Method and apparatus for selecting service path in relay communication system

• US 7,848,774 B2
• Filed: 08/30/2007
• Issued: 12/07/2010
• Est. Priority Date: 08/30/2006
• Status: Expired due to Fees

• Current Assignee: Samsung Electronics Co. Ltd.
• Original Assignee: Samsung Electronics Co. Ltd.
• Inventors: Park, Won-Hyoung
• Primary Examiner(s): Le; Danh C
• Application Number:
  US11/848,068
• Publication Number:
  US 20080057973A1
• Time in Patent Office: 1,195 Days
• Field of Search: 455/550.1, 455/11.1, 455/67.13, 370/315
• US Class Current: 455/550.1
• CPC Class Codes: H04L 45/125 based on throughput or bandwidth
• CPC Class Codes: H04W 16/26 Cell enhancers or enhancement, e.g. for tunnels, building shadow
• CPC Class Codes: H04W 40/02 Communication route or path selection, e.g. power-based or shortest path routing
• CPC Class Codes: H04W 40/16 based on interference
• CPC Class Codes: H04W 76/20 Manipulation of established connections

Abstract

A method and apparatus for selecting a service path of a Mobile Station (MS) in a relay communication system. The method includes periodically transmitting, by a Base Station (BS), a preamble (or pilot) signal to the MS and Relay Stations (RSs) existing within a cell; measuring, by the RSs, a Signal-to-Interference and Noise Ratio (SINR) of a BS-RS link, and transmitting the measured SINR and the preamble (or pilot) signal to the MS; by the MS, measuring an SINR of each link using signals received from the BS and the RSs; and by the MS, computing throughput in consideration of the SINR of each link and frequency resources reused in the RSs existing within the cell, and selecting a service path having the highest throughput.

Claims

1. A method of operating a Mobile Station (MS) for selecting a service path in a relay communication system, the method comprising:

measuring a Signal-to-Interference and Noise Ratio (SINR) of each link by using preamble (or pilot) signals from a Base Station (BS) and Relay Stations (RSs);

computing throughput for a case when a service is received from the BS by using the measured SINR of each link;

computing throughput for a case when the service is received via each RS in consideration of the measured SINR of each link and frequency resources reused in the RSs existing within a cell; and

selecting a service path having a highest throughput by comparing the computed throughputs of the respective service paths.

2. The method of claim 1, further comprising reporting to the BS or RS that the BS or RS has been selected as the service path of the MS.

3. The method of claim 1, wherein the step of measuring the SINR of each link comprises:

measuring an SINR of a BS-MS link by using a first preamble (or pilot) signal received from the BS;

measuring an SINR of an RS-MS link by using a second preamble (or pilot) signal received from each RS; and

receiving an SINR of a BS-RS link from each RS.

4. The method of claim 1, wherein, when the service is provided from the BS, the throughput, SEP_thr, where SEP is Spectral Efficiency Path, can be expressed as:

SEP_dir=C(SINR_BM),

where C denotes an SINR function for channel throughput, and SINR_BM denotes an SINR value of a BS-MS link.

5. The method of claim 1, wherein, when the service is provided via an RS in consideration of the frequency reuse, the throughput, CSEP_re, where CSEP is Cell Spectral Efficiency Path, of the service path is expressed as:

6. The method of claim 5, wherein a same frequency resource is repeatedly used up to N/FRF times in a same frame according to the FRF.

7. The method of claim 1, wherein, when the service is provided via the RS in consideration of frequency reuse, the throughput, CSEP_re, where CSEP is Cell Spectral Efficiency Path, of the service path is expressed as:

8. The method of claim 1, wherein the BS and the RS each transmit a signal in a different frame.

9. A Mobile Station (MS) apparatus for selecting a service path in a relay communication system, the MS apparatus comprising:

a transceiver for transmitting/receiving signals to/from a Base Station (BS) and Relay Stations (RSs);

a channel information checking unit for measuring a Signal-to-Interference and Noise Ratio (SINR) of each link by using the signals received from the BS and the RSs;

a throughput measuring unit for computing throughput for a case when a service is received from the BS by using the measured SINR of each link and throughput for a case when the service is received via each RS in consideration of frequency reuse within a cell; and

a path selector for selecting a service path having a highest throughput by comparing the computed throughputs of the service paths.

10. The apparatus of claim 9, wherein the SINR of each link includes an SINR of a BS-RS link, an SINR of a BS-MS link, and an SINR of an RS-MS link.

11. The apparatus of claim 9, wherein, when the service is provided from the BS, the throughput, SEP_dir, where SEP is Spectral Efficiency Path, can be expressed as:

SEP_dir=C(SINR_BM),

where C denotes an SINR function for channel throughput, and SINR_BM denotes an SINR value of a BS-MS link.

12. The apparatus of claim 9, wherein, when the service is provided via an RS in consideration of the frequency reuse, the throughput, CSEP_re, where CSEP is Cell Spectral Efficiency Path, of the service path is expressed as:

13. The apparatus of claim 12, wherein a same frequency resource is repeatedly used up to N/FRF times in a same frame according to the FRF.

14. The apparatus of claim 9, wherein the transceiver reports to the BS or RS that the BS or RS has been selected as the service path of the MS.

15. The apparatus of claim 9, wherein, when the service is provided via the RS in consideration of frequency reuse, the throughput, CSEPre, where CSEP is Cell Spectral Efficiency Path, of the service path is expressed as:

16. The apparatus of claim 9, wherein the BS and the RS each transmit a signal in a different frame.