Method of controlling feedback channel in communication system comprising at least one relay station

• US 8,305,952 B2
• Filed: 07/30/2008
• Issued: 11/06/2012
• Est. Priority Date: 07/30/2007
• Status: Expired due to Fees

• Current Assignee: LG Electronics, Inc. (LG Corporation)
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: Youn, Ae Ran, Kim, Yong Ho, Ryu, Ki Seon
• Primary Examiner(s): Pham, Chi
• Assistant Examiner(s): ADHAMI, MOHAMMAD SAJID
• Application Number:
  US12/671,461
• Publication Number:
  US 20100260095A1
• Time in Patent Office: 1,560 Days
• Field of Search: None
• US Class Current: 370/315
• CPC Class Codes: H04L 1/0026 Transmission of channel quality indication
• CPC Class Codes: H04L 1/0029 Reduction of the amount of signalling, e.g. retention of useful signalling or differential signalling power control H04W52/04
• CPC Class Codes: H04L 2001/0097 Relays
• CPC Class Codes: H04L 27/2601 Multicarrier modulation systems
• CPC Class Codes: H04W 24/10 Scheduling measurement reports ; Arrangements for measurement reports

Abstract

A method for controlling a feedback channel in a communication system including a relay station (RS) is disclosed. In a method for controlling transmission/reception of a channel quality information feedback in a wireless communication system including a relay station (RS), the RS receives total channel quality information from a mobile station (MS), transmits the channel quality information to a base station (BS), receives a delta CQI from the mobile station (MS), and transmits the delta CQI to the base station (BS) according to control information.

Claims

1. A feedback control method for channel quality information of a relay station (RS) in a wireless communication system including the relay station (RS), the method comprising:

receiving, by the relay station (RS), total channel quality information from a mobile station (MS) via a first uplink channel resource area;

when an optimized channel quality indicator (CQI) report indicator received from the mobile station (MS) is set to 1, receiving, by the relay station (RS), a plurality of delta information of the channel quality information from the mobile station (MS) via a second uplink channel resource area;

transmitting, by the relay station (RS), at least one of the channel quality information and the plurality of delta information to a base station (BS) if values of the plurality of delta information are continuously smaller than a predetermined value for a predetermined duration of time; and

acquiring, by the relay station (RS), control information by analyzing the at least one of the channel quality information and the plurality of delta information if the values of the plurality delta information are not continuously smaller than the predetermined value for the predetermined duration of time,

wherein the mobile station (MS) communicates directly with the base station (BS) without passing data through the relay station (RS) if the values of the plurality of delta information are continuously smaller than the predetermined value for the predetermined duration of time.

2. The feedback control method according to claim 1, wherein the step of transmitting the at least one of the channel quality information and the plurality of delta information to the base station (BS) comprises:

transmitting the plurality of delta information via another uplink channel resource.

3. The feedback control method according to claim 1, further comprising:

transmitting the acquired control information to the base station (BS) via another uplink channel resource.

4. The feedback control method according to claim 1, further comprising:

transmitting data, in which the at least one of the channel quality information and the plurality of delta information of the channel quality information is reflected, to the mobile station (MS).

5. The feedback control method according to claim 1, further comprising:

transmitting the acquired control information, in which at least one of the channel quality information and delta information of the channel quality information is reflected, to the mobile station (MS).

6. A feedback control method for channel quality information of a mobile station (MS) for supporting a wireless communication system including a relay station (RS), the method comprising:

transmitting, by the mobile station (MS), total channel quality information to the relay station (RS) via a first uplink channel resource area; and

when an optimized channel quality indicator (CQI) report indicator associated with the total channel quality information is set to 1, transmitting, by the mobile station (MS), a plurality of delta information of the channel quality information to the relay station (RS) via a second uplink channel resource area,

wherein the relay station (RS) transmits at least one of the channel quality information and the plurality of delta information to a base station (BS) if values of the plurality of delta information are continuously smaller than a predetermined value for a predetermined duration of time,

wherein the relay station (RS) acquires control information by analyzing the at least one of the channel quality information and the plurality of delta information if the values of the plurality delta information are not continuously smaller than the predetermined value for the predetermined duration of time, and

wherein the mobile station (MS) communicates directly with the base station (BS) without passing data through the relay station (RS) if the values of the plurality of delta information are continuously smaller than the predetermined value for the predetermined duration of time.

7. The feedback control method according to claim 6, further comprising:

receiving data, in which the at least one of the channel quality information and delta information of the channel quality information is reflected, from the relay station (RS).

8. The feedback control method according to claim 6, further comprising:

receiving the acquired control information, in which the at least one of the channel quality information and the plurality of delta information of the channel quality information is reflected, from the relay station (RS).

9. The feedback control method according to claim 8, further comprising:

transmitting the at least one of the channel quality information and the plurality of delta information of the channel quality information to a base station (BS) according to the received control information.

10. The feedback control method according to claim 8, further comprising:

transmitting the at least one of the channel quality information and the plurality of delta information of the channel quality information according to the control information received from the relay station (RS); and

receiving associated control information or data via another relay station newly connected to the wireless communication system.

11. A mobile station (MS) configured to perform a feedback control method for channel quality information for supporting a wireless communication system including a relay station (RS), the mobile station (MS) comprising:

a transceiver configured to

transmit total channel quality information to the relay station (RS) via a first uplink channel resource area,

when an optimized channel quality indicator (CQI) report indicator associated with the total channel quality information is set to 1, transmit a plurality of delta information of the channel quality information to the relay station (RS) via a second uplink channel resource area,

wherein at least one of the channel quality information and the plurality of delta information are transmitted, by the relay station (RS), to a base station (BS) if values of the plurality of delta information are continuously smaller than a predetermined value for a predetermined duration of time,

wherein at least one of the channel quality information and the plurality of delta information are analyzed by the relay station (RS) for acquiring control information if the values of the plurality delta information are not continuously smaller than the predetermined value for the predetermined duration of time, and

communicate directly with the base station (BS) without passing data through the relay station (RS) if values of the plurality of delta information are continuously smaller than the predetermined value for the predetermined duration of time.