Cluster communications are necessary in Mobile Ad hoc Networks (MANETs). Multicast is an efficient methodology for implementing cluster communications. However, it is difficult to implement efficient and scalable multicast in MANET because of the problem in group membership management and multicast packet forwarding over a dynamic topology. We propose a unique Economical Geographic Multicast Protocol (EGMP). EGMP uses a virtual-zone-based structure to implement scalable and efficient cluster membership management. A networkwide zone-based mostly bidirectional tree is constructed to attain additional efficient membership management and multicast delivery. The position information is employed to guide the zone structure building, multicast tree construction, and multicast packet forwarding, that efficiently reduces the overhead for route searching and tree structure maintenance. Several strategies have been proposed to any improve the potency of the protocol, as an example, introducing the concept of zone depth for building an optimal tree structure and integrating the situation search of group members with the hierarchical group membership management. Finally, we design a theme to handle empty zone downside faced by most routing protocols employing a zone structure. The scalability and therefore the potency of EGMP are evaluated through simulations and quantitative analysis. Our simulation results demonstrate that EGMP has high packet delivery ratio, and low management overhead and multicast cluster joining delay beneath all check situations, and is scalable to each group size and network size. Compared to Scalable Position-Based Multicast (SPBM) [CHECK END OF SENTENCE], EGMP has significantly lower control overhead, information transmission overhead, and multicast group joining delay.
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