A Directional Routing Protocol For Mobile Ad Hoc Networks

The mobile ad hoc networks are receiving more and more attention for its flexibility and practicality in recent years. Since every node in ad hoc networks acts as both a host and a router, routing protocol is a main research issue in the Ad hoc Wireless networks. Various routing protocols have been put up in recent years by researchers around the world, and the related performance analysis and evaluation of academic studies have become hot.In this dissertation, we proposed hybird routing protocol called AODV-DFR. It not only combines proactive and reactive routing features, but also borrows from Geo-Routing the concept of greedy forwarding. If the source node has no route to the destination, it floods a route request to find a path. Once the destination receives the route request, it returns a route reply to the source, and starts to advertise its existence and position to the neighbors by broadcasting a periodic beacon. Periodically, the nodes that have received the beacon, will in turn broadcast to their neighbors, and so on. When a link failure on the original path occurs due to a node moving or other reasons, the upstream node can immediately establish another path based on the direction.The author selected three typical Ad hoc routing protocols as a reference, AODV. GPSR and ADV, make the performance analysis and evaluation of UDP and TCP traffic by simulation. To make analysis and evaluation of the AODV-DFR routing protocol from different perspectives, the author also carried out the simulation via a variety of mobile model. Extensive simulations show that AODV-DFR can significantly improve the network performance.