Satellite-positioning-system tracking device and method for determining a position of the same

A method of providing location-based services for a mobile station, wherein the mobile station comprises charging and tracking modules adapted to be disengagably coupled together, wherein the tracking module comprises (i) tracking circuitry for determining at least one position of the tracking module a satellite positioning system, and (ii) a chargeable source for supplying power to the tracking circuitry when disengaged from the charging module, and wherein the charging module is operable to charge the chargeable source when the charging module is coupled to the tracking module, the method comprising in combination:

• sending from tracker module to a global user-plane center a request for assistance data, wherein the global user-plane center comprises a database containing information generating the assistance data as a function of a position estimate for the tracking module,
• generating at the global user-plane center the assistance data, wherein the assistance data corresponds to a position estimate for the tracking module;
• and
• sending to the tracking module the assistance data.

An system comprising:

• a mobile station comprising:
• charging and tracking modules adapted to be disengagably coupled together, wherein the tracking module comprises (i) tracking circuitry for determining at least one position of the tracking module using a satellite positioning system, and (ii) a chargeable source for supplying power to the tracking circuitry when disengaged from the charging module, and wherein the charging module is operable to charge the chargeable source when the charging module is coupled to the tracking module;
• and
• memory for storing the at least one position of the tracking module, wherein the tracking module is operable to provide from the memory the at least one position;
• a global user-plane center for storing the at least one position received from the mobile station;
• and
• a requestor for sending a request to track the tracking module and for receiving from the global user-plane center the at least one position responsive to the request to track the tracking module.