Efficient Multicasting In Manet Using RSGM Technique

The challenges in designing a scalable and robust multicast routing protocol in a mobile ad hoc network (MANET) due to the difficulty in group membership management, multicast packet forwarding, and the maintenance of multicast structure over the dynamic network topology for a large group size or network size. To use a novel Robust and Scalable Geographic Multicast Protocol (RSGM) which exhibit several virtual architectures. Specially, scalable and efficient group membership management is performed through a virtual-zone-based structure, and the location service for group members is integrated with the membership management. The stateless virtual-treebased structures significantly reduce the tree management overhead, support more efficient transmissions, and make the transmissions much more robust to dynamics. Geographic forwarding is used to achieve further scalability and robustness. To overcome flooding of the source information throughout the network, an efficient source tracking mechanism is designed. Furthermore, we handle the empty-zone problem faced by most zone-based routing protocols. We have studied the protocol performance by performing both quantitative analysis and extensive simulations. Our results demonstrate that RSGM can scale to a large group size and a large network size, and can more efficiently support multiple multicast groups in the network. Compared to other protocols ODMRP and SPBM, RSGM achieves a significantly higher delivery ratio under all circumstances, with different moving speeds, node densities, group sizes, number of groups, and network sizes. RSGM also has the minimum control overhead and joining delay. Keywords— Multicast routing, geographic multicast, mobile computing, wireless networks, mobile ad hoc networks, geographic routing, location, scalable, robust