Patent ID: 6741858
Filing Date: 2004-05-25
Classification: H04W

Abstract:
A method of changing a telecommunication channel in a mobile communication system for a given mobile station, which mobile station has a connection in progress, and the connection is provided with at least a channel on a radio connection between the mobile station and a base station system and a telecommunication channel between the base station system and a mobile services switching centre, and wherein the connection is further provided with a signalling channel between the base station system and the mobile services switching centre, said method comprising:transmitting a handover message from a base station system to a mobile services switching centre handling the call, said handover message indicating for the mobile services switching centre a new telecommunication channel for said connection between the mobile services switching centre and the base station system, putting at said mobile services switching centre said new telecommunication channel indicated by the handover message into use for the connection between the mobile services switching centre and the base station system, and connecting at the base station system the channel of the radio connection used by the connection to the new telecommunication channel such that the channel of the radio connection remains unchanged irrespective of the change of the telecommunication channel between the base station system and the mobile services switching centre whereby the new telecommunication channel indicated by the handover message is put into use between the mobile services switching centre and the base station system without changing the signalling channel.