METHOD FOR REPORTING A CHANNEL QUALITY INDICATOR BY A RELAY NODE IN A WIRELESS COMMUNICATION SYSTEM, AND APPARATUS FOR SAME

• US 20130083719A1
• Filed: 09/05/2011
• Published: 04/04/2013
• Est. Priority Date: 09/30/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Seo, Inkwon, Seo, Hanbyul, Kim, Kijun, Kim, Hakseong
• Granted Patent: US 9,730,183 B2
• Time in Patent Office: Days
• US Class Current: 370/312
• CPC Class Codes: H04B 17/24 with feedback of measurements to the transmitter
• CPC Class Codes: H04L 5/0057 Physical resource allocation for CQI
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information
• CPC Class Codes: H04W 72/0446 Resources in time domain, e.g. slots or frames
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 72/30 Resource management for broadcast services
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

The present invention relates to a method for reporting a channel quality indicator for a relay node-dedicated physical downlink shared channel (R-PDSCH) from a base station by a relay node in a wireless communication system. More particularly, the method comprises the following steps: receiving one or more reference signals from the base station; calculating a channel quality indicator for the R-PDSCH on the basis of one or more reference signals; and reporting the channel quality indicator to the base station.

Claims

1-17. -17. (canceled)

18. A method for reporting a channel quality indicator at a user equipment (UE) in a wireless communication system, the method comprising:

receiving one or more common reference signals (CRSs) from a base station;

computing a channel quality indicator (CQI) for a specific transmission mode of a physical downlink shared channel (PDSCH) based on the one or more CRSs; and

reporting the CQI for the specific transmission mode to the base station,

wherein both MBSFN (Multicast Broadcast Single Frequency Network) subframe and non-MBSFN subframe are valid subframes to compute the CQI for the specific transmission mode,

wherein the UE computes the CQI for the specific transmission mode under assumption that resource elements (REs) of the one or more CRSs are in the MBSFN subframe as the non-MBSFN subframe.

19. The method of claim 18, wherein the PDSCH is transmitted based on a DM-RS (Demodulation Reference Signal) from the base station to the UE in the specific transmission mode.

20. The method of claim 18, wherein the MBSFN subframe is an invalid subframe to compute the CQI for other transmission modes.

21. The method of claim 18, wherein the UE computes the CQI for the specific transmission mode under assumption that valid subframes have a predetermined number of available REs for computing the CQI.

22. The method of claim 21, wherein the REs of the one or more CRSs are not used as the available REs for computing the CQI.

23. A user equipment (UE) in a wireless communication system, the UE comprising:

a receiving module for receiving one or more common reference signals (CRSs) from a base station;

a processor for computing a channel quality indicator (CQI) for a specific transmission mode of a physical downlink shared channel (PDSCH) based on the one or more CRSs; and

a transmitting module for reporting the CQI for the specific transmission mode to the base station,

wherein both MBSFN (Multicast Broadcast Single Frequency Network) subframe and non-MBSFN subframe are valid subframes to compute the CQI for the specific transmission mode,

wherein the processor computes the CQI for the specific transmission mode under assumption that resource elements (REs) of the one or more CRSs are in the MBSFN subframe as the non-MBSFN subframe.

24. The UE of claim 23, wherein the PDSCH is transmitted based on a DM-RS (Demodulation Reference Signal) from the base station to the UE in the specific transmission mode.

25. The UE of claim 23, wherein the MBSFN subframe is an invalid subframe to compute the CQI for other transmission modes.

26. The UE of claim 23, wherein the processor computes the CQI for the specific transmission mode under assumption that valid subframes have a predetermined number of available REs for computing the CQI.

27. The UE of claim 26, wherein the REs of the one or more CRSs are not used as the available REs for computing the CQI.