Patent ID: 8619695

Claim:
A method of, at a terminal, performing a ranging procedure with respect to a base station in a mobile communication system in which a legacy system and an advanced system coexist, the method comprising: receiving a secondary super frame header (S-SFH) from the base station; determining whether the mobile communication system supports the legacy system; acquiring ranging channel information for performing initial ranging, handover ranging and periodic ranging from the S-SFH if the mobile communication system supports the legacy system; and performing at least one of the initial ranging, the handover ranging and the periodic ranging with respect to the base station using the ranging channel information, wherein the terminal receives the S-SFH via a first zone supporting the advanced system in a frame, and the ranging channel is allocated to a second zone supporting the legacy system in the frame, and wherein the terminal transmits ranging codes allocated to the terminal to the base station via the ranging channel of the second zone and, if the terminal does not receive a ranging ACK message from the base station via the first zone, the terminal retransmits the ranging codes to the base station via the ranging channel of the second zone.