Method for updating area in wireless communication system, and device therefor

A second Mobility Management Entity (MME) performing a Tracking Area Update (TAU) with an MME change in a wireless communication system, the second MME comprising:

• a transmitter and a receiver;
• and
• a processor, operatively coupled to the transmitter and the receiver,
• wherein the processor is configured to:
• control the transmitter to transmit a Context Request message to a first MME during the TAU procedure;
• control the receiver to receive a Context Response message from the first MME in response to the Context Request message;
• and
• when the second MME receives information that there are downlink data buffered in a Serving Gateway (S-GW) through the Context Response message, perform an evolved terrestrial radio access network (E-UTRAN) Radio Access Bearer setup procedure in order to deliver the downlink data buffered in the S-GW even when a Downlink Data Notification (DDN) message is not received from the S-GW.