【作者】 杨超；

【导师】 马建峰；

【作者基本信息】 西安电子科技大学 ， 计算机系统结构， 2005， 硕士

【摘要】 随着公路和车辆的智能化，越来越多的车辆和公路边的基础设施都开始装备通信设备。不久的将来，车辆需要能够在一个暂时的、自组织的、快速变化的无线移动网络中进行通信；同时，这些车辆还应能访问公路边的网络设施。因此，诞生了“车辆网络”这个新概念(vehicular network)。这种车辆网络有时也被称为“车辆Ad-hoc网络(VANET)”，它作为“智能交通系统(intelligent transportation system)”的重要组成部分，以及无线移动Ad hoc网(MANET)的一种特殊应用，已经得到越来越多的重视。 首先，本文介绍了“无线移动车辆网”的概念，以及国内外的研究现状。在此基础上，分析了车辆网络的特点，给出了车辆网络的体系结构和几种实际的应用场景，并进行了相应的需求分析。 其次，在总结前面技术的基础上，提出了车辆网络中数据分发的三种体系结构，详细研究了它们的特性和应用范围，按其特点对数据分发技术进行了合理的分类，并给出了每种体系结构下数据分发的算法思想和设计思路。 最后，我们提出了一种新的车辆网络的数据分发协议VNDDA(Vehicle Networks Data Dissemination Algorithm)，该协议在地理位置路由协议的基础上，结合几率分发和延期等待的设计思想，根据车辆节点的位置、速度、方向以及事件的紧要程度来动态分发事故信息；该协议综合了先应式和反应式的协议特点，对车辆网络的高速移动与频繁的拓扑变化有很好的自适应性，可以基本满足提出的几项应用需求；随后，给出了下一步的研究方向和研究目标。更多还原

【Abstract】 Both modern high-speed motorways and vehicles that drive upon them are becoming increasingly intelligent. In particular, communication devices are being installed in more and more cars and roadside infrastructure components. In the not-too-distant future, traveling vehicles will be able to communicate while forming ephemeral, rapidly changing ad hoc network. At the same time, they will have direct access to a fixed roadside network infrastructure with information flowing both ways. So, this brings about the naissance of the vehicular network. Sometimes it is also called as VANET. As a component of the intelligent transportation system (ITS) and one of the concrete applications of mobile ad hoc network, VANET has attracted research attention from both the academia and industry.First, this paper introduces the "wireless mobile vehicle network" concept and summarizes some research projects of vehicle network abroad in recent years and their experiences. On this basis, it analyzes the characteristics of the vehicle network shows the architecture of the vehicle network and sums up several kinds of real application scenes with the analysis of the corresponding demandSecond, on the basis of summarizing the foregoing technology, the paper gives three kinds of architecture of data dissemination for the vehicle network. With the investigation of their characteristics and ranges of applications and classification of the data dissemination, it gives the idea of designing the data dissemination algorithm under various kinds of architecture.Finally, this paper proposes a novel vehicle network data dissemination algorithm (VNDDA). VNDDA is designed to exploit vehicle mobility for data dissemination, and combines the idea of opportunistic forwarding, postponed waiting forwarding and geographical forwarding. This algorithm is used to disseminate data in vehicle network according to the vehicle’s position, velocity, direction and the critical degree of accidents. In the contrary of most existing protocols, VNDDA is reactive and adaptive dedicated to supporting the exchange of information between traffic participants effectively. At the end of the paper is provided the next research direction and aim.更多还原