共查询到19条相似文献,搜索用时 171 毫秒
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针对目前移动自组网路由协议的研究,主要以NS2等网络仿真工具为实验手段的不足,本文详细介绍了在Linux平台上,使用无线网络接口,设计移动自组网AODV路由协议,为进一步研究移动自组网的相关性能,提供平台基础。 相似文献
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无线自组网是由一组无线移动主机组成的无基础设施的临时网络,在与其相关的网络协议的研究中常涉及到修改及扩展问题。文章分析了经典按需路由协议AODV的路由发现和建立过程,通过NS2仿真软件的内核扩展及重编译,在控制台输出相关的扩展内容,包括RREQ和RREP包的传送、正反向路由表的建立和节点路由表的更新等信息。结果表明,在NS2仿真软件下对无线自组网路由协议的研究和调试分析是一种科学有效的方法。最后对AODV协议本身提出了几种改进的思路和方法。 相似文献
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多径路由协议AOMDV的改进与性能分析 总被引:1,自引:0,他引:1
移动无线自组网是一种移动多跳无线网络,有效的路由算法是关键。由于移动自组网的移动性,会使得无线自组网按需多径距离矢量路由(AOMDV)协议的活动路由不再是最短路径。针对此不足,提出了改进方法:构建两跳路由,然后利用两跳路由信息对活动路由进行动态优化,使路径更短。NS一2仿真结果表明,改进的AOMDV协议在路由发起频率、端到端平均时延、归一化路由开销和数据分组投递率等方面的性能均比AOMDV效果好。 相似文献
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基于NS的Ad hoc网络路由协议仿真研究 总被引:1,自引:1,他引:0
运用NS2网络仿真模拟软件对Ad hoc移动自组网络三种典型路由协议DSDV、DSR、AODV在不同网络拓扑复杂度环境下进行仿真模拟,提取部分仿真数据进行分析,从数据包发送率、端到端延时、路由开销三个方面综合比较Ad hoc网络三种典型路由协议的优缺点;引入NS2节点能量模型,分析仿真过程中节点能量变化。仿真结果表明,随着网络拓扑复杂性的增加,AODV路由协议较其它两种路由协议更具可行性与有效性。 相似文献
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多跳无线移动Ad Hoc网络路由协议的研究分析 总被引:6,自引:2,他引:6
无线移动Ad Hoe网络(MANET)作为可移动分布式多跳无线网络,没有预先确定的网络拓扑或网络基础设施以及集中控制.为了在如此的网络中促进通信,路由协议主要用于在节点之间发现路径.Ad Hoe网络路由协议的主要目的是网络拓扑的动态变化、任意两个节点之间建立一个使得通信总费用和带宽消费最少的正确和有效的通信路径.描述了设计移动Ad Hoe网络路由协议所面临的问题以及对它们的评价,详细比较了七种典型无线移动AdHoe网络路由协议的特性和功能,即DSDV,CGSR,WRP,AODV,DSR,TORA和ABR,为进一步的研究提出了新的课题. 相似文献
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Mobile Ad hoc Network (MANET) possesses unique characteristics which makes it vulnerable to security threats. In MANET, it is highly challenging to protect the nodes from cyberattacks. Power conservation improves both life time of nodes as well as the network. Computational capabilities and memory constraints are critical issues in the implementation of cryptographic techniques. Energy and security are two important factors that need to be considered for improving the performance of MANET. So, the incorporation of an energy efficient secure routing protocol becomes inevitable to ensure appropriate action upon the network. The nodes present in a network are limited due to energy constraints and secure communication protocols. Hence, the current study proposed an energy-efficient defense scheme using swarm intelligence approach. The functioning of the proposed method was validated under NS2 simulation. The experimental results confirmed that the proposed work outperformed existing methods in terms of packet delivery ratio, average end-to-end delay and throughput. 相似文献
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为改善大规模自组织网络中的通信质量,介绍了一种基于P2P(peer-to-peer,P2P)计算模式的新型MANET路由模型——SPDSR (structured peer computing based dynamic source routing)[1].根据移动自组网和对等网络的特点,对结构化P2P覆盖层网络技术应用到移动自组织网络路由中的可行性及原理进行了说明,在此基础上设计实现了该算法.最后通过NS2仿真工具对新协议进行了仿真,并与其他协议进行比较.实验结果表明,新协议在大规模网络中的性能优于其它协议,具有较强的可扩展性,研究结果为改善大规模网络的通信质量提供了可行的解决方案. 相似文献
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MANET路由协议一直是国内外学者的研究热点,但仿真验证却影响了科研工作者研究的进度。引入一种新的网络仿真平台J-Sim。在J-Sim下,对MANET中具有代表性的两种路由协议(AODV、GPSR)进行性能仿真,实验结果表明J-Sim可以真实的仿真MANET的运行,获取有价值的仿真结果。 相似文献
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Mahmoud Al-shugran Osman Ghazali Suhaidi Hassan Kashif Nisar A. Suki M. Arif 《Journal of Network and Computer Applications》2013,36(2):887-897
The Mobile Ad Hoc Network (MANET) is wireless network which provides communication among wireless mobile hosts without the need of any standing network infrastructure. In such networks, and to facilitate communication between participating nodes, every node has to offer routing services. Routing in MANET is responsible for selecting and forwarding packets along optimal paths. Finding an optimal route is a crucial task in MANET where routes tend to be multi-hop. Many routing protocols have been proposed in literature. However, few of them are efficient when the network is sparse and highly dynamic. Position-based routing and forwarding provides the opportunity for improving the efficiency and performance of the existing MANET routing strategies. This research work presents an extensive overview of geographic forwarding techniques in MANET. In particular, it focuses on the presentation of the basic operation mode of geographic forwarding, which is greedy forwarding. Meanwhile, this research work presents a qualitative evaluation of the most current and popular greedy forwarding strategies used with position based routing protocols. Furthermore, the findings have been used to conclude the most appropriate unicast forwarding policy for future research efforts. 相似文献
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Wireless Networked Control Systems (WNCS) are used to implement a control mechanism over a wireless network that is capable of carrying real-time traffic. This field has drawn enormous attention from current researchers because of its flexibility and robustness. However, designing efficient WNCS over Mobile Ad Hoc Networks (MANET) is still a challenging topic because of its less-predictable aspects, such as inconsistent delay, packet drop probability, and dynamic topology. This paper presents design guidelines for WNCS over MANET using the Network Simulator version 2, NS2 software. It investigates the impact of packet delay and packet drop under the AODV and DSR routing protocols. The simulation results have been compared to MATLAB results for validation. 相似文献