Research And Implementation Of Automatic Route Shortening Protocol ESDSR Based On Expected Transmission Times Of Links

Ad Hoc network is a kind of wireless network, which does not depend on fixed infrastructure. In Ad Hoc networks, the mobile nodes are both hosts and routers. It is a completely self-organizing and adaptive new network constituted by wireless nodes. The research and applications of Ad Hoc networks have a greatly strategic significance in the field of military, rescue and distance education. It shows its superiority, efficiency, robustness and survivability. However there are issues in Ad Hoc network, for example, the limited energy of mobile nodes, limited bandwidth and security issues. So it is difficult to design the route protocol of Ad Hoc networks.In this thesis, we investigate DSR routing protocol deeply and serve the deficiencies of automatic route shortening based on hops-count of DSR protocol including selecting poor quality transmission and easily broken path, and the wipe edge nodes, which will result in the performance degradation to the network. To solve these problems, this thesis proposes a new route protocol named automatic route shortening based on expected transmission times of links, abbreviated ESDSR. Based on DSR routing protocol, we add hello message to establish neighbor table to calculate the successful transmission ratio between nodes, in order to compute the expected transmission times required by packet transmission. During the process of automatic route shortening in ESDSR route protocol, it not only requests the least number of hops, but also the least transmission times of data packets. The automatic route shortening mechanism of new route protocol is a guarantee to select high-quality links with better robustness and higher efficiency, which can promote the whole performance of the networks.This thesis describes the ESDSR route protocol in detail, and we implement the ESDSR based on the expanded module of NS2network simulation software, then compare the experimental results of ESDSR and DSR in terms of packets delivery ratio and end-to-end delay. It can be seen that ESDSR route protocol performs better than DSR route protocol on these two aspects.