Patent ID: 6577611
Filing Date: 2003-06-10
Classification: H04W

Abstract:
A portable radio telephone for communication with base stations in a digital cellular radio telephone system employing transmission by a plurality of carrier frequencies in frames each consisting of a predetermined number of time slots, such that a set of communication channels occupying the same time slot is defined, one of the set of associated communication channels being on each of said plurality of carrier frequencies, andeach of which channels is a combination of a carrier frequency and a time slot, wherein the portable radio telephone comprises: a) processing means operative to select for the radio telephone a communication channel for communication to a base station, and b) means, in said processing means, for excluding from selection any communication channel in the set of associated communication channels occupying the same time slot as the channel on which an attempt at communication to a base station, on any one of said carrier frequencies, has been made and failed.