Patent ID: 6804213
Filing Date: 2004-10-12
Classification: H04W

Abstract:
A cordless telephone system comprising at least a first transceiver station and a second transceiver station, said system being arranged such thata given call connection is carried on a channel pair, said channel pair consisting of an uplink channel from said second transceiver station to said first transceiver station and a downlink channel from said first transceiver station to said second transceiver station, said system furthermore comprising: a means for switching from a momentary call carrying channel pair to a new channel pair during a call connection, a means for determining interference strength values associated with one or more channel pairs that are available to said system for establishing call connections between said first and said second transceiver stations, said means being arranged to determine interference strength values during a call connection for one or more channel pairs other than the channel pair momentarily carrying the call connection, and a means for processing said interference strength values in order to determine a group of one or more candidate channel pairs that serve as candidate channel pairs to which a call connection can potentially be switched, where said means for switching is arranged such that, during a call connection between said first and second transceiver station, under a predetermined switching initiating condition, said first and second transceiver stations perform a fast switching procedure from the channel pair momentarily carrying the call connection to a different channel pair from among said group of candidate channels, wherein said first transceiver station is arranged to generate first interference data associated with the interference strength on each uplink channel for which a determination of interference strength values was performed, said second transceiver station is arranged to generate second interference data associated with the interference strength on each downlink channel for which a determination of interference strength values was performed, said processing means is arranged to collate the first and second interference data, and to process said collated data in order to determine said group of candidate channels.