An Efficient Geographic Multicast Protocol for Supporting Scalable Multicasting over Manet

In mobile ad hoc networks, it is challenging to implement efficient and scalable multicast because of multicast packet forwarding and difficulty in group membership management. To overcome this problem we propose an efficient geographic multicast protocol (EGMP).To achieve this a network wide zone based bidirectional tree is constructed. Position is determined by which the tree structure and route searching reduces efficiently. To further improve the protocol efficiency a concept called zone depth is used. The EGMP evaluates the scalability and the efficiency through simulations and quantitative analysis. Its simulation results demonstrates high packet delivery ratio, low control over head and multicast group joining delay. Thus EGMP is more efficient compared to scalable position based multicast (SPBM).Even though EGMP is more efficient, when the destination node moves it leads to loss of data. In order to avoid this loss we are implementing a new concept known as Bloom Filtering. Finally in this paper we compare SPBM with EGMP and EGMP with DOM based bloom filtering.