The location determination service 64 receives an identifier (typically, its assigned phone number or other identifying code) of the cellular telephone 50 making the call from the cellular call processor 62. Before forwarding the call to an appropriate emergency agency 80, 82, the call processor 62 interacts with a location determination service 64 in accordance with the present invention. When a user makes an emergency call, such as a 911 call, RF signals from the cellular telephone 50 are received by a cellular tower 60 and forwarded to a cellular call processor or router 62. The position sensing system 52 includes a GPS receiver 54 and a two-way pager 56. 2, a cellular telephone 50, in accordance with one aspect of the present invention, has a position sensing system 52 associated with it. G01S5/009- Transmission of differential positioning data to mobileĪs shown in FIG.G01S5/0009- Transmission of position information to remote stations.G01S5/00- Position-fixing by co-ordinating two or more direction or position line determinations Position-fixing by co-ordinating two or more distance determinations.G01S2205/008- Transmission of position information to remote stations using a mobile telephone network.G01S2205/006- Transmission of position information to remote stations for emergency situations.G01S2205/001- Transmission of position information to remote stations.G01S2205/00- Position-fixing by co-ordinating two or more direction or position line determinations Position-fixing by co-ordinating two or more distance determinations.G01S19/14- Receivers specially adapted for specific applications.
G01S19/01- Satellite radio beacon positioning systems transmitting time-stamped messages, e.g.G01S19/00- Satellite radio beacon positioning systems Determining position, velocity or attitude using signals transmitted by such systems.