METHOD AND APPARATUS FOR TRANSMITTING AN UPLINK SIGNAL BY A RELAY IN A WIRELESS COMMUNCATION SYSTEM

• US 20130294282A1
• Filed: 01/19/2012
• Published: 11/07/2013
• Est. Priority Date: 01/23/2011
• Status: Abandoned Application

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Hanbyul
• Application Number:
  US13/980,227
• Publication Number:
  US 20130294282A1
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/15542 Selecting at relay station its transmit and receive resources selection of wireless resources by user or terminal H04W72/02; arrangements affording multiple use of the transmission path by two-dimensional division of the resources H04L5/0003, or by allocating sub-channels H04L5/003
• CPC Class Codes: H04L 5/0048 Allocation of pilot signals, i.e. of signals known to the receiver
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04L 5/0073 Allocation arrangements that take into account other cell interferences for intercell interference mitigation or co-ordination in orthogonal multiplex systems H04J11/005
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

The present invention relates to a wireless communication system, and to a method and apparatus for transceiving an uplink signal by a relay in a wireless communication system. According to the present invention, a scheme, in which the relay may correctly determine a reference resource for channel state information (CSI) calculation, and thus may perform accurate CSI transmission, may be provided. In addition, according to the present invention, a scheme, in which the relay may correctly determine timing for transmitting a sounding reference signal (SRS) based on the instruction of a base station and may perform SRS transmission, may be provided.

Claims

1. A method for transmitting Channel State Information (CSI) at a relay in a wireless communication system, the method comprising:

determining a reference resource for CSI calculation; and

calculating CSI in the reference resource and transmitting the calculated CSI in subframe n to a Base Station (BS),

wherein the reference resource is located in subframe n−

k where k is a smallest value equal to or greater than 4, determined so that subframe n−

k corresponds to a subframe configured for transmission from the BS to the relay.

2. The method according to claim 1, wherein subframe n−

k is a subframe configured to carry a Physical Downlink Shared Channel (PDSCH) from the BS to the relay.

3. The method according to claim 1, wherein subframe n−

k is configurable as a Multicast Broadcast Single Frequency Network (MBSFN) subframe by the RN.

4. The method according to claim 1, wherein the CSI is transmitted periodically or aperiodically.

5. The method according to claim 1, wherein the wireless communication system is a Time Division Duplexing (TDD) system or a Frequency Division Duplexing (FDD) system.

6. The method according to claim 1, wherein the CSI includes a Channel Quality Indicator (CQI) and the CQI is calculated to be a value that makes a PDSCH receivable in the reference resource with an error probability not exceeding a predetermined error probability.

7. The method according to claim 1, wherein the relay is a User Equipment (UE) that can communicate with the BS and another UE.

8. The method according to claim 1, wherein the subframe configured for transmission from the BS to the relay is indicated by a higher layer.

9. A relay for transmitting Channel State Information (CSI) in a wireless communication system, the relay comprising:

a reception module for receiving a downlink signal from a Base Station (BS);

a transmission module for transmitting an uplink signal to the BS; and

a processor for controlling the relay including the reception module and the transmission module,

wherein the processor is configured to determine a reference resource for CSI calculation, to calculate the CSI in the reference resource, and to transmit the calculated CSI in subframe n to the BS through the transmission module, and

wherein the reference resource is located in subframe n−

k where k is a smallest value equal to or greater than 4, determined so that subframe n−

k corresponds to a subframe configured for transmission from the BS to the relay.

10. A method for transmitting a Sounding Reference Signal (SRS) at a relay in a wireless communication system, the method comprising:

receiving control information triggering SRS transmission in subframe n from a Base Station (BS);

determining subframe n+k for SRS transmitting; and

transmitting an SRS in subframe n+k to the BS,

wherein k is a smallest value equal to or greater than 4, determined so that subframe n+k corresponds to a subframe configured for SRS transmission and a subframe configured for transmission from the relay to the BS.

11. The method according to claim 10, wherein the SRS is transmitted aperiodically.

12. The method according to claim 10, wherein the wireless communication system is a Time Division Duplexing (TDD) system or a Frequency Division Duplexing (FDD) system.

13. The method according to claim 10, wherein the relay is a User Equipment (UE) that can communicate with the BS and another UE.

14. The method according to claim 10, wherein the subframe configured for transmission from the relay to the BS is indicated by a higher layer or the subframe configured for transmission from the relay to the BS is determined implicitly from a subframe configured for transmission from the BS to the relay indicated by the higher layer.

15. A relay for transmitting a Sounding Reference Signal (SRS) in a wireless communication system, the relay comprising:

a reception module for receiving a downlink signal from a Base Station (BS);

a transmission module for transmitting an uplink signal to the BS; and

a processor for controlling the relay including the reception module and the transmission module,

wherein the processor is configured to receive control information triggering SRS transmission in subframe n from the BS through the reception module, to determine subframe n+k for SRS transmission, and to transmit an SRS in subframe n+k to the BS through the transmission module, and

wherein k is a smallest value equal to or greater than 4, determined so that subframe n+k corresponds to a subframe configured for SRS transmission and a subframe configured for transmission from the relay to the BS.