基于时间预测的ICN路由转发策略研究

发布时间：2019-01-26 18:56

【摘要】：随着互联网技术的飞速发展,校园网络中智能移动终端数目与日俱增。传统的移动自组网基于IP网络,以主机为中心,始终需要面向目的地址来获取内容资源。当主机的位置和移动速率发生变化时,该一对一通信就会被终止。以主机为中心的通信方案中频繁地建立连接,会加大网络开销,使移动自组网的性能受到影响。与此同时,信息中心网络是以内容为中心的一种新的网络体系架构,该网络虽能改变以主机为中心的现状,但是该体系中的转发机制并不能直接用于移动自组网,原有的组件很难高效地完成兴趣包与数据包的路由转发,因此信息中心网络体系的组件与路由转发策略在应用于移动自组网过程中需要改进。现有两个问题需要解决:节点的移动会导致通信链路中断、数据包无法回传;实际场景中,节点识别、路由建立、内容发现等问题使得信息中心网络节点之间交互的有效性较低。本文研究的第一个内容是如何对上述信息中心网络应用在移动自组网环境中的路由转发策略进行改进。首先,调研了节点移动模型的研究现状,接着结合校园场景下移动自组网中节点的移动特性与数据交互的特点,分析了现有的信息中心网络组件对移动自组网中路由转发的影响。然后,结合校园移动自组网节点移动的特点和信息中心网络结构,提出了基于时间预测的路由转发策略。该策略通过对一跳范围内节点状态的探测,计算出每个转发路由的可用时间,并进一步预测未来一段时间内仍可用的概率,再根据概率大小,从中选出最优的路由转发节点。接着,本文对转发策略进行了仿真实验,从响应时间、缓存命中、网络流量三方面对转发策略进行了评估。本文研究的第二个内容是如何在现实移动自组网场景中实现信息中心网协议的测试。本文在基于时间预测路由转发策略的基础上,设计出了可以应用在校园移动自组网络中的信息中心网络测试床。该测试床依托校园移动场景,对现有NDN框架进行开发改进,增加了信息中心网络的路由建立和维护、节点识别、内容发现、路由转发等功能。然后,借助个人移动电脑等常用设备,搭建真实可用的测试环境,开发了文件下载应用。最后,通过对服务端与客户端下载时间与下载速度的监测,对测试床进行了评估。仿真和实验表明,本文提出的基于时间预测的路由转发策略能有效提高信息中心网络协议在校园移动自组网场景中的内容交互水平;本文实现的测试床能支持移动校园场景的简单应用。
[Abstract]:With the rapid development of Internet technology, the number of intelligent mobile terminals in campus network is increasing day by day. The traditional mobile ad hoc network is based on IP network and takes host as the center. It always needs the goal-oriented address to obtain the content resource. The one-to-one communication is terminated when the host's position and moving rate change. Establishing connections frequently in host-centered communication schemes will increase network overhead and affect the performance of mobile ad hoc networks. At the same time, the information center network is a new content-centric network architecture. Although the network can change the host-centered situation, the forwarding mechanism in the network can not be directly used in mobile ad hoc network. It is very difficult for the original components to accomplish the routing of interest packets and packets efficiently, so the components and routing forwarding strategies of the information center network system need to be improved in the process of application in mobile ad hoc networks. There are two problems that need to be solved: the node movement will lead to the interruption of the communication link and the packet cannot be sent back; In the actual scenario, the problems of node identification, routing and content discovery make the interaction between nodes in the information center less effective. The first content of this paper is how to improve the routing and forwarding strategy of the above information center network application in the mobile ad hoc network environment. First of all, the research status of node mobility model is investigated, and then the characteristics of node mobility and data interaction in campus mobile ad hoc network are combined. The influence of existing information center network components on routing and forwarding in Manet is analyzed. Then, considering the characteristics of campus mobile ad hoc network and the network structure of information center, a routing and forwarding strategy based on time prediction is proposed. The strategy calculates the available time of each forwarding route by detecting the state of nodes in the one-hop range, and further predicts the probability that will still be available in a certain period of time in the future. According to the probability, the optimal routing forwarding node is selected. Then, the forwarding strategy is simulated and evaluated from three aspects: response time, cache hit and network traffic. The second content of this paper is how to realize the test of information center network protocol in the real mobile ad hoc network scenario. Based on the strategy of routing and forwarding based on time prediction, this paper designs an information center network test bed which can be used in campus mobile ad hoc network. Based on the campus mobile scene, the test bed develops and improves the existing NDN framework, and adds the functions of information center network routing establishment and maintenance, node identification, content discovery, routing forwarding and so on. Then, with the help of personal mobile computer and other commonly used equipment, build the real and usable test environment, develop file download application. Finally, the test bed is evaluated by monitoring the download time and speed of server and client. Simulation and experiments show that the proposed routing and forwarding strategy based on time prediction can effectively improve the content interaction level of information center network protocol in campus mobile ad hoc network scenario. The test bed realized in this paper can support the simple application of mobile campus scene.
【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】：TP393.0

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