Method and apparatus for adjusting a power control setpoint threshold in a wireless communication system

• US 6,084,904 A
• Filed: 07/25/1997
• Issued: 07/04/2000
• Est. Priority Date: 07/25/1997
• Status: Expired due to Term

• Current Assignee: Google Technology Holdings LLC (Alphabet Inc.)
• Original Assignee: Motorola, Inc. (Motorola Solutions, Inc.)
• Inventors: Wang, Michael Mao, Love, Robert T., Ling, Fuyun, Proctor, Lee Michael
• Primary Examiner(s): Chin, Stephen
• Assistant Examiner(s): Liu, Shuwang
• Application Number:
  US08/900,269
• Time in Patent Office: 1,075 Days
• Field of Search: 375/200, 375/206, 375/130, 375/140, 375/317, 375/148, 375/219, 370/342, 370/252, 370/335, 455/69, 455/522, 455/38.3, 455/423
• US Class Current: 375/130
• CPC Class Codes: H04B 1/1027 assessing signal quality or detecting noise/interference for the received signal
• CPC Class Codes: H04W 52/125 cascaded outer loop power control

Abstract

A method of adjusting a power control setpoint threshold (216) in a wireless communication system is provided. The method includes the steps of receiving at a receiver, a communication signal from a mobile communication unit to form a received communication signal, generating a first signal quality indicator (193) based on the received communication signal, generating a second signal quality indicator (194) based on the received communication signal, and generating an estimated signal-to-noise ratio (98). The method further includes setting a predetermined reference region (605) centered around a second signal quality indicator reference (206) where the second signal quality indicator reference (206) is related to the first signal quality indicator (193), and adjusting the power control setpoint threshold (216) based on a comparison between the second quality indicator (194) and the predetermined reference region (605).

Claims

1. In a code division multiple access wireless communication system, the system including a mobile communication unit, a method of adjusting a power control setpoint threshold, comprising the steps of:

receiving a communication signal from the mobile communication unit to form a received communication signal;

generating a first signal quality indicator based on the received communication signal;

generating a second signal quality indicator based on the received communication signal;

generating, an estimated signal-to-noise ratio;

setting a predetermined reference region centered around the second signal quality indicator reference where the second signal quality indicator reference is related to the first signal quality indicator; and

adjusting the power control setpoint threshold based on a comparison between the second quality indicator and the predetermined reference region.

2. The method according to claim 1, wherein the first signal quality indicator comprises frame erasure information.

3. The method according to claim 2, wherein the second signal quality indicator reference about which the reference region is centered, is variable based on a characteristic of the frame erasure information.

4. The method according to claim 3, wherein the characteristic of the frame erasure information further comprises a frame erasure rate.

5. The method according to claim 1, wherein the second quality indicator is selected from a group consisting of a symbol error rate indicator, a total metric and other quality indicators.

6. The method according to claim 1, wherein a power control command is generated based on the power control setpoint threshold and the estimated signal-to-noise ratio of at least one received symbol.

7. The method according to claim 1, wherein a power control command is generated based on the power control setpoint threshold and the estimated signal-to-noise ratio of symbols within a power control group.

8. The method according to claim 1, wherein the estimated signal-to-noise ratio is generated by a demodulator.

9. The method according to claim 1, wherein the first and second quality indicator is selected from amongst a plurality of such indicators obtained from a plurality of demodulated communication signals.

10. The method according to claim 9, wherein the first and second quality indicator is selected based on the best combined and weighted quality value.

11. The method according to claim 1, wherein the first signal quality indicator and the second signal quality indicator are generated at a base station.

12. The method according to claim 11, wherein the step of adjusting the power control setpoint threshold is performed at the base station.

13. The method according to claim 11, wherein the first signal quality indicator and the second signal quality indicator are transferred from the base station to a centralized controller.

14. The method according to claim 13, wherein the step of adjusting the power control setpoint threshold is performed at the centralized controller.

15. The method according to claim 14, wherein the power control setpoint threshold is transferred to the base station to generate the power control command.

16. The method according to claim 1, wherein the first signal quality indicator and the second signal quality indicator are generated from a decoder.

17. The method according to claim 16, wherein the decoder resides in either a base station or a centralized controller.

18. The method of claim 17, wherein the step of adjusting the power control setpoint threshold is performed at the base station, if the decoder resides in the base station.

19. The method of claim 17, wherein the step of adjusting the power control setpoint threshold is performed at the centralized controller, if the decoder resides in the centralized controller.

20. The method according to claim 19, further comprising the steps of:

transferring, by the centralized controller, the power control setpoint threshold to the base station; and

generating, at the base station, the power control command.

21. The method according to claim 19, further comprising the steps of:

generating, at the centralized controller, the power control command; and

transferring the power control command to the base station.

22. A controller responsive to a decoder comprising:

means for receiving a first signal quality indicator based on a decoded received communication signal;

means for receiving a second signal quality indicator based on the decoded received communication signal;

means for generating a second signal quality indicator reference where the second signal quality indicator reference is related to the first signal quality indicator;

means for setting a predetermined reference region centered around the second signal quality indicator reference; and

means for adjusting a power control setpoint threshold based on a comparison between the second signal quality indicator and the predetermined reference region.