Uplink power control using loopback communications carriers

• US 7,120,392 B2
• Filed: 10/09/2003
• Issued: 10/10/2006
• Est. Priority Date: 10/11/2002
• Status: Active Grant

• Current Assignee: Jeffrey C. Chu, Glowlink Communications Technology, Inc. (Singapore Technologies Engineering Limited)
• Original Assignee: Glowlink Communications Technology, Inc. (Singapore Technologies Engineering Limited)
• Inventors: Downey, Michael L., Chu, Jeffrey C.
• Primary Examiner(s): Urban, Edward F.
• Assistant Examiner(s): Lee, John J.
• Application Number:
  US10/684,147
• Publication Number:
  US 20040127157A1
• Time in Patent Office: 1,097 Days
• Field of Search: 455/69, 455/522, 455/515, 455/517, 455/67.11, 455/68, 455/115.1, 455/9, 455/13.4, 455/15, 455/11.1, 455/13.2, 455/13.1, 455/67.14, 455/12.1, 455/427, 455/428, 455/429, 455/24, 370/316, 370/335, 370/347
• US Class Current: 455/69
• CPC Class Codes: H04W 52/08 Closed loop power control
• CPC Class Codes: H04W 52/146 Uplink power control
• CPC Class Codes: H04W 52/221 using past power control commands
• CPC Class Codes: H04W 52/225 Calculation of statistics, e.g. average, variance
• CPC Class Codes: H04W 52/228 using past power values or information

Abstract

A method for providing power control to a uplink signal, comprising an uplink station transmitting an uplink signal to a satellite. The satellite also transmits a loopback signal representing the received uplink signal back to the uplink station. The satellite also transmits a beacon signal to the uplink station. The uplink station adjusts the power of the uplink signal based on measurements of the beacon signal and the uplink signal.

Claims

1. A system for providing performance control of a first signal transmitted by a first station to a second station, comprising:

a means for measuring a performance parameter of a second signal that is transmitted to the first station from the second station;

a means for measuring a performance parameter of a third signal that is transmitted to the first station from the second station and is representative of the first signal as received by the second station;

a means for performing a first adjustment to the power of the first signal in response the performance parameter of the second signal; and

a means for performing a second adjustment to the power of the first signal in response the performance parameter of the third signal.

2. The system of claim 1, where the second station is a satellite.

3. The system of claim 1, wherein timing of the performance of the first adjustment is independent of timing of the performance of the second adjustment.

4. The system of claim 1, wherein the performance parameters of the second and third signals are measured repeatedly and the first and second adjustments are made repeatedly.

5. The system of claim 1, wherein the means for measuring the performance parameter of the second signal includes a weighted average of a current measurement of the performance parameter of the second signal and at least one past measurement of the performance parameter of the second signal.

6. The system of claim 1, wherein the performance parameter of the second signal is indirectly related to the performance of the first signal.

7. The system of claim 1, wherein the performance parameter of the third signal is directly related to the performance of the first signal.

8. The system of claim 1, wherein the means for performing the first adjustment is based on a first no adjust region, where the first no adjust region is a region encompassing a first nominal level for the performance parameter of the second signal, the region having an a first upper bound and a first lower bound.

9. The system of claim 8, the first adjustment is substantially zero when a current performance parameter of the second signal and a past performance parameter of the second signal and within the first no adjust region.

10. The system of claim 8, wherein the use of the first no adjust region includes relating the first adjustment to the first nominal level minus a current performance parameter of the second signal when the current performance parameter of the second signal is outside the no adjust region and a past performance parameter of the second signal is within the first no adjust region.

11. The system of claim 8, wherein the use of the first no adjust region includes relating the first adjustment to a past performance parameter of the second signal minus the first nominal level when a current performance parameter of the second signal is within the first no adjust region and the past performance parameter of the second signal is outside the first no adjust region.

12. The system of claim 8, wherein the use of the first no adjust region includes relating the first adjustment to a past performance parameter of the second signal minus a current performance parameter of the second signal when the current and the past performance parameters of the second signal are outside the first no adjust region.

13. The system of claim 1, wherein the means for performing a second adjustment is based on relating the second adjustment to the difference between a second nominal level minus a current performance parameter of the third signal.

14. The system of claim 1, wherein the means for performing a second adjustment is based on a second no adjust region, where the second no adjust region is a region encompassing a second nominal level forte performance parameter of the third signal, the region having an a second upper bound and a second lower bound.

15. The system of claim 14, the second adjustment is substantially zero when a current performance parameter of the third signal is within the second no adjust region.

16. The system of claim 14, wherein performing the second adjustment is performed in accordance with the following:

$\begin{array}{cc}\left(\underset{k=0}{\overset{N-1}{⩓<br><br>}}<br><br><br><br>\left({\mathrm{CP}}_m<br><br>\left(n-k\right)><br><br>A\right)\right)\bigwedge <br><br>\left(A\ge <br><br>{\mathrm{CP}}_m<br><br>\left(n-N\right)\right)\Rightarrow <br><br>\mathrm{\Delta <br><br>}<br><br><br><br>P_2=\left({\mathrm{CP}}_p-{\mathrm{CP}}_m<br><br>\left(n\right)\right)*W_N.& \end{array}$

17. The system of claim 14, wherein performing the second adjustment is performed in accordance with the following:

$\left(\underset{k=0}{\overset{N-1}{⩓<br><br>}}<br><br><br><br>\left({\mathrm{CP}}_m<br><br>\left(n-k\right)<<br><br>B\right)\right)\bigwedge <br><br>\left(B\le <br><br>{\mathrm{CP}}_m<br><br>\left(n-N\right)\right)\Rightarrow <br><br>\mathrm{\Delta <br><br>}<br><br><br><br>P_2=\left({\mathrm{CP}}_p-{\mathrm{CP}}_m<br><br>\left(n\right)\right)*W_N.$

18. A method for providing performance control of a first signal transmitted by a first station to a second station, comprising:

measuring a performance parameter of a second signal that is transmitted to the first station from the second station;

measuring a performance parameter of a third signal that is transmitted to the first station from the second station and is representative of the first signal as received by the second station;

performing a first adjustment to the power of the first signal in response the performance parameter of the second signal; and

performing a second adjustment to the power of the first signal in response the performance parameter of the third signal.

19. The method of claim 18, where the second station is a satellite.

20. The method of claim 18, where the timing of the performance of the first adjustment is independent of the performance of the second adjustment.

21. The method of claim 18, wherein the performance parameters of the second and third signals are measured repeatedly and the first and second adjustments are made repeatedly.

22. The method of claim 18, wherein the measuring of the performance parameter of the second signal includes a weighted average of a current measurement of the performance parameter of the second signal and at least one past measurement of the performance parameter of the second signal.

23. The method of claim 18, wherein the performance parameter of the second signal is indirectly related to the performance of the first signal.

24. The method of claim 18, wherein the performance parameter of the third signal is directly related to the performance of the first signal.

25. The method of claim 18, wherein the performing of the first adjustment is based on a first no adjust region, where the first no adjust region is a region encompassing a first nominal level for the performance parameter of the second signal, the region having an a first upper bound and a first lower bound.

26. The method of claim 25, the first adjustment is substantially zero when a current performance parameter of the second signal and a past performance parameter of the second signal are within the first no adjust region.

27. The method of claim 25, wherein the use of the first no adjust region includes relating the first adjustment to the first nominal level minus a current performance parameter of the second signal when the current performance parameter of the second signal is outside the no adjust region and a past performance parameter of the second signal is within the first no adjust region.

28. The method of claim 25, wherein the use of the first no adjust region includes relating the first adjustment to a past performance parameter of the second signal minus the first nominal level when a current performance parameter of the second signal is within the no adjust region and the past performance parameter of the second signal is outside the first no adjust region.

29. The method of claim 25, wherein the use of the first no adjust region includes relating the first adjustment to a past performance parameter minus a current performance parameter of the second signal when the current and the past performance parameters of the second signal are outside the first no adjust region.

30. The method of claim 18, wherein the performing of a second adjustment includes relating the second adjustment to the difference between a second nominal level minus a current performance parameter of the third signal.

31. The method of claim 18, wherein the performing of a second adjustment is based on a second no adjust region, where the second no adjust region is a region encompassing a second nominal level of the performance parameter of the third signal, the region having an a second upper bound and a second lower bound.

32. The meted of claim 31, the second adjustment is substantially zero when a current performance parameter of the third signal is within the second no adjust region.

33. The method of claim 31, wherein performing the second adjustment is performed in accordance with the following:

$\begin{array}{cc}\left(\underset{k=0}{\overset{N-1}{⩓<br><br>}}<br><br><br><br>\left({\mathrm{CP}}_m<br><br>\left(n-k\right)><br><br>A\right)\right)\bigwedge <br><br>\left(A\ge <br><br>{\mathrm{CP}}_m<br><br>\left(n-N\right)\right)\Rightarrow <br><br>\mathrm{\Delta <br><br>}<br><br><br><br>P_2=\left({\mathrm{CP}}_p-{\mathrm{CP}}_m<br><br>\left(n\right)\right)*W_N.& \end{array}$

34. The method of claim 31, wherein performing the second adjustment is performed in accordance with the following:

$\left(\underset{k=0}{\overset{N-1}{⩓<br><br>}}<br><br><br><br>\left({\mathrm{CP}}_m<br><br>\left(n-k\right)<<br><br>B\right)\right)\bigwedge <br><br>\left(B\le <br><br>{\mathrm{CP}}_m<br><br>\left(n-N\right)\right)\Rightarrow <br><br>\mathrm{\Delta <br><br>}<br><br><br><br>P_2=\left({\mathrm{CP}}_p-{\mathrm{CP}}_m<br><br>\left(n\right)\right)*W_N.$