Patent ID: 8606192

Claim:
An apparatus for power control in a mobile communication system, the apparatus comprising: a target Signal-to-Interference Ratio (SIR) determiner for flexibly changing a fixed target SIR upon a sudden target SIR decrease following, a previous increase, wherein the target SIR determiner decreases the target SIR by a plurality of steps, wherein a step size of a first step of the plurality of steps is larger than a down-step size of the target SIR, and wherein a step size of each of subsequent steps of the plurality of steps is smaller than the first step of the plurality of steps, and wherein the target SIR determiner detects a down-step size determination ratio of a step size determination ratio corresponding to a down step of a remaining target SIR from an increased target SIR to the normal target SIR, and sets a flexible down step size by multiplying the target SIR down-step size and the detected down-step size determination ratio.