Patent ID: 6909905

Claim:
A mobile communication system comprising: a mobile station and a base station connected via one or a plurality of radio channels for communication, the base station including traffic measuring means for measuring traffic of said one or a plurality of radio channels in the mobile communication system, rate setting means for changing a transmission bit rate, control means for determining the transmission bit rate based on the traffic measured by said traffic measuring means, and signal multiplexing means for transmitting to the mobile station control information containing information about the transmission bit rate determined by said control means; and the mobile station comprising communication means for communicating with the base station in accordance with said information about the transmission bit rate received from the base station, wherein the mobile station is configured to transmit a signal that requests the base station to decrease the transmission bit rate, when the traffic of one or plurality of radio channels in use is smaller than a predetermined value and a command to increase a transmit power beyond a maximum transmit power is received from the base station continuously over a predetermined period.