Patent ID: 6230018
Filing Date: 2001-05-08
Classification: G01S,H04W

Abstract:
A process in a mobile communication network, comprising:determining an expected time difference of arrival (TDOA) at a known location for signals of at least three base station pairs of the network;determining a measured TDOA for each of said base station pairs at said known location;determining an average measured TDOA for each of the base station pairs at said known location for a period of time;determining a correction factor for each base station pair constituting the difference between the expected and average measured TDOAs;determining a measured TDOA at a location of a mobile for each of said base station pairs;for each of said base station pairs, if a TDOA at the location of the mobile differs from a corresponding TDOA at the known location by less than a predetermined amount, applying a corresponding correction factor to said measured TDOA to yield a corrected TDOA; anddetermining a location using said corrected TDOAs.