POWER CONTROL AND CHANNEL REUSE TECHNIQUES FOR WIRELESS RELAY NETWORKS

• US 20080214182A1
• Filed: 01/03/2008
• Published: 09/04/2008
• Est. Priority Date: 01/08/2007
• Status: Active Grant

• Current Assignee: Nokia Technologies Oy (Nokia Corporation)
• Original Assignee: Nokia Corporation
• Inventors: Wang, Shu-Shaw, Reid, Tony, Green, Marilynn
• Granted Patent: US 8,270,908 B2
• Time in Patent Office: Days
• US Class Current: 455/423
• 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 52/46 in multi hop networks, e.g. wireless relay networks
• CPC Class Codes: H04W 72/54 based on quality criteria
• CPC Class Codes: H04W 84/047 using dedicated repeater stations

Abstract

Various example embodiments are disclosed relating to relay networks or multi-hop networks, and also relating to power control and channel reuse techniques for wireless relay networks. A technique of power control in a wireless relay network may include receiving a channel measurement report via a relay station from a mobile station attached to the relay station, and determining a mobile station-specific downlink data transmission power level for the relay station to transmit data to the mobile station based at least in part on the received channel measurement report from the mobile station.

Claims

1. A method comprising:

receiving a neighbor measurement report from one or more relay stations in a wireless network, the neighbor measurement report indicating channel quality for signals received at the reporting relay station from one or more neighbor wireless nodes; and

determining a maximum transmission power level for each of the one or more relay stations based on the received neighbor measurement reports.

2. The method of claim 1, further comprising sending a message to each of the one or more relay stations indicating the determined maximum transmission power level for the relay station.

3. The method of claim 1, further comprising sending a RS_EIRP-REQ message to each of the one or more relay stations indicating the determined maximum transmission power level for the relay station.

4. The method of claim 1:

wherein the receiving comprises receiving the neighbor measurement report from a first relay station in the wireless relay network indicating the channel quality for signals received at the first relay station from a second relay station; and

wherein the determining comprises determining the maximum transmission power level for the second relay station based on the neighbor measurement report from the first relay station.

5. The method of claim 1, wherein the neighbor measurement report identifies at least a received signal strength indication, a subcarrier or segment, and a neighbor node identification for each of the one or more neighbor nodes for which channel quality is being reported by the reporting relay station.

6. The method of claim 1, further comprising setting a downlink preamble and control signal power transmission level for the relay station to the determined maximum transmission power level for the relay station.

7. An apparatus for wireless communications, the apparatus comprising:

a controller;

a memory coupled to the controller; and

a wireless transceiver coupled to the controller;

the apparatus adapted to;

receive a neighbor measurement report from one or more relay stations in a wireless network, the neighbor measurement report indicating channel quality for signals received at the reporting relay station from one or more neighbor wireless nodes; and

determine a maximum transmission power level for each of the one or more relay stations based on the received neighbor measurement reports.

8. A method of power control in a wireless relay network, the method comprising:

receiving a channel measurement report via a relay station from a mobile station attached to the relay station, the channel measurement report indicating a channel quality for signals received at the mobile station from the relay station; and

determining a mobile station-specific downlink data transmission power level for the relay station to transmit data to the mobile station, the determining being performed based at least in part on the received channel measurement report from the mobile station.

9. The method of claim 8 wherein the receiving comprises receiving the channel measurement report via the relay station from one or more mobile stations attached to the relay station, each channel measurement report indicating a carrier-to-interference-and-noise-ratio (CINR) for signals received at the reporting mobile station from the relay station.

10. The method of claim 8 wherein the determining comprises determining the mobile station-specific downlink data transmission power level for the relay station to transmit data to the mobile station, the determining being performed based at least in part on the received channel measurement report from the mobile station, the mobile station-specific downlink data transmission power level being represented as a boosting value indicating an increase or decrease in transmission power relative to a non-boosted transmission power level.

11. The method of claim 8, further comprising sending a message to the relay station indicating the mobile station-specific determined downlink data transmission power level to be used by the relay station to transmit data to the mobile station.

12. The method of claim 8, further comprising sending a DL-Map message to the relay station indicating the determined mobile station-specific downlink data transmission power level to be used by the relay station for the mobile station, the mobile station-specific downlink data transmission power level being represented in the DL-Map message as a boosting value indicating an increase or decrease in transmission power relative to a non-boosted transmission power level.

13. The method of claim 8, further comprising the relay station transmitting data to the mobile station at the determined mobile station-specific downlink data transmission power level for at least one data burst.

14. The method of claim 8 wherein the determining comprises:

decreasing the mobile station-specific downlink data transmission power level for the mobile station if the channel quality indicated in the channel measurement report from the mobile station is greater than a threshold value.

15. The method of claim 8 wherein the determining comprises:

increasing the mobile station-specific downlink data transmission power level for the mobile station if the channel quality indicated in the channel measurement report from the mobile station is less than a threshold value.

16. The method of claim 8 wherein the determining comprises:

decreasing the mobile station-specific downlink data transmission power level for the mobile station if the channel quality indicated in the channel measurement report from the mobile station is greater than a first threshold value; and

increasing the mobile station-specific downlink data transmission power level for the mobile station if the channel quality indicated in the channel measurement report from the mobile station is less than a second threshold value.

17. The method of claim 8, further comprising:

adjusting a modulation scheme and/or coding scheme used by the relay station for downlink data transmission to the mobile station if the channel quality indicated in the channel measurement report from the mobile station is greater than a threshold value.

18. An apparatus for wireless communications, the apparatus comprising:

a controller;

the apparatus adapted to;

receive a channel measurement report via a relay station from a mobile station attached to the relay station, the channel measurement report indicating a channel quality for signals received at the mobile station from the relay station; and

determine a mobile station-specific downlink data transmission power level for the relay station to transmit data to the mobile station, the determining being performed based at least in part on the received channel measurement report from the mobile station.

19. A method of power control in a wireless relay network, the method comprising:

receiving a first channel measurement report via a first relay station from a first mobile station attached to the first relay station and a second channel measurement report via a second relay station from a second mobile station attached to the second relay station, the first channel measurement report indicating a channel quality for signals received at the first mobile station from the first relay station and the second channel measurement report indicating a channel quality for signals received at the second mobile station from the second relay station; and

assigning the first mobile station and the second mobile station to a same channel for downlink data transmission from the first and second relay stations, respectively, if the channel quality in the first measurement report and the channel quality in the second measurement report are greater than a threshold.

20. The method of claim 19 wherein the channel quality comprises a carrier-to-interference-and-noise-ratio.