Patent ID: 8804617

Claim:
A wireless transmission method, adapted for delivering multicast broadcast service (MBS) in a relay system, comprising: transmitting MBS data, at a base station, to at least a subordinate mobile station of the base station at a first time point; transmitting the MBS data, at the base station, to at least a subordinate relay node of the base station at the first time point or at a second time point, which is later than the first time point; deciding, at the base station and the at least a relay node at an upper hop level, whether to transmit a duplicate of the MBS data simultaneously with at least a relay node at a lower hop level when the at least a relay node at the lower hop level is scheduled to transmit the received MBS data at a time point later than the first time point; and using an indicator to indicate any two transmission being identical; wherein each one of mobile stations in the relay system is allowed to overhear MBS transmission from the base station or the at least a relay node, which do not have direct control over the mobile station or the mobile stations which overhear wherein such overhearing opportunities may be deemed as redundancies.