基于概率和重要性的DTN路由及缓存管理研究

发布时间：2018-07-28 14:11

【摘要】：DTN网络是近年来无线网络领域的一个研究热点,有着广泛的应用场景。DTN网络具有拓扑结构不断变化、连接间歇性中断等特性,无法保证在消息传递过程中存在稳定可靠的端到端路径,这与传统网络的基本假设截然不同,为此,研究学者设计了“存储-携带-转发”的方式在DTN网络中进行消息传输。如何高效的将消息成功传递到目的节点,如何处理消息对有限存储资源的竞争,是DTN网络技术研究中的核心内容。本文在总结近年来DTN网络路由和缓存管理的研究成果基础上,提出了一个基于概率和重要性的DTN路由协议及其缓存管理方法,本文的主要工作如下:1)介绍了DTN网络的体系结构、特点、应用场景,并综述了DTN路由和缓存管理的现状。2)提出了基于概率和重要性的DTN路由协议PROSIG,协议设计了消息副本数量的估计方法和消息重要性度量函数,并依此定义了消息转发优先函数,用于路由过程的消息转发排序,实现了消息转发策略。3)为基于路由协议PROSIG的缓存管理方法设计了一个消息删除优先函数,用于节点缓存溢出时的消息丢弃排序,保证了把资源优先分配给最有机会成功传递的消息。4)采用DTN仿真软件ONE进行了模拟实验,仿真结果表明,PROSIG协议及其缓存管理策略能有效的提高消息的传输成功率,并降低网络负载,对资源有限的DTN网络有实用意义。
[Abstract]:DTN network is a research hotspot in the field of wireless network in recent years. There is a wide range of application scenes that have the characteristics of continuous changes in topology and intermittent interruption, which can not guarantee the existence of a stable and reliable end to end path in the process of message transmission, which is different from the basic assumptions of the traditional network. For this reason, researchers The "storage carry forward" method is designed for message transmission in the DTN network. How to efficiently transfer messages to the destination node and how to deal with the competition of the limited storage resources is the core content of the DTN network technology research. This paper summarizes the research foundation of the DTN network routing and caching management in recent years. A DTN routing protocol based on probability and importance is proposed and its cache management methods are proposed. The main work of this paper is as follows: 1) the architecture, features, application scenarios of the DTN network are introduced, and the status quo of the DTN routing and cache management is summarized. The DTN routing protocol based on the probability and importance of the DTN routing protocol PROSIG is proposed. The protocol has designed the message. The estimation method of the number of copies and the message importance measure function, and then define the message forwarding priority function, use the message forwarding ordering in the routing process and implement the message forwarding strategy.3). A message deletion priority function is designed for the cache management method based on the routing protocol PROSIG, which is used for the message loss when the node caches overflow. By giving priority to the allocation of resources to the most successful message.4), the simulation experiment is carried out by the DTN simulation software ONE. The simulation results show that the PROSIG protocol and its cache management strategy can effectively improve the success rate of the message transmission and reduce the network load, which is of practical significance to the limited resource DTN network.
【学位授予单位】：北京理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TN92

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