Research On Content Distribution Mechanism Of MP2P Networks

With the gradual improvement in the performance of mobile terminal equipment, mobilenetwork has been undergoing a rapid development. MP2P as the product of peer-to-peernetwork and mobile computing, is free from fixed base station and provides a newdevelopment direction for the mobile network. MP2P, in line with its predecessor, thetraditional P2P, has the advantage of resource load balancing, no centralization, peer-to-peerequivalence, high distribution of network framework and scalability. Furthermore, MP2Pmakes it convenient to send messages at any time in any place without the base station.However, its other characters such as multi-hop, wirelessness, frequent joining and leaving,and constant leaving perturbation, all pose a series of challenges to achieving the efficiencyMP2P.The paper, concerning on no fix base station, self-organizing wireless networks, is aimedat analyzing the network framework, data processing, caching strategies, routing strategies,with the ultimate objective to enhance the distribution of MP2P network content. The specificcontributions are as follows:Firstly, the study is concerned with the anti-perturbation of wireless mobileself-organized network topology. The rumor of mobile equipment induces such genericproblems as difficulty in manageability and maintenance to self-organized networks. However,network framework is one of the key factors and the first step for the design of MP2P networkcontent distribution mechanism. The paper, considering the dynamic nodes of MP2P, proposesa network architecture based on sphere cluster, which divides the network into multiplesubnets managed by partition. Each subnet is managed by super node for information routingand distribution. The information is then transmitted by the transition node in crossing area toguarantee the connection of the information exchange. The strategy proposed herein canefficiently reduce the transmission delay and the influence of download success rate, andhence the hit rate can be improved.Secondly, based on the aforementioned wireless ad hoc network topology, in terms of theproblems of the over-reliance of data download success rate on the seed online, repeated datatransmission and liability of network congestion, this paper proposes a network strategy to improve the content distribution efficiency of MP2P network. This strategy, in addition tostoring and forwarding information, can encode and decode information in the node. In themeantime, it reduces the rate of repeated data, space occupied by traffic data, shortenstransmission time, and eases channel congestions. Thus the download success rate isimproved, the transmission delay reduced the robustness of the MP2P content distributionenhanced as well.Thirdly, the dynamic feature of nodes would result in the instability of carried resources,and thus a proportion of nodes are required to assist caching. However the limited capacity ofmobile terminals is limited would influence the content distribution efficiency. This paperhereby proposes a new cache strategy to optimize the node storage, make full use of thelimited storage space, update the storage the information in time and prevent the cacheoverflowing. Therefore, caching data by means of encoding a proportion of network canreduce the average connection of inquiring nodes and storage nodes, accelerate downloadspeed, increase hit rate, and reduce data download delay.Last but not least, the present study devises a routing plan to solve to problem ofreducing the influence of limited bandwidth and perturbation on data transmission. Therefore,based on network topology of sphere cluster, this paper proposes a routing plan that enhancesthe connection of routing nodes on basis of semantic similarity, as well as pushing relevantdata and reducing repeated data transmission. When the node moves within a certain speedrange, this routing strategy can effectively improve the recall rate and query efficiency, reducetransmission delay, enhance inter-node collaboration capability, and improve data distributionmechanism.This dissertation, based on the study of MP2P network distribution mechanism, exploresnetworking framework, data transmission and storage strategy, as well as routing strategy, andfurther proposes relevant detailed plans for key technologies and modules.