Patent ID: 7761112

Claim:
A power controlling method for controlling uplink power in a mobile communication system, the power controlling method comprising: estimating, by a base station, average Noise and Interference (NI) of a current frame based on signals received in the current frame, and setting the estimated average NI as a first average NI; averaging, by the base station, NIs of previous frames within a section corresponding to a setting size, the previous frames excluding the current frame, and calculating a second average NI; comparing, by the base station, the first average NI and the second average NI; increasing, by the base station, the first average NI to compensate the first average NI when the first average NI is less than the second average NI; broadcasting, by the base station, the compensated first average NI to subscriber stations in a corresponding cell; and broadcasting, by the base station, the first average NI without compensating the first average NI to the subscriber stations in the corresponding cell when the first average NI is greater than the second average NI, wherein the subscriber stations determine transmission power for transmitting a signal to an uplink based on the broadcasted first average NI.