A Study Of Multi-path Routing Protocol For Mobile Ad Hoc Networks

With the development in computer and wireless communication technologies,mobile wireless networks are increasingly widespread used. The wireless Ad Hoc networks are received more and more attention due to their characters of no network administration and infrastructure.Wireless Ad Hoc networks owns some characteristics like self-organization, multi-hop and a frequently-changed topology. The uniqueness of Wireless Ad Hoc Network made it impossible to adopt the routing technologies utilized in traditional networks. So various routing protocols that are tailored to wireless Ad Hoc networks have been put up in recent years by researchers around the world. And the related analyses are being done from different aspects. Since nodes in the wireless Ad Hoc networks move freely and randomly, how to improve the route reliability becomes the central challenge in such dynamic wireless networks. We focus on the routing protocols and algorithms of Ad Hoc networks in this paper, and we chose the multi-path routing techniques as our main research point.Among wireless Ad Hoc routing protocols, one named Ad Hoc On-demand Distance Vector (AODV) has a better performance than others. In this paper, we gave a summary of Ad Hoc networks, including the definition, characteristics, applications and key-technologies of Ad Hoc networks at first. And then, we first introduced the backgrounds of the routing protocols for Ad Hoc network. Then some existing routing protocols were compared and researched infeatures and performance. At last, some basic concepts on Mobile Ad Hoc networks multipath extensions to Ad Hoc On-demand Distance Vector (AODV) routing protocol called AOMDV , were introduced. Only the path with the strongest aggregated signal strength is used for data transmission in the two modified protocol based on AOMDV. we verified and illustrated the correction of the two modified AOMDV we proposed through NS2 simulation. The results showed out that the two modified AOMDV didn't cause more routing overhead but performed better than AOMDV on metrics of packet delivery, average end-to-end delay and can provide better support for mobile communications especially in fast movement environment.