Patent ID: 8917650

Claim:
A method of transmitting within a wireless network comprising a base station, at least one terminal and at least one relay station, the method comprising: transmitting a downlink sub-frame from the base station, wherein the downlink sub-frame extends across a plurality of sub-carriers, the downlink sub-frame comprising: a first preamble for a terminal served directly by the base station, wherein at least part of the first preamble is coded with a code sequence, wherein the downlink sub-frame extends across a plurality of sub-carriers; a second preamble for a relay station, wherein the second preamble occupies a different position within the downlink sub-frame compared to the first preamble, wherein the second preamble does not include data for terminals served directly by the base station, wherein at least part of the second preamble is coded with a combination of the code sequence and a scrambling code; and a first guard period extending over a portion of the plurality of sub-carriers, wherein the portion of the plurality of sub-carriers is less than the entirety of the plurality of sub-carriers, the first guard period positioned between the first preamble and the second preamble for allowing the relay station to switch between a transmit operation and a receive operation.