Patent ID: 7215967
Filing Date: 2007-05-08
Classification: G01S,H04W

Abstract:
1. A method of expediting startup procedures of a Global Positioning System (GPS) receiver associated with a mobile terminal, the mobile terminal connected to a wireless telecommunications system having a Base Transceiver Station (BTS), the BTS having operational control of the GPS-equipped mobile terminal, the method comprising the steps of: positioning a number of reference GPS receivers throughout the wireless telecommunications system, each reference GPS receiver capable of providing assistance GPS data, including identity of visible GPS satellites and associated orbital parameters, clock corrections and differential corrections; sending a request from the GPS-equipped mobile terminal to the BTS for approximate navigational data; utilizing the BTS location as an initial position estimate for the GPS-equipped mobile terminal and as a criterion for selecting one of the number of reference GPS receivers nearest the GPS-equipped mobile terminal; utilizing a timing reference between a GPS clock signal and a frame number, wherein the timing reference comprises a correlation between the frame number and the GPS clock signal at the selected reference GPS receiver and broadcasting the correlation to the GPS-equipped mobile terminal; retrieving relevant GPS assistance data from the selected reference GPS receiver; the BTS sending navigational data, comprising the relevant assistance GPS data, to the GPS-equipped mobile terminal for estimating the current position of the GPS-equipped mobile terminal; and utilizing the navigational data to acquire GPS signals from optimally situated GPS satellites.