A radio terminal, in a transmission opportunity of each of plural kinds of allocation request schemes for a first uplink radio resource, the transmission opportunity being periodically allocated from the base station, estimates timings that the first uplink radio resource is allocated from the base station when an allocation request of a corresponding allocation request scheme is transmitted, based on a cycle of the transmission opportunity and a turnaround time of the allocation request scheme, and transmits the allocation request to the base station in a transmission opportunity selected by the estimated timing.