Patent ID: 8811257

Claim:
A mobile communication system comprising a first base station and a relay station that relays a radio signal between the first base station and a mobile station, wherein the first base station is configured to (i) transmit, in a first frame, a first radio signal into which transfer information to be transmitted to the mobile station through the relay station is encoded, and (ii) transmit, in a second frame, a second radio signal into which first multicast information to be received by a plurality of nodes is encoded, at a transmission timing synchronized with that of a neighbor base station, and the relay station is configured to be able to receive the first radio signal, and is also configured such that (i) when the transfer information encoded into the first radio signal is unicast information addressed to the mobile station, the relay station decodes the unicast information from the first radio signal and transmits a third radio signal into which the unicast information is encoded to the mobile station, and (ii) when the transfer information encoded into the first radio signal is second multicast information having a same content as that of the first multicast information, the relay station is able to omit decoding the second multicast information from the first radio signal.