Patent ID: 8520585

Claim:
A method in a terminal device for multicasting information in a communication network, the method comprising: enabling the terminal device to serve as an originator terminal device for multicast operation; transmitting multicast protocol data units utilizing a multicast address to a plurality of destination terminal devices; receiving, in response to the transmitting, an acknowledgment protocol data unit via a responder destination terminal device of the plurality of destination terminal devices; determining whether the transmitted multicast protocol data units are successfully received by the plurality of destination terminal devices based on the received acknowledgment protocol data unit; retransmitting those of the transmitted multicast protocol data units, which based on the determining, unsuccessfully received at the plurality of destination terminal devices, wherein the retransmission by the terminal device is based on information received from the responder destination terminal device; and receiving a supplemental acknowledgment protocol data unit from a destination terminal device of the plurality of destination terminal devices exclusive of the responder destination terminal device, wherein each of the acknowledgement protocol data unit and the supplemental acknowledgment protocol data unit are received utilizing the multicast address.