Interference mitigation in a wireless communication system

• US 20070207828A1
• Filed: 03/06/2006
• Published: 09/06/2007
• Est. Priority Date: 03/06/2006
• Status: Active Grant

• Current Assignee: WSOU Investments, LLC (WSOU Holdings, LLC)
• Original Assignee: Alcatel-Lucent SA (Nokia Corporation)
• Inventors: Li, Shupeng, Cheng, Fang-Chen, Song, Lei
• Granted Patent: US 8,150,412 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 16/04 Traffic adaptive resource partitioning
• CPC Class Codes: H04W 52/40 during macro-diversity or soft handoff

Abstract

The present invention provides a method of interference mitigation in a wireless communication system. The method that may include reducing transmission power associated with at least one first channel provided by at least one first base station associated with at least one corresponding first coverage area adjacent a second coverage area associated with a second base station concurrently with maintaining at least one transmission power associated with the second base station(s). The method may also include increasing the transmission power associated with the first channel(s) provided by the first base station(s) concurrently with reducing at least one transmission power associated with at least one first channel provided by the second base station(s).

Claims

1. A method of coordinating operation of a plurality of base stations, comprising:

reducing transmission power associated with at least one first channel provided by at least one first base station associated with at least one corresponding first coverage area adjacent a second coverage area associated with a second base station concurrently with maintaining at least one transmission power associated with said at least one second base station; and

increasing the transmission power associated with said at least one first channel provided by said at least one first base station substantially concurrently with reducing at least one transmission power associated with at least one first channel provided by said at least one second base station.

2. The method of claim 1, wherein reducing the transmission power associated with said at least one first channel provided by said at least one first base station comprises reducing the transmission power associated with at least one shared first channel provided by said at least one first base station.

3. The method of claim 2, wherein reducing the transmission power associated with said at least one shared first channel provided by said at least one first base station comprises reducing the transmission power associated with at least one shared high-speed downlink packet access channel provided by said at least one first base station.

4. The method of claim 1, wherein reducing the transmission power associated with said at least one first channel provided by said at least one first base station comprises reducing the transmission power associated with said at least one first channel concurrently with maintaining at least one transmission power associated with at least one second channel provided by said at least one first base station.

5. The method of claim 4, wherein maintaining said at least one transmission power of associated with said at least one second channel provided by said at least one first base station comprises maintaining at least one transmission power of at least one of a dedicated channel and a common control channel provided by said at least one first base station.

6. The method of claim 1, wherein reducing the transmission power associated with said at least one first channel provided by said at least one second base station comprises reducing the transmission power associated with at least one shared first channel provided by said at least one second base station.

7. The method of claim 6, wherein reducing the transmission power associated with said at least one shared first channel provided by said at least one second base station comprises reducing the transmission power associated with at least one shared high-speed downlink packet access channel provided by said at least one second base station.

8. The method of claim 1, wherein reducing the transmission power associated with said at least one first channel provided by said at least one second base station comprises reducing the transmission power associated with said at least one first channel concurrently with maintaining at least one transmission power associated with at least one second channel provided by said at least one second base station.

9. The method of claim 8, wherein maintaining said at least one transmission power of associated with said at least one second channel provided by said at least one second base station comprises maintaining at least one transmission power of at least one of a dedicated channel and a common control channel provided by said at least one second base station.

10. The method of claim 1, comprising scheduling at least one mobile unit to said at least one first channel provided by the first base station based on channel quality feedback received from said at least one mobile unit.

11. The method of claim 10, wherein scheduling said at least one mobile unit comprises determining a signal-to-interference ratio associated with said at least one the mobile unit based on the channel quality feedback.

12. The method of claim 11, wherein determining the signal-to-interference ratio comprises determining the signal-to-interference ratio based on the transmission power associated with said at least one first channel provided by the first base station.

13. The method of claim 11, wherein determining the signal-to-interference ratio comprises determining the signal-to-interference ratio based on channel quality indication feedback from a previous time interval.

14. The method of claim 11, wherein determining the signal-to-interference ratio comprises determining the signal-to-interference ratio based on acknowledgement feedback associated with a present time interval or a previous time interval provided by a hybrid automatic repeat request (HARQ) process.

15. The method of claim 11, wherein determining the signal-to-interference ratio comprises determining the signal-to-interference ratio based on an estimated Doppler frequency.

16. The method of claim 11, wherein determining the signal-to-interference ratio comprises determining the signal-to-interference ratio based on feedback of an estimated interference level.

17. The method of claim 1, wherein reducing the transmission power associated with said at least one first channel provided by the first base station comprises reducing the transmission power for a first time interval.

18. The method of claim 17, wherein increasing the transmission power of associated with said at least one first channel provided by the first base station comprises increasing the transmission power for a second time interval.

19. The method of claim 18, comprising determining the first and second time intervals based on a feedback delay.

20. The method of claim 19, wherein determining the first and second time intervals comprises determining the first and second time intervals based on a feedback delay associated with retransmission of at least one packet over said at least one first channel provided by the first base station.