A method for setting up/releasing by a user equipment (UE) a radio resource control (RRC) connection with an evolved node B (eNB) in a communication system is provided. The method includes detecting that traffic occurs. The method also includes that after detecting that the traffic occurs, determining a traffic type of the traffic The method further includes adaptively adjusting a timing point at which the UE releases a RRC connection between the eNB and the UE based on the traffic type.