Research Of The Trust-based Routing Protocol Based On AOMDV In MANET

A mobile Ad hoc network (MANET) is a self-organised system comprised of mobile wireless nodes. With the popularity of personal communication networks, as well as needs of the military and the disaster relief, Mobile Ad hoc network (MANET) has been one of the hotspots of current research. Owing to multi-hop routing and absence of centralized administration in open environment, MANET is vulnerable to attack by malicious nodes. Routing protocol in the network communication occupies a very important position, so choosing a trusted path carefully can reduce the damage caused by malicious nodes. How to design a trusted routing protocol in MANET has become an important issue. Ad hoc on-demand multipath distance vector (AOMDV) routing protocol is a typical on-demand multipath routing protocol for Ad hoc networks, which extended from AODV. AOMDV routing protocol significantly reduces the control overhead and end-to-end delay, but it does not consider security problems. The security of AOMDV routing protocol needs furthe study.In order to decrease the hazards from malicious nodes, the authors incorporate the concept of trust to MANET and build a simple trust model to evaluate neighbours’behaviours-forwarding packets. Extended from AODV routing protocol and AOMDV routing protocol, a trust-based multipath routing protocol, Ad hoc on-demand trusted multipath distance vector (AOTMDV), is proposed for MANET. This protocol is able to discover multiple loop-free paths as candidates in one route discovery, which improves reliability of routings. These paths are evaluated by two aspects:hop counts and trust values. This two-dimensional evaluation provides a flexible and feasible approach to choose the shortest path from the candidates that meet the requirements of data packets for dependability or trust. Furthermore, the authors give a routing example in details to describe the procedures of route discovery and the differences among AODV, AOMDV and AOTDV.Finally, several experiments have been conducted to compare AODV、AOMDV、and AOTMDV. Experimental results show that AOTMDV improves packet delivery ratio, reduces the average end-to-end latency, and mitigates the impairment from black hole, grey hole and modification attacks. It has a very important theoretical and practical value.