Patent ID: 7200127

Claim:
An apparatus for controlling uplink transmitting power in a CDMA mobile station, comprising: a channel estimator detecting a power magnitude and/or a phase of a specific channel of received downlink signals based on the received downlink signals; a speed estimator estimating a moving speed of the CDMA mobile station based on the detected power magnitude and/or phase; a step adjuster changing the size of a power control step based on the estimated moving speed; a demodulator extracting a power control command contained in the received downlink signals; a power level controller adjusting a power level of transmitting signals by the changed power control step size according to the extracted power control command; and a measuring means measuring a reliability of the extracted power control command, wherein said power level controller derives a weighting factor from the measured reliability, multiplies the changed power control step size by the derived weighting factor, and increments or decrements the power level of transmitting signals by the multiplied step size.