Base station time calibration using position measurement data sent by mobile stations during regular position location sessions
First Claim
1. A method of calibrating base stations in a wireless telecommunications network to Global Positioning System (GPS) time, said method comprising:
- computing base station timing offsets from position measurement data obtained from one or more hybrid mobile stations during regular position location sessions, wherein position measurement data includes GPS pseudorange measurement data and position measurement data based on propagation delay for signals transmitted between the hybrid mobile stations and the base stations.
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Abstract
Base stations in a wireless telecommunications network are calibrated to GPS system time by using position measurement data obtained from one or more hybrid mobile stations during regular position location sessions. Therefore, the calibration data need not be obtained externally from a calibration instrument, and the calibration may occur on a continuous basis to compensate for any disturbances or drift in the base stations. Privacy concerns are alleviated by using regular position location sessions that occur only when the operator of the hybrid mobile station places or answers a wireless telephone call. In a preferred implementation, the network uses Code Division Multiple Access (CDMA), and the hybrid mobile stations may provide Advanced Forward Link Trilateration (AFLT) or GPS position location data to the network.
41 Citations
20 Claims
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1. A method of calibrating base stations in a wireless telecommunications network to Global Positioning System (GPS) time, said method comprising:
computing base station timing offsets from position measurement data obtained from one or more hybrid mobile stations during regular position location sessions, wherein position measurement data includes GPS pseudorange measurement data and position measurement data based on propagation delay for signals transmitted between the hybrid mobile stations and the base stations. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A method of calibrating base stations in a Code Division Multiple Access (CDMA) wireless telecommunications network to Global Positioning System (GPS) time, said method comprising:
computing base station offsets from position measurement data obtained from one or more hybrid mobile stations during regular position location sessions, wherein the position measurement data includes GPS code phase data expressed relative to mobile station system time. - View Dependent Claims (16, 17, 18, 19)
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20. A method of calibrating base stations in a Code Division Multiple Access (CDMA) wireless telecommunications network to Global Position System (GPS) time, said method comprising:
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computing base station timing offsets from position measurement data obtained from one or more hybrid mobile stations during regular position location sessions, wherein the position measurement data includes GPS pseudorange measurement data and Advanced Forward Link Trilateration (AFLT) position measurement data, wherein the base station calibration is performed on a substantially continuous basis to compensate for any disturbances in the base stations, wherein the collection of the position measurement data from the hybrid mobile stations occurs only when the hybrid mobile stations place or answer wireless telephone calls, and wherein the base stations provide GPS acquisition data to the hybrid mobile stations.
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Specification