Patent ID: 8559982

Claim:
A method for determining the location of a user equipment (UE) unit operating within the coverage area of a base transceiver station (BTS) in a radio access network, said UE unit transmitting a periodic ranging code in an incoming signal received on an uplink channel, comprising: at said BTS, monitoring the incoming signal received from said UE unit over a first antenna and a second antenna; identifying the signal as a particular call and detecting said ranging code received in the signal; measuring a first and a second time of arrival (TOA) from said ranging code received at said first and second antennae, respectively; generating a first function representing a first plurality of possible positions of the UE unit based on the first TOA and a second function representing a second plurality of possible positions of the UE unit based on the second TOA; determining the geographical coordinates of said UE unit using said first and second functions; appending the geographical coordinates to the particular call; and transmitting the particular call with the geographical coordinates to a service provider relevant to the s articular call and the geographical coordinates.