Method of receiving data from base station at relay node in wireless communication system and apparatus thereof

• US 8,923,304 B2
• Filed: 05/18/2011
• Issued: 12/30/2014
• Est. Priority Date: 10/21/2010
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Kim, Hakseong, Seo, Hanbyul
• Primary Examiner(s): MEW, KEVIN D
• Application Number:
  US13/696,045
• Publication Number:
  US 20130064174A1
• Time in Patent Office: 1,322 Days
• Field of Search: 370328-329, 370/330, 370335-336, 370/338, 370341-343, 370/345, 370/389, 370/392, 370400-401, 370436-437, 370441-443, 370/465, 370478-480, 370/498
• US Class Current: 370/400
• CPC Class Codes: H04B 7/14 Relay systems
• CPC Class Codes: H04B 7/15528 Control of operation parameters of a relay station to exploit the physical medium
• 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 5/0023 Time-frequency-space
• CPC Class Codes: H04L 5/0051 of dedicated pilots, i.e. pilots destined for a single user or terminal
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal

Abstract

A method used by a relay node for receiving a relay node specific downlink physical shared channel from a base station in a multiple antennae wireless communication system is disclosed. More specifically, the method includes the steps of demodulating a relay node specific downlink physical control channel (R-PDCCH) by using a relay node specific reference signal; and, in case a specific downlink information is detected from the demodulated relay node specific downlink physical control channel, of demodulating the relay node specific downlink physical shared channel, under an assumption that the relay node specific downlink physical shared channel is transmitted through a single antenna port by using a predetermined antenna port and scrambling identifier (ID). Herein, the specific downlink control information may correspond to a downlink control information designating a Fallback Mode. And, the predetermined antenna port and scrambling ID may respectively correspond to antenna port 7 and scrambling ID 0.

Claims

1. A method for receiving a downlink physical shared channel (PDSCH) from a base station at a relay node in a multiple antenna wireless communication system, the method comprising:

receiving a relay node specific downlink physical control channel (R-PDCCH) and the PDSCH from the base station;

demodulating the R-PDCCH based on one of a relay node specific reference signal or a cell specific reference signal; and

decoding the PDSCH based on a predetermined antenna port and a predetermined scrambling identifier (SCID), if the R-PDCCH is demodulated based on the relay node specific reference signal and a specific downlink information is decoded from the R-PDCCH.

2. The method of claim 1, wherein the relay node specific reference signal is a demodulation-reference signal (DM-RS).

3. The method of claim 2, wherein the predetermined antenna port is one of a plurality of antenna ports defining the DM-RS.

4. The method of claim 1, wherein the predetermined antenna port and the predetermined SCID respectively correspond to antenna port 7 and SCID 0.

5. The method of claim 1, further comprising:

decoding the R-PDCCH using the predetermined antenna port and the predetermined SCID.

6. The method of claim 1, wherein the specific downlink control information is used for scheduling one PDSCH codeword.

7. The method of claim 1, wherein the specific downlink control information does not include information about a transmission rank.

8. The method of claim 1, further comprising:

decoding the PDSCH based on one or more antenna ports configured by a higher layer, if the R-PDCCH is demodulated based on the relay node specific reference signal and other downlink information including information about a transmission rank is decoded from the R-PDCCH.

9. A relay node in a multiple antenna wireless communication system, the relay node comprising:

a receiver configured to receive a relay node specific downlink physical control channel (R-PDCCH) and a downlink physical shared channel (PDSCH) from a base station; and

a processor configured to demodulate the R-PDCCH based on one of a relay node specific reference signal or a cell specific reference signal,

wherein the processor decodes the PDSCH based on a predetermined antenna port and a predetermined scrambling identifier (SCID) if the R-PDCCH is demodulated based on the relay node specific reference signal and a specific downlink information is decoded from the R-PDCCH.

10. The relay node of claim 9, wherein the relay node specific reference signal is a demodulation-reference signal (DM-RS).

11. The relay node of claim 10, wherein the predetermined antenna port is one of a plurality of antenna ports defining the DM-RS.

12. The relay node of claim 9, wherein the predetermined antenna port and the predetermined SCID respectively correspond to antenna port 7 and SCID 0.

13. The relay node of claim 9, wherein the processor decodes the R-PDCCH using the predetermined antenna port and the predetermined SCID.

14. The relay node of claim 9, wherein the specific downlink control information is used for scheduling one PDSCH codeword.

15. The relay node of claim 9, wherein the specific downlink control information does not include information about a transmission rank.

16. The relay node of claim 9, wherein the processor decodes the PDSCH based on one or more antenna ports configured by a higher layer, if the R-PDCCH is demodulated based on the relay node specific reference signal and other downlink information including information about a transmission rank is decoded from the R-PDCCH.