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由于DTN(delay tolerant networks)缺乏稳定的端到端传输路径,为了提高其路由协议的传输效率,减少网络延迟和开销,主要采用增加冗余数据包副本的办法.而传统的DTN路由协议往往无法有效地控制数据包副本的数量,最终导致路由性能下降.由于DTN网络中的节点具有社会属性这一特点,使得节点的移动具有一定的规律性和稳定性.首先分析了节点之间信息交换关系,证明DTN中存在二分图的性质.其次提出DTN网络中基于二分图的路由选择和具有时间因素的最优路由算法,最后给出了模拟仿真实验结果.
Due to the lack of a stable end-to-end transmission path of DTN (delay tolerant networks), in order to improve the transmission efficiency of its routing protocol and reduce the network delay and overhead, the main method is to increase the redundant data packet copy, while the traditional DTN routing protocol often can not Effectively control the number of copies of the data packet and finally lead to the degradation of the routing performance.Due to the characteristics of the social attribute of the nodes in the DTN network, the movement of the nodes has certain regularity and stability.Firstly, the information exchange relationship between nodes , Which proves that DTN has the property of bipartite graph.Secondly, this paper proposes a routing algorithm based on bipartite graph and an optimal routing algorithm with time factor in DTN network. Finally, the simulation results are given.