Processing

Please wait...

Settings

Settings

1. WO2008055132 - INTER-CELL POWER CONTROL IN THE PRESENCE OF FRACTIONAL FREQUENCY REUSE

Note: Text based on automatic Optical Character Recognition processes. Please use the PDF version for legal matters

Attorney Docket No.: 070336 32

CLAIMS

What is claimed is:

1. A method for generating a load indicator in a wireless communication system, the method comprising:
monitoring an interference metric associated with interference originated in a wireless communication sector;
determining a load indicator according to whether the interference metric exceeds a threshold; and
conveying the load indicator.

2. The method of claim 1 , the interference metric is at least one of an interference-to-noise ratio, a signal-to-noise ratio, a signal-to-interference ratio, and a signal-to-interference-and-noise ratio.

3. The method of claim 2, the interference metric is determined for a frequency resource, the frequency resource includes a frequency subband.

4. The method of claim 2, the interference metric is determined for a time resource, the time resource is at least one of a frame or a superframe.

5. The method of claim 3, the interference metric is an average over time-frequency resources.

6. The method of claim 5, the average is weighted arithmetic average, wherein weights are determined at least based on historic values or specific values of the time-frequency resource over which the average is taken.

7. The method of claim 5, the average is a weighted harmonic average, wherein weights are determined at least based on historic weight values or specific values of the time-frequency resource over which the average is taken.

Attorney Docket No.: 070336 33

8. The method of claim 5, the average is a geometric average.

9. The method of claim 1, a threshold is determined for disparate time-frequency resources.

10. The method of claim 7, a threshold is an average over time-frequency resources.

11. The method of claim 1 , determining a load indicator according to whether the interference metric exceeds a threshold includes employing a policy that determines threshold values over time-frequency resources.

12. The method of claim 11 , the policy is sector-specific.

13. The method of claim 11 , the policy determines a time interval at which the interference metric is monitored.

14. The method of claim 11 , the policy is inferred from historic data of a wireless communication sector response to interference management.

15. The method of claim 11 , the policy is adaptive and time dependent.

16. The method of claim 11 , the policy can be transferred from a first sector to multiple disparate sectors through a backhaul network communication.

17. The method of claim 1, a load indicator represents a logic binary state.

18. The method of claim 1 , conveying the load indicator includes broadcasting the load indicator over an air interface.

19. The method of claim 1, conveying the load indicator includes transmitting the load indicator over a backhaul communication network.

20. The method of claim 1, further comprising processing a set of load indicators received over a backhaul network communication.

Attorney Docket No.: 070336 34

21. The method of claim 20, processing a set of load indicators includes determining a set of frequency resources associated with the load indicators.

22. The method of claim 1, further comprising scheduling a transmission power assignment based on received load indicators.

23. An apparatus that operates in a wireless communication system, comprising:
means for determining an interference metric associated with interference originated in a wireless communication sector;
means for generating a load indicator associated with an interference metric in a time-frequency resource;
means for receiving a set of load indicators; and
means for scheduling a power density assignment.

24. The apparatus of claim 23, wherein means for determining an interference metric includes means for employing a policy that establishes a time interval to probe interference in a sector

25. The apparatus of claim 23, wherein means for generating a load indicator includes means for employing a policy that establishes a set of thresholds for interference metrics over frequency resources.

26. A wireless communication device, comprising:
at least one processor configured to monitor interference originated in a set of sectors, to broadcast a load indicator when an interference metric associated with the monitored interference exceeds a threshold, to convey a load indicator through a backhaul network communication, and to assign a transmission power based at least in part on the logic state of a received load indicator; and
a memory coupled to the at least one processor.

27. The wireless communication device of claim 26, the interference metric is at least one of an interference-to-noise ratio, a signal-to-noise ratio, a signal-to-interference ratio, and a signal-to-interference-and-noise ratio.

Attorney Docket No.: 070336 35

28. The wireless communication device of claim 26, the at least one processor further configured to employ a policy that establishes interference metric thresholds for disparate frequency resources.

29. The wireless communication device of claim 27, the policy is stored in a policy store that resides in the memory coupled to the at least one processor.

30. The wireless communication device of claim 27, to monitor interference originated in a set of sectors includes to measure interference at time intervals determined according to the policy.

31. The wireless communication device 26, the at least one processor further configured to perform an arithmetic average of an interference metric over frequency resources.

32. The wireless communication device of claim 26, the at least one processor further configured to perform a geometric average of an interference metric over frequency resources.

33. The wireless communication device of claim 26, the at least one processor further configured to perform a harmonic average of an interference metric over frequency resources.

34. The wireless communication device of claim 27, the at least one processor further configured to convey the policy to multiple disparate sectors through a backhaul network communication.

35. The wireless communication device of claim 27, wherein the policy includes time dependent interference metric thresholds.

36. The wireless communication device of claim 27, the policy is inferred from historic data of a wireless communication system response to interference management.

Attorney Docket No.: 070336 36

37. A computer program product, comprising
a computer-readable medium comprising:
code for causing at least one computer to monitor an interference metric associated with interference originated in a wireless communication sector;
code for causing the at least one computer to determine a load indicator according to whether the interference metric exceeds a threshold; and
code for causing the at least one computer to convey the load indicator.

38. A method that facilitates power control in a wireless communication system, the method comprising:
receiving a load indicator originated in a set of sectors;
decoding the load indicator corresponding to a non-serving sector with a highest signal-to-interference-and-noise ratio that operates in frequency bands assigned to a mobile terminal; and
adjusting the mobile terminal's transmission power according to a state of the decoded load indicator.

39. The method of claim 38, the frequency bands assigned to a mobile terminal are dictated by a received fractional frequency reuse pattern.

40. The method of claim 38, a state of the decoded load indicator is true when said indicator reflects interference metric exceeds a threshold, and false otherwise.

41. The method of claim 40, the threshold is an average of a set of thresholds associated with the frequency bands assigned to the mobile terminal.

42. The method of claim 41, the average is at least one of an arithmetic average, a harmonic average, or a geometric average.

43. The method of claim 41 , the set of thresholds associated with the frequency bands assigned to the mobile terminal is time dependent.

44. The method of claim 41, the set of thresholds associated with the frequency bands assigned to the mobile terminal is established through a policy.

Attorney Docket No.: 070336 37

45. The method of claim 44, the policy is determined by the non-serving sector and is sector specific.

46. The method of claim 40, adjusting the terminal's transmission power according to a state of the decoded load indicator includes decreasing the transmission power when the state is true.

47. The method of claim 40, adjusting the terminal's transmission power according to a state of the decoded load indicator includes increasing the transmission power when the state is false.

48. The method of claim 46, decreasing the transmission power comprises decrementing a current transmission power by a predetermined offset value ΔP0.

49. The method of claim 46, decreasing the transmission power comprises decrementing a current transmission power by a power adjustment offset ΔP(I) that depends at least on an interference metric value I associated with the decoded load indicator.

50. The method of claim 49, wherein ΔP(I) is inferred based at least on specific applications executed by the terminal, the applications include at least one of wireless on-line banking or internet browsing or searching.

51. The method of claim 50, wherein ΔP(I) is inferred based at least on specific data transmitted by the terminal.

52. The method of claim 38, adjusting the terminal's transmission power according to a state of the decoded load indicator includes employing a closed control loop.

53. A wireless communication device, comprising:
at least one processor configured to receive a load indicator originated in a set of sectors, to decode the load indicator corresponding to a non-serving sector with a Attorney Docket No.: 070336 38

highest signal-to-interference-and-noise ratio that shares a fractional frequency reuse pattern with a mobile terminal, and to decrease the mobile terminal's transmission power when a value of the decoded load indicator indicates an interference metric in the non-serving sector has exceeded a threshold; and
a memory coupled to the at least one processor.

54. The wireless communication device of claim 48, the at least one processor further configured to increase the mobile terminal's transmission power when a value of the decoded load indicator indicates an interference metric in the non-serving sector fails to exceed a threshold.

55. The wireless communication device of claim 48, to decrease the mobile terminal's power comprises to reduce a current transmission power by an offset value ΔP(I) that depends on the magnitude of the interference metric in the non-serving sector.

56. The wireless communication device of claim 49, to increase the mobile terminal's transmission power comprises to increment a current transmission power by a predetermined offset value ΔPo.

57. The wireless communication component device of claim 48, the at least one processor is further configured to receive a load indicator from a non-serving sector that operates in the frequency bands assigned to the mobile terminal.

58. The wireless communication device of claim 48, the at least one processor is further configured to receive a transmission power assignment from a serving sector in order to adjust transmission power in accordance to a load indicator state.

59. An apparatus that operates in a wireless communication environment, the apparatus comprising:
means for receiving a load indicator associated with the magnitude of an interference metric, the load indicator originated in a non-serving sector;
means for decoding the load indicator corresponding to a non-serving sector with a highest signal-to-interference-and-noise ratio that operates in a fractional frequency reuse assigned to an access terminal; and Attorney Docket No.: 070336 39

means for adjusting the mobile terminal's transmission power spectral density according to a state of the decoded load indicator.

60. A computer program product, comprising
a computer-readable medium comprising:
code for causing the at least one computer to decode the load indicator corresponding to a non-serving sector with a highest signal-to-interference-and-noise ratio that operates in frequency bands assigned to a mobile terminal, the frequency bands associated with a fractional frequency reuse pattern; and
code for causing the at least one computer to adjust the mobile terminal's transmission power according to a value of the decoded load indicator .