A method for receiving a radio resource control (RRC) message by a user equipment (UE) is described. The method includes receiving an RRC connection reconfiguration message including mobility control information. In response to receiving the RRC connection reconfiguration message including mobility control information, a medium access control (MAC) entity of a secondary cell group (SCG) is released if any MAC entity of the SCG is established. In response to receiving the RRC connection reconfiguration message including mobility control information, a MAC entity of a master cell group (MCG) is reset.