Power control utilizing multiple rate interference indications

• US 8,700,082 B2
• Filed: 01/04/2007
• Issued: 04/15/2014
• Est. Priority Date: 01/05/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Borran, Mohammad J., Khandekar, Aamod, Agrawal, Avneesh, Ji, Tingfang
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US11/620,030
• Publication Number:
  US 20090149140A1
• Time in Patent Office: 2,658 Days
• Field of Search: 455/522, 370/318
• US Class Current: 455/522
• CPC Class Codes: H04W 52/241 taking into account channel quality metrics, e.g. SIR, SNR, CIR, Eb/lo
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/247 where the output power of a terminal is based on a path parameter sent by another terminal
• CPC Class Codes: H04W 52/60 using different transmission rates for TPC commands
• CPC Class Codes: Y02D 30/70 in wireless communication networks

Abstract

Systems and methodologies are described that facilitate mitigation of interference in a wireless communication environment. Terminals can utilize interference information provided by neighboring sectors to adjust transmit power and reduce interference. Access points can provide two sets or types of interference information. The first type can be transmitted over a large coverage area, requiring significant overhead and limiting the transmission rate. Access points can also provide a second set or type of interference information directed at smaller coverage area, such as an area proximate to the edge of the supported sector. This second type of interference information can be utilized by terminals that include the access point within their active set. The second set of interference information can be provided at a higher rate than the first set due to decreased overhead requirements. Terminals can utilize both sets of interference information to adjust transmit power.

Claims

1. A method for controlling interference, comprising:

transmitting a first interference communication from an access point to a terminal in a neighboring sector; and

transmitting a second interference communication from the access point to the terminal, wherein the second interference communication is transmitted at a higher periodic rate than the first interference communication.

2. The method of claim 1, the first and second interference communications are based at least in part upon interference data for a sector and transmit power for at least one terminal in a neighboring sector is adjusted as a function of the first interference communication and the second interference communication.

3. The method of claim 1, further comprising:

generating the first interference communication and the second interference communication as a function of interference data for a sector; and

comparing the interference data to a threshold, transmission of the first interference communication and the second interference communication is controlled based upon the comparison.

4. The method of claim 1, further comprising:

generating the first interference communication as a function of a first analysis of interference data; and

generating the second interference communication as a function of a second analysis of the interference level, the first analysis and the second analysis are distinct.

5. The method of claim 4, the first interference communication is a function of long term interference level.

6. The method of claim 4, the second interference communication is a function of short term of interference level.

7. The method of claim 4, the first analysis utilizes a first threshold to control transmission of the first interference communication and the second analysis utilizes a second threshold to control transmission of the second interference communication, the first threshold and the second threshold are distinct.

8. The method of claim 1, the first interference communication transmitted via a designated channel and the second interference communication transmitted via a resource assignment channel.

49. The method of claim 1, wherein the second interference communication is transmitted at a lower power than the first interference communication.

9. A method of controlling terminal transmit power in a wireless environment, comprising:

receiving a first interference communication from a neighboring sector;

receiving a second interference communication from the neighboring sector, the second interference communication is transmitted at higher periodic rate and lower power than the first interference communication; and

regulating transmit power for a terminal supported by a sector based at least in part upon the first interference communication and/or the second interference communication.

10. The method of claim 9, the second interference communication is received in a resource assignment channel and the neighboring sector is within a set of active sectors of the terminal.

11. The method of claim 9, further comprising:

performing a first analysis of the first interference communication; and

performing a second analysis of the second interference communication, regulation of the transmit power is a function of the first analysis and/or the second analysis, the first analysis and the second analysis are distinct.

12. The method of claim 11, the first analysis utilizes a first set of parameters and the second analysis utilizes a second set of parameters.

13. The method of claim 11, the second analysis performed on the second interference communication includes evaluating channel strength.

14. An apparatus that facilitates controlling interference, comprising:

a processor that executes instructions for transmitting first interference communication on a first channel and second interference communication using a second channel, wherein the first interference communication and second interference communication are transmitted from an access point in a neighboring sector, and further wherein the second channel has a higher periodic rate than the first channel; and

a memory that stores interference data for a sector, the first interference communication and second interference communication are based at least in part upon the interference data.

15. The apparatus of claim 14, transmit power level for a terminal supported by a neighboring sector is modified as a function of the first interference communication and the second interference communication.

16. The apparatus of claim 14, the processor further executes instructions for:

determining the first interference communication as a function of a first evaluation procedure for the interference data; and

determining the second interference communication as a function of a second evaluation procedure for the interference data, the first evaluation procedure and the second evaluation procedure are independent.

17. The apparatus of claim 16, the first evaluation procedure utilizes a first limit to manage transmission of the first interference communication and the second evaluation procedure utilizes a second limit to manage transmission of the second interference, communication, the first limit and the second limit are independent.

18. The apparatus of claim 14, the processor further executes instructions for:

determining, the first interference communication as a function of long-term interference level; and

determining the second interference communication as a function of short-term interference level.

19. The apparatus of claim 14, the first channel is designated for transmission of interference information and the second channel is a resource assignment channel.

20. An apparatus that facilitates controlling interference, comprising:

a memory that stores information associated with transmit power of a terminal; and

a processor that executes instructions for determining the transmit power based upon a first interference communication and a second interference communication, from a non-serving sector, the second interference communication is transmitted at a higher periodic rate than the first interference communication.

21. The apparatus of claim 20, the non-serving sector is within an active set of the terminal.

22. The apparatus of claim 20, the processor further executes instructions for:

analyzing the first interference communication utilizing a first evaluation procedure; and

analyzing the second interference communication utilizing a second evaluation procedure, the first evaluation procedure and the second evaluation procedure are separate.

23. The apparatus of claim 20, the memory stores a first, set of parameters and a second set of parameters, the first evaluation procedure utilizes the first set of parameters and the second evaluation procedure utilizes the second set of parameters.

24. The apparatus of claim 20, the second evaluation procedure is based at least in part upon channel strength of the second interference communication.

25. An apparatus that facilitates control of interference, comprising:

means for generating a first interference output;

means for generating a second interference output;

means for transmitting, from a neighboring sector, the first interference output on a first channel; and

means for transmitting, from the neighboring sector, the second interference output on a second channel, the second channel is at a higher periodic rate than the first channel, the first interference output and the second interference output are used to manage transmit power for a terminal in the neighboring sector.

26. The apparatus of claim 25, further comprising means for utilizing a first computation in generation of the first interference output and a second computation in generation of the second interference output, the first computation and the second computation are distinct.

27. The apparatus of claim 25, further comprising:

means for comparing the first interference output to a threshold, transmission of the first interference output is a function of the comparison; and

means for comparing the second interference output to a threshold, transmission of the second interference output is a function of the comparison.

28. The apparatus of claim 25, the first interference output is a function of long-term interference level and the second interference output is a function of short-term interference level.

29. An apparatus that facilitates mitigating interference, comprising:

means for obtaining a first interference output and a second interference output from a non-serving sector, wherein the second interference output is obtained at a higher periodic rate than the first interference output; and

means for managing transmit power of a terminal as a function of the first interference output and/or the second interference output.

30. The apparatus of claim 29, the non-serving sector is within a set of active sectors of the terminal.

31. The apparatus of claim 29, further comprising:

means for performing a first analysis of the first interference output; and

means for performing a second analysis of the second interference output, the first analysis and the second analysis are distinct.

32. A non-transitory computer-readable medium having instructions for;

transmitting first other sector interference output from a neighboring sector to a terminal; and

transmitting second other sector interference output from the neighboring sector to the terminal, the first other sector interference output is transmitted at a lower periodic rate than the second other sector interference output and transmit power level is regulated based upon the first other sector interference output and the second other sector interference output.

33. The non-transitory computer-readable medium of claim 32, the instructions further comprising:

generating the first other sector interference, output as a function of a first evaluation of amount of interference observed by a sector; and

generating the second other sector interference output as a function of a second evaluation of the amount of interference observed by the sector, the first evaluation is independent of the second evaluation.

34. The non-transitory computer-readable medium of claim 33, the first evaluation includes comparison of the amount of interference to a first threshold, the second evaluation includes comparison of the amount of interference to a second threshold, the first threshold is independent of the second threshold.

35. The non-transitory computer-readable medium of claim 32, the/first other sector interference output and the second other sector interference output are functions of interference level.

36. The non-transitory computer-readable medium of claim 32, the second other sector interference output is a segment within a resource assignment channel.

37. A non-transitory computer-readable medium having instructions for:

obtaining a first other sector interference output from a non-serving sector;

obtaining a second other sector interference output from the non-serving sector; and

managing transmit power for a terminal based at least in part upon the first other sector interference output and the second other sector interference, the second other sector interference output is obtained at a higher periodic rate than the first other sector interference output.

38. The non-transitory computer-readable medium of claim 37, the instructions further comprising:

adjusting the transmit power based at least in part upon a first analysis of the first other sector interference output; and

adjusting the transmit power based at least in part upon a second analysis of the second other sector interference output.

39. The non-transitory computer-readable medium of claim 38, the first analysis is distinct from the second analysis.

40. The non-transitory computer-readable medium of claim 38, the second analysis evaluates the channel strength of the second other sector interference output.

41. A processor that executes computer-executable instructions that facilitate mitigation of interference, the instructions comprising:

transmitting, from a neighboring sector, a first interference communication based at least in part upon amount of interference observed by a sector; and

transmitting, from the neighboring sector, a second interference communication based at least in part upon the amount of interference, the first interference communication is transmitted on a first channel and the second interference, communication is transmitted on a second channel, the second channel has a higher periodic transmission rate than the first channel, transmit power of a terminal supported by a neighboring sector is controlled based at least in part upon the first interference communication and the second interference communication.

42. The processor of claim 41, the instructions further comprising:

generating the first interference communication as a function of a first evaluation procedure; and

generating the second interference communication as a function of a second evaluation procedure.

43. The processor of claim 42, the first evaluation procedure is independent of the second evaluation procedure.

44. The processor of claim 42, the first channel is designated for transmission of other sector interference and the second channel is a resource assignment channel.

45. A processor that executes computer-executable instructions mat facilitate mitigation of interference, the instructions comprising:

receiving a first interference communication based at least in part upon amount of interference observed by a neighboring sector;

receiving a second interference communication based at least in part upon the amount of interference, wherein the second interference communication is received at a higher periodic rate than the first interference communication; and

performing a first adjustment of the transmission power of a terminal supported by a sector as a function of the first interference communication; and

performing a second adjustment the transmission power of the terminal as a function of the second interference communication.

46. The processor of claim 45, the first adjustment is distinct from the second adjustment.

47. The processor of claim 45, the second interference communication is received from the access point within the active set of the terminal.

48. The process of claim 45, the second adjustment includes an evaluation of the channel strength of the second interference communication.