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针对车辆自组织网络提出了基于地理信息系统的路由协议GBRP,以此来解决节点高速移动而引起的路径重建问题.由于利用了地理信息系统中提取的道路空间信息,该协议可以规避城市环境下车辆自组织网络中存在的固定的或者暂时的拓扑空洞问题.仿真实验结果表明新的路由协议与DSR相比有较高的分组传输率,较低的路由开销,协议扩展性更好,更适合于城市环境下的车载通信. 相似文献
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随着信息技术信息网络化构建越来越频繁,车辆与车辆或者是车辆与路边通信站之间的有效联系,车载自组织网络也开始得到发展。从现实效应来看,车载自组织网络的出现,极大地方便了车辆间和车辆与道路通信站之间的联系,具有非常强的现实意义。为了提高该技术的利用效率,强化车载自组织网络路由协议分析具有重要的价值。本文就车载自组织网络路由协议进行分析,旨在深化技术研究,提高技术利用率。 相似文献
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随着信息技术和网络技术的不断发展,现代社会的信息网络化构建越来越频繁,为了实现车辆与车辆或者是车辆与路边通信站之间的有效联系,车载自组织网络也开始得到发展。从现实效应来看,车载自组织网络的出现,极大地方便了车辆间和车辆与道路通信站之间的联系,具有非常强的现实意义。为了将这种技术进行推广,也为了提高此类技术的利用效率,强化车载自组织网络路由协议的分析具有重要的价值。本文就车载自组织网络路由协议进行分析,旨在深化技术研究,提高技术利用率。 相似文献
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车载自组织网络(VANET)是一种新型移动自组织网络。作为移动无线网络的热点研究领域,车载自组织网络的间歇连通性使路由设计充满挑战。首先阐述了车载自组织网络的主要特征和应用;在对车载网络路由协议进行分类的基础上,详细描述了一批有代表性的路由协议;对比和总结了各类路由协议的特点,并提出相关研究建议,可为车载网络路由协议研究提供一定的参考价值。 相似文献
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车载自组织网络( VANET)是一种新型移动自组织网络。作为移动无线网络的热点研究领域,车载自组织网络的间歇连通性使路由设计充满挑战。首先阐述了车载自组织网络的主要特征和应用;在对车载网络路由协议进行分类的基础上,详细描述了一批有代表性的路由协议;对比和总结了各类路由协议的特点,并提出相关研究建议,可为车载网络路由协议研究提供一定的参考价值。 相似文献
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本文简述了无线自组织网络的主要特征,详细介绍了自组织网络常用的路由协议,对一种实用自组织网络的路由选择进行了分析研究,并给出了针对该实用自组织网络中不同类型的通信链路所采用的路由协议及相应的路由选择算法。 相似文献
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无线传感器网络路由协议研究分析 总被引:4,自引:0,他引:4
无线传感器网络与传统网络不同,有其自身的特殊性,不能采用传统的路由方式.分析了无线传感器网络的特点,重点阐述无线传感器网络中有代表性的路由协议,并分析各种协议的优缺点.通过详细比较各种协议,总结无线传感器网络现有路由协议存在的问题,并展望无线传感器网络路由协议未来的研究方向和发展趋势. 相似文献
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Dave Cavalcanti Carlos Cordeiro Anup Kumar Dharma P. Agrawal 《Wireless Communications and Mobile Computing》2007,7(3):375-397
A growing need to have ubiquitous connectivity has motivated our research to provide continuous connection between various wireless platforms such as cellular networks, wireless local area networks (WLANs), and mobile ad hoc networks (MANETs). In this paper, we consider integration at the routing layer and propose two adaptable routing protocols (IRP‐RD and IRP‐PD) that exploit topology information stored at the fixed network components (cellular base stations and WLAN access points) for the route discovery and maintenance processes. Our proposed protocols can provide connectivity to the cellular network and/or WLAN hotspots through multihop routing, while differ in the gateway discovery approach used. In IRP‐RD, multihop routes to gateways to the cellular network or WLAN hot spots are discovered on demand, while in IRP‐PD out of coverage users proactively maintain routes to the gateways. Furthermore, proposed protocols can be used in any heterogeneous scenario, combining a cellular network and WLANs operating in infrastructure or ad hoc (MANET) mode. We provide simulation results that demonstrate the effectiveness of the proposed integrated routing protocols and show the advantages and drawbacks of each gateway discovery approach in different heterogeneous scenarios. Copyright © 2006 John Wiley & Sons, Ltd. 相似文献
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In this paper, we present a new quality of service (QoS) routing protocol for mobile ad hoc networks (MANETs). Most of the existing routing protocols assume homogeneous nodes in MANETs, i.e., all nodes have the same communication capabilities and characteristics. However, in many ad hoc networks, nodes are not the same. Some nodes have longer transmission range, larger transmission bandwidth, and are more reliable and robust than other nodes. We take advantage of the non-homogeneous property to design more efficient QoS routing protocol. And node location information is used to aid routing. We also develop a new algorithm to calculate end-to-end bandwidth for a given path. Our QoS routing protocol contains end-to-end bandwidth calculation and bandwidth reservation. QoS route is discovered and setup only when it is needed. Extensive simulation studies demonstrate the good performance of the QoS routing protocol. 相似文献
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分析研究了移动Adhoc网络(MANET)的可靠多路径路由协议,可靠多路径路由协议的主要目标是提供可靠的通信、以确保负载平衡以及提高服务质量(QoS)。本文分析了Adhoc网络多路径路由技术的研究进展,论述了典型的Adhoc网络多路径路由协议性能,最后对Adhoc网络多路径路由的发展趋势进行了展望。 相似文献
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Efficient routing and medium access control (MAC) are very important for Mobile Ad hoc Networks (MANETs). Most existing routing
and MAC protocols consider homogeneous ad hoc networks, in which all nodes are modeled as the same, i.e., they have the same
communication capabilities and characteristics. Although a homogeneous network model is simple and easy to analyze, it misses
important characteristics of many realistic MANETs such as military battlefield ad hoc networks. In addition, a homogeneous
ad hoc network suffers from poor performance and scalability. In many ad hoc networks, multiple types of nodes do co-exist;
and some nodes have larger transmission power, higher transmission data rate, and better processing capability, are more reliable
and robust than other nodes. Hence, a hybrid network model is more realistic and provides many advantages for designing better
routing and MAC protocols. In this paper, we present a new routing protocol called Hybrid Routing, which is specifically designed
for hybrid MANETs. In addition, a novel MAC protocol is jointly designed for hybrid MANETs. Extensive simulations demonstrate
that the proposed routing MAC protocols have very good performance.
相似文献
Dapeng Wu (Corresponding author)Email: URL: http://www.wu.ece.ufl.edu |
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POSITION VERIFICATION APPROACHES FOR VEHICULAR AD HOC NETWORKS 总被引:1,自引:0,他引:1
Intervehicle communication is regarded as one of the major applications of mobile ad hoc networks (MANETs). Compared to MANETs, these so-called vehicular ad hoc networks (VANETs) have special requirements in terms of node mobility and position-dependent applications, which are well met by geographic routing protocols. Functional research on geographic routing has already reached a considerable level, whereas security aspects have been vastly neglected so far. Since position dissemination is crucial for geographic routing, forged position information has severe impact regarding both performance and security. In this work, we first analyze the problems that may arise from falsified position data. Then, in order to lessen these problems, we propose detection mechanisms that are capable of recognizing nodes cheating about their location in position beacons. In contrast to other position verification approaches, our solution does not rely on special hardware or dedicated infrastructure. Evaluation based on simulations shows that our position verification system successfully discloses nodes disseminating false positions and thereby widely prevents attacks using position cheating 相似文献
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In order to avoid transmission collisions in mobile ad hoc networks (MANETs), a reliable and efficient medium access control (MAC) protocol is needed. Vehicular MANETs (VANETs) have vehicles as network nodes and their main characteristics are high mobility and speed. Active safety applications for VANETs need to establish reliable communications with minimal transmission collisions. Only few MAC protocols designed for MANETs can be adapted to efficiently work in VANETs. In this article we provide a short overview on some MANET MAC protocols, and then we summarize and qualitatively compare the ones suited for VANETs 相似文献
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Vehicular ad hoc networks (VANETs) have attracted much research attentions in the recent years. Although there are many outstanding solutions of geographic routing designed for the VANETs, only one or two features of the VANETs have been specifically utilized in each of the proposed solutions. In this paper, we propose a novel adaptive fuzzy multiple attribute decision routing (AFMADR) scheme, by which a packet carrier is supposed to be a decision maker in the selection of a target for the next hop transmission with more factors to be considered. The AFMADR scheme consists of four steps. Firstly, the candidate vehicles are characterized by four attributes including the distance, the direction, the road density, and the location to obtain a fuzzy attribute score of each attribute. Secondly, according to the real‐time conditions of the candidates' attributes, weights of attributes will be calculated by the proposed adaptive weight algorithm, which makes the AFMADR scheme more scalable and robust in different VANET scenarios. Then, a fuzzy performance score will be produced for each candidate based on the fuzzy attribute score and their real‐time weights. Lastly, a route decision is made by choosing a candidate with the highest performance score as the target for the next hop transmission. We carry out simulation experiments to compare the performance of the AFMADR scheme with the existing well‐known geographic routing protocols for the VANETs. The simulation results demonstrate that the proposed AFMADR scheme can achieve the best performance in terms of the highest delivery ratio and the lowest delivery delay with a reasonable number of hops among all protocols in all the simulation scenarios. Copyright © 2015 John Wiley & Sons, Ltd. 相似文献
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This paper evaluates the tradeoffs involved in using directional antennas in ad hoc routing. Although problems with utilizing directional antennas have been visited in the past, the research has been confined mostly to medium access control. To determine whether directional antennas are beneficial to ad hoc networks, it is necessary to evaluate the impact of directional antennas on the performance of routing protocols as well. In this paper, we evaluate the performance of DSR (dynamic source routing) using directional antennas. We identify several issues that emerge from executing DSR (originally designed for omnidirectional antennas) over directional antennas. Using insights gained from simulations, we propose routing strategies that adapt the routing protocol to directional communication. Our analysis shows that by using directional antennas, ad hoc networks may achieve better performance. However, scenarios exist in which using omnidirectional antennas may be more appropriate. 相似文献
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车载网VANETs(Vehicular ad hoc networks)属于高速移动的无线网络,可供车辆安全、交通监测以及其他的商业服务的应用。然而,为此,提出混合式的位VANETs中车辆的快速移动导致通信链路频繁地断裂,增加路由开销,降低了可扩展性。议地理位置路由的特点。HLAR(Hybrid location-based ad hoc routing)。HLAR结合了反应式路由、HLAR克服了反应式路由的扩展性问题,并改善了地理位置路由对位置误差的敏感性。同时,通过理论分析,量可扩展性,并推导了路由开销的表达式。通过分析、仿真表明,提出的路由协议具有很好的扩展性,并降低了路由开销。在仿真中引入位置误差因子,结果表明。同时,与同类的其他协议相比,输时延方面HLAR到对位置误差具有很强的鲁棒性HLAR在数据传输率、端到端传提升。 相似文献