Method and device for cell granularity reporting in wireless communication system

A user equipment (UE) for performing cell granularity reporting in an idle state in a wireless communication system, the UE comprising:

• a radio frequency (RF) unit configured to transmit and receive a wireless signal;
• and
• a processor configured to:
• control the RF unit to receive a cell granularity reporting configuration including timer information from a network;
• drive a timer based on the timer information;
• determine whether the timer expires, when the UE detects that a cell in which the UE is camping is changed;
• and
• control the RF unit to transmit cell change information to the network, when the timer expires,
• wherein the cell granularity reporting configuration includes an indication regarding whether to receive a multimedia broadcast and multicast service (MBMS), and
• when the indication regarding whether an MBMS is received is activated, the UE does not perform the cell granularity reporting unless the UE receives MBMS data.