Patent ID: 7995551

Claim:
A mobile station in a code division multiple access system continuously transmitting uncompressed frames in a normal mode, and intermittently transmitting compressed frames in a compressed mode, the mobile station comprising: a receiving unit configured to receive a compressed downlink frame in a compressed mode and transmission power control information transmitted from a base station, the compressed downlink frame generated in a base station and provided with an idle period formed by compressing a downlink frame interleaved in bit units, by dividing the downlink frame interleaved and compressed into a front portion and a rear portion, and by arranging the front portion and the rear portion such that the front portion includes a front edge of a frame window and that the rear portion includes a rear edge of the frame window, and the transmission power control information indicating an increase or a decrease in uplink transmission power; a monitoring unit configured to monitor a frequency component of another frequency carrier during the idle period of the compressed downlink frame; a compressing unit configured to generate a compressed uplink frame, by compressing an uplink frame in the compressed mode; and an adjusting unit configured to enable to adjust uplink transmission power of an uncompressed uplink frame and the compressed uplink frame, by increasing or decreasing the uplink transmission power with a first uplink transmission power control step size in the normal mode, and by increasing or decreasing the uplink transmission power with plural uplink transmission power control step sizes, including at least a second uplink transmission power control step size larger than the first uplink transmission power control step size, in the compressed mode, based on the transmission power control information received.