Method and system for selecting a relay station in a communication system using a multihop relay scheme

• US 20070149118A1
• Filed: 12/27/2006
• Published: 06/28/2007
• Est. Priority Date: 12/27/2005
• Status: Active Grant

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Cho, Jae-Weon, Lee, Mi-Hyun, Lee, Sung-Jin, Son, Yeong-Moon, Hong, Song-Nam, Kang, Hyun-Jeong, Kim, Young-Ho, Son, Jung-Je, Lim, Hyoung-Kyu, Joo, Pen-Yuh
• Granted Patent: US 7,853,203 B2
• Time in Patent Office: Days
• US Class Current: 455/11.100
• CPC Class Codes: H04B 7/2606 Arrangements for base station coverage control, e.g. by using relays in tunnels
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 40/12 based on transmission quality or channel quality
• CPC Class Codes: H04W 40/22 using selective relaying for reaching a BTS [Base Transceiver Station] or an access point
• CPC Class Codes: H04W 48/16 Discovering, processing access restriction or access information

Abstract

A method and apparatus for selecting a Relay Station (RS) for a Mobile Station (MS) of a communication system are provided. The communication system is provided with the MS, a serving Base Station (BS) for providing the MS with a service and RSs for relaying signals of the MS and the BS. The MS receives RS information for increasing system capacity from the serving BS, measures reference signal strength of an RS indicated in the RS information, and selects an associated RS as a target RS for relaying a signal when the measured reference signal strength satisfies a condition.

Claims

1. A method for selecting a Relay Station (RS) by a Mobile Station (MS) of a communication system provided with the MS, a serving Base Station (BS) for providing the MS with a service and RSs for relaying signals of the MS and the BS, comprising the steps of:

receiving, from the serving BS, RS information for increasing system capacity;

measuring strength of a reference signal received from an RS indicated in the RS information; and

selecting an associated RS as a target RS for relaying a signal when the measured reference signal strength satisfies a condition.

2. The method of claim 1, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength value.

3. The method of claim 1, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than reference signal strength of the serving BS.

4. The method of claim 1, wherein the RS information includes at least one of information elements about a number of RSs for increasing the system capacity, an RS identifier, and a preamble index.

5. The method of claim 4, wherein the preamble index is identical to a preamble index used in the serving BS.

6. A signal transmission method for selecting a Relay Station (RS) of a Mobile Station (MS) in a serving Base Station (BS) cell area of a communication system provided with the MS, the serving BS for providing the MS with a service and RSs for relaying signals of the MS and the BS, comprising the steps of:

detecting a number of RSs for increasing system capacity; and

providing the MS with a message by generating the message including identifier information and preamble index information of each RS mapped to the detected number of RSs.

7. A method for selecting a Relay Station (RS) for a Mobile Station (MS) of a communication system provided with the MS, a serving Base Station (BS) for providing the MS with a service and RSs for relaying signals of the MS and the BS, comprising the steps of:

receiving a message including first RS information for increasing system capacity and second RS information for extending cell coverage;

extracting only the first RS information from the message when the MS selects a target RS for increasing the system capacity;

measuring reference signal strength of an RS indicated in the extracted first RS information; and

selecting an associated RS as the target RS for relaying a signal when the measured reference signal strength satisfies a condition.

8. The method of claim 7, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength value.

9. The method of claim 7, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than reference signal strength of the serving BS.

10. The method of claim 7, wherein the first RS information includes at least one of information elements about a number of RSs for increasing the system capacity, an RS identifier, and a preamble index.

11. A signal transmission method for selecting a Relay Station (RS) in a serving Base Station (BS) cell area of a communication system provided with a Mobile Station (MS), the serving BS for providing the MS with a service and RSs for relaying signals of the MS and the BS, comprising the steps of:

detecting a number of first RSs for increasing system capacity and a number of second RSs for extending cell coverage; and

providing the MS with a message by generating the message including first RS information having an identifier and a preamble index of each first RS mapped to the detected number of first RSs and second RS information having an identifier, a preamble index, an RS physical profile identifier, and a frequency index of each second RS mapped to the detected number of second RSs.

12. A communication system for selecting a Relay Station (RS), comprising:

a Mobile Station (MS); and

a serving Base Station (BS) for providing the MS with a service,

wherein the serving BS provides the MS with RS information for increasing system capacity, and

the MS receives the RS information, measures reference signal strength of an RS indicated in the RS information, and selects an associated RS as a target RS for relaying a signal when the measured reference signal strength satisfies a condition.

13. The communication system of claim 12, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength value.

14. The communication system of claim 12, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength of the serving BS.

15. The communication system of claim 12, wherein the RS information includes at least one of information elements about a number of RSs for increasing the system capacity, an RS identifier, and a preamble index.

16. The communication system of claim 15, wherein the preamble index is identical to a preamble index used in the serving BS.

17. A communication system for selecting a Relay Station (RS), comprising:

a Mobile Station (MS); and

a serving Base Station (BS) for providing the MS with a service,

wherein the serving BS provides the MS with a message including first RS information for increasing system capacity and second RS information for extending cell coverage, and

the MS receives the message, extracts only the first RS information from the message when selecting a target RS for increasing the system capacity, measures reference signal strength of an RS indicated in the extracted first RS information, and selects an associated RS as the target RS for relaying a signal when the measured reference signal strength satisfies a condition.

18. The communication system of claim 17, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength value.

19. The communication system of claim 17, wherein the condition is satisfied when the measured reference signal strength is equal to or greater than a reference signal strength of the serving BS.

20. The communication system of claim 17, wherein the first RS information includes at least one of information elements about a number of RSs for increasing the system capacity, an RS identifier, and a preamble index.