APPARATUS AND METHOD FOR CONTROLLING SECONDARY CELL UPLINK SYNCHRONIZATION

摘要

PURPOSE: An apparatus controlling secondary cell uplink synchronization and a method thereof are provided to correspond to a process of receiving a physical downlink control channel command, thereby transferring a first status regarding synchronization of SCell to a second status which does not regard synchronization of the SCell. CONSTITUTION: An SCell deactivation command is received by a MAC CE(Control Element)(601). The timeAlignmentTimer of UE for the SCell is not operated. The SCell activation command is received by the MAC CE(602). The timeAlignmentTimer of UE for the SCell is not operated. The SCell activation command is received by the MAC CE(603). The timeAlignmentTimer of UE for the SCell is operated. The SCell deactivation command is received by the MAC CE. The timeAlignmentTimer of UE for the SCell is operated. [Reference numerals] (AA) State 1 : inactivated and UL-desynchronized SCell; (BB) State 4 : inactivated and UL-synchronized SCell; (CC) State 2 : activated and UL-desynchronized SCell; (DD) State 3 : activated and UL-synchronized SCell