A mobile communication method according to the present invention includes the steps of: determining to change a reception cycle of a downlink data signal in the mobile station, from a continuous reception cycle to a discontinuous reception cycle; releasing the uplink dedicated resources being allocated to the mobile station (UE), in response to a result of the determination; and establishing uplink or downlink synchronization between the radio base station (eNB) and the mobile station (UE), and setting up the uplink dedicated resources, when transmission of an uplink data signal or a downlink data signal is to be resumed.