Patent ID: 8260309

Claim:
A transmission rate control method in which a radio base station controls a transmission rate of uplink user data to be transmitted from a mobile station, determining, at the radio base station, a first granted value in consideration of available radio resources, when it is determined that a granted value to be notified to the mobile station is larger than the current granted value assigned to the mobile station; determining, at the radio base station, a maximum granted value that can be notified to the mobile station, in accordance with a successfully received transmission rate at which the uplink user data is transmitted from the mobile station to the radio base station; calculating, at the radio base station, as a second granted value to be notified to the mobile station, the second granted value is not more than the maximum granted value; notifying, from the radio base station to the mobile station, a smaller one of the first granted value and the second granted value, by using a transmission rate control channel; and transmitting, from the mobile station, the uplink user data, at the transmission rate corresponding to the granted value notified from the radio base station.