The present invention relates to a method for performing terminal cooperative transmission through direct link communication between a source terminal that requests terminal cooperation and a cooperative terminal that performs the terminal cooperative transmission with the source terminal in a wireless access system, and the method comprises the steps of allowing the source terminal to transmit a terminal cooperation request message for requesting the terminal cooperative transmission to a base station, allowing the base station to transmit control information for establishing a direct link between the source terminal and the cooperative terminal to the source terminal, and allowing the source terminal to establish a direct communication link with the cooperative terminal, on the basis of the received control information, wherein the control information contains dedicated random access channel (RACH) allocation information for synchronization between the source terminal and the cooperative terminal and for channel measurement, and dedicated random access channel (RACH) preamble sequence information.