Patent ID: 7885678

Claim:
A Mobile Station (MS) in a wireless communication system, comprising: a power controller for acquiring a last transmit power value P Tx,CL — last in a closed loop power control mode, a path loss value L OL — init estimated at the MS, a latest Noise and Interference (NI) value NI OL — init received from a Base Station (BS), a required Carrier to Interference and Noise Ratio value (CINR value) C/N CL — last for a last Modulation and Coding Scheme (MCS) level in the closed loop power control mode, and a repetition factor R CL — last according to the last MCS level, when a power control mode is changed from a closed loop power control to an open loop power control, calculating a power compensation value Offset_SS perSS using the acquired values, and determining a transmit power level P according to the open loop power control using the power compensation value; and a transmitter for adjusting a transmit power of an Uplink (UL) signal according to the determined transmit power level P.