Patent ID: 6810252
Filing Date: 2004-10-26
Classification: H04W

Abstract:
A method for detecting a hand-off target frequency of a mobile station (MS) in a CDMA communication system, comprising the steps of:(a)transmitting a pilot strength measurement message (PSMM) from said MS, through at least one base transceiver station (BTS), to a base station controller (BSC), said BSC having an active set containing a list of BTSs communicating with said MS; (b)causing said BSC to determine based on said PSMM whether said MS is located in a border of said BTS when the active set is revised or whether a forward radio communication channel of said MS is in bad state; (c)causing said BSC to command said MS to detect said hand-off target frequency when said MS is located in said border of said BTS or when said forward radio communication channel is in bad state; (d)causing said MS to report a list of target BTSs that provides said hand-off target frequency to said BSC and causing said BSC to command said MS to stop said detection when location of said MS changes or the forward communication channel improves while detecting said hand-off target frequency from said BTS; (e)causing said BSC to perform an inter-frequency hand-off if frequency resources of the target BFSs reported bv said MS are available, otherwise causing said MS to perform the inter-frequency handoff to all target BTSs; and (f) causing said MS to stop said detection.