Research And Implementation Of Mobile Social Network File Distribution Service

The Mobile social network is a new type of network application that the information transmission in the network is realized though mobile network nodes that have the social attributes and the mobile characteristics and the way of "store carry forward".With the development of wireless communication technology,more and more mobile terminals enter into people's daily life.At the same time,the trip methods are more and more diversified,the scope of the movement is more and more widely.The ability to store and transmit information in mobile devices is increasing.File is one of the most popular carriers of Internet information transmission and researchers have done much work on the mode of file transmission and file distribution application.However,there are few researches of file transfer in mobile social network.With the development of mobile social network,the size of the network node and the node's ability to move,storage capacity continues to improve,providing the supports for the transfer of files in the mobile social network and improving the file distribution service in people's daily lives with other network structure.So this thesis will introduce two mobile social network file distribution algorithms and an Application of file distribution service.Firstly,this thesis introduces the characteristics of the mobile social network,and then focuses on the way of getting attributes of the nodes in the network,the mobile model and the data delivery algorithm.Those researches provide suggests for file transfer in the mobile social network though the results,application scenarios and problems of mobile social network.In addition,this thesis introduces a detailed study on the file distribution system in P2 P network,and points out the main factors and some strategies affecting the distribution of files.Those provide guidance for the development of mobile social network file distribution algorithms.Based on the researches of mobile social network and file distribution,this thesis proposes a file distribution algorithm,named a file distribution algorithm for uniform distribution of file blocks,which combines the mobility characteristics of the nodes and the correlation of the file block.In this algorithm,the distribution of file blocks in the network is estimated by recording the information of the session nodes and the file list information.Then the priority of file blocks will be determined based on the principle that the file block in the network is distributed evenly.So the algorithm will improve the forwarding efficiency of the file in the network.However,the algorithm does not take into account the impact of the file copy on the network performance.Based on this algorithm,an improved algorithm is proposed,named file distribution algorithm for node partition.In this algorithm,all nodes in the network are divided into several communities.And all nodes in a community is a storage unit of a file.In the community,according to the node's social attributes and moving characteristics,the concept of community connection nodes and community interior nodes is proposed.Then transmission and receiving nodes of the file block are determined according to the characteristics of the nodes and the distribution of the file block,so as to improve the efficiency of file distribution.In this thesis,the above two algorithms are verified by simulation,and an APP application of file distribution service is implemented.Details of the implementation process and technology are introduced and a screen sharing service is expanded in this application for instant file transfer at on-site meetings and other special occasions.