The Research And Improvement Of On-demand Routing Protocol In Ad Hoc Network

A mobile ad hoc network is a multi-hop temporary autonomous system of mobile nodes equipped with wireless transmitter-receiver set. The most significant difference from other network is that nodes in ad hoc network can forward packets and communicate through many nodes' forwarding. Nodes harmonize each other through layered network protocol and distributed algorithm, to realize the network automatic organization and the movement. Therefore, the goal of routing protocol in ad hoc network is fast, accurate, highly effective, and good extensible capability. As a special wireless network without any fixed network infrastructure, it has extensive application prospect in military and civilian field. It has been a research focus in the present network research.This paper first introduced the background knowledge of ad hoc network and the key technique, network architecture, configuration of channel, system of protocols of WLAN. AODV routing protocol is chosen for our task after analyzing and comparing many routing protocols of Ad Hoc Network. In chapter 3, we introduce the elements of arithmetic, table structure, packet format and basic operation of arithmetic of the traditional AODV routing protocol. In chapter 4, the traditional AODV routing protocol is studied deeply, and we found that the performance of ad hoc network dropped when the mobile nodes moved relatively in the linear topology structure. The causation for the drop of performance is that the routing control packets and users' data packets are transmitted on different speed. We suggest a novel approach to solve this problem with SNR threshold. We also found that the nodes in ad hoc network broadcast the RREQ for discovering the new route. It will...