A mobile communication method according to the present invention includes the steps of: (A) activating, at the radio base station (eNB), a first timer, upon transmission of a downlink data signal to the mobile station (UE) operating in a continuous reception cycle; (B) transmitting, from the radio base station (eNB) to the mobile station (UE), a change instruction instructing the mobile station (UE) to change a reception cycle of the mobile station (UE) from the continuous reception cycle to a first discontinuous reception cycle, and releasing the uplink dedicated resources, when the first timer expires with no downlink data signal transmitted after the activation of the first timer; and (C) changing, at the mobile station (UE), the reception cycle of the mobile station (UE) from the continuous reception cycle to the first discontinuous reception cycle, and releasing the uplink dedicated resources, in response to the received change instruction.