Patent ID: 8155654

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, comprising: notifying, from the mobile station to the radio base station, a data amount in a transmission buffer of the mobile station; determining, at the radio base station, a maximum allowable value that can be notified to the mobile station, in accordance with the data amount in the transmission buffer, which is notified from the mobile station; determining, at the radio base station, a first transmission value based upon consideration of available radio resources; calculating, at the radio base station, as a granted value to be notified to the mobile station, the smaller of the first transmission value and the maximum allowable value; notifying, from the radio base station to the mobile station, the granted value calculated at the radio base station, by using a transmission rate control channel; and transmitting, at the mobile station, the uplink user data, at a transmission rate corresponding to the granted value notified from the radio base station.