A method and a user equipment (UE) for processing data in a communication system are discussed. The method according to an embodiment includes receiving a deactivate bearer context request message; deleting a bearer context identified by a bearer identity in the deactivate bearer context request message; and if a cause code in the deactivate bearer context request message indicates that reactivation is requested, stopping a session management back-off timer associated with a previously-established data connection if the session management back-off timer is running. The session management back-off timer is a timer starting if a session management back-off time value is received at the UE and. The previously-established data connection is associated with an access point name (APN). The method further includes re-initiating a packet data network (PDU) connectivity procedure for the APN after stopping the session management back-off timer.