Feng Mei-yu, Cheng Sheng, Zhang Xu, Ding Wei

Reliable Multicast Transport in Ad hoc Networks

Beijing University (China)

In Ad hoc networks, the inherent wireless channel impairment makes the scalability of multicast group degrade drastically. In literature, the conventional Reed-Solomon FEC (Forward Error Correction)-based scheme and the receiver-initiated NACK (Negative ACKnowledgement)-based mechanism are most famous techniques to achieve reliable transport of multicast in wired networks. While the computation complexity makes FEC inappropriate for software implementation in resource-limited wireless device. NACK mechanism in wired networks can not perform well in Ad hoc networks without any change. In this paper, focusing on reliable multicast transport in Ad hoc networks(RMTAH), we propose a new packet lever redundancy scheme names as PDA (Packet Dispersal Algorithm) to mitigate loss in wireless link and ARM (Active Retransmission Mechanism) for Ad hoc networks to relieve from the problem of NACK implosion. Simulations show that reliability of transport is improved greatly while transport overhead is moderate to be accepted.