P2P环境下网状组播在移动IM中的研究与实现

发布时间：2018-05-02 02:28

本文选题：网状组播 + 消息转发　；参考：《北京邮电大学》2017年硕士论文

【摘要】：移动IM (instant messaging)系统是在移动端上使用的即时通信系统。在“互联网+”的时代下,越来越多的企业使用IM系统以提高工作效率,然而IM系统对服务器的带宽、CPU等资源的开销有很高的要求。在P2P (peer-to-peer)网络中,节点与节点之间直接通信,可以节省服务器转发消息所需要的开销。当前有的移动IM系统支持两个终端以P2P的方式通信,但并不支持多个节点以P2P的的形式进行多对多通信;PC端有支持P2P方式群聊的IM系统,但对终端性能要求很高,不适用于性能差、网络环境复杂的移动端。综上,目前缺乏一种适用于移动IM系统中网状组播的消息转发机制,也缺少基于该机制的移动IM系统实现。课题基于以上需求,研究了网状组播的消息转发机制,该机制利用了无标度特性的网络拓扑,使消息能够按照该拓扑以较少的转发次数到达群组内所有成员节点,且每个节点转发开销都在可承受范围内。为实现网状组播消息转发机制,课题对网状组播系统进行建模分析,然后在模型的基础之上实现了组播拓扑生成算法,最后研究了利用生成的拓扑完成消息转发的策略。在网状组播消息转发机制基础之上,课题利用iOS客户端与java服务器实现了 P2P环境下以群聊为主的移动IM功能。课题项目对P2P环境下群聊所需要的网状组播拓扑计算功能及网状组播消息转发功能进行了需求分析、概要设计、详细设计与实现、功能测试,完成了项目的开发。综上,本课题主要研究了网状组播的消息转发机制,使组播过程中,终端节点在资源开销可承受范围内尽力转发消息。课题项目基于研究成果,实现了基于P2P方式的移动IM组播功能,这种通信方式减轻了服务器的负担,节约了企业资源,具有一定的实用价值。
[Abstract]:Mobile IM instant messaging system is an instant communication system used on the mobile terminal. In the era of "Internet", more and more enterprises use IM system to improve their working efficiency. However, IM system has a high demand on the cost of server bandwidth, CPU and other resources. In P2P networks, direct communication between nodes can save the cost of forwarding messages. At present, some mobile IM systems support two terminals to communicate in P2P mode, but do not support multiple nodes in the form of P2P to carry out multi-to-many communications / PC systems that support P2P group chat, but the performance of the terminals is very high. Not suitable for poor performance, complex network environment mobile terminal. In summary, there is a lack of a message forwarding mechanism for mesh multicast in mobile IM systems, and a mobile IM system based on this mechanism is also lacking. Based on the above requirements, this paper studies the message forwarding mechanism of mesh multicast. This mechanism utilizes scale-free network topology to enable messages to reach all member nodes of the group with less forwarding times according to the topology. And the forwarding overhead of each node is within the range of affordability. In order to realize the message forwarding mechanism of mesh multicast, this paper analyzes the modeling of mesh multicast system, and then implements the algorithm of multicast topology generation based on the model. Finally, the strategy of message forwarding using generated topology is studied. Based on the message forwarding mechanism of mesh multicast, we use iOS client and java server to realize the mobile IM function of group chat in P2P environment. In this paper, the network multicast topology computing function and message forwarding function in group chat in P2P environment are analyzed, the outline design, the detailed design and implementation, the function test, and the development of the project are completed. In summary, this paper mainly studies the message forwarding mechanism of mesh multicast, which makes the terminal node try its best to forward the message in the range of resource overhead. Based on the research results, the project realizes the mobile IM multicast function based on P2P mode. This communication mode reduces the burden of the server, saves the enterprise resources, and has certain practical value.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TP393.03

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