The Research And Improvement Of Gateway Strategy On Ad Hoc Network

Ad Hoc network is a newly-style networks, and it can be flexibly deployed in almost any environment without the need of infrastructure based stations. Ascompared with traditional networks, Ad Hoc network has some characteristics such as autonomous, multi-hop routes and dynamic topology, and in which mobile node is not only a mobile terminal but also a router.Mobile IP is a simple and extensible mobility solution for global Internet and it can help mobile nodes being able to keep normal communications while roaming between different subnetworks, but not need to change IP address. Because of its extensibility, Mobile IP is applicable to global Internet, and so applying Mobile IP to Ad hoc networks which can achieve integration of Mobile IP and Ad Hoc network. Via this integration, mobile hosts which in Ad Hoc networks can enjoy tremendous services already exist on the Internet through Mobile IP, and for which Ad Hoc network is more adaptive to modern communication.In this thesis the Ad Hoc routing protocol AODV is used and modified to examine the interconnection between a mobile Ad Hoc network and the Internet by broadcasting gateway advertisement. For this purpose, Network Simulator 2 has been used. Moreover, the evaluation has been done according to three metrics: the bit rate, the packet loss and the end-to-end delay. The network performance is improved largely while it did not outperform through Mobile IP while switching gateways.Both Mobile IP and AODVPlus send broadcast advertisements periodically to keep the link of route, it will use up the resource of mobile Ad Hoc network. In this thesis, the architecture of mobile node has been modified to support multiple channels and multiple interfaces in AODVPlus, a distributive strategy of multiple channels has been simulated to analysis according to characteristic of AODVPlus. In some degree, the network performance is imporved, while the distributive strategy is the key to mulitple channels.