METHOD AND APPARTUS FOR ADJUSTMENTS FOR DELTA-BASED POWER CONTROL IN WIRELESS COMMUNICATION SYSTEMS

• US 20080161033A1
• Filed: 08/31/2007
• Published: 07/03/2008
• Est. Priority Date: 09/08/2006
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gorokhov, Alexei, Bhushan, Naga, Zhang, Xin, Khandekar, Aamod, Ji, Tingfang, Borran, Mohammad Jaber, Kannan, Arumugam Chendamarai
• Granted Patent: US 8,442,572 B2
• Time in Patent Office: Days
• US Class Current: 455/522
• CPC Class Codes: H04W 24/02 Arrangements for optimising operational condition
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/243 taking into account interferences
• CPC Class Codes: H04W 52/44 in connection with interruption of transmission

Abstract

Systems and methodologies are described that provide techniques for performing adjustments for delta-based power control and interference management in a wireless communication system. A terminal can utilize one or more delta-based power control techniques described herein upon engaging in a reverse link transmission after a predetermined period of silence or after receiving indications of interference from neighboring access points. A delta value can be computed through open-loop projection, based on which transmission resources such as bandwidth and/or transmit power can be increased or decreased to manage interference caused by the terminal. A delta value, other feedback from the terminal, and/or indications of interference caused by the terminal can also be communicated as feedback to a serving access point to allow the access point to assign transmission resources for the terminal.

Claims

1. A method for power control in a wireless communication system, comprising:

determining whether a prior transmission occurred before a predetermined threshold;

computing one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value; and

adjusting one or more parameters to be used for a future transmission based at least in part on the computed values.

2. The method of claim 1, wherein the threshold is based on at least one parameter selected from the group consisting of a number of frames, a number of superframes, and a time period.

3. The method of claim 1, wherein the adjusting one or more parameters to be used for a future transmission includes adjusting a transmit power offset to be used for a future transmission.

4. The method of claim 1, wherein the adjusting one or more parameters to be used for a future transmission includes adjusting a bandwidth utilized for a future transmission.

5. The method of claim 1, wherein the adjusting one or more parameters to be used for a future transmission includes:

adjusting a power spectral density (PSD) as a function of a computed open loop delta value; and

adjusting a transmit power to be used for a future transmission based on the adjusted PSD.

6. The method of claim 1, wherein the adjusting one or more parameters to be used for a future transmission includes:

determining whether an other sector interference (OSI) indication corresponding to the prior transmission has been received; and

adjusting one or more parameters to be used for a future transmission based at least in part on whether an OSI indication has been received.

7. The method of claim 6, wherein the adjusting one or more parameters to be used for a future transmission further includes:

determining that an OSI indication corresponding to the prior transmission has been received;

selecting a lowest transmit power used within a predetermined period of time that caused an OSI indication; and

adjusting a transmit power to be used for a future transmission to the selected transmit power minus a delta value.

8. The method of claim 6, wherein the adjusting one or more parameters to be used for a future transmission further includes:

determining that an OSI indication corresponding to the prior transmission has not been received;

selecting a highest transmit power used within a predetermined period of time that did not cause an OSI indication; and

adjusting a transmit power to be used for a future transmission to the selected transmit power plus a delta value.

9. The method of claim 1, wherein the adjusting one or more parameters to be used for a future transmission includes:

receiving an assignment for one or more parameters to be used for the future transmission from an access point; and

adjusting the one or more parameters based on the assignment.

10. The method of claim 1, further comprising communicating one or more of the computed values and the adjusted parameters to an access point.

11. A wireless communications apparatus, comprising:

a memory that stores data relating to a time at which a prior transmission was conducted and a threshold; and

a processor configured to determine whether the prior transmission occurred earlier than the threshold and, upon a positive determination, to compute one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value and to adjust a parameter to be used for transmissions based on the computed values.

12. The wireless communications apparatus of claim 11, wherein the threshold is based on at least one of a number of frames, a number of superframes, and a time period.

13. The wireless communications apparatus of claim 11, wherein the processor is further configured to adjust a transmit power offset to be used for transmissions based on the computed values.

14. The wireless communications apparatus of claim 11, wherein the processor is further configured to adjust a bandwidth utilized for transmissions based on the computed values.

15. The wireless communications apparatus of claim 11, wherein the memory further stores data relating to an assignment for a parameter to be used for transmissions, and the processor is further configured to adjust the parameter based on the assignment.

16. The wireless communications apparatus of claim 15, wherein the processor is further configured to determine whether the assignment for a parameter to be used for transmissions matches a computed open loop value.

17. The wireless communications apparatus of claim 16, wherein the processor is further configured to suspend transmission or to compute a new open loop value if the assignment does not match the computed open loop value.

18. The wireless communications apparatus of claim 11, wherein the processor is further configured to communicate one or more of a computed open loop value and the adjusted parameter for transmissions to an access point.

19. An apparatus that facilitates reverse link power control in a wireless communication system, comprising:

means for conducting a transmission to a serving sector on a reverse link;

means for determining whether the transmission occurred outside of a timing threshold;

means for computing an open loop delta value, an open loop delta value, or a bandwidth based on a delta value upon a positive determination; and

means for means for adjusting a parameter utilized for conducting transmissions to the serving sector based on the computed value.

20. The apparatus of claim 19, wherein the means for adjusting includes means for adjusting one or more of a transmit power offset and a bandwidth utilized for conducting transmissions to the serving sector.

21. The apparatus of claim 19, wherein the means for adjusting includes:

means for adjusting a PSD based on the computed value; and

means for adjusting a transmit power utilized for conducting transmissions to the serving sector based on the adjusted PSD.

22. The apparatus of claim 19, wherein the means for adjusting includes:

means for receiving an assigned parameter from the serving sector; and

means for adjusting a parameter utilized for communications with the serving sector based on the assigned parameter.

23. The apparatus of claim 19, further comprising means for communicating one or more of the computed value and the adjusted parameters to the serving sector.

24. A computer-readable medium, comprising:

code for causing a computer to conduct a reverse link transmission to a base station after a predetermined timing threshold;

code for causing a computer to compute one or more open loop delta-based parameters; and

code for causing a computer to adjust one or more of a bandwidth and a transmit power used for future transmissions to the base station based at least in part on the computed open loop delta-based parameters.

25. The computer-readable medium of claim 24, wherein the code for causing a computer to compute includes code for causing a computer to compute one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on a delta value.

26. The computer-readable medium of claim 24, wherein the timing threshold corresponds to at least one parameter selected from the group consisting of a number of frames, a number of superframes, and a time period.

27. The computer-readable medium of claim 24, wherein the code for causing a computer to adjust includes:

code for causing a computer to determine whether an other sector interference (OSI) indication corresponding to the reverse link transmission has been received; and

code for causing a computer to adjust one or more of the bandwidth and the transmit power used for future transmissions to the base station based at least in part on the determination.

28. The computer-readable medium of claim 24, further comprising code for causing a computer to communicate at least one of the computed open loop delta-based parameters, an adjusted bandwidth, and an adjusted transmit power to the base station.

29. An integrated circuit that executes computer-executable instructions for reverse link power control and interference management in a wireless communication system, the instructions comprising:

conducting a reverse link transmission to a serving sector;

determining whether an OSI indication corresponding to the reverse link transmission has been received; and

adjusting one or more parameters to be used for future reverse link transmissions based at least in part on whether an OSI indication has been received.

30. The integrated circuit of claim 29, wherein the adjusting includes adjusting one or more of a transmit power and a bandwidth to be used for future reverse link transmissions.

31. The integrated circuit of claim 29, wherein the determining includes determining that an OSI indication corresponding to the prior transmission has been received, and the adjusting includes:

selecting a lowest transmit power used within a predetermined period of time that caused an OSI indication; and

adjusting a transmit power to be used for future reverse link transmissions to the selected transmit power minus a delta value.

32. The integrated circuit of claim 29, wherein the determining includes determining that an OSI indication corresponding to the prior transmission has not been received, and the adjusting includes:

selecting a highest transmit power used within a predetermined period of time that did not cause an OSI indication; and

adjusting a transmit power to be used for future reverse link transmissions to the selected transmit power plus a delta value.

33. A method for conducting reverse link power control in a wireless communication system, comprising:

receiving one or more of a communication request and power control feedback information from a terminal;

receiving a report of OSI activity caused by the terminal; and

assigning a parameter to be used for communication by the terminal based on the received information and the received report of OSI activity.

34. The method of claim 33, wherein the receiving a report of OSI activity includes receiving the report of OSI activity from the terminal.

35. The method of claim 33, wherein the receiving a report of OSI activity includes receiving the report of OSI activity from a neighboring sector.

36. The method of claim 33, wherein the receiving a report of OSI activity includes receiving a power metric that indicates OSI activity caused by the terminal.

37. The method of claim 33, wherein the assigning includes assigning one or more of a transmit power and a bandwidth to be used for communication by the terminal.

38. The method of claim 33, further comprising communicating the assigned parameter to the terminal.

39. A wireless communications apparatus, comprising:

a memory that stores data relating to a report of OSI activity caused by an access terminal and power control feedback information received from the access terminal; and

a processor configured to generate an assignment for transmission resources based on at least one of the report of OSI activity and the power control feedback and to communicate the assignment to the access terminal.

40. The wireless communications apparatus of claim 39, wherein the assignment for transmission resources includes an assignment for one or more of a transmit power and a bandwidth.

41. An apparatus that facilitates reverse link power control and interference management in a wireless communication system, comprising:

means for receiving power control information and OSI information corresponding to a wireless terminal;

means for assigning one or more of a transmit power and a bandwidth to the wireless terminal based at least in part on the received information; and

means for communicating an assigned transmit power or an assigned bandwidth to the wireless terminal.

42. A computer-readable medium, comprising:

code for causing a computer to receive a report of OS I activity caused by a terminal;

code for causing a computer to generate an assignment for one or more of a transmit power or a bandwidth to be utilized by the terminal based at least in part on the received report; and

code for causing a computer to communicate the assignment to the terminal.

43. The computer-readable medium of claim 42, wherein the code for causing a computer to receive includes code for causing a computer to receive the report of OSI activity from the terminal.

44. The computer-readable medium of claim 42, wherein the code for causing a computer to receive includes code for causing a computer to receive the report of OSI activity from a neighbor access point.

45. The computer-readable medium of claim 42, wherein the code for causing a computer to receive includes code for causing a computer to receive a power metric that indicates OSI activity caused by the terminal.

46. An integrated circuit that executes computer-executable instructions for reverse link power and interference control in a wireless communication system, the instructions comprising:

receiving feedback from a terminal, the feedback comprising a report of OSI indications received by the terminal;

assigning transmission resources to the terminal based on the received feedback; and

communicating the assigned transmission resources to the terminal.