Patent ID: 6879839

Claim:
A radio communication system comprising a base station and a mobile terminal, said base station transmitting a data signal to said mobile terminal through a forward channel and transmitting one of a first power control signal indicating the positive of a received signal from said mobile terminal and a second power control signal indicating the negative of said received signal in accordance with the positive or negative of said received signal, said mobile terminal transmitting the data signal to said base station through a first reverse channel indicating an existing traffic channel and a second reverse channel indicating a traffic channel added for data communication and controlling an operation to increase a transmission power of the data signal to be transmitted to said base station when said second power control signal is received; wherein said mobile terminal comprises: a receiving unit for receiving said first and second power control signals; a transmission power control unit for controlling a power of the transmission signal of said first and second reverse channels based on said first and second power control signals which are received by said receiving unit; and a transmission control unit for monitoring whether or not a value of said transmission power controlled by said transmission power control unit exceeds a predetermined maximum value, counting a number of the second power control signals sequentially received by said receiving unit when said transmission-power value has reached said maximum value, and transmitting the data signal to said base station only through said first reverse channel when said transmission-power value reaches said maximum value, and a counted value of the number of the second power control signals exceeds a predetermined threshold.