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移动Ad Hoc网络的安全路由协议研究 总被引:2,自引:0,他引:2
ad hoc网络是一种新型的无线移动网络,因其独特的组网特性,使得安全问题成为其发展的最大束缚。路由协议的安全是自组网安全的一个重要部分。本文首先论述移动AdHoc网络中的安全问题,介绍了多种安全路由的协议和方案,并对其中的三种按需安全路由协议进行了比较,最后提出进一步研究AdHoc网络路由安全应注意的问题。 相似文献
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移动无线Ad Hoc网络的路由安全 总被引:2,自引:0,他引:2
Ad Hoc是特定的无线网络结构,它强调多跳、自组织、无中心的概念。MANET(mobile ad hoc network)被认为是最有希望的下一代Ad Hoc解决方案。MANET网络是具备相互通信能力无线移动节点的集合,这些节点没有固定的网络结构,也没有限定到类似基站或移动交换中心这样的中心控制部 相似文献
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移动Ad Hoc网络研究与发展现状 总被引:29,自引:4,他引:25
本文简要介绍移动ad hoc网络发展的历史、理论和技术上的一些热点问题,以及它的一些应用,从而给读者一个概括性的了解,为进一步学习和研究移动ad hoc网络奠定一些基础。为了便于读者跟踪国外先进的研究成果,本文最后介绍了一些在这一领域比较活跃的研究机构以及他们的主要工作。 相似文献
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移动Ad Hoc网络是一个自组织系统,是由许多无线移动主机组成的一个临时动态网络,且不依赖于任何中心化的接入点和网络基础设施。对于这样一个网络,一个有效的路由协议对于适应主体的移动性以及为可能的链路提供可行的数据传输是非常必要的。限定路由协议的因素可归为两类,即无线传输过程中的衰退作用和网络拓扑的边缘效应。现存的各种路由协议着重从不同的角度来实现各自的功能。路由协议可分为两部分,路由发现和路由维护,而路由发现是其中的关键部分。 相似文献
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移动Ad Hoc网络MAC协议综述 总被引:2,自引:0,他引:2
移动AdHoc网络(MANET)是移动节点自组织网络,由于特殊的应用环境成为现今研究的热点。文章对MANET物理信道的特点作了描述并对其MAC协议进行了归类和详细介绍,同时分析了各种协议的优缺点,最后对整个领域及未来的研究方向作了简要的总结和说明。 相似文献
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Ad Hoc网络技术浅析 总被引:7,自引:0,他引:7
Ad Hoc网络是随着无线通信技术的快速发展而出现的一种新型网络。本文详细介绍了Ad Hoc网络的概念、特点、应用需求、与其他移动通信系统的区别和网络管理等方面的问题。 相似文献
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基于OPNET仿真平台,通过考察节点移动速度、节点移动暂停时间、节点密度和发包间隔对路由协议性能的影响,全面地研究了移动AdHoe网络中典型路由协议的性能。为了公平地对比按需驱动类路由协议和表驱动类路由协议,采用了归一化路由负载作为路由开销的性能指标,最后对3个方面的路由协议性能进行对比和分析。结果表明,仿真结果和理论分析是相符的,因此采用的方法是正确的。 相似文献
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Ad Hoc网络中MAC协议的研究是一个全新的领域,正逐步受到人们的关注。在移动Ad Hoc网络中,有时会有多个无线设备同时接入信道,从而导致分组之间发生矛盾,致使接收机无法辨认接收到的数据资料,出现信道资源浪费的现象。 相似文献
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在移动自组织网络中,基于移动节点地理位置辅助信息,提出了一种新的泛洪算法——位置辅助泛洪改进算法(ILFA),ILFA通过节点位置信息重传广播分组并有效控制网络流量。此外,将ILFA应用于经典MANET源路由(dynamic source routing,DSR)协议中,通过限定请求区域和期望区域等限制路由发现的有效范围,进而通过设置提名广播重传邻居列表限定路由请求分组重传范围,有效减小DSR路由寻路分组的传播次数。仿真结果证明,和传统泛洪方案相比,ILFA能够有效减小DSR路由协议的路由开销并提升MANET吞吐量。 相似文献
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Geocasting is a variation on the notion of multicasting. A geographical area is associated with each geocast, and the geocast is delivered to the nodes within the specified geographical area. Thus, geocasting may be used for sending a message that is likely to be of interest to everyone in a specified area. In this paper, we propose three geocasting protocols for ad hoc networks, obtained as variations of a multicast flooding algorithm, and then evaluate these approaches by means of simulations. Proposed geocasting algorithms attempt to utilize physical location information to decrease the overhead of geocast delivery. 相似文献
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Due to unpredictable topology change and frequent link failure, it becomes evident major challenge to provide the stable route between source and destination in mobile ad hoc networks. Unlike previous multipath routing schemes for redundancy and unicast routing protocol utilizing the longest route expiration time measured by geographical information supported by Global Positioning System (GPS), we develop a framework to establish the most stable route based on measured frequency of link failure, available battery as well as the number of actual connections. To evaluate performance of proposed scheme, we provide practical simulation results for multipath and unicast routing protocol in terms of packet delivery ratio, control overhead, average hop length as well as end-to-end delay. Through analysis of simulation results, we demonstrate that our scheme shows better performance than general unicast routing protocol as well as similar packet delivery ratio to multipath routing protocol with less maintenance overhead.
Ki-Il Kim received the M.S. and Ph.D. degrees in computer science from the Chungnam National University, Daejeon, Korea, in 2002 and 2005, respectively. He is currently with Department of Information Science, Gyeongsang National University as a faculty member. His research interests include routing for MANET, QoS in wireless network, multicast, and sensor networks.
Sang-Ha Kim received the B.S. degree in chemistry from Seoul National University, Seoul, Korea, in 1980. He received the M.S. and Ph.D. degrees in quantum scattering and computer science from the University of Houston, Houston, TX, in 1984 and 1989, respectively. From 1990 to 1991, he was with the Supercomputing Center, SERI, Korean Institute of Science and Technology (KIST) as Senior Researcher. He joined Chungnam National University, Daejeon, Korea, in 1992, where he is a Professor. His current research interests include wireless networks, ad hoc networks, QoS, optical networks, and network analysis. 相似文献
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为了提高移动Ad Hoc网信道利用率和吞吐量、克服隐藏终端问题,使用定向天线的信道接入(MAC)协议已被提出。本文介绍了基于移动Ad Hoc网的定向MAC协议,分类描述了四种定向MAC协议(全向RTS-全向CTS协议、定向RTS-全向CTS协议、定向RTS一定向CTS协议以及多跳RTS协议),比较分析了其特点并指出了现有协议中存在的一些问题及今后可能的研究方向。 相似文献
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MANET路由协议的节能策略 总被引:3,自引:0,他引:3
移动节点之间利用无线链路连接,每条链路的存在依赖于一定的发射功率。由于主机是电池供电的,这限制了主机的存活时间。为了进行有效的通信,并尽可能延长网络的可操控时间,就必须在节点间建立节能有效的路由。重点讨论MANET中路由中的能量策略。 相似文献
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This paper deals with the problem of Location Management in mobile ad hoc networks where users are organized in groups. In the following this type of systems are referred to as Mobile Ad hoc Networks for Group Operations (MANGO). This paper proposes a framework for location management which exploits the trend of mobile users to spontaneously form groups in MANGOs. The management procedures required to support such spontaneous groups, which are by nature dynamic, are introduced as well. The proposed spontaneous group management is based on a hierarchical location database architecture and the concept of Group Leader, which is a terminal responsible for the location update of a group of terminals. Objective of the proposed framework is minimizing the burden on location databases and, at the same time, the signaling issued by terminals. In this paper, distributed operations required to support the whole framework are properly introduced and described. Simulation experiments have been run in order to assess the proposed scheme. Performance results show that the introduced methodology allows reduced signaling and location updating. 相似文献
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Performance of Multipath Routing for On-Demand Protocols in Mobile Ad Hoc Networks 总被引:25,自引:0,他引:25
Mobile ad hoc networks are characterized by multi-hop wireless links, absence of any cellular infrastructure, and frequent host mobility. Design of efficient routing protocols in such networks is a challenging issue. A class of routing protocols called on-demand protocols has recently found attention because of their low routing overhead. The on-demand protocols depend on query floods to discover routes whenever a new route is needed. Such floods take up a substantial portion of network bandwidth. We focus on a particular on-demand protocol, called Dynamic Source Routing, and show how intelligent use of multipath techniques can reduce the frequency of query floods. We develop an analytic modeling framework to determine the relative frequency of query floods for various techniques. Our modeling effort shows that while multipath routing is significantly better than single path routing, the performance advantage is small beyond a few paths and for long path lengths. It also shows that providing all intermediate nodes in the primary (shortest) route with alternative paths has a significantly better performance than providing only the source with alternate paths. We perform some simulation experiments which validate these findings. 相似文献