APPARATUS AND METHOD FOR SWITCHING CALL IN MOBILE COMMUNICATION SYSTEM

摘要

The present invention relates to a method for switching a call in a user equipment (UE) which supports a voice call continuity (VCC) method in a mobile communication system which includes: a step of detecting the necessity of voice call switching from a first access network to a second access network while transmitting/receiving voice data in the first access network through an existing bearer which is configured with an opponent UE; a step of performing setup operation for new bearer setup operation with the second access network; and a step of transmitting/receiving voice data with the opponent UE in the first access network through the existing bearer until a predetermined time point and transmitting/receiving voice data with the opponent UE in the second access network through the new bearer. [Reference numerals] (AA) Second user (remote end); (BB) First user data control unit; (CC) Second user data control unit; (DD) First access network; (EE) Second access network; (FF) First user (VCC UE)