Controlling forward and reverse link traffic channel power

• US 8,116,253 B2
• Filed: 05/02/2008
• Issued: 02/14/2012
• Est. Priority Date: 10/08/2002
• Status: Expired due to Fees

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Anderson, Jon James
• Primary Examiner(s): Pwu, Jeffrey
• Assistant Examiner(s): Taha, Shaq
• Application Number:
  US12/114,377
• Publication Number:
  US 20080242339A1
• Time in Patent Office: 1,383 Days
• Field of Search: 370/318
• US Class Current: 370/318
• CPC Class Codes: H04B 7/18543 for adaptation of transmission parameters, e.g. power control for detecting or preventing errors in the information received H04L1/00
• CPC Class Codes: H04W 52/143 Downlink power control
• CPC Class Codes: H04W 52/16 Deriving transmission power values from another channel
• CPC Class Codes: H04W 52/20 using error rate
• CPC Class Codes: H04W 52/283 Power depending on the position of the mobile
• CPC Class Codes: H04W 52/48 during retransmission after error or non-acknowledgment

Abstract

Forward link transmission power to a user terminal in a wireless communications system having a plurality of beams is controlled by determining a baseline power level, P_baseline, from a received active pilot channel signal-to-noise ratio (SNR); determining a power margin, P_margin, from an identified interference susceptibility; determining a power level correction, P_correction, based on an identified quality of service metric (QSM); determining a fade correction factor, P_fade, based on a detected fade environment; and setting P_transmit based on P_baseline, P_margin, P_correction and P_fade. For example, P_transmit may be set to a power level that is substantially equal to the sum of P_baseline, P_margin, P_correction and P_fade. The determination of each of P_baseline, P_margin, P_correction and P_fade may be performed in independently running control loops or processes.

Claims

1. A method of controlling forward and reverse link channel transmission power, P_transmit, to and from a user terminal in a wireless communications system having a plurality of beams, comprising the steps of:

(a) receiving an in-use formatted message signal to noise ratio (SNR) of an active signal of interest;

(b) determining a baseline power level, P_baseline, from the received active formatted message SNR, wherein the determining step comprises calculating a transmit power level offset;

(c) identifying an interference susceptibility of the active signal of interest comprising the step of measuring a signal power of at least one adjacent signal at a receiver;

(d) transmitting a formatted interference message comprising segregating interference susceptibility into categories detected at the receiver;

(e) determining a power margin, P_margin, from the identified interference susceptibility;

(f) identifying a quality of service metric (QSM) associated with the active signal of interest;

(g) determining a power level correction factor, P_correction, based on the QSM;

(h) identifying a signal fade condition associated with the active signal of interest;

(j) determining a fade margin power level P_fade, based on the signal fade condition; and

(k) setting P_transmit based on P_baseline, P_margin, P_correction, and P_fade.

2. The method of claim 1 wherein the step of measuring signal power of adjacent signals comprises measuring frequency.

3. The method of claim 1 wherein the step of measuring signal power of adjacent signals comprises measuring bandwidth.

4. The method of claim 1 wherein the step of measuring signal power of adjacent signals comprises measuring location.

5. The method of claim 1 wherein the step of identifying a QSM comprises identifying a member from the group consisting of a filtered signal to noise ratio (SNR), a block error rate (BER), a symbol error rate (SER), a frame error rate (FER) and a combination of the SNR, the BER, the FER and the SER.

6. The method of claim 1 further comprising the step of lowering the interference susceptibility by increasing the channel transmit power, P_transmit.

7. The method of claim 1 further comprising the step of lowering the interference susceptibility by decreasing an interference power of the at least one adjacent signal.

8. The method of claim 1 further comprising the step of adjusting a data rate and bandwidth of the active signal of interest based on a type and a power of the at least one adjacent interfering signal.

9. The method of claim 8 wherein the formatted interference message comprises orthogonal and non-orthogonal noise.

10. The method of claim 8 wherein the formatted interference message comprises a narrow band and a wide band interferer.

11. The method of claim 1 wherein the step of determining a baseline power level, P_baseline, comprises averaging a history of the SNR of the active signal of interest.

12. The method of claim 1 wherein the step of determining a fade margin power level P_fade, comprises filtering the active signal of interest SNR.

13. A system for controlling forward and reverse link channel transmission power, P_transmit, to and from a user terminal in a wireless communications system having a plurality of beams, the system comprising:

means for receiving an in-use formatted message signal to noise ratio (SNR) of an active signal of interest;

means for determining a baseline power level, P_baseline, from the received active formatted message SNR, wherein the means for determining comprises a means for calculating a transmit power level offset;

means for identifying an interference susceptibility of the active signal of interest comprising a means for measuring a signal power of at least one adjacent signal at a receiver;

means for transmitting a formatted interference message comprising segregating interference susceptibility into categories detected at the receiver;

means for determining a power margin, P_margin, from the identified interference susceptibility;

means for identifying a quality of service metric (QSM) associated with the active signal of interest;

means for determining a power level correction factor, P_correction, based on the QSM;

means for identifying a signal fade condition associated with the active signal of interest;

means for determining a fade margin power level P_fade, based on the signal fade condition; and

means for setting P_transmit based on P_baseline, P_margin, P_correction, and P_fade.

14. The system of claim 13 wherein the means for measuring signal power of adjacent signals comprises a means for measuring frequency.

15. The system of claim 13 wherein the means for measuring signal power of adjacent signals comprises a means for measuring bandwidth.

16. The system of claim 13 wherein the means for measuring signal power of adjacent signals comprises a means for measuring location.

17. The system of claim 13 wherein the means for identifying a QSM comprises a means for identifying a member from the group consisting of a filtered signal to noise ratio (SNR), a block error rate (BER), a symbol error rate (SER), a frame error rate (FER) and a combination of the SNR, the BER, the FER and the SER.

18. The system of claim 13 further comprising a means for lowering the interference susceptibility by increasing the channel transmit power, P_transmit.

19. The system of claim 13 further comprising a means for lowering the interference susceptibility by decreasing an interference power of the at least one adjacent signal.

20. The system of claim 13 further comprising a means for adjusting a data rate and bandwidth of the active signal of interest based on a type and a power of the at least one adjacent interfering signal.

21. The system of claim 20 wherein the formatted interference message comprises orthogonal and non-orthogonal noise.

22. The system of claim 20 wherein the formatted interference message comprises a narrow band and a wide band interferer.

23. The system of claim 13 wherein the means for determining a baseline power level, P_baseline, comprises a means for averaging a history of the SNR of the active signal of interest.

24. The system of claim 13 wherein the means for determining a fade margin power level, P_fade, comprises a means for filtering the active signal of interest SNR.

25. A computer program product, comprising:

a non-transitory computer readable medium comprising;

code for causing forward and reverse link channel transmission power, P_transmit, to be controlled to and from a user terminal in a wireless communications system having a plurality of beams, the computer code comprising;

code for causing an in-use formatted message signal to noise ratio (SNR) to be received from an active signal of interest;

code for causing a baseline power level, P_baseline, to be determined from the received active formatted message SNR, further comprising a calculation of a transmit power level offset;

code for causing an interference susceptibility of the active signal of interest be identified further comprising a measurement of a signal power of at least one adjacent signal at a receiver;

code for causing a formatted interference message be transmitted comprising a segregation of the interference susceptibility into categories detected at the receiver;

code for causing a power margin, P_margin, to be determined from the identified interference susceptibility;

code for causing a quality of service metric (QSM) associated with the active signal of interest to be identified;

code for causing a power level correction factor, P_correction, based on the QSM to be determined

code for causing a signal fade condition associated with the active signal of interest to be identified;

code for causing a fade margin power level, P_fade, based on the signal fade condition to be determined; and

code for causing a P_transmit to be set based on P_baseline, P_margin, P_correction, and P_fade.

26. The computer program product of claim 25 wherein code for causing a measurement of signal power of adjacent signals comprises a measurement of frequency.

27. The computer program product of claim 25 wherein code for causing a measurement of signal power of adjacent signals comprises a measurement of bandwidth.

28. The computer program product of claim 25 wherein code for causing a measurement of signal power of adjacent signals comprises a measurement of location.

29. The computer program product of claim 25 wherein the code for causing a QSM be identified comprises an identification of a member from the group consisting of a filtered signal to noise ratio (SNR), a block error rate (BER), a symbol error rate (SER), a frame error rate (FER) and a combination of the SNR, the BER, the FER and the SER.

30. The computer program product of claim 25 further comprising code for causing the interference susceptibility be lowered by increasing the channel transmit power, P_transmit.

31. The computer program product of claim 25 further comprising code for causing of the interference susceptibility be lowered by a decrease of an interference power of the at least one adjacent signal.

32. The computer program product of claim 25 further comprising code for causing a data rate and bandwidth of the active signal of interest be adjusted based on a type and a power of the at least one adjacent interfering signal.

33. The computer program product of claim 32 wherein the formatted interference message comprises orthogonal and non-orthogonal noise.

34. The computer program product of claim 32 wherein the formatted interference message comprises a narrow band and a wide band interferer.

35. The computer program product of claim 25 wherein the code for causing a baseline power level, P_baseline, be determined comprises code for causing a history of the SNR of the active signal of interest be averaged.

36. The computer program product of claim 25 wherein the code for causing a fade margin power level P_fade, be determined comprises code for causing the active signal of interest SNR be filtered.