Abstract

This research aims at proposing an improvement to On Demand Multicast Routing Protocol (ODMRP) called as Feedback ODMRP (FB-ODMRP). ODMRP is a popular multicast routing protocol designed for ad hoc networks with mobile hosts. Its efficiency, simplicity and robustness to mobility render it one of the most widely used routing protocols in MANETs. In ODMRP, the robustness is achieved using periodic route refreshing wherein group membership and multicast mesh are established and updated by the source on fixed refresh intervals and thus such route refresh interval is of the utmost importance to ODMRP’s performance. However, robustness comes at the expense of high control overhead incurred to the network. If small route refresh interval values are used, fresh routes and membership information can be achieved at the expense of incurring more control packets and increasing probability of packet collisions and congestion whereas the large refresh values are used, the protocol cannot keep up with network varying dynamics resulting route breakages and packet failure. In this research, the proposed variation of ODMRP makes the route refresh interval variable adapted to feedback information achieved from receivers of the multicast group. Through extensive simulations, it is observed that FB-ODMRP performs well over the range of scenarios and incurs less control overhead compared to original ODMRP while maintaining packet delivery ratio comparable that of the original ODMRP.

Keywords:

Control overhead, feedback information, Join Query, ODMRP, refresh interval,

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