Patent ID: 7899486

Claim:
A Mobile Station (MS) for use in a wireless communication system according to a Time Division Duplexing-Orthogonal Frequency Division Multiple Access (TDD-OFDMA) scheme, the MS comprising: a power controller that, when a power control mode is changed from a closed loop power control to an open loop power control, acquires 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 an 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, a repetition factor R CL — last , according to the last MCS level, calculates a power compensation value Offset_SS perSS using the acquired values, and determines a transmit power level P, according to the open loop power control, using the power compensation value; and a transmit modem for adjusting a transmit power of an UpLink (UL) signal according to the determined transmit power level P, wherein the transmit modem comprises a channel coding block, a modulation block, and a Radio Frequency (RF) transmit block.