Patent ID: 7623842

Claim:
A wireless communication system, comprising: one or more first position determining equipment (PDE), associated with a first wireless communication carrier, to time stamp a first call request received from a first emergency calling mobile unit (MU); one or more second position determining equipment (PDE), associated with a second wireless communication carrier, to time stamp the first call request received from the first emergency calling mobile unit (MU); a first mobile positioning center (MPC) to receive the time stamped first call requests from the first and second position determining equipment (PDE) and to determine a first approximate location of the first emergency-calling MU using the time stamped first call requests received from said first and second position determining equipment (PDE); a first mobile switching center (MSC) associated with said first wireless communication carrier; and a second mobile switching center (MSC) associated with said second wireless communication carrier, wherein said first mobile positioning center (MPC) receives one of said time stamped first call requests from the first position determining equipment (PDE) by way of said first mobile switching center (MSC) and one of said time stamped first call requests from the second position determining equipment (PDE) by way of said second mobile switching center (MSC).