DMAODV: A MAODV-Based Multipath Routing Algorithm

The MAODV (Multicast Ad hoc On-demand Vector routing protocol)shows a smooth performance in light load ad hoc networks. However, packets transmission ratio will decrease continuously with the increasingly scale of multicast group. In this paper we discussed the impact of attacks on MAODV protocol. Based on these analyses, we proposed a routing protocol DMAODV (Distensible Multicast Ad Hoc On Demand) which is based on MAODV. It adds new feature on flooding message control, put forward a kind of "Self restrain flood" to suppress the MAODV GRPH and RREQ broadcast traffic. We made full use of the broadcast feature of wireless medium, and allow all nodes in the network send multicast packets. We analyzed the influence of nodes´ moving on routing. The simulattion with OPNET shows that the speed of packets transmission will increase and delay will decrease in DMAODV, and finally. The results justify that this protocol has better performance, less control overhead and higher scalability.