Method and apparatus for performing activation/deactivation of serving cell in wireless communication system supproting dual connectivity

A method for performing activation/deactivation of a serving cell by a User Equipment (UE) supporting a dual connectivity, the method comprising:

• receiving, from a master evolved Node B (MeNB), a Medium Access Control (MAC) control element (CE) including activation/deactivation indicators of serving cells (SCells) associated with the MeNB;
• receiving, from a secondary evolved Node B (SeNB), a MAC CE including activation/deactivation indicators of SCells associated with the SeNB;
• identifying activation/deactivation indicators corresponding to indexes for the SCells associated with the MeNB;
• controlling activation/deactivation statuses of the SCells associated with the MeNB based on the MAC CE received from the MeNB;
• identifying activation/deactivation indicators corresponding to indexes for the SCells associated with the SeNB;
• and
• controlling activation/deactivation statuses of the SCells associated with the SeNB based on the MAC CE received from the SeNB.

A method for operating activation/deactivation of a serving cell, by a User Equipment (UE), the method comprising:

• configuring dual connectivity with a master evolved NodeB (MeNB) and a secondary evoled NodeB (SeNB) for (RRC) connection;
• configuring a secondary serving cell (SCell) group of the MeNB and a SCell group of the SeNB;
• activating an SCell in the SCell group of the MeNB if an indicator of index of the SCell is set to 1 and deactivating the SCell in the SCell group of the MeNB if an indicator of index of the SCell is set to 0 by checking an activation/deactivation Medium Access Control (MAC) Control Element (CE) message transmitted from the MeNB;
• and
• activating an SCell in the SCell group of the SeNB if an indicator of index of the SCell is set to 1 and deactivating the SCell in the SCell group of the SeNB if an indicator of index of the SCell is set to 0 by checking an activation/deactivation MAC CE message transmitted from the SeNB.