DTN (delay tolerant network) use the communication opportunities formed by node's movement to make message transmission by hop,and achieve the communication between bodes according the "store-carry-for-wards" way,which makes up the defect that the traditional network needs to establish the source node to the destination node link.The DTN network have some characteristics,such as high latency,intermittent link,lower transmission rate,so the link prediction is important particularly,and accurately link prediction to improve network efficiency is significant.There are two main ways in link prediction,using the similarity of node network community and establishing node contact probability mode.Markov modulated Poisson process model (MMPP) node is contact model established based on real data sets.The simulation of DTN network is the lack of suitable software,of which the real-life data sets support is not enough.A DTN network emulator have been developed based on the contact event,reading the real data,using the above two method to establish the route,and on this basis,different simulation comparison was maken to different routing methods,from the transmission rate,transmission delay,transmission hops,transmission efficiency,etc.The simulation results show that the use of the routing method of MMPP model,the comprehensive assessment of transmission rate,delay and transmission efficiency,superior to the other routing methods,which consume less network resources and achieve a higher transfer rate.The routing comparison between the based node contact model and the.node similarity established community network has proved that the based node contact model is more suitable for limited network resources.%容延网络(delay tolerant network)利用节点移动形成的通信机会逐跳传输消息,以“存储-携带-转发”的路由模式实现节点间的通信,弥补了传统网络需要建立源节点到目的节点链路的缺陷.容延网络延迟高,链路具有间断性,传输率较传统网络低,链路预测就尤为重要,准确的链路预测对于提高网络效率意义重大.链路预测有两种主要的方法:利用节点社区网络的相似性进行预测和建立节点接触概率模型.马尔可夫调制泊松过程模型(MMPP)就是根据现实数据集建立的节点对接触模型.容延网络的仿真缺乏合适的软件,对于现实生活中的数据集支持不够.开发了关于基于接触事件的容延网络仿真器,读取现实数据,运用上述两种方法建立路由,在此基础上,进行了不同的仿真对比、从传输率、传输延迟、传输跳数、传输效率和传输的综合评定等方面,对不同的路由方法进行了对比.仿真实验结果表明利用MMPP模型的路由方法传输率、延迟和传输效率的综合评定上,优于其他的路由方法,即可以消耗较小的网络资源以达到高的传输率.基于节点对接触的模型对比节点社区网络相似性建立的路由方法,更加适合资源有限的网络.
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