Patent ID: 6400952
Filing Date: 2002-06-04
Classification: H04W

Abstract:
A method for an idle state handoff of a mobile telephone between base stations having different frequency assignments in a cellular system, said method comprising the steps of:(a) transmitting information by a current base station to said mobile telephone regarding a frequency assignment of each of a plurality of neighboring base stations and a list of the neighboring base stations having a channel connected to said mobile telephone; (b) detecting a pilot signal from one of said plurality of neighboring base station by said mobile telephone; (c) determining whether the pilot signal detected from said one of said neighboring base stations is included in the list of said neighboring base stations; (d) recognizing that a handoff has failed if said neighboring base station from which said pilot signal is detected is not included in the list of said neighboring base stations; (e) determining whether a detected pilot signal is a dummy pilot signal by referring to the frequency assignment information if said detected neighboring base station is included in the list of said neighboring base stations; (f) deciding a frequency which corresponds to said detected neighboring base station to perform a handoff based on the frequency assignment information, if the detected pilot signal is a dummy pilot signal; and (g) detecting a paging channel from the decided handoff frequency.