METHOD FOR TRANSMITTING CHANNEL QUALITY INFORMATION, AND APPARATUS FOR SAME

• US 20120218968A1
• Filed: 11/01/2010
• Published: 08/30/2012
• Est. Priority Date: 11/05/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Ki Jun, Kim, Eun Sun, Seo, Han Byul, Kim, Hak Seong
• Granted Patent: US 9,461,718 B2
• Time in Patent Office: Days
• US Class Current: 370/329
• CPC Class Codes: H04B 1/40 Circuits
• CPC Class Codes: H04B 7/022 Site diversity; Macro-diversity using two or more spaced independent antennas H04B7/04
• 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 7/063 Parameters other than those covered in groups H04B7/0623 - H04B7/0634, e.g. channel matrix rank or transmit mode selection
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]
• CPC Class Codes: H04B 7/0639 Using selective indices, e.g. of a codebook, e.g. pre-distortion matrix index [PMI] or for beam selection
• CPC Class Codes: H04B 7/0645 Variable feedback
• CPC Class Codes: H04L 5/0053 Allocation of signaling, i.e. of overhead other than pilot signals

Abstract

The present invention relates to a wireless communication system. In particular, the present invention relates to a method and apparatus for transmitting channel quality information using a terminal, wherein the method comprises the steps of: receiving CoMP configuration information from a serving transmission point; receiving a downlink signal from a plurality of transmission points; and transmitting channel quality information on one or more downlink sub-bands for each transmission point to the serving transmission point, wherein the plurality of transmission points select the same one or more downlink sub-bands in consideration of the CoMP configuration information.

Claims

1. A method for transmitting channel quality information from a user equipment in a wireless communication system that supports coordinated multiple point transmission and reception (CoMP), the method comprising the steps of:

receiving CoMP configuration information from a serving transmission point;

receiving a downlink signal from a plurality of transmission points; and

transmitting channel quality information on one or more downlink subbands per transmission point to the serving transmission point,

wherein the one or more downlink subbands are selected equally for the plurality of transmission points by considering the CoMP configuration information.

2. The method according to claim 1, wherein the CoMP configuration information includes CoMP mode information indicating dynamic cell selection (DCS), joint processing (JP), or cooperative scheduling/cooperative beamforming (CS/CB), and the one or more downlink subbands are selected considering the CoMP mode information.

3. The method according to claim 1, when the CoMP configuration information includes a flag field indicating action of the transmission point, and the one or more downlink subbands are selected considering a value of the flag field.

4. The method according to claim 3, wherein, if the value of the flag field indicates a data transmission point, a downlink signal of the corresponding transmission point is regarded as an effective signal during the step of selecting the one or more downlink subbands, and if the value of the flag field indicates a beam avoidance point, a downlink signal of the corresponding transmission point is regarded as noise or interference during the step of selecting the one or more downlink subbands.

5. The method according to claim 3, wherein the flag field includes 1-bit information indicating whether the corresponding transmission point is a data transmission point or a beam avoidance point.

6. The method according to claim 3, wherein the serving transmission point is previously set to the data transmission point, and the flag field is set for a neighboring transmission point only.

7. A user equipment configured to transmit channel quality information in a wireless communication system that supports coordinated multiple point transmission and reception (CoMP), the user equipment comprising:

a radio frequency (RF) unit; and

a processor receiving CoMP configuration information from a serving transmission point, receiving a downlink signal from a plurality of transmission points, and transmitting channel quality information on one or more downlink subbands per transmission point to the serving transmission point,

wherein the one or more downlink subbands are selected equally for the plurality of transmission points by considering the CoMP configuration information.

8. The user equipment according to claim 7, wherein the CoMP configuration information includes CoMP mode information indicating dynamic cell selection (DCS), joint processing (JP), or cooperative scheduling/cooperative beamforming (CS/CB), and the one or more downlink subbands are selected considering the CoMP mode information.

9. The user equipment according to claim 7, when the CoMP configuration information includes a flag field indicating action of the transmission point, and the one or more downlink subbands are selected considering a value of the flag field.

10. The user equipment according to claim 9, wherein, if the value of the flag field indicates a data transmission point, a downlink signal of the corresponding transmission point is regarded as an effective signal during the step of selecting the one or more downlink subbands, and if the value of the flag field indicates a beam avoidance point, a downlink signal of the corresponding transmission point is regarded as noise or interference during the step of selecting the one or more downlink subbands.

11. The user equipment according to claim 9, wherein the flag field includes 1-bit information indicating whether the corresponding transmission point is a data transmission point or a beam avoidance point.

12. The user equipment according to claim 9, wherein the serving transmission point is previously set to the data transmission point, and the flag field is set for a neighboring transmission point only.