the number of the subframes.

13 . The terminal of claim 11 , wherein the system information includes at least one of the number of the subframes and start subframe information on a control channel transmitted to the terminal using the part of the bandwidth.

14 . The terminal of claim 11 , wherein the at least one reference frame is configured differently per terminal or configured as a common subframe in a cell of the base station, and
wherein the at least one reference frame is set to a last subframe among subframes succeeding in reception among the subframes.

15 . The terminal of claim 11 , wherein the control channel starts transmission in any subframe among subframes configuring the allocated bandwidth.

16 . A base station receiving channel state information in a communication system, the base station comprising:
a controller configured to configure at least one reference subframe for measuring aperiodic channel state information of a terminal using part of an allocated bandwidth; a transmitter configured to transmit control information including a request for the aperiodic channel state information through a control channel for the terminal repeatedly transmitted corresponding to a predetermined number of subframes; and a receiver configured to receive channel state information measured using a resource obtained through the at least one reference subframe from the terminal.

17 . The base station of claim 16 , wherein the channel state information is received through an uplink transmission period of the terminal started in a subframe next to a temporal section corresponding to predetermined subframes after the number of the subframes.

18 . The base station of claim 16 , wherein the controller is further configured to control the transmitter to transmit system information including the at least one reference subframe information to the terminal, and wherein the system information includes at least one of the number of the subframes and start subframe information on a control channel transmitted to the terminal using the part of the bandwidth.

19 . The base station of claim 16 , wherein the controller is further configured to configure the at least one reference frame differently per terminal or as a common subframe in a cell of the base station, and
wherein the controller is further configured to set the at least one reference frame to a last subframe among subframes succeeding in reception among the subframes.

20 . The base station of claim 16 , wherein the control channel starts transmission in any subframe among subframes configuring the allocated bandwidth.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Noh Hoon-Dong
• Kim Dong-Han
• Kim Young-Bum
• Kwak Young-Woo
• Shin Cheol-Kyu
• Kim Youn-Sun
• Oh Jin-Young
• Choi Seung-Hoon
• Ro Sang-Min
• Lee Ju-Ho

Classifications

• H04L5/0064

  Rate requirement of the data, e.g. scalable bandwidth, data priority · CPC title

• H04B7/0456

  Selection of precoding matrices or codebooks, e.g. using matrices antenna weighting · CPC title

• H04B7/0632

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

• H04L5/0082

  at predetermined intervals · CPC title

• H04L5/0094

  Indication of how sub-channels of the path are allocated · CPC title