A terminal in wireless system and ranging method thereof

The present invention relates to a device and its ranging method for a mobile communication system. For efficient ranging implementations of the present invention, the terminal, by the terminal only drive the transmission and reception device for until it receives a response of the ranging response message for it after transmitting the predetermined code for ranging to the access point or a certain period of time in the case of non-reception processing a ranging response message, and that shall not receive a ranging response message from the transceiver. And adjusts the transmission power, timing, frequency offset when the ranging response message is received according to the code transmission terminal based on the message. According to the present invention may greatly reduce the process load on the device for the processing of the ranging response message, it is possible to implement an efficient ranging accordingly. Mobile Internet, ranging, radio resources, CDMA