RELAY STATION IN RADIO COMMUNICATION SYSTEM AND OPERATING METHOD FOR THE RELAY STATION

• US 20110128883A1
• Filed: 07/30/2009
• Published: 06/02/2011
• Est. Priority Date: 07/30/2008
• Status: Active Grant

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Park, Kyu Jin, Han, Seung Hee, Lee, Moon Il, Chung, Jae Hoon
• Granted Patent: US 9,048,924 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/155 Ground-based stations H04B7/204 takes precedence
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 72/23 in the downlink direction of a wireless link, i.e. towards a terminal
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

A method for operating a relay station in a wireless communication system includes: obtaining information regarding assigned subframes among a plurality of subframes; monitoring a PDCCH (Physical Downlink Control Channel) carrying information regarding a radio resource allocation within the assigned subframes; and receiving data from a base station on the basis of the radio resource allocation of the monitored PDCCH. The relay station may operate to guarantee compatibility with an existing terminal in a wireless communication system. Also, a method for assigning radio resources between a base station and the relay station is defined.

Claims

1. A method for operating a relay station in a wireless communication system, the method comprising:

obtaining information regarding assigned subframes among a plurality of subframes;

monitoring a Physical Downlink Control Channel (PDCCH) carrying information regarding a radio resource allocation within the assigned subframes; and

receiving data from a base station on the basis of the radio resource allocation of the monitored PDCCH.

2. The method of claim 1, wherein when data is received from the base station through a frequency band in the assigned subframes, the relay station does not transmit data to a user equipment (UE) through the frequency band in the assigned subframes.

3. The method of claim 1, wherein the information regarding the assigned subframes is information regarding subframes at fixed positions within a certain number of contiguous radio frames.

4. The method of claim 3, wherein the information regarding the radio resource allocation is information regarding a frequency band at a fixed position within the subframes at the fixed positions.

5. The method of claim 3, wherein the information regarding the radio resource allocation is information regarding a frequency band determined for each of the subframes at the fixed positions.

6. The method of claim 3, wherein the information regarding the assigned subframes is obtained through a portion of system information or an RRC (Radio Resource Control) message received from the base station.

7. The method of claim 1, wherein a Cyclic Redundancy Check (CRC) of the monitored PDCCH is masked by an unique identifier of the relay station.

8. The method of claim 1, wherein, in monitoring the PDCCH, the PDCCH is monitored by Control Channel Element (CCE) set on the basis of a search start point.

9. The method of claim 8, wherein the search start point is defined on the basis of the unique identifier of the relay station.

10. The method of claim 8, wherein the search start point is fixed.

11. A relay station comprising:

an RF unit configured to transmit and receive a radio signal; and

a processor connected to the RF unit,

wherein the processor obtains information regarding assigned subframes among a plurality of subframes, monitors a Physical Downlink Control Channel (PDCCH) carrying information regarding a radio resource allocation within the assigned subframes, and receives data from a base station on the basis of the radio resource allocation of the monitored PDCCH.