CHANNEL STATUS INFORMATION FEEDBACK METHOD AND APPARATUS IN WIRELESS COMMUNICATION SYSTEM WITH RELAY STATION

• US 20120147794A1
• Filed: 09/07/2010
• Published: 06/14/2012
• Est. Priority Date: 09/07/2009
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Chung, Jae Hoon, Park, Kyu Jin, Moon, Sung Ho, Ko, Hyun Soo
• Granted Patent: US 8,848,597 B2
• Time in Patent Office: Days
• US Class Current: 370/280
• CPC Class Codes: H04L 5/001 the frequencies being arranged in component carriers
• CPC Class Codes: H04L 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/1469 using time-sharing
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 72/20 Control channels or signalling for resource management
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

The present invention relates to a wireless communication system, and more particularly, to a channel status information feedback method and apparatus in a wireless communication system with a relay station. The method for transmitting channel status information according to one embodiment of the present invention comprises: receiving a backhaul downlink signal from a base station; generating channel status information based on the backhaul downlink signal; and transmitting the channel status information via a backhaul uplink subframe, wherein the backhaul uplink subframe to which the channel status information is transmitted can be determined based on a subframe index without a designated backhaul downlink subframe and a backhaul uplink transmission timing relation.

Claims

1. A method for transmitting channel status information at a relay node, the method comprising:

receiving a Backhaul downlink signal from a base station;

generating channel status information based upon the Backhaul downlink signal; and

transmitting the channel status information through a Backhaul uplink subframe,

wherein the Backhaul uplink subframe through which the channel status information is transmitted is decided based upon a subframe index to which a Backhaul downlink subframe is not designated and a Backhaul uplink transmission timing relation.

2. The method of claim 1, wherein the Backhaul uplink transmission timing relation corresponds to a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission.

3. The method of claim 2, wherein the Backhaul uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #0, #1, #2, #5, #6, and #7 when FDD (Frequency Division Duplex) is applied, and corresponds to one of subframe indexes #1, #2, #3, #6, #7, and #8 when TDD (Time Division Duplex) is applied.

4. The method of claim 1, wherein the Backhaul uplink transmission timing relation corresponds to a timing relation between a Backhaul uplink data transmission and a Backhaul downlink acknowledgement response.

5. The method of claim 4, wherein the Backhaul uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #2, #3, #4, #7, #8, and #9 when FDD is applied, and corresponds to one of subframe indexes #0, #3, #4, #5, #8, and #9 when TDD is applied.

6. The method of claim 1, wherein the subframe index to which the Backhaul downlink subframe is not designated corresponds to at least one of subframe indexes #0, #4, #5, and #9 when FDD is applied, and corresponds to at least one of subframe indexes #0, #1, #5, and #6 when TDD is applied.

7. The method of claim 1, wherein the Backhaul uplink transmission timing relation includes a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission and a timing relation between a Backhaul uplink data transmission and a Backhaul downlink acknowledgement response, and

wherein the Backhaul uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #2 and #7 when FDD is applied, and corresponds to one of subframe indexes #3 and #8 when TDD is applied.

8. The method of claim 1, wherein the Backhaul uplink subframe through which the channel status information is transmitted is set up as a starting point of a periodic transmission of the channel status information.

9. The method of claim 1, wherein information on the Backhaul uplink subframe through which the channel status information is transmitted and information on a cycle period of the channel status information transmission are notified through higher-layer signaling or L1/L2 control signaling from the base station.

10. A method of for transmitting channel status information at a user equipment, the method comprising:

receiving an Access downlink signal from a relay node;

generating channel status information based upon the Access downlink signal; and

transmitting the channel status information through an Access uplink subframe,

wherein the Access uplink subframe through which the channel status information is transmitted is decided based upon a subframe index to which a Backhaul downlink subframe is not designated and a Backhaul uplink transmission timing relation.

11. The method of claim 10, wherein the Backhaul uplink transmission timing relation corresponds to a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission.

12. The method of claim 11, wherein the Access uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #3, #4, #8, and #9 when FDD (Frequency Division Duplex) is applied, and corresponds to one of subframe indexes #0, #4, #5, and #9 when TDD (Time Division Duplex) is applied.

13. The method of claim 10, wherein the Backhaul uplink transmission timing relation corresponds to a timing relation between a Backhaul uplink data transmission and a Backhaul downlink acknowledgement response.

14. The method of claim 13, wherein the Access uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #0, #1, #5, and #6 when FDD is applied, and corresponds to one of subframe indexes #1, #2, #6, and #7 when TDD is applied.

15. The method of claim 10, wherein the subframe index to which the Backhaul downlink subframe is not designated corresponds to one of subframe indexes #0, #4, #5, and #9 when FDD is applied, and corresponds to one of subframe indexes #0, #1, #5, and #6 when TDD is applied.

16. The method of claim 10, wherein the Backhaul uplink transmission timing relation includes a timing relation between a Backhaul uplink grant and a Backhaul uplink data transmission and a timing relation between a Backhaul uplink data transmission and a Backhaul downlink acknowledgement response, and

wherein the Access uplink subframe through which the channel status information is transmitted corresponds to one of subframe indexes #0, #1, #3, #4, #5, #6, #8, and #9 when FDD is applied, and corresponds to one of subframe indexes #0, #1, #2, #4, #5, #6, #7, and #9 when TDD is applied.

17. The method of claim 10, wherein the Access uplink subframe through which the channel status information is transmitted is set up as a starting point of a periodic transmission of the channel status information.

18. The method of claim 10, wherein information on the Access uplink subframe through which the channel status information is transmitted and information on a cycle period of the channel status information transmission are notified through higher-layer signaling or L1/L2 control signaling from the relay node.

19. A relay node transmitting channel status information, the relay node comprising:

a receiving module configured to receive a Backhaul downlink signal from a base station and to receive an Access uplink signal from a user equipment;

a transmitting module configured to transmit a Backhaul uplink signal to the base station and to transmit an Access downlink signal to the user equipment; and

a processor configured to control the receiving module and the transmitting module,

wherein the processor is configured to;

generate channel status information based upon the Backhaul downlink signal received through the receiving module, and

transmit the channel status information through a Backhaul uplink subframe through the transmitting module, and

wherein a Backhaul uplink subframe through which the channel status information is transmitted is decided based upon a timing relation between a subframe index to which a Backhaul downlink subframe is not designated and Backhaul uplink transmission.

20. A user equipment transmitting channel status information, the user equipment comprising:

a receiving module configured to receive an Access downlink signal from a relay node;

a transmitting module configured to transmit an Access uplink signal to the relay node; and

a processor configured to control the receiving module and the transmitting module,

wherein the processor is configured to;

generate channel status information based upon the Access downlink signal received through the receiving module, and

transmit the channel status information through an Access uplink subframe through the transmitting module, and

wherein an Access uplink subframe through which the channel status information is transmitted is decided based upon a timing relation between a subframe index to which a Backhaul downlink subframe is not designated and Backhaul uplink transmission.