Base station time calibration using position measurement data sent by mobile stations during regular position location sessions

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:

• 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.