Patent ID: 8085785

Claim:
A mobile station performing packet communications with a base station, comprising: a reservation control signal generating unit configured to generate a reservation control signal for requesting an allocation of a transmission slot, based on control information transmitted in advance of a data packet; a reservation control signal transmission control unit configured to transmit to the base station the reservation control signal generated by the reservation control signal generating unit; and a data transmission unit configured to transmit data to the base station using the transmission slot allocated by the base station; wherein the reservation control signal generating unit generates and transmits a first reservation control signal including information about a data size of first data to be transmitted in a transmission period, the reservation control signal generating unit generates a second reservation control signal including information about a data size of second data to be transmitted, when the second data is generated after the first reservation control signal is transmitted, and the reservation control signal transmission control unit transmits the second reservation control signal at the end of the transmission period just before the data transmission unit completes transmitting the first data.