Determining a phase adjustment in accordance with power trends

• US 20060270359A1
• Filed: 05/24/2005
• Published: 11/30/2006
• Est. Priority Date: 05/24/2005
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Magnolia Broadband Incorporated
• Inventors: Karmi, Yair, Harel, Haim, Kludt, Kenneth A.
• Granted Patent: US 7,616,930 B2
• Time in Patent Office: Days
• US Class Current: 455/69
• CPC Class Codes: H04B 7/0632 Channel quality parameters, e.g. channel quality indicator [CQI]

Abstract

Calculating a phase adjustment includes establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device. A control signal is received. The control signal comprises windows communicating power indicators that reflect the power of the signal. A previous window communicates power indicators reflecting the power of the signal, and a current window communicates current power indicators reflecting the power of the signal. A previous power trend is estimated from previous power indicators, and a current power trend is estimated from current power indicators. A power trend change is determined from the previous power trend and the current power trend, and a phase increment is determined in accordance with the power trend change. A next phase adjustment is calculated from the current phase adjustment and the phase increment.

Claims

1. A method for calculating a phase adjustment, comprising:

establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

receiving a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising;

one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimating a previous power trend from the one or more previous power indicators;

estimating a current power trend from the one or more current power indicators;

determining a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend;

determining a phase increment in accordance with the power trend change; and

calculating a next phase adjustment from the current phase adjustment and the phase increment.

2. The method of claim 1, wherein:

the current window comprises a plurality of participating slots; and

estimating the current power trend from the one or more current power indicators further comprises;

establishing an initial slot power value from an initial power indicator of an initial participating slot;

establishing a final slot power value from a final power indicator of a final participating slot; and

determining a difference between the initial slot power value and the final slot power value to estimate the current power trend.

3. The method of claim 1, wherein determining the phase increment in accordance with the power trend change further comprises:

establishing if the power trend change is greater than a power trend change threshold;

determining the phase increment using a power change if the power trend change is less than the power trend change threshold, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment independent of the power change if the power trend change is greater than the power trend change threshold.

4. The method of claim 1, wherein determining the phase increment in accordance with the power trend change further comprises:

establishing that the power trend change is greater than a power trend change threshold; and

determining the phase increment from the power trend change.

5. The method of claim 1, wherein determining the phase increment in accordance with the power trend change further comprises:

establishing that the power trend change is less than a power trend change threshold;

calculating a power change, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment in accordance with the power change.

6. The method of claim 5, wherein determining the phase increment in accordance with the power change further comprises:

establishing whether the power change is greater than a power change threshold;

calculating the phase increment according to a larger step parameter if the power change is greater than the power change threshold, a step parameter used to control a magnitude of a phase adjustment; and

calculating the phase increment using a smaller step parameter if the power change is less than the power change threshold, the smaller step parameter less than the larger step parameter.

7. The method of claim 1, wherein determining the phase increment in accordance with the power trend change further comprises:

encountering a zero phase change situation; and

applying a zero phase increment technique to the zero phase change situation.

8. The method of claim 1, wherein determining the phase increment in accordance with the power trend change further comprises:

determining the phase increment using one of the power trend change and the power change.

9. A system for calculating a phase adjustment, comprising:

an interface operable to receive and send a plurality of signals, the plurality of signals to be transmitted from a modifying communication device to a feedback communication device; and

control logic coupled to the interface and operable to;

establish a current phase adjustment for a signal transmitted from the modifying communication device to the feedback communication device;

receive a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising;

one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimate a previous power trend from the one or more previous power indicators;

estimate a current power trend from the one or more current power indicators;

determine a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend;

determine a phase increment in accordance with the power trend change; and

calculate a next phase adjustment from the current phase adjustment and the phase increment.

10. The system of claim 9, wherein:

the current window comprises a plurality of participating slots; and

the control logic is further operable to estimate the current power trend from the one or more current power indicators by;

establishing an initial slot power value from an initial power indicator of an initial participating slot;

establishing a final slot power value from a final power indicator of a final participating slot; and

determining a difference between the initial slot power value and the final slot power value to estimate the current power trend.

11. The system of claim 9, the control logic further operable to determine the phase increment in accordance with the power trend change by:

establishing if the power trend change is greater than a power trend change threshold;

determining the phase increment using a power change if the power trend change is less than the power trend change threshold, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment independent of the power change if the power trend change is greater than the power trend change threshold.

12. The system of claim 9, the control logic further operable to determine the phase increment in accordance with the power trend change by:

establishing that the power trend change is greater than a power trend change threshold; and

determining the phase increment from the power trend change.

13. The system of claim 9, the control logic further operable to determine the phase increment in accordance with the power trend change by:

establishing that the power trend change is less than a power trend change threshold;

calculating a power change, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment in accordance with the power change.

14. The system of claim 13, the control logic further operable to determine the phase increment in accordance with the power change by:

establishing whether the power change is greater than a power change threshold;

calculating the phase increment according to a larger step parameter if the power change is greater than the power change threshold, a step parameter used to control a magnitude of a phase adjustment; and

calculating the phase increment using a smaller step parameter if the power change is less than the power change threshold, the smaller step parameter less than the larger step parameter.

15. The system of claim 9, the control logic further operable to determine the phase increment in accordance with the power trend change by:

encountering a zero phase change situation; and

applying a zero phase increment technique to the zero phase change situation.

16. The system of claim 9, the control logic further operable to determine the phase increment in accordance with the power trend change by:

determining the phase increment using one of the power trend change and the power change.

17. Logic for calculating a phase adjustment, the logic embodied in a computer-readable medium and operable to:

establish a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

receive a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising;

one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimate a previous power trend from the one or more previous power indicators;

estimate a current power trend from the one or more current power indicators;

determine a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend;

determine a phase increment in accordance with the power trend change; and

calculate a next phase adjustment from the current phase adjustment and the phase increment.

18. The logic of claim 17, wherein:

the current window comprises a plurality of participating slots; and

the logic is further operable to estimate the current power trend from the one or more current power indicators by;

establishing an initial slot power value from an initial power indicator of an initial participating slot;

establishing a final slot power value from a final power indicator of a final participating slot; and

determining a difference between the initial slot power value and the final slot power value to estimate the current power trend.

19. The logic of claim 17, further operable to determine the phase increment in accordance with the power trend change by:

establishing if the power trend change is greater than a power trend change threshold;

determining the phase increment using a power change if the power trend change is less than the power trend change threshold, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment independent of the power change if the power trend change is greater than the power trend change threshold.

20. The logic of claim 17, further operable to determine the phase increment in accordance with the power trend change by:

establishing that the power trend change is greater than a power trend change threshold; and

determining the phase increment from the power trend change.

21. The logic of claim 17, further operable to determine the phase increment in accordance with the power trend change by:

establishing that the power trend change is less than a power trend change threshold;

calculating a power change, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window; and

determining the phase increment in accordance with the power change.

22. The logic of claim 21, further operable to determine the phase increment in accordance with the power change by:

establishing whether the power change is greater than a power change threshold;

calculating the phase increment according to a larger step parameter if the power change is greater than the power change threshold, a step parameter used to control a magnitude of a phase adjustment; and

calculating the phase increment using a smaller step parameter if the power change is less than the power change threshold, the smaller step parameter less than the larger step parameter.

23. The logic of claim 17, further operable to determine the phase increment in accordance with the power trend change by:

encountering a zero phase change situation; and

applying a zero phase increment technique to the zero phase change situation.

24. The logic of claim 17, further operable to determine the phase increment in accordance with the power trend change by:

determining the phase increment using one of the power trend change and the power change.

25. A system for calculating a phase adjustment, comprising:

means for establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

means for receiving a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising;

one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

means for estimating a previous power trend from the one or more previous power indicators;

means for estimating a current power trend from the one or more current power indicators;

means for determining a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend;

means for determining a phase increment in accordance with the power trend change; and

means for calculating a next phase adjustment from the current phase adjustment and the phase increment.

26. A method for calculating a phase adjustment, comprising:

establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

receiving a control signal comprising a plurality of windows, a window communicating one or more power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of windows comprising;

one or more previous windows, a previous window communicating one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

a current window communicating one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimating a previous power trend from the one or more previous power indicators;

estimating a current power trend from the one or more current power indicators, the current window comprising a plurality of participating slots, the current power trend estimated by;

establishing an initial slot power value from an initial power indicator of an initial participating slot;

establishing a final slot power value from a final power indicator of a final participating slot; and

determining a difference between the initial slot power value and the final slot power value to estimate the current power trend;

determining a power trend change from the previous power trend and the current power trend, the power trend change representing a change between the previous power trend and the current power trend;

determining a phase increment in accordance with the power trend change by;

establishing if the power trend change is greater than a power trend change threshold;

determining the phase increment using a power change if the power trend change is less than the power trend change threshold, the power change representing the difference between a current window power value of the current window and a previous window power value of the previous window, the phase increment determined using the power change by;

calculating the power change; and

determining the phase increment in accordance with the power change by;

establishing whether the power change is greater than a power change threshold;

calculating the phase increment according to a larger step parameter if the power change is greater than the power change threshold, a step parameter used to control a magnitude of a phase adjustment; and

calculating the phase increment using a smaller step parameter if the power change is less than the power change threshold, the smaller step parameter less than the larger step parameter; and

determining the phase increment from the power trend change and independent of the power change if the power trend change is greater than the power trend change threshold;

encountering a zero phase change situation;

applying a zero phase increment technique to the zero phase change situation.

determining the phase increment using one of the power trend change and the power change; and

calculating a next phase adjustment from the current phase adjustment and the phase increment.

27. A method for calculating a phase adjustment, comprising:

establishing a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

receiving a plurality of power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of power indicators comprising;

one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimating a previous power descriptor value from the one or more previous power indicators;

estimating a current power descriptor value from the one or more current power indicators;

determining a phase increment in accordance with the previous power descriptor value and the current power descriptor value; and

calculating a next phase adjustment from the current phase adjustment and the phase increment.

28. The method of claim 27, wherein receiving the plurality of power indicators further comprises:

receiving a control signal comprising a plurality of windows comprising;

one or more previous windows, a previous window communicating the one or more previous power indicators; and

a current window communicating the one or more current power indicators.

29. The method of claim 27, wherein:

the previous power descriptor value comprises a previous power trend value; and

the current power descriptor value comprises a current power trend value.

30. The method of claim 27, wherein:

the previous power descriptor value comprises a previous power value; and

the current power descriptor value comprises a current power value.

31. The method of claim 27, wherein estimating the current power descriptor value from the one or more current power indicators further comprises:

receiving a late power indicator;

weighting the late power indicator to yield a weighted late power indicator; and

estimating the current power descriptor value using the one or more current power indicators and the weighted power indicator.

32. The method of claim 27, wherein determining the phase increment in accordance with the previous power descriptor value and the current power descriptor value further comprises:

accessing a lookup table comprising a plurality of entries, an entry associating a possible previous power descriptor value and a possible current power descriptor value with a modification;

identifying an entry corresponding to the previous power descriptor value and the current power descriptor value; and

determining the phase increment in accordance with the modification of the identified entry.

33. A system for calculating a phase adjustment, comprising:

an interface operable to receive and send a plurality of signals, the plurality of signals to be transmitted from a modifying communication device to a feedback communication device; and

control logic coupled to the interface and operable to;

establish a current phase adjustment for a signal transmitted from the modifying communication device to the feedback communication device;

receive a plurality of power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of power indicators comprising;

one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimate a previous power descriptor value from the one or more previous power indicators;

estimate a current power descriptor value from the one or more current power indicators;

determine a phase increment in accordance with the previous power descriptor value and the current power descriptor value; and

calculate a next phase adjustment from the current phase adjustment and the phase increment.

34. The system of claim 33, the control logic further operable to receive the plurality of power indicators by:

receiving a control signal comprising a plurality of windows comprising;

one or more previous windows, a previous window communicating the one or more previous power indicators; and

a current window communicating the one or more current power indicators.

35. The system of claim 33, wherein:

the previous power descriptor value comprises a previous power trend value; and

the current power descriptor value comprises a current power trend value.

36. The system of claim 33, wherein:

the previous power descriptor value comprises a previous power value; and

the current power descriptor value comprises a current power value.

37. The system of claim 33, the control logic further operable to estimate the current power descriptor value from the one or more current power indicators by:

receiving a late power indicator;

weighting the late power indicator to yield a weighted late power indicator; and

estimating the current power descriptor value using the one or more current power indicators and the weighted power indicator.

38. The system of claim 33, the control logic further operable to determine the phase increment in accordance with the previous power descriptor value and the current power descriptor value by:

accessing a lookup table comprising a plurality of entries, an entry associating a possible previous power descriptor value and a possible current power descriptor value with a modification;

identifying an entry corresponding to the previous power descriptor value and the current power descriptor value; and

determining the phase increment in accordance with the modification of the identified entry.

39. The system of claim 33, wherein:

the previous power descriptor value comprises a previous power trend value;

the current power descriptor value comprises a current power trend value;

the previous power descriptor value comprises a previous power value;

the current power descriptor value comprises a current power value; and

the control logic is further operable to;

receive the plurality of power indicators by;

receiving a control signal comprising a plurality of windows comprising;

one or more previous windows, a previous window communicating the one or more previous power indicators; and

a current window communicating the one or more current power indicators;

estimate the current power descriptor value from the one or more current power indicators by;

receiving a late power indicator;

weighting the late power indicator to yield a weighted late power indicator; and

estimating the current power descriptor value using the one or more current power indicators and the weighted power indicator; and

determine the phase increment in accordance with the previous power descriptor value and the current power descriptor value by;

accessing a lookup table comprising a plurality of entries, an entry associating a possible previous power descriptor value and a possible current power descriptor value with a modification;

identifying an entry corresponding to the previous power descriptor value and the current power descriptor value; and

determining the phase increment in accordance with the modification of the identified entry.

40. Logic for calculating a phase adjustment, the logic embodied in a computer-readable medium and operable to:

establish a current phase adjustment for a signal transmitted from a modifying communication device to a feedback communication device;

receive a plurality of power indicators, a power indicator reflecting the power of the signal as received by the feedback communication device, the plurality of power indicators comprising;

one or more previous power indicators reflecting the power of the signal adjusted according to a previous phase adjustment; and

one or more current power indicators reflecting the power of the signal adjusted according to the current phase adjustment;

estimate a previous power descriptor value from the one or more previous power indicators;

estimate a current power descriptor value from the one or more current power indicators;

determine a phase increment in accordance with the previous power descriptor value and the current power descriptor value; and

calculate a next phase adjustment from the current phase adjustment and the phase increment.

41. The logic of claim 40, further operable to receive the plurality of power indicators by:

receiving a control signal comprising a plurality of windows comprising;

one or more previous windows, a previous window communicating the one or more previous power indicators; and

a current window communicating the one or more current power indicators.

42. The logic of claim 40, wherein:

the previous power descriptor value comprises a previous power trend value; and

the current power descriptor value comprises a current power trend value.

43. The logic of claim 40, wherein:

the previous power descriptor value comprises a previous power value; and

the current power descriptor value comprises a current power value.

44. The logic of claim 40, further operable to estimate the current power descriptor value from the one or more current power indicators by:

receiving a late power indicator;

weighting the late power indicator to yield a weighted late power indicator; and

estimating the current power descriptor value using the one or more current power indicators and the weighted power indicator.

45. The logic of claim 40, wherein determining the phase increment in accordance with the previous power descriptor value and the current power descriptor value further comprises:

accessing a lookup table comprising a plurality of entries, an entry associating a possible previous power descriptor value and a possible current power descriptor value with a modification;

identifying an entry corresponding to the previous power descriptor value and the current power descriptor value; and

determining the phase increment in accordance with the modification of the identified entry.