Research On Key Issues Of Mobile Peer-to-Peer Networks

There has the new application requirement for achieving mobile users's resources collaborating and sharing tasks through different mobile devices such as personal digital assistant and so on. So these bring a new demand for the academic research and industrial development of mobile P2P networks. This dissertation introduces the technology of mobile P2P networks from a full-scale vision, such as research background, present research situation and the classification of research work on key issues, etc. According to the classification of research work on key issues, the technology of mobile P2P networks is deep studied through the design of architecture, nodes cooperative incentive mechanism, resource sharing scheme and so on. Some innovative contributions of the dissertation are enumerated as follows:(1) Proposing a new mobile P2P routing algorithmRouting algorithm is the most important part of resource sharing scheme research. The dissertation proposes a routing discovery algorithm based on the restriction flooding and mobile Agents routing search. Moreover, in this dissertation the new improved ant colony routing selection algorithm is used based on the heat degree. Routing performance objects and methods resolving bursty routing problems are synthetically analyzed for routing maintenance algorithm. This algorithm performs well in controlling the route overhead, etc.(2) Proposing a fuzzy knowledge processing algorithm for route informationAn algorithm which can analyze and filter the valuable data from the fuzzy information carried by mobile Agents is proposed based on the routing algorithm mentioned above. Compared with the existing routing algorithms in mobile ad hoc networks which are based on mobile Agents and the routing algorithm, the results of this dissertation show the proposed algorithm can reduce the average end-to-end delay and routing overhead, and so on. It also can have the better adaptability to the variability and fuzziness of routing information which is caused by the mobility of mobile peers.(3) Proposing a cooperative incentive mechanism based on game theoryConsidering facing to the resource limitation and selfishness of mobile peers, this dissertation proposes a cooperative incentive mechanisms based on game theory. This dissertation describes and analyzes the resource allocation policy of cooperative incentive mechanism in detail. Besides, the existence of the steady Nash equilibrium in the game is also proven. The incentive mechanism can encourage the cooperation among the peers and increase forwarding ratio of the packet and so on.(4) Proposing a resource requesting and dispatching scheme among mobile peersThe resource requesting and dispatching scheme among mobile nodes design aprediction algorithm of resources based on reliability theory for resources' requestor. A multi-level model of resource dispatching has been put forward for resources' provider based on the queue theory. According to theory analyse and derivation, the prediction algorithm can increase success ratio of sharing resources' cooperation task and the resources dispatching model can significantly improve the service quality and so on.(5) Proposing an optimized policy of cooperative sharing Cache resourcesIn order to make full use mobile nodes' cooperative Cache resources effectively, a cooperative Cache resources replacement policy based on the pheromone is proposed, and a mathematical model and the derivation of choosing appropriate memory space as cooperative Cache resources is established. The new policy can significantly improve cooperative Cache resource utility. It also can promote the success ratio of resource obtainment from cooperation nodes and so on.The architecture of mobile P2P networks is designed and the prototype system of a practical mobile P2P application is implemented based on the project of computational transportation system. The design details of some of the key modules and issues are also provided in this dissertation.