ADJUSTING REPEATER GAINS BASED UPON RECEIVED DOWNLINK POWER LEVEL

• US 20130077502A1
• Filed: 09/23/2011
• Published: 03/28/2013
• Est. Priority Date: 09/23/2011
• Status: Active Grant

• Current Assignee: Qualcomm, Inc.
• Original Assignee: Qualcomm, Inc.
• Inventors: Gainey, Kenneth M., Gore, Dhananjay Ashok, Proctor, James Arthur Jr.
• Granted Patent: US 8,937,874 B2
• Time in Patent Office: Days
• US Class Current: 370/252
• CPC Class Codes: H04B 7/15578 by gain adjustment

Abstract

A method of controlling gains within a repeater may include determining a power control set point value which controls a transmit power of a mobile station (MS), and receiving a downlink signal from a base station transceiver system (BTS). The method may further include measuring a power of the received downlink signal, and computing a power level of a signal expected at the uplink of the repeater, wherein the computing is based on the measured downlink power and the power control set point value. Finally, the method may further include adjusting a gain of at least one amplifier based on the computed power level. An apparatus for controlling gains in a repeater may include a baseband processor for performing the above method.

Claims

1. A method of controlling gains within a repeater, comprising:

determining a power control set point value which controls a transmit power of a mobile station (MS);

receiving a downlink signal from a base station transceiver system (BTS);

measuring a power of the received downlink signal;

computing a power level of a signal expected at the uplink of the repeater, wherein the computing is based on the measured downlink power and the power control set point value; and

adjusting a gain of at least one amplifier based on the computed power level.

2. The method of claim 1, wherein determining the power control set point value further comprises at least one of reading a value provided in a control channel, retrieving a value stored in memory, reading a message provided in a data channel, and receiving the value from a simple message service (SMS) message.

3. The method of claim 2, wherein retrieving a value stored in memory further comprises:

receiving the power control set point value from an external configuration unit.

4. The method of claim 1, wherein the adjusting further comprises changing a gain of an amplifier in an uplink channel of the repeater.

5. The method of claim 4, wherein the gain of the amplifier in the uplink channel is set to reduce uplink noise at the BTS which is contributed by the repeater.

6. The method of claim 1, wherein the adjusting further comprises changing a gain of an amplifier in a downlink channel of the repeater.

7. The method of claim 6, wherein the gain of the amplifier in the downlink channel is set to reduce a dynamic range of a received signal which is provided to an analog-to-digital converter.

8. The method of claim 1, wherein computing the power level is based upon at least one power control set point value used by the MS which is associated with a wireless standard.

9. The method of claim 8, wherein the wireless standard includes IS-2000, UMTS, CDMA2000, and/or LTE.

10. The method of claim 1, wherein the repeater is a frequency division duplex (FDD) digital baseband interference cancellation repeater.

11. The method of claim 1, wherein measuring a downlink power further comprises measuring a Received Signal Strength Indicator (RSSI).

12. The method of claim 1, wherein measuring the power of the received downlink signal further comprises:

performing interference cancellation on a combined signal to remove a leakage signal; and

computing the power level of the received downlink signal after interference cancellation.

13. An interference cancellation repeater which controls gains based on measuring the downlink power received from a base station, comprising:

a first transceiver coupled to a donor antenna;

a second transceiver coupled to a serving antenna; and

a baseband processor coupled to the first transceiver and the second transceiver, the baseband processor being configured to;

determine a power control set point value which controls a transmit power of a mobile station (MS),

receive a downlink signal from a base station transceiver system (BTS),

measure a power of the received downlink signal,

compute a power level of a signal expected at an uplink of the interference cancellation repeater, wherein the computing is based on the measured downlink power and the power control set point value, and

adjust a gain of at least one amplifier based on the computed power level.

14. The interference cancellation repeater of claim 13, wherein the baseband processor is further configured to read a value provided in a control channel, retrieve a value stored in memory, read a message provided in a data channel, and/or receive the value from a simple message service (SMS) message.

15. The interference cancellation repeater of claim 14, wherein the baseband processor is further configured to receive the power control set point value from an external configuration unit.

16. The interference cancellation repeater of claim 13, wherein the baseband processor is further configured to adjust the gain by changing a gain of an amplifier in an uplink channel of the interference cancellation repeater.

17. The interference cancellation repeater of claim 16, wherein the gain of the amplifier in the uplink channel is set to reduce uplink noise at the BTS which is contributed by the interference cancellation repeater.

18. The interference cancellation repeater of claim 13, wherein the baseband processor is further configured to adjust the gain by changing a gain of an amplifier in a downlink channel of the interference cancellation repeater.

19. The interference cancellation repeater of claim 18, wherein the gain of the amplifier in the downlink channel is set to reduce a dynamic range of a received signal which is provided to an analog-to-digital converter.

20. The interference cancellation repeater of claim 13, wherein the baseband processor is further configured to compute the power level based upon at least one power control set point value used by the MS which is associated with a wireless standard.

21. The interference cancellation repeater of claim 20, wherein the wireless standard includes IS-2000, UMTS, CDMA2000, and/or LTE.

22. The interference cancellation repeater of claim 13, wherein the interference cancellation repeater is a frequency division duplex (FDD) digital baseband interference cancellation repeater.

23. The interference cancellation repeater of claim 13, wherein the baseband processor is configured to measure a downlink power by computing a Received Signal Strength Indicator (RSSI).

24. The interference cancellation repeater of claim 13, wherein the baseband processor is further configured to:

perform interference cancellation on a combined signal to remove a leakage signal; and

compute the power level of the received downlink signal after interference cancellation.

25. An interference cancellation repeater which controls gains based on measuring a downlink power received from a base station, comprising:

means for determining a power control set point value which controls a transmit power of a mobile station (MS);

means for receiving a downlink signal from a base station transceiver system (BTS);

means for measuring a power of the received downlink signal;

means for computing a power level of a signal expected at an uplink of the interference cancellation repeater, wherein the computing is based on the measured downlink power and the power control set point value; and

means for adjusting a gain of at least one amplifier based on the computed power level.

26. The interference cancellation repeater of claim 25, wherein determining the power control set point value further comprises means for at least one of reading a value provided in a control channel, reading a preprogramed value, and receiving the value from a simple message service (SMS) message from the BTS.

27. The interference cancellation repeater of claim 25, wherein the adjusting further comprises means for changing the gain of an amplifier in an uplink channel of the interference cancellation repeater.

28. The interference cancellation repeater of claim 27, wherein the gain of the amplifier in the uplink channel is set to reduce uplink noise at the BTS which is contributed by the interference cancellation repeater.

29. The interference cancellation repeater of claim 25, wherein the adjusting further comprises means for changing the gain of an amplifier in a downlink channel of the interference cancellation repeater.

30. The interference cancellation repeater of claim 29, wherein the gain of the amplifier in the downlink channel is set to reduce a dynamic range of a received signal which is provided to an analog-to-digital converter.

31. The interference cancellation repeater of claim 25, wherein computing the power level is based upon at least one power control set point value used by the MS which is associated with a wireless standard.

32. The interference cancellation repeater of claim 25, wherein the power control set point value may be provided by an external configuration unit.

33. A non-transitory machine-readable medium comprising instructions, which, when executed by a machine, cause the machine to perform operations, the instructions comprising:

instructions to determine a power control set point value which controls a transmit power of a mobile station (MS);

instructions to receive a downlink signal from a base station transceiver system (BTS);

instructions to measure a power of the received downlink signal;

instructions to compute a power level of a signal expected at an uplink of a repeater, wherein the computing is based on the measured downlink power and the power control set point value; and

instructions to adjust a gain of at least one amplifier based on the computed power level.

34. The non-transitory machine-readable medium of claim 33, further comprising instructions to determine the power control set point value by at least one of reading a value provided in a control channel, reading a preprogramed value, and receiving the value from a simple message service (SMS) message from the BTS.

35. The non-transitory machine-readable medium of claim 33, further comprising instructions to adjust a gain by changing a gain of an amplifier in an uplink channel of the interference cancellation repeater.

36. The non-transitory machine-readable medium of claim 35, wherein the gain of the amplifier in the uplink channel is set to reduce uplink noise at the BTS which is contributed by the interference cancellation repeater.

37. The non-transitory machine-readable medium of claim 33, further comprising instructions to adjust the gain by changing a gain of an amplifier in a downlink channel of the interference cancellation repeater.

38. The non-transitory machine-readable medium of claim 37, wherein the gain of the amplifier in the downlink channel is set to reduce a dynamic range of a received signal which is provided to an analog-to-digital converter.

39. The non-transitory machine-readable medium of claim 33, further comprising instructions to compute the power level based upon at least one power control set point value used by the MS which is associated with a wireless standard.