Patent ID: 8547921

Claim:
A method for transmitting a preamble in a network supporting a relay, the method comprising: transmitting a first preamble through a downlink access zone, the first preamble being for establishing synchronization with at least one of a mobile station and relay stations divided into an odd-hop relay station and an even-hop relay station based upon a number of hops with the base station; and transmitting a second preamble through a downlink relay zone, the second preamble including supplemental information for accurately establishing synchronization with at least one of the mobile station and the relay stations, wherein the odd-hop relay station and the even-hop relay station transmit a third preamble to the mobile station or a subordinate relay station, the third preamble being used to establish synchronization with the odd-hop relay station and the even-hop relay station at a same time point where the first preamble is being transmitted.