CALL ROUTING IN MOBILE TELEPHONE SYSTEMS

摘要

A method and apparatus for providing continuous and accurate location information pertaining to a mobile telephone subscriber wherein a temporary location is utilized. Upon entry to a visited system the mobile subscriber either transmits a registration access or a call access. If the mobile subscriber sends a registration access, the visited system acknowledges the registration, records the mobile subscriber's presence and signals the mobile subscriber's home system of the mobile's presence. Receipt of the mobile's location from the visited system causes the mobile subscriber's home system to update its location data for that particular mobile. If the mobile subscriber initiates a call access from within the visited system without registering within the visited system, the visited system allocates a record for the mobile indicating within the record that it has not received a registration from the mobile and transmits to the home system a temporary location signal. The home system, upon receipt of the temporary location stores the location without deleting the existing location data for the mobile subscriber. The temporary location data is deleted upon the conclusion of the mobile subscriber's call from within the visited system. The temporary location data is used by the mobile subscriber's home system to effectuate the routing of calls for the mobile subscriber.