A METHOD OF PERFORMING HANDOVER AND CONTROLLING THEREOF IN A MOBILE COMMUNICATION SYSTEM

摘要

A method of controlling handover of a user equipment in a first base station connected with the user equipment in a mobile communication system is disclosed. The first base station transmits state information to a second base station after determining handover to the second base station, wherein the state information includes at least one of information related to a connection setup state between the user equipment and the first base station and information related to a data transmission and reception state.The first base station transmits action information to the user equipment, the action information being related to action to be performed by the user equipment after the user equipment performs handover. The information related to the connection setup state includes information as to whether the user equipment is in an uplink synchronized state or an uplink non-synchronization state before performing handover.