The Research And Design Of MANET BT Content Distribution System Based On Dynamic Cluster

In order to make efficient content distribution,the dynamic moving nodes in MANET environment can not totally copy the rules of the BT protocol in the popular P2P network.The thesis makes an in-depth study on characteristics,working mechanisms,protocols and implementation of content distribution system in MANET environment.It introduces the concept of dynamic clusters,and optimizes the routing protocol.A set of schemes has been designed to enhance the BT protocol of P2P techniques,which can adapt to MANET dynamic changing environment better.The thesis designs a BT content distribution prototype based on dynamic cluster structure in MANET environment,and simulates and makes tests.The simulation results show that the MANET BT content distribution system based on dynamic cluster works well in the performance such as scalability,routing efficiency and overhead.At the same time,the improved content distribution system has reduced the average file download time and improved the coorperation of network nodes.Main work and study of this thesis are the following:Research and compare the similarities and differences between MANET and P2P networks such as characteristics,architecture and main routing protocols; analyze the various limitation of inter-node communication in the MANET environment;study the feasibility of introducing P2P techniques into MANET.Analyze BitTorrent protocol in depth,including working mechanism,core algorithms such as fragment and node selections,etc;analyze the mechanism of BitTorrent protocol,as well as necessary modifications when migrate it to MANET environment.Introduce a new routing protocol based on dynamic cluster;propose the corresponding algorithm in cluster head election and self-healing routing strategy.Propose an improved MANET BT protocol to match MANET environment; propose corresponding resource locating methods according to the logic structure of dynamic cluster;provide new message structure,cooperative node selection mechanism and the fragment selection strategy.Design a BT content distribution prototype in MANET environment;carry out simulation through NS2;analyze testing results and verify the system performance.