Patent ID: 8359056

Claim:
A transmission rate control method for controlling a transmission rate of uplink user data transmitted from a mobile station via an enhanced dedicated physical data channel, comprising: determining, at a radio network controller, that a mobile station transmitting the enhanced dedicated physical data channel to only a first cell shifts to a soft handover state and transmits the enhanced dedicated physical data channel to the first cell and a second cell; notifying, from the radio network controller to the mobile station, by a soft handover setting request, relative transmission rate control channel decoding information for decoding a relative transmission rate control channel for the uplink user data to be transmitted by the second cell, to the mobile station based on the determination; decoding, at the mobile station, the relative transmission rate control channel for the uplink user data to be transmitted from the second cell, based on the relative transmission rate control channel decoding information; and controlling, at the mobile station, the transmission rate of the uplink user data based on a relative transmission rate for the uplink user data which is notified by the decoded relative transmission rate control channel.