Approach for managing power for communications channels based on performance

• US 6,987,955 B1
• Filed: 04/26/2002
• Issued: 01/17/2006
• Est. Priority Date: 04/27/2001
• Status: Expired due to Term

• Current Assignee: Bandspeed, LLC
• Original Assignee: Bandspeed, Inc. (Broadcom, Inc.)
• Inventors: Xiang, Yong, Skafidas, Efstratios, Treister, Bijan, Gan, Hongbing, Sapozhnykov, Vitaliy
• Primary Examiner(s): Trinh, Sonny
• Assistant Examiner(s): DOAN, PHUOC HUU
• Application Number:
  US10/133,071
• Time in Patent Office: 1,362 Days
• Field of Search: 455/456.1, 455/403, 455/522, 455/127, 455/127.1, 455/127.5, 370/206, 370/318, 370/334, 370/338, 375/133
• US Class Current: 455/127.5
• CPC Class Codes: H04W 52/24 using SIR [Signal to Interference Ratio] or other wireless path parameters

Abstract

A novel approach for managing power for a plurality of communications channels based on communications channel performance is disclosed. According to one aspect of the invention, a first power and a second power that is different than the first power are determined based on performance data for the plurality of communications channels. The first power is used for communications that use a first communications channel, and the second power is used for communications that use a second communications channel. According to another aspect of the invention, a noise power is generated based on an error output of an equalizer that receives input from a communications channel, and a signal power is generated based on a signal output of the equalizer. A signal to noise ratio is determined based on the noise power and the signal power.

Claims

1. A method for managing power for a plurality of communications channels based on communications channel performance, the method comprising the computer-implemented steps of:

generating performance data based on communications at a first power over a first communications channel of the plurality of communications channels and communications at a second power over a second communications channel of the plurality of communications channels;

based on the performance data, determining a third power that is different than the first power;

causing the third power to be used for subsequent communications over the first communications channel;

based on the performance data, determining a fourth power that is different than the second power, wherein the fourth power is different than the third power; and

causing the fourth power to be used for subsequent communications over the second communications channel.

2. The method of claim 1, further comprising the computer-implemented step of:

based on additional performance data, modifying at least one of the third power and the fourth power.

3. The method of claim 1, wherein:

the first communications channel and the second communications channel communicatively couple a first participant and a second participant;

the first participant is selected from the group consisting of a master participant, a first wireless device, and a first mobile device; and

the second participant is selected from the group consisting of a slave participant, a second wireless device, and a second mobile device.

4. The method of claim 1, wherein:

the first communications channel and the second communications channel communicatively couple a first participant and a second participant; and

the first participant and the second participant are associated with a communications arrangement that uses a protocol that is selected from the group consisting of a first frequency hopping protocol and a second frequency hopping protocol that is defined by Institute of Electrical and Electronics Engineers 802.15.1 Wireless Personal Area Network Standard.

5. The method of claim 1, wherein the step of determining the third power includes the computer-implemented step of:

determining the third power based on performance data for the first communications channel and one or more attributes of a participant, wherein the one or more attributes of the participant include an identifier that distinguishes the participant from one or more other participants.

6. The method of claim 1, wherein:

a first participant and a second participant are communicatively coupled by both the first communications channel and the second communications channel;

the step of determining the third power includes the computer-implemented step of determining the third power based on performance data that is based on communications between the first participant and the second participant over the first communications channel; and

the step of determining the fourth power includes the computer-implemented step of determining the fourth power based on performance data that is based on communications between the first participant and the second participant over the second communications channel.

7. The method of claim 6, wherein the first participant and a third participant are communicatively coupled by the first communications channel, and wherein the method further comprises the computer-implemented step of:

based on performance data that is based on communications between the first participant and the third participant over the first communications channel, determining a fifth power for communications that use the first communications channel and that are between the first participant and the third participant.

8. The method of claim 1, wherein:

a first participant and a second participant are communicatively coupled by the first communications channel;

the step of determining the third power includes the computer-implemented step of;

determining the third power based on performance data that is based on communications from the first participant to the second participant over the first communications channel, wherein the third power is used for subsequent communications from the first participant to the second participant over the first communications channel; and

the method further comprises the computer-implemented step of;

determining a fifth power based on performance data that is based on communications from the second participant to the first participant over the first communications channel, wherein the fifth power is used for communications from the second participant to the first participant over the first communications channel, and wherein the fifth power is different from the third power.

9. The method of claim 1, wherein the step of generating the performance data includes the computer-implemented steps of:

generating an estimated signal to noise ratio based on one or more communications between a first participant and a second participant over the first communications channel; and

generating the performance data for the first communications channel, based on the estimated signal to noise ratio and a specified signal to noise ratio.

10. The method of claim 9, wherein the step of generating the estimated signal to noise ratio includes the computer-implemented steps of:

generating a noise power, based on an error output of an equalizer that receives input from the first communications channel;

generating a signal power, based on a signal output of the equalizer; and

determining the estimated signal to noise ratio, based on the noise power and the signal power.

11. The method of claim 1, further comprising the computer-implemented step of:

determining a power request value based on a measured performance value and a specified performance value.

12. The method of claim 1, further comprising the computer-implemented steps of:

generating performance data for the first communications channel based on one or more communications between a first participant and a second participant;

causing the performance data to be transferred from the second participant to the first participant; and

wherein the one or more communications are from the first participant to the second participant, and the second participant generates the performance data based on the one or more communications.

13. The method of claim 12, further comprising the computer-implemented step of:

causing additional performance data to be transferred from the first participant to the second participant, wherein the additional performance data is based on one or more additional communications from the second participant to the first participant.

14. The method of claim 12, wherein the step of causing the performance data to be transferred includes the computer-implemented steps of:

generating a packet that includes the performance data, wherein the packet includes at least one signed word of a specified length to represent a magnitude and direction of power change; and

transferring the packet from the second participant to the first participant.

15. The method of claim 1, wherein the step of determining the third power includes the computer-implemented steps of:

determining an initial power based on the performance data;

determining whether the initial power satisfies one or more criteria;

when the initial power satisfies the one or more criteria, using the initial power as the third power;

when the initial power fails to satisfy the one or more criteria;

generating a modified power; and

using the modified power as the third power.

16. The method of claim 15, wherein the one or more criteria include a minimum power, wherein the initial power is less than the minimum power, and the method further comprises the computer-implemented steps of:

generating the modified power based on the minimum power; and

using the modified power as the third power.

17. The method of claim 15, wherein the one or more criteria include a maximum power, wherein the initial power is greater than the maximum power, and the method further comprises the computer-implemented steps of:

generating the modified power based on the maximum power; and

using the modified power as the third power.

18. The method of claim 17, wherein performance of the first communications channel using the third power fails to satisfy one or more channel performance criteria, and the method further comprises the computer-implemented step of:

reducing the third power to less than the maximum power.

19. The method of claim 18, wherein the step of reducing the third power includes the computer-implemented step of:

reducing the third power to a particular power that is selected from the group consisting of a fifth power that is less than a minimum power and a sixth power that is about zero power.

20. The method of claim 1, wherein the performance data is based on determining signal to noise ratios of the first and second communications channels based on equalizer outputs by performing the following steps for each of the first and second communications channels;

generating a noise power, based on an error output of an equalizer that receives input from a communications channel;

generating a signal power, based on a signal output of the equalizer; and

determining a signal to noise ratio, based on the noise power and the signal power.

21. The method of claim 20, wherein the step of generating the noise power includes the computer-implemented steps of:

receiving two or more error samples from the error output of the equalizer;

generating two or more squared error samples by squaring each of the two or more error samples;

averaging the two or more squared error samples to generate the noise power;

receiving two or more signal samples from the signal output of the equalizer;

generating two or more squared signal samples by squaring each of the two or more signal samples; and

averaging the two or more squared signal samples to generate the signal power.

22. The method of claim 20, wherein:

the step of generating the noise power includes the computer-implemented steps of;

receiving a specified number of error samples from the error output of the equalizer;

generating the specified number of squared error samples by squaring each of the specified number of error samples; and

averaging the specified number of squared error samples to generate the noise power;

the step of generating the signal power includes the computer-implemented steps of;

receiving the specified number of signal samples from the signal output of the equalizer;

generating the specified number of squared signal samples by squaring each of the specified number of signal samples; and

averaging the specified number of squared signal samples to generate the signal power.

23. The method of claim 20, wherein the equalizer receives input from one communications channel.

24. The method of claim 20, wherein the equalizer receives input from each of a plurality of communications channels, and the steps of generating the noise power, generating the signal power, and determining the signal to noise ratio are performed for two or more communications channels of the plurality of communications channels.

25. The method of claim 24, wherein:

the plurality of communications channels are based on a frequency hopping protocol; and

the equalizer is associated with a device that is selected from the group consisting of a wireless device and a mobile device.

26. The method of claim 20, wherein the equalizer is selected from the group consisting of a linear equalizer, a transversal filter, a nonlinear equalizer, and a decision feedback equalizer.

27. The method of claim 20, wherein the equalizer operates in a decision directed mode.

28. The method of claim 20, wherein the communications channel is the first communications channel, the signal to noise ratio is a first signal to noise ratio, and the method further comprises the computer-implemented steps of:

based on the first signal to noise ratio, determining the third power for transmitting communications over the first communications channel;

based on an additional error output of the equalizer that receives input from a second communications channel, generating an additional noise power;

based on an additional signal output of the equalizer that receives input from the second communications channel, generating an additional signal power;

based on the additional noise power and the additional signal power, determining a second signal to noise ratio; and

based on the second signal to noise ratio, determining a fifth power for transmitting communications over the second communications channel.

29. A communications device comprising a power control mechanism configured to:

generate performance data based on communications at a first power over a first communications channel of the plurality of communications channels and communications at a second power over a second communications channel of the plurality of communications channels;

based on the performance data, determine a third power that is different than the first power;

cause the third power to be used for subsequent communications over the first communications channel;

based on the performance data, determine a fourth power that is different than the second power, wherein the fourth power is different than the third power; and

cause the fourth power to be used for subsequent communications over the second communications channel.

30. The communications device of claim 29, wherein the power control mechanism is further configured to:

based on additional performance data, modify at least one of the third power and the fourth power.

31. The communications device of claim 29, wherein the communications device is selected from the group consisting of a master participant, a slave participant, a wireless device, and a mobile device.

32. The communications device of claim 29, wherein the communications device is a first communications device, wherein the first communications device communicates with a second communications device over the first communications channel, and wherein the power control mechanism is further configured to:

determine the third power based on performance data that is based on communications from the first communications device to the second communications device over the first communications channel, wherein the third power is used for subsequent communications from the first communications device to the second communications device over the first communications channel; and

determine a fifth power based on performance data that is based on communications from the second communications device to the first communications device over the first communications channel, wherein the fifth power is used for communications from the second communications device to the first communications device over the first communications channel, and wherein the fifth power is different from the third power.

33. The communications device of claim 29, wherein the performance data is based on signal to noise ratios of the first and second communications channels that are generated by a mechanism configured to:

generate a noise power, based on error data that is generated by an equalizer;

generate a signal power, based on signal data that is generated by the equalizer; and

determine a signal to noise ratio, based on the noise power and the signal power.

34. The communications device of claim 33, wherein the mechanism is further configured to:

receive a specified number of error samples from the equalizer;

generate a specified number of squared error samples by squaring each of the specified number of error samples;

average the specified number of squared error samples to generate the noise power;

receive the specified number of signal samples from the equalizer;

generate a specified number of squared signal samples by squaring each of the specified number of signal samples; and

average the specified number of squared signal samples to generate the signal power.

35. The communications device of claim 33, wherein the equalizer is selected from the group consisting of a linear equalizer, a transversal filter, a nonlinear equalizer, and a decision feedback equalizer.

36. The communications device of claim 33, further comprising the equalizer.

37. The communications device of claim 33, wherein the communications device is selected from the group consisting of a mobile device and a wireless device.

38. A computer-readable medium carrying one or more sequences of instructions for managing power for a plurality of communications channels based on communications channel performance, wherein execution of the one or more sequences of instructions by one or more processors causes the one or more processors to perform the steps of:

generating performance data based on communications at a first power over a first communications channel of the plurality of communications channels and communications at a second power over a second communications channel of the plurality of communications channels;

based on the performance data, determining a third power that is different than the first power;

causing the third power to be used for subsequent communications over the first communications channel;

based on the performance data, determining a fourth power that is different than the second power, wherein the fourth power is different than the third power; and

causing the fourth power to be used for subsequent communications over the second communications channel.

39. The computer-readable medium of claim 38, wherein the performance data is based on determining signal to noise ratios of the first and second communications channels based on equalizer outputs, and wherein the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform for each of the first and second communications channels the steps of:

based on an error output of an equalizer that receives input from a communications channel, generating a noise power;

based on a signal output of the equalizer, generating a signal power; and

based on the noise power and the signal power, determining a signal to noise ratio.

40. The computer-readable medium of claim 39, wherein the instructions for generating the noise power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

receiving two or more error samples from the error output of the equalizer;

generating two or more squared error samples by squaring each of the two or more error samples;

averaging the two or more squared error samples to generate the noise power;

receiving two or more signal samples from the signal output of the equalizer;

generating two or more squared signal samples by squaring each of the two or more signal samples; and

averaging the two or more squared signal samples to generate the signal power.

41. The computer-readable medium of claim 39, wherein:

the instructions for generating the noise power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of;

receiving a specified number of error samples from the error output of the equalizer;

generating the specified number of squared error samples by squaring each of the specified number of error samples; and

averaging the specified number of squared error samples to generate the noise power;

the instructions for generating the signal power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of;

receiving the specified number of signal samples from the signal output of the equalizer;

generating the specified number of squared signal samples by squaring each of the specified number of signal samples; and

averaging the specified number of squared signal samples to generate the signal power.

42. The computer-readable medium of claim 39, wherein the equalizer receives input from one communications channel.

43. The computer-readable medium of claim 39, wherein the equalizer receives input from each of a plurality of communications channels, and wherein generating the noise power, generating the signal power, and determining the signal to noise ratio are performed for two or more communications channels of the plurality of communications channels.

44. The computer-readable medium of claim 43, wherein:

the plurality of communications channels are based on a frequency hopping protocol; and

the equalizer is associated with a device that is selected from the group consisting of a wireless device and a mobile device.

45. The computer-readable medium of claim 39, wherein the equalizer is selected from the group consisting of a linear equalizer, a transversal filter, a nonlinear equalizer, and a decision feedback equalizer.

46. The computer-readable medium of claim 39, wherein the equalizer operates in a decision directed mode.

47. The computer-readable medium of claim 39, wherein the communications channel is the first communications channel, the signal to noise ratio is a first signal to noise ratio, and the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

based on the first signal to noise ratio, determining the third power for transmitting communications over the first communications channel;

based on an additional error output of the equalizer that receives input from a second communications channel, generating an additional noise power;

based on an additional signal output of the equalizer that receives input from the second communications channel, generating an additional signal power;

based on the additional noise power and the additional signal power, determining a second signal to noise ratio; and

based on the second signal to noise ratio, determining a fifth power for transmitting communications over the second communications channel.

48. The computer-readable medium of claim 38, further comprising one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

based on additional performance data, modifying at least one of the third power and the fourth power.

49. The computer-readable medium of claim 38, wherein:

the first communications channel and the second communications channel communicatively couple a first participant and a second participant;

the first participant is selected from the group consisting of a master participant, a first wireless device, and a first mobile device; and

the second participant is selected from the group consisting of a slave participant, a second wireless device, and a second mobile device.

50. The computer-readable medium of claim 38, wherein:

the first communications channel and the second communications channel communicatively couple a first participant and a second participant; and

the first participant and the second participant are associated with a communications arrangement that uses a protocol that is selected from the group consisting of a first frequency hopping protocol and a second frequency hopping protocol that is defined by Institute of Electrical and Electronics Engineers 802.15.1 Wireless Personal Area Network Standard.

51. The computer-readable medium of claim 38, wherein the instructions for determining the third power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

determining the third power based on performance data for the first communications channel and one or more attributes of a participant, wherein the one or more attributes of the participant include an identifier that distinguishes the participant from one or more other participants.

52. The computer-readable medium of claim 38, wherein:

a first participant and a second participant are communicatively coupled by both the first communications channel and the second communications channel;

the instructions for determining the third power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of determining the third power based on performance data that is based on communications between the first participant and the second participant over the first communications channel; and

the instructions for determining the fourth power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of determining the fourth power based on performance data that is based on communications between the first participant and the second participant over the second communications channel.

53. The computer-readable medium of claim 52, wherein the first participant and a third participant are communicatively coupled by the first communications channel, and wherein the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

based on performance data that is based on communications between the first participant and the third participant over the first communications channel, determining a fifth power for communications that use the first communications channel and that are between the first participant and the third participant.

54. The computer-readable medium of claim 38, wherein:

a first participant and a second participant are communicatively coupled by the first communications channel;

the instructions for determining the third power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of;

determining the third power based on performance data that is based on communications from the first participant to the second participant over the first communications channel, wherein the third power is used for subsequent communications from the first participant to the second participant over the first communications channel; and

the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of;

determining a fifth power based on performance data that is based on communications from the second participant to the first participant over the first communications channel, wherein the fifth power is used for communications from the second participant to the first participant over the first communications channel, and wherein the fifth power is different from the third power.

55. The computer-readable medium of claim 38, wherein the instructions for generating the performance data include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating an estimated signal to noise ratio based one or more communications between a first participant and a second participant over the first communications channel; and

generating the performance data for the first communications channel, based on the estimated signal to noise ratio and a specified signal to noise ratio.

56. The computer-readable medium of claim 55, wherein the instructions for generating the estimated signal to noise ratio include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating a noise power, based on an error output of an equalizer that receives input from the first communications channel;

generating a signal power, based on a signal output of the equalizer; and

determining the estimated signal to noise ratio, based on the noise power and the signal power.

57. The computer-readable medium of claim 38, further comprising one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

determining a power request value based on a measured performance value and a specified performance value.

58. The computer-readable medium of claim 38, further comprising one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating performance data for the first communications channel based on one or more communications between a first participant and a second participant;

causing the performance data to be transferred from the second participant to the first participant; and

wherein the one or more communications are from the first participant to the second participant, and the second participant generates the performance data based on the one or more communications.

59. The computer-readable medium of claim 58, further comprising one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

causing additional performance data to be transferred from the first participant to the second participant, wherein the additional performance data is based on one or more additional communications from the second participant to the first participant.

60. The computer-readable medium of claim 58, wherein the instructions for causing the performance data to be transferred include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating a packet that includes the performance data, wherein the packet includes at least one signed word of a specified length to represent a magnitude and direction of power change; and

transferring the packet from the second participant to the first participant.

61. The computer-readable medium of claim 38, wherein the instructions for determining the third power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

determining an initial power based on the performance data;

determining whether the initial power satisfies one or more criteria;

when the initial power satisfies the one or more criteria, using the initial power as the third power;

when the initial power fails to satisfy the one or more criteria;

generating a modified power; and

using the modified power as the third power.

62. The computer-readable medium of claim 61, wherein the one or more criteria include a minimum power, wherein the initial power is less than the minimum power, and the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating the modified power based on the minimum power; and

using the modified power as the third power.

63. The computer-readable medium of claim 61, wherein the one or more criteria include a maximum power, wherein the initial power is greater than the maximum power, and the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the steps of:

generating the modified power based on the maximum power; and

using the modified power as the third power.

64. The computer-readable medium of claim 63, wherein performance of the first communications channel using the third power fails to satisfy one or more channel performance criteria, and the computer-readable medium further comprises one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

reducing the third power to less than the maximum power.

65. The computer-readable medium of claim 64, wherein the instructions for reducing the third power include one or more sequences of instructions which, when executed by the one or more processors, causes the one or more processors to perform the step of:

reducing the third power to a particular power that is selected from the group consisting of a fifth power that is less than a minimum power and a sixth power that is about zero power.