Granted Patent B2

US 7,598,908 · App. 11/950,823 · Granted Oct 6, 2009

Abstract

Claims (42)

1. A method of reducing interference in a GPS-equipped wireless device having a transmitter, the method comprising:

acquiring a GPS signal containing GPS data;

decoding the GPS data;

determining whether the GPS data is valid;

when the GPS data is not valid due to the interference, determining a transmit power level of the transmitter; and

when the transmit power level is not zero, reducing the transmit power level by one step.

2. The method of claim 1 , further comprising:

when the transmit power level is zero, reporting that there is no GPS signal and setting the mobile transmitter to normal operation.

3. The method of claim 1 , further comprising:

when the GPS data is valid, reporting the GPS data and setting the mobile transmitter to normal operation.

4. The method of claim 1 , wherein the interference is caused by E911 service.

5. The method of claim 1 , further comprising:

tracking and aggregating power control commands during an interval when the transmit power level was lowered for GPS measurement purposes; and

retransmitting at a transmit power level that will result in successful reception of a transmission at a base station.

6. The method of claim 1 , wherein one step comprises one dB.

7. An apparatus for reducing interference in a wireless device, the apparatus comprising:

a GPS receiver for acquiring a GPS signal containing GPS data, decoding the GPS data, and determining whether the GPS data is valid;

means for determining transmit power of the transmitter when the GPS data is not valid due to the interference; and

means for reducing the transmit power level by one step when the transmit power is not zero.

8. The apparatus of claim 7 , further comprising:

means for reporting that there is no GPS signal and setting the mobile transmitter to normal operation when the transmit power is zero.

9. The apparatus of claim 7 , further comprising:

means for reporting the GPS data and setting the mobile transmitter to normal operation when the GPS data is valid.

10. The apparatus of claim 7 , wherein the interference is caused By E911 service.

11. The apparatus of claim 7 , further comprising:

means for tracking and aggregating power control commands during an interval when the transmit power level was lowered for GPS measurement purposes; and

means for retransmitting at a transmit power level that will result in successful reception of a transmission at a base station.

12. The apparatus of claim 7 , wherein one step comprises one dB.

13. A method of reducing interference in a GPS-equipped wireless device having a transmitter, the method comprising:

acquiring a GPS signal containing GPS data;

decoding the GPS data;

determining whether the GPS data is valid;

determining a transmit power level of the transmitter when the GPS data is not valid due to interference caused by E911 service;

reducing the transmit power level by at least one step when the transmit power level is not zero; and

reporting that there is no GPS signal and setting the mobile transmitter to normal operation when the transmit power level is zero.

14. The method of claim 13 , wherein one step comprises one dB.

15. The method of claim 13 , further comprising:

reporting the GPS data and setting the mobile transmitter to normal operation when the GPS data is valid.

16. The method of claim 15 , further comprising:

tracking and aggregating power control command data during an interval when the transmit power level was lowered for GPS measurement purposes;

storing the data as one parameter in a database; and

retransmitting at a transmit power level that will result in successful reception of a transmission at a base station.

Assignments (10)