Research And Design About Meshy Multicast In Mobile Instant Messaging Under Peer-to-Peer Environment

Mobile IM system is an instant messaging system used on mobile devices. At the age of "Internet+", increasing enterprises use IM system to enhance operation effectiveness. However, supporting IM system requires a lot of resource, such as bandwidth and CPU. In P2P(peer-to-peer) network, node of device can connect to each other directly, which will reduce the spending of server on IM for relaing messages. At present, mobile IM application is easy for two clients to communicate by P2P directly, but has no methods for multi clients to communicate by P2P. IM system on personal computer can group-chat by P2P, but it takes large amounts of resources, which is not suitable for mobile terminal with poor performance and complex network environment. In summary, there is lack of a suitable mobile IM system network multicast message forwarding mechanism and an implementation of mobile IM system based on this mechanism.Based on the requirements above, this paper studies a mechanism of messages forwarding in meshy multicast. It is based on no-scale network,where messages can multicast in fewer skips, and each node's spending is affordable. In order to implement the forwarding mechanism, this paper models and analyses it based on complex network. According to the mechanism, this paper design algorithm for meshy multicast topology and policy for messages forwarding.On the basis of the message forwarding mechanism in meshy multicast, this paper designs an IM project including server by Java and client by iOS, which mainly implements founction of group chatting by P2P. This project implements the development of IM mainly for group chatting by requirement analysis, preliminary design, detailed design and Implementation, System test.In summary,this paper studies a mechanism of messages forwarding in meshy multicast, which ensure the load of node is acceptable and the transmission of message is limited. Based on the mechanism, this paper implements an IM project by P2P for group chatting, which reduces the load of server and saves resources for enterprise.