Method and apparatus for adjustments for delta-based power control in wireless communication systems

• US 8,442,572 B2
• Filed: 08/31/2007
• Issued: 05/14/2013
• Est. Priority Date: 09/08/2006
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Borran, Mohammad Jaber, Khandekar, Aamod, Gorokhov, Alexei, Ji, Tingfang, Bhushan, Naga, Zhang, Xin, Kannan, Arumugam Chendamarai
• Primary Examiner(s): Safaipour, Bobbak
• Application Number:
  US11/848,865
• Publication Number:
  US 20080161033A1
• Time in Patent Office: 2,083 Days
• Field of Search: 455/522, 370/318
• 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 at a given time whether a preceding transmission occurred at a time preceding the given time by less than a predetermined timing threshold; and

if the determining indicates the preceding transmission did not occur at a time preceding the given time by less than the predetermined timing threshold, then,

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 predetermined timing threshold is based on at least one 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 the 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 OSI (other sector interference) indication corresponding to the preceding transmission has been received; and

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

7. The method of claim 6, wherein, if an OSI indication corresponding to the preceding transmission has been received, then the adjustment of one or more parameters to be used for the future transmission further includes:

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

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

8. The method of claim 6, wherein, if an OSI indication corresponding to the preceding transmission has not been received, then the adjustment of one or more parameters to be used for the future transmission further 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 a future transmission to the selected transmit power plus a delta value.

9. The method of claim 1, wherein the adjustment of 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.

16. The method of claim 1, wherein the computing is based at least in part on a maximum allowable inter-cell interference.

17. The method of claim 1, wherein the adjusting comprises:

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

selecting one of a lowest and a highest transmit power used within a predetermined period of time based on whether the OSI indication was received; and

adjusting a transmit power to be used for a future transmission based on the selected transmit power and a delta value.

23. The method of claim 1, further comprising receiving an OSI indicator from a neighboring cell.

11. 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 after a predetermined timing threshold after a preceding transmission to the serving sector;

means for computing, upon a positive determination that the transmission occurred after the predetermined timing threshold after the preceding transmission, at least one of an open loop delta value, an open loop delta value based on an assigned bandwidth, or a bandwidth based on a delta value; and

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

12. The apparatus of claim 11, 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.

13. The apparatus of claim 11, 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.

14. The apparatus of claim 11, 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.

15. The apparatus of claim 11, further comprising means for communicating one or more of the computed value and the adjusted parameters to the serving sector.

18. A mobile device comprising memory and a processor configured to perform a method comprising:

determining at a given time whether a preceding transmission occurred at a time preceding the given time by less than a predetermined timing threshold; and

if the determining indicates the preceding transmission did not occur at a time preceding the given time by less than the predetermined timing threshold, then,

computing one or more of an open loop delta value, and open loop delta value based on an assigned bandwidth, and a bandwidth based on an assigned delta value, wherein the computing is based at least in part on a maximum allowable inter-cell interference parameter; and

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

19. The mobile device of claim 18, wherein the predetermined timing threshold is based on at least one of:

a number of frames,

a number of superframes, and

a timing period.

20. A mobile device for power control in a wireless communication system, comprising:

means for determining at a given time whether a preceding transmission occurred at a time preceding the given time by less than a predetermined timing threshold;

means for computing, upon a positive determination that the transmission occurred at a time preceding the given time by less than the predetermined timing threshold, one or more of an open loop delta value, an open loop delta value based on an assigned bandwidth, and a bandwidth based on an assigned delta value, wherein the computations are based in part on a maximum allowable inter-cell interference parameter; and

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

21. A non-volatile, non-transitory, computer-readable storage medium comprising code for a causing a computer to:

determine at a given time whether a preceding transmission occurred at a time preceding the given time by less than a predetermined timing threshold;

compute, upon a positive determination that the transmission occurred at a time preceding the given time by less than the predetermined timing threshold, 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, wherein the computations are based in part on a maximum allowable inter-cell interference parameter; and

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

22. A method in a wireless communication system to facilitate reverse link power control, the method comprising:

conducting a transmission to a serving section on a reverse link;

determining whether the transmission occurred after a predetermined timing threshold after a preceding transmission;

computing, upon a positive determination that the transmission occurred after the predetermined timing threshold after the preceding transmission, at least one of an open loop delta value, an open loop delta value based on an assigned bandwidth, or a bandwidth based on a delta value; and

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