基于车载自组网的匿名认证机制

车载自组网中,车辆在进行相互通信时需要对收到的信息进行合法性验证,但同时又不希望自己的身份被泄露,从而导致了安全与隐私保护之间的问题。匿名认证是车载自组网中安全和身份隐私保护的关键机制,本文对现有的匿名认证方案进行了分类对比,分析了各个方案的优缺点。     

自组网中利用地理位置信息的路由协议研究

总结了自组网中利用地理位置信息的路由协议,并将这些协议分为两类:位置辅助路由协议和基于位置信息的路由协议.介绍了这两类协议的典型协议,并详细分析了各个协议的优缺点,提出了利用地理位置信息路由协议的研究方向.     

基于DSRC的车载自组网终端设计及性能测试

利用低功耗X86平台和嵌入式Linux平台,设计了一种基于DSRC的车载自组网通信系统方案。介绍了系统的软硬件架构,并进行了软硬件的设计与实现,最后在城市视距场景和跨江大桥场景下对该系统进行了丢包率、吞吐量以及延时抖动的测试分析。     

智能交通自组网的设计与实现

提出了一种智能交通自组网的实现方案,该方案采用适应于车辆移动环境的IEEE 802.1 1p标准,改进车载自组网路由协议,并基于该网络架构实现车辆交通感知与全方位导航等应用.测试结果表明,基于该方案的智能交通自组网的网络性能满足车载通信的要求.     

车载自组网中的网络与信息安全

因自组织网络无中心的特点,传统有中心网络中成熟的安全保障机制无法得到直接应用。为了使车载通信技术得到更加广泛的应用,安全问题必须得到很好的解决。文章对车载自组网的安全需求及目标进行分析,然后从安全路由、密钥管理和入侵检测3个方面对车载自组网安全研究的现状进行介绍。在这3个方面中,安全路由研究最为广泛,而密钥管理则是保障车载自组网安全的关键。     

基于排序的高效交通信息分发算法

提出了一种高效的基于车载自组网的实时交通信息分发算法--ETDAR算法.ETDAR算法中,所有的参与者根据本地信息确定交通信息报告的分发时机及每次广播的报告数,有效地利用了带宽并能很好地适应于各种密度的网络拓扑.算法通过对报告进行排序来解决带宽及节点存储量受限等问题.最后,提出了一种新的算法性能评估标准,并基于此评估标准,通过仿真实验将ETDAR算法与另一种泛洪方式的交通信息分发算法--Grassroots算法进行比较.实验结果显示,ETDAR算法的性能在不同的节点密度、网络带宽下均优于Grassroots算法.     

基于动态组的车载自组网批量认证

针对车载网分组管理时组的动态特性,车辆与路边单元相互认证开销大的问题,本文提出了基于动态分组的车载网批量认证方案.该方案首先完成组代理节点与路边单元的相互认证,进而通过组代理节点收集周围需要通信车辆的信息,并将组内的车辆信息传递给路边单元,同时对路边单元进行批量认证,降低了认证开销.理论分析与实验仿真,验证了本文方法的有效性.     

车载自组网（VANET）通信模型分析

车载自组织网络是专用移动自组织网络中研究和应用最活跃的领域之一,它是未来构建智能交通系统的主要载体,同时也是建设“信息地球”、“智慧城市”的重耍组成部分。本文从分析车载自组织网络特有的网络特性出发,提出了五种基本通信模式,为车载网络的研究和应用提供了参考依据。     

WAVE/WiMAX混合车载自组网路由研究

提出一种混合网络中节点密度自适应的路由协议,能够实现全网各条道路上实时车流的估算,并根据节点密度自适应地选择WiMAX或WAVE网络发送数据包,同时动态生成数据包转发的源路由.仿真实验表明,协议的数据包递送成功率有较大幅度提高,端到端平均递送延迟较小,并且WiMAX开销增长较小.     

一种基于车载自组网的停车位协作发现算法

在停车位发现问题中,车辆节点快速变化的拓扑结构使停车位的选择和分配变得非常复杂.车载自组网多跳通信的特点使车辆节点容易产生抢占式不良竞争,从而造成无效的车辆行驶.基于OAPS算法和模拟退火算法,提出了一种停车位协作发现算法（COAPS）,综合考虑当前节点与邻居节点的整体开销,进而实现停车位资源在车辆节点间的协作分配.通过在VanetMobisim平台上仿真比较,验证COAPS算法具有较短的停车位发现时间和车辆协作性.     

车载自组织网络的体系结构和通信协议研究

在对车载自组织网络的特点和研究现状分析的基础上,文章给出了车载自组织网络（VANET）中多维多层的理论模型和网络体系结构,讨论了物理层技术及其相关标准以及MAC层、网络层协议设计的重点和难点,阐述了广播协议的设计思路。     

一种基于可靠性的车载自组织网络路由算法

提出了一种改进的GPSR路由算法.该算法在选择转发节点过程中同时考虑位置和方向,进而提高转发节点选择的正确性来增加通信链路可靠性.用VanetMobisim交通仿真软件构建真实的VANETs网络城市场景,结合NS-2进行仿真研究,结果表明,和传统GPSR算法相比,改进的GPSR路由算法在端到端时延影响不大的条件下,能够有效地提高数据包传递率,降低数据丢包率.因此,改进的GPSR协议更适用于对实时性要求不高、而对可靠性要求较高的VANETs网络.     

车载自组织网络关键技术

车载自组织网络(VANET)是一种自组织、结构开放的车辆间通信网络,随着无线通信技术与交通业联系的日益密切,VANET得到了大力发展。本文从VANET的基本概念和发展进程出发,综述VANET的关键技术。首先介绍VANET的网络模型、主要特点及体系结构,然后对VANET的物理层、MAC层、路由协议及应用层的研究内容和研究现状进行了系统阐述,最后对VANET今后的研究方向和应用前景进行了展望。     

基于协议序列的车辆自组织网络信道接入控制算法

 针对如何提高车辆自组织网络无线信道资源利用率问题,提出了一种分布式车辆间通信信道接入控制算法,该算法具体表示为利用中国余数定理设计一种用户保障协议序列,车辆节点(亦称用户)依据该协议序列决定其对通信信道的接入,无需基站或中心节点的协调,所设计的协议序列确保每个车辆节点在一个序列周期内至少成功发送一次数据.仿真结果表明,采用本文提出的协议序列控制算法比无反馈时隙ALOHA接入控制算法具有更小的传输时延,能够满足车辆自组织网络通信实时性的要求.     

Virtual Private Ad Hoc Networking

The fact that a lot of applications require secure communication to take place only between a dynamic subset of distributed devices sharing a common context, is, from a network point of view, very challenging and demanding. Existing technologies such as VPN, P2P overlays or VLANs can only partially respond to these requirements. This observation is the key factor that has driven the proposal of the virtual private ad hoc network concept. Virtual private ad hoc networks (VPAN) are secure and self-organizing overlay networks on top of existing IP infrastructure that use ad hoc networking techniques to enable network connectivity. The underlying IP infrastructure can be the Internet, cellular networks, ad hoc networks, mesh networks … or combinations thereof. A virtual private ad hoc overlay network creates a transparent, shielded and trusted environment for the applications and services running on the participants' devices. The overlay uses internal addressing and ad hoc routing, thereby forming a virtual network on top of the physical infrastructure. In addition, the overlay must be self-organizing and self-maintaining upon member mobility or membership changes. This paper gives an overview of the potential applications, a high-level network architecture and the network challenges emerging from the novel concept of virtual private ad hoc networking. Jeroen Hoebeke was born in Ghent, Belgium in 1979. In 2002 he received the Masters degree in engineering (Computer Science) from the University of Ghent. In August 2002, he joined the Broadband Communications Networks Group. His PhD research includes the development of adaptive routing protocol techniques for mobile ad hoc networks. His main research interests are in ad hoc wireless communications and, more generally, in broadband wireless communications. Within the European MAGNET project, he is actively involved in the development of a network architecture and demonstrator for Personal Networks, with a prime focus on routing and connectivity. Gerry Holderbeke was born in Zottegem, Belgium in 1982. He graduated in Informatics at the University of Ghent in 2004. In August 2004 he joined the Broadband Communications Networks Group where he is currently working as a project developer. His research currently includes the development of an emulator for mobile ad hoc networks. His main research interests are in ad hoc networks and broadband wireless communications and involve routing, addressing and more generally, communication within mobile ad hoc networks and infrastructured networks. Within the European MAGNET project, he is actively involved in the development of a network architecture for Personal Networks, with a prime focus on the implementation of the routing architecture. Ingrid Moerman was born in Gent, Belgium in 1965. She received the degree in Electro-technical Engineering and the Ph.D degree from the Ghent University, Gent, Belgium in 1987 and 1992, respectively. Since 1987, she has been with the Interuniversity Micro-Electronics Centre (IMEC) at the Department of Information Technology (INTEC) of the Ghent University, where she conducted research in the field of optoelectronics. In 1997, she became a permanent member of the Research Staff at IMEC. Since 2000 she is part-time professor at the Ghent University. Since 2001 she has switched her research domain to broadband communication networks. She is currently involved in the research and education on broadband mobile & wireless communication networks and on multimedia over IP. The main research topics related to mobile & wireless communication networks are: wireless access to vehicles (high bandwidth & driving speed), adaptive QoS routing in wireless ad hoc networks, body area networks, protocol boosting on wireless links, design of fixed access/metro part, traffic engineering and QoS support in the wireless access network. Ingrid Moerman is author or co-author of more than 300 publications in the field of optoelectronics and communication networks. Bart Dhoedt received a degree in Engineering from the Ghent University in 1990. In September 1990, he joined the Department of Information Technology of the Faculty of Applied Sciences, University of Ghent. His research, addressing the use of micro-optics to realize parallel free space optical interconnects, resulted in a PhD degree in 1995. After a 2 year post-doc in opto-electronics, he became professor at the Faculty of Applied Sciences, Department of Information Technology. Since then, he is responsible for several courses on algorithms, programming and software development. His research interests are software engineering and mobile & wireless communications. Bart Dhoedt is author or co-author of approximately 70 papers published in international journals or in the proceedings of international conferences. His current research addresses software technologies for communication networks, peer-to-peer networks, mobile networks and active networks. Piet Demeester received the Masters degree in Electro-technical engineering and the Ph.D degree from the Ghent University, Gent, Belgium in 1984 and 1988, respectively. In 1992 he started a new research activity on broadband communication networks resulting in the IBCN-group (INTEC Broadband communications network research group). Since 1993 he became professor at the Ghent University where he is responsible for the research and education on communication networks. The research activities cover various communication networks (IP, ATM, SDH, WDM, access, active, mobile), including network planning, network and service management, telecom software, internetworking, network protocols for QoS support, etc. Piet Demeester is author of more than 300 publications in the area of network design, optimization and management. He is member of the editorial board of several international journals and has been member of several technical program committees (ECOC, OFC, DRCN, ICCCN, IZS, &).     

车载自组织网络中基于贪婪算法能地理位置路由

车载自组织网络（VANET）技术发展迅速,但由于其特殊的节点类型和信道特性,采用传统AdHoc网络路由协议无法取得满意的性能。实现高速可靠的数据传输速率,需要研究新兴的路由算法。基于贪婪算法的地理位置辅助路由是目前VANET路由的主流思路。文章认为基于这类思路的协议利用车载GPS装置、电子地图和下一代网络导航技术,能使路由发现和建立的时间大大缩短;结合已知的道路拓扑结构,选择多跳传输的最优路径,能避免路边建筑物的屏蔽效应,改善信道条件;动态评估道路上的车流密度,选择可靠性最高的传输路径,能很好地降低传输时延,提高网络吞吐能力。     

一种基于竞争转发的城市场景车载 Ad Hoc网络路由算法

 论文提出了一种适用于城市场景下的基于竞争转发的车载Ad hoc网络路由算法,算法摒弃了HELLO消息的使用,利用分布式的竞争策略根据邻居节点所处的地理位置信息进行下一跳节点的选择.数据转发使用选定点路由同时利用了实时的道路交通信息和网络拓扑结构信息进行选定点选择.采取暂存转发策略处理网络分割现象.仿真结果表明该算法比其他类似算法具有更高的数据包递交率和较低的数据延迟.     

基于智能决策的移动Ad Hoc网络IDS模型

近几年,入侵检测在网络安全领域显得极为重要,尤其是在移动AdHoc网络安全领域更是如此。介绍了入侵检测技术及其分类,指出了在移动AdHoc网络中设计应用入侵检测系统所面临的挑战。为应对这些挑战,提出了一种新颖的入侵检测系统模型,并阐述了它的结构和工作原理。     

基于车载自组织网络的消息发送时机研究

车载自组织网络(VANET)是一种节点迅速移动的无线自组织网络,网络的动态密度变化具有明显的特征,呈现出疏密相间的"手风琴"现象。利用汽车之间相遇的机会进行通信需要考虑到网络动态变化对传输的影响。文章利用仿真软件SUMO生成的跟踪轨迹文件,在仿真软件ONE下做网络参数的对比实验。通过模拟道路交通的网络动态密度变化,文章得到结论:最佳发送时机随网络参数不同而变化。