Patent ID: 8654744

Claim:
A radio communication system for high-speed packet transmission on an uplink and a downlink between a base station and a mobile station, in which said base station comprises: a first transmission processing unit which transmits a downlink packet transmission notification signal to the mobile station and a second transmission processing unit which transmits a corresponding downlink packet to the mobile station after a predetermined time after the transmission of the downlink packet transmission notification signal; and said mobile station comprises: a reception unit which, upon receiving the downlink packet transmission notification signal from said base station directed to said mobile station, receives the corresponding downlink packet, a first deciding unit which, for each transmission time unit of first channel of the uplink, determines a power to be used in the transmission time unit according to a number of downlink packet transmission notification signals directed to said mobile station which have been received in a first predetermined time interval prior to the transmission time unit; a second deciding unit which determines a transmission rate of the first channel based on the power to be used; and a transmission processing unit which transmits an uplink packet by the first channel by using the determined transmission rate after the determination of the transmission rate of the first channel and transmits a reception result notification signal of the corresponding downlink packet by a second channel of the uplink; wherein said first deciding unit considers the remaining power obtained by subtracting a required transmission power of said reception result notification signal from a maximum power of said mobile station as the power to be used for said first channel when the number of receptions of the downlink packet transmission notification signal directed to said mobile station, which are received in said first predetermined time interval, is larger than a first predetermined threshold value.