Patent ID: 8036179

Claim:
A method for transmitting multicast data in a WiMax/WiBro relay system, comprising: transmitting, by User Equipments (UEs), carrier-interference-noise ratios to their corresponding Relays; selecting, by a Multicast modulation and coding mode decision module of each Relay, a minimum value among the carrier-interference-noise ratios received from the corresponding UEs; determining a modulation and coding mode according to the selected minimum value; transmitting, by a multicast modulation and coding mode report module of each Relay, the modulation and coding mode to a Base Station (BS); selecting, by a multicast modulation and coding mode selection module of the BS, according to the multicast modulation and coding modes from different Relays, a multicast modulation and coding mode with a highest rate as a final modulation and coding mode for multicast data on an access link; transmitting the final modulation and coding mode to the Relays; and transmitting, by an access link multicast data transmitting module of the BS and access link multicast data transmitting modules of the Relays, data via the access link with the final modulation and coding mode determined by the BS.