A method of protecting location privacy of a mobile station when the mobile station enters a network is disclosed. A method of supporting location privacy comprises the steps of transmitting a ranging code for performing initial ranging; and receiving a message including temporary station identifier after transmitting a ranging request message including MAC address of a mobile station. In this case, the temporary station identifier is used to provide security of a media access control (MAC) address or mapping information of the MAC address and station identifier, wherein the MAC address is to identify a mobile station within a base station.