| Mobile Ad hoc Networks (MANETs) are composed of mobile nodes (MN), which can communicates with each other and moves freely in the network. A route may be constituted by several hops of wirless links between the nodes, without any surports of infrastructure. Each MN is not only a communication terminal, but also a router in the network. Without any aid of infrastructure, an effiecent and dynamic communication system can provide convenient communication services freely, especially in emergency, disaster and military environment.Ad hoc networks are different from any other predominant communication systems in the past. The relevant key technology has made great progress through the efforts of several years. But the nodes' mobility, the provisionality of the network, the limited power, the instability of wirless link and the characteristics such as no center make them difficult to be used in practice. There are a lot of difficult technology problem need to be improved and solved.Many organizations in the world are devoted to studying MANETs. IETF has established MANETs work group, which is responsible to research the feasibility of the key technology and the standardization work. The research about MANETs has involved every layer of the OSI model. At present, the research direction mainly focuses on the wirless access technology, routing algorithm, broadcast routing, address allocation, power management, QoS, security problem, and problems in the transport layer, etc. This dissertation takes attention to the autoconfiguration of the node address of the Ad hoc network layer. According to the autoconfiguration of node address, the dissertation separately discussed the address configuration technology based on virtual backbone, the handoff of leaf node in virtual backbone, the address configuration technology based on the genetic mechanism, and also the adaptability technology of the network macroscopical topology changes. The main content and innovation point follows:1. Briefly introduced of the history of Ad hoc networks, then analysed the characristics of Ad hoc networks, the main hot spots, application future, development trend, and also expatiated the gist, the innovation of this dissertation.2. Generally described the status quo of the address autoconfiguration technology of Ad hoc networks, and intruduced the main technic scheme, besides, the analyzing of the characteristics of this technology and the comparison of their performance were also mentioned. Then the disadvantages of the existing technology were pointed out.3. Briefly narrated the Ad hoc virtual backbone technology, brought up the address two allocation schemes based on the virtual backbone, which included the scheme based on the flooding mechanism and the predistribution mechanism, and provided the simulation results, too.4. Took researches in the handoff of leaf node in virtual backbone, and analyzed the problems of the address changes, the route destroying, and the communication maintenance, which would be faced when the leaf node's handoff in the virtual... |
