Method of using available mobile communication terminal as relay station

A method of using an available mobile communication terminal as a relay station, applied to a plurality of base stations (BS) and a plurality of mobile communication terminals, each of the mobile communication terminals having a function of acting as a relay station, wherein, when one mobile communication terminal of the mobile communication terminals performs communication and learns that signals received from a first base station are in a state of being weak, the steps of the method among the first base station and the mobile communication terminals comprise:

• sending a relay request from the one mobile communication terminal to the first base station for requesting the first base station to search for at least one other available mobile communication terminal of the mobile communication terminals that have communication signals stronger than the signals learned to be weak within a coverage area of the first base station, and requesting the first base station to send out a notice message;
• after the one mobile communication terminal receives the notice message from the first base station, automatically selecting an available mobile communication terminal from the at least one other available mobile communication terminal as a first relay station within the coverage area of the first base station, and sending a register request to the first relay station for connecting the first relay station to the one mobile communication terminal;
• and
• after the first relay station accepts the register request from the one mobile communication terminal, the one mobile communication terminal performing communication by connecting to the first base station through the first relay station.