Method of controlling transmitting power of femto cell for interference control

PURPOSE: A transmission power control method for controlling the interference of a femto cell is provided to effectively control the transmission power of femto cells in heterogeneous network environment. CONSTITUTION: The transmission power of femto cells is established as an initial transmission power(S210). Simultaneous inequalities are established between an SIR(Signal to Interference Ratio) respectively received by user terminals and an SIR satisfied with service requirements of each terminal(S220). When all inequalities are satisfied, currently controlled transmission power is maintained(S230,S240). The transmission power control of the femto cells is stopped.