基于内容中心网络的移动性管理方法设计与实现

发布时间：2018-03-27 18:30

本文选题：内容中心网络　切入点：内容提供者　出处：《北京邮电大学》2017年硕士论文

【摘要】：目前,手机、平板等可移动便携设备在全球激增,用户不仅是网络内容的请求者,同时也可以作为内容提供者来响应网络中的用户请求。在内容中心网络(Content-Centric Networking,CCN)中,相对于内容请求者移动,当内容提供者移动后,所有与该内容提供者通信的请求者都需要重新建立与其的通信,导致内容提供者移动性能差、内容难以及时获取等问题。因此,内容中心网络中的内容提供者移动性管理是当前亟待研究和解决的问题。论文总结了内容中心网络中的内容提供者移动性研究现状,分析了当前内容提供者移动存在的切换时延高、内容获取时间长和路由表难以聚合等问题,提出了一种基于重要节点主动缓存的内容提供者移动性管理方法(PCVN)。首先,在该方法中,设计实现了一种重要节点发现算法,通过度中心性、节点删除破坏度、路由介数中心性和节点活跃度评估和识别重要节点。同时,选取Zipf-like算法模型计算各个内容对用户请求的贡献度,通过对内容贡献度排序得到内容提供者中需要被主动缓存的特定内容。PCVN方法将内容提供者中的特定内容主动缓存到重要节点实现特定内容的高效分布,提高内容提供者的移动切换性能。最后,设计实现了 PCVN方法的主要功能模块,并基于ndnSIM搭建了仿真实验环境,测试结果表明PCVN方法在内容提供者移动过程中能够降低切换时延和内容获取时间。
[Abstract]:Mobile devices, such as mobile phones and tablets, are proliferating around the world. Users are not only Web content requesters, but also content providers to respond to user requests on the network. In Content-Centric networking CCNs, When the content provider moves, all the requesters who communicate with the content provider need to re-establish the communication with the content provider, which leads to the poor mobility performance of the content provider and the difficulty of obtaining the content in time. Content provider mobility management in content-centric network is an urgent problem to be studied and solved. This paper summarizes the research status of content-provider mobility in content-centric network. In this paper, the problems of high handoff delay, long content acquisition time and difficult aggregation of routing table are analyzed. A content provider mobility management method based on active caching of important nodes is proposed. In this method, an important node discovery algorithm is designed and implemented, which evaluates and identifies important nodes by degree centrality, node deletion damage, routing intermediate-centrality and node activity. The Zipf-like algorithm model is selected to calculate the contribution of each content to the user request. By sorting the content contribution, we get the specific content in the content provider that needs to be actively cached. The PCVN method can actively cache the specific content in the content provider to the important node to achieve the efficient distribution of the specific content. Finally, the main function modules of PCVN method are designed and implemented, and the simulation environment based on ndnSIM is built. The test results show that the PCVN method can reduce the handoff delay and content acquisition time in the process of content provider moving.
【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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