A mobile communication terminal (UE) comprises: a transmitting unit (213,
211) which transmits a signal via a radio resource allocated to the
mobile communication terminal (UE) for the transmission of a prescribed
control signal; and a signal selector unit (214) which, when upstream
traffic occurs, selects a reservation request signal as the signal to be
transmitted via the allocated radio resource wherein, when the mobile
communication terminal (UE) is in a standby state, the reservation
request signal is transmitted from the mobile communication terminal (UE)
to the base station (BS) by using the radio resource allocated to the
mobile communication terminal (UE) for the transmission of the prescribed
control information.