Short-term interference mitigation in a wireless communication system

• US 8,825,046 B2
• Filed: 10/30/2008
• Issued: 09/02/2014
• Est. Priority Date: 02/01/2008
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Borran, Mohammad J., Khandekar, Aamod, Bhushan, Naga, Sampath, Ashwin, Gorokhov, Alexei, Agrawal, Avneesh, Palanki, Ravi, Horn, Gavin B.
• Primary Examiner(s): Hu, Jinsong
• Assistant Examiner(s): Nealon, William
• Application Number:
  US12/261,998
• Publication Number:
  US 20090197590A1
• Time in Patent Office: 2,133 Days
• Field of Search: None
• US Class Current: 455/434
• CPC Class Codes: H04W 52/242 taking into account path loss
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/28 using user profile, e.g. mobile speed, priority or network state, e.g. standby, idle or non transmission
• CPC Class Codes: H04W 52/325 Power control of control or pilot channels
• CPC Class Codes: H04W 52/34 TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
• CPC Class Codes: H04W 72/51 based on terminal or device properties

Abstract

Techniques for transmitting data with short-term interference mitigation in a wireless communication system are described. In one design, a serving base station may send a message to a terminal to trigger short-term interference mitigation. In response, the terminal may send a message to request at least one interfering base station to reduce interference on at least one resource. Each interfering base station may determine a transmit power level to be used for the at least one resource and may send a pilot at this transmit power level. The terminal may estimate the channel quality of the at least one resource based on at least one pilot received from the at least one interfering base station. The terminal may send information indicative of the estimated channel quality to the serving base station. The serving base station may send a data transmission on the at least one resource to the terminal.

Claims

1. A method for wireless communication, comprising:

determining at least one specific resource on which to reduce interference from among a plurality of resources available for use;

sending a message to trigger a first terminal to request at least one interfering base station to reduce interference on the at least one specific resource;

sending a first data transmission on the at least one specific resource to the first terminal; and

sending a second data transmission on at least one other resource to a second terminal, without requesting interference reduction from the at least one interfering base station on the at least one other resource.

2. The method of claim 1, further comprising:

receiving at least one pilot measurement report from the first terminal; and

determining whether to perform interference mitigation for the first terminal based on the at least one pilot measurement report.

3. The method of claim 1, further comprising:

determining interference observed by the first terminal based on at least one pilot measurement report received from the first terminal; and

determining whether to send the message to the first terminal based on the interference observed by the first terminal.

4. The method of claim 1, further comprising:

receiving information indicative of channel quality of the at least one specific resource from the first terminal;

determining a modulation and coding scheme based on the channel quality of the at least one specific resource; and

processing data for the first terminal in accordance with the modulation and coding scheme.

5. The method of claim 1, wherein the message comprises information identifying the at least one specific resource, or an indication of a priority of the request, or both.

6. The method of claim 1, wherein the message and the first data transmission are sent in different frames of a single hybrid automatic retransmission (HARQ) interlace.

7. An apparatus for wireless communication, comprising:

at least one processor configured to determine at least one specific resource on which to reduce interference from among a plurality of resources available for use, to send a message to trigger a first terminal to request at least one interfering base station to reduce interference on the at least one specific resource, to send a first data transmission on the at least one specific resource to the first terminal, and to send a second data transmission on at least one other resource to a second terminal, without requesting interference reduction from the at least one interfering base station on the at least one other resource.

8. The apparatus of claim 7, wherein the at least one processor is configured to receive at least one pilot measurement report from the first terminal, and to determine whether to perform interference mitigation for the first terminal based on the at least one pilot measurement report.

9. The apparatus of claim 7, wherein the at least one processor is configured to determine interference observed by the first terminal based on at least one pilot measurement report received from the first terminal, and to determine whether to send the message to the first terminal based on the interference observed by the first terminal.

10. The apparatus of claim 7, wherein the at least one processor is configured to receive information indicative of channel quality of the at least one specific resource from the first terminal, to determine a modulation and coding scheme based on the channel quality of the at least one specific resource, and to process data for the first terminal in accordance with the modulation and coding scheme.

11. An apparatus for wireless communication, comprising:

means for determining at least one specific resource on which to reduce interference from among a plurality of resources available for use;

means for sending a message to trigger a first terminal to request at least one interfering base station to reduce interference on the at least one specific resource;

means for sending a first data transmission on the at least one specific resource to the first terminal; and

means for sending a second data transmission on at least one other resource to a second terminal, without requesting interference reduction from the at least one interfering base station on the at least one other resource.

12. The apparatus of claim 11, further comprising:

means for receiving at least one pilot measurement report from the first terminal; and

means for determining whether to perform interference mitigation for the first terminal based on the at least one pilot measurement report.

13. The apparatus of claim 11, further comprising:

means for determining interference observed by the first terminal based on at least one pilot measurement report received from the first terminal; and

means for determining whether to send the message to the first terminal based on the interference observed by the first terminal.

14. The apparatus of claim 11, further comprising:

means for receiving information indicative of channel quality of the at least one specific resource from the first terminal;

means for determining a modulation and coding scheme based on the channel quality of the at least one specific resource; and

means for processing data for the first terminal in accordance with the modulation and coding scheme.

15. A non-transitory processor-readable medium comprising:

code for causing at least one processor to determine at least one specific resource on which to reduce interference from among a plurality of resources available for use;

code for causing the at least one processor to send a message to trigger a first terminal to request at least one interfering base station to reduce interference on the at least one specific resource,

code for causing the at least one processor to send a first data transmission on the at least one specific resource to the first terminal; and

code for causing the at least one processor to send a second data transmission on at least one other resource to a second terminal, without requesting interference reduction from the at least one interfering base station on the at least one other resource.

16. A method for wireless communication, comprising:

receiving from a serving base station a first message triggering interference mitigation;

determining at least one specific resource on which to reduce interference from among a plurality of resources available for use; and

sending a second message to request at least one interfering base station to reduce interference on the at least one specific resource.

17. The method of claim 16, further comprising:

receiving a first data transmission on the at least one specific resource from the serving base station at a first terminal, wherein the serving base station sends a second data transmission on at least one other resource to a second terminal without requesting interference reduction from the at least one interfering base station on the at least one other resource.

18. The method of claim 16, further comprising:

sending to the serving base station at least one pilot measurement report for the at least one interfering base station.

19. The method of claim 16, further comprising:

estimating channel quality of the at least one specific resource; and

sending information indicative of the estimated channel quality of the at least one specific resource to the serving base station.

24. The method of claim 16, wherein the sending the second message comprises sending the second message on a control channel to request the at least one interfering base station to reduce interference on the at least one specific resource.

25. The method of claim 24, wherein the control channel is sent on designated resources for the control channel.

20. An apparatus for wireless communication, comprising:

at least one processor configured to receive from a serving base station a first message triggering interference mitigation, to determine at least one specific resource on which to reduce interference from among a plurality of resources available for use, and to send a second message to request at least one interfering base station to reduce interference on the at least one specific resource.

21. The apparatus of claim 20, wherein the at least one processor is configured to receive a first data transmission on the at least one specific resource from the serving base station at a first terminal, and wherein the serving base station sends a second data transmission on at least one other resource to a second terminal without requesting interference reduction from the at least one interfering base station on the at least one other resource.

22. The apparatus of claim 20, wherein the at least one processor is configured to send to the serving base station at least one pilot measurement report for the at least one interfering base station.

23. The apparatus of claim 20, wherein the at least one processor is configured to estimate channel quality of the at least one specific resource and to send information indicative of the estimated channel quality of the at least one specific resource to the serving base station.

26. An apparatus for wireless communication comprising:

means for receiving from a serving base station a first message triggering interference mitigation;

means for determining at least one specific resource on which to reduce interference from among a plurality of resources available for use; and

means for sending a second message to request at least one interfering base station to reduce interference on the at least one specific resource.

27. The apparatus of claim 26, further comprising:

means for receiving a first data transmission on the at least one specific resource from the serving base station at a first terminal, wherein the serving base station sends a second data transmission on at least one other resource to a second terminal without requesting interference reduction from the at least one interfering base station on the at least one other resource.

28. The apparatus of claim 26, further comprising:

means for sending to the serving base station at least one pilot measurement report for the at least one interfering base station.

29. The apparatus of claim 26, further comprising:

means for estimating channel quality of the at least one specific resource; and

means for sending information indicative of the estimated channel quality of the at least one specific resource to the serving base station.

30. A non-transitory processor-readable medium comprising:

code for causing at least one processor to receive from a serving base station a first message triggering interference mitigation;

code for causing the at least one processor to determine at least one specific resource on which to reduce interference from among a plurality of resources available for use; and

code for causing the at least one processor to send a second message to request at least one interfering base station to reduce interference on the at least one specific resource.