延时容忍网络中基于内容的信息传播机制研究

摘要

延时容忍网络(Delay-tolerant Network)是一种实用的受限网络模型,它具有延迟长、网络分割、节点能力受限等特点.在这种网络环境下,由于网络拓扑不断变化,节点间端到端的通信路径并不存在,传统的路由协议无法有效的运作.针对延时容忍网络的特点,提出了一种基于内容的信息传播机制.在该机制中,每个节点根据相遇历史信息决定是否对所获得的信息进行转发.实验结果表明,该信息传播机制在通信延迟和信息开销方面,较传统OCBD协议和Epidemic协议有所提升.%Delay-tolerant network (DTN) is a practical restricted network model.The characteristic of DTN includes long delay,lacking of continuous network connectivity and low capability nodes.In this kind of network,the topology of the network change frequently that end to end path for messages delivery no longer exists,so traditional routing protocols do not function well.According to these shortages,a content-based routing protocol is proposed.In this protocol,each node decides whether to relay a message or not according to its encounter history.The experimental results show that the proposed protocol obtains the lower transmission delay and less overhead,compared to Opportunistic Content-Based Dissemination (OCBD) and Epidemic protocol.