基于网络拓扑动态性分析的车载网数据传输机制研究

发布时间：2018-01-09 08:08

本文关键词：基于网络拓扑动态性分析的车载网数据传输机制研究　出处：《北京邮电大学》2015年硕士论文　论文类型：学位论文

【摘要】：智能交通系统已逐渐成为全球的研究热点,而作为智能交通系统重要基础之一的车载网络(Vehicular Network)正是在这种背景之下越来越重要。随着无线网络技术的快速发展,作为车载网络研究主要方向之一的车载自组织网络(Vehicular Ad-hoc network, VANET)越来越受到人们的关注和重视。车载自组织网是一种特殊的移动自组织网络(Mobile Ad-hoc network, MANET),车载网不同于普通移动自组织网络的特点包括车辆移动速度快造成拓扑变化较快、车辆密度变化造成车载网容易中断、车辆的移动受限于道路拓扑导致了网络中的拓扑空洞。车载自组织网络的这些特点,为VANET环境下数据传输机制的设计带来了极大的挑战。车载自组织网络不是一个静态的网络,随着车辆的加入和离开,拓扑随之变化,发展车辆通信和服务协议的关键问题是了解车辆自组网的拓扑特征。本论文以里昂大学URBANET项目组开放的TAPASCologne项目数据为基础,采用复杂网络的方法,用多个指标研究了大规模车载自组织网络的拓扑特征,在连接级层次上探究对于路由和数据分发重要的关键节点；分析了在大规模城市场景下,网络连通性、节点重要性以及网络的稳定性方面的拓扑特性。另外,在拓扑分析的基础上,本论文提出了一个结合拓扑知识与地理位置的路由策略。路由策略以贪婪转发的思想为基础,考虑城市场景下道路拓扑的限制,数据转发以逐路段的方式进行；将地理位置和半局部中心指标结合在一起以选择Target节点；利用机会转发的方式,选定多个候选节点竞争转发,提高数据传输的可靠性；在路口处增加静态节点以辅助数据传输,减少障碍物的干扰。最后,通过仿真软件NS2对提出的路由策略进行仿真验证,验证了路由策略在数据接收率、传输时延、网络开销等方面的优势。
[Abstract]:Intelligent Transportation system (its) has become a global research hotspot. As one of the important bases of Intelligent Transportation system, vehicle Network is becoming more and more important under this background. With the rapid development of wireless network technology. As one of the main research directions of vehicular network, vehicular Ad-hoc network. Vehicle Ad Hoc network is a special kind of mobile ad hoc network, Mobile Ad-hoc network. Manet, vehicle network is different from the ordinary mobile ad hoc network, such as the rapid speed of vehicle movement resulting in rapid topology changes, vehicle density changes caused by easy disruption of the vehicular network. The mobility of vehicles is limited by the road topology, which leads to the topology holes in the network. These characteristics of the vehicle-borne ad hoc networks. It brings great challenges to the design of data transmission mechanism in VANET environment. The vehicle-borne ad hoc network is not a static network, with the addition and departure of vehicles, the topology changes. The key to develop vehicle communication and service protocols is to understand the topological features of the ad hoc network. This paper is based on the open TAPASCologne project data of the URBANET project team at the University of Lyon. . By using the method of complex network, the topological characteristics of large scale vehicle-borne ad hoc networks are studied with several indexes, and the key nodes which are important for routing and data distribution are explored at the connection level. The topology characteristics of network connectivity, node importance and network stability in large-scale urban scenarios are analyzed. In addition, based on topology analysis. In this paper, a routing strategy combining topology knowledge with geographical location is proposed. The routing strategy is based on the idea of greedy forwarding, considering the limitations of road topology in urban scenarios, and data forwarding is carried out on a section-by-road basis. The geographical location and the semi-local central index are combined to select the Target node. In order to improve the reliability of data transmission, several candidate nodes are selected to compete for forwarding by the way of chance forwarding. The static nodes are added at the intersection to assist the data transmission and reduce the interference of obstacles. Finally, the proposed routing strategy is verified by the simulation software NS2, which verifies the data reception rate of the routing strategy. Transmission delay, network overhead and other advantages.
【学位授予单位】：北京邮电大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TN929.5;U495

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