Patent ID: 8116795

Claim:
A data transmission timing control system for controlling the timing of data transmission from a mobile station to a base station, wherein said mobile station comprises: means for transmitting a transmission permission request signal to said base station at a transmission timing represented by the sum of a periodic reference timing and an offset value; means for, if a transmission permission signal transmitted from said base station in response to the reception by said base station of said transmission permission request signal is not received, retransmitting said transmission permission request signal repeatedly while changing the transmission timing until said transmission permission signal is received; and means for, if said transmission permission signal is received, transmitting data at the transmission timing that was used immediately before said transmission permission signal was received, wherein a change in the transmission timing is determined depending on the radius of an area covered by said base station, the transmitted electric power at said base station of a control signal transmitted from said base station, the received electric power at said mobile station of the control signal, and the number of times that said transmission permission request signal is transmitted.