Wireless transmission method, base station, relay station and mobile station using the same

A base station, adapted for delivering multicast broadcast service (MBS) in a relay system, wherein,

• the base station is configured for transmitting MBS data to at least a subordinate mobile station of the base station at a first time point;
• the base station is configured for transmitting the MBS data 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;
• the base station is configured for deciding 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
• the base station is configured for using an indicator to indicate any two transmissions 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.

A relay station adapted for delivering multicast broadcast service (MBS) in a relay system, wherein,

• the relay station is configured for receiving MBS data from a base station or a relay station at an upper hop level in the relay system;
• the relay station is configured for transmitting the received MBS data, at a first time point, to at least a mobile station or at least a subordinate relay station thereof in the relay system;
• the relay station is configured for deciding whether to transmit a duplicate of the received 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;
• and
• the relay station is configured for using an indicator to indicate any two transmissions 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.