Patent ID: 6999767

Claim:
A method for controlling a hand-off of an MS (Mobile Station) for home zone service in a mobile telecommunications system, comprising the steps of: (a) establishing a call connection between said MS and a BTS (Base Transceiver Station) providing the home zone service, wherein a home zone pertaining to the home zone service is defined by a fixed network in which the MS is further registered for use; (b) requesting a BSC (Base Station Controller) to make the hand-off to a hand-off targeted BTS via said BTS; (c)(i) causing said BSC to receive a home zone information of said MS from an MSC (Mobile Switching Center) wherein the home zone information pertains to said home zone and includes a home zone list and a subscriber class of said MS; (c) (ii) causing said BSC to determine whether the hand-off targeted BTS belongs to the home zone using the home zone list; (d) (i) performing the hand-off of said MS to said hand-off targeted BTS if said hand-off targeted BTS belongs to the home zone; (d)(ii) determining whether said MS is registered to be used only in the home zone or not by retrieving the subscriber class when said hand-off targeted BTS does not belong to the home zone; (e) dropping said call connection if said hand-off targeted BTS does not belong to the home zone and if said MS is registered to be used only in the home zone service; and, (f) performing the hand-off of said MS to said hand-off targeted BTS if said hand-off targeted BTS does not belong to the home zone and said MS is registered to be used both in the home zone service and a non-home zone service.