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本文在AODV路由协议的基础上提出了一种基于无环替代(LFA)的前摄性重路由机制,旨在提高无线Mesh网络的快速自愈的能力.文中首先介绍了AODV的改进AODV备份路由协议,并指出AODV备份路由协议的不足,然后提出了基于无环替代的AODV路由算法AODV-LFA,最后通过NS仿真实验,比较了AODV、AODV备份路由和AODV-LFA的丢包率、端到端时延等,表明AODV-LFA具有更强的自愈能力. 相似文献
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介绍了传统的平面Ad hoc路由协议,包括先验式和主动式路由协议;概述了针对Ad hoc的特殊网络特点的路由协议,主要是基于能量和基于QoS的Ad hoc路由协议并分析了针对AODV改进的协议—Ant-AODV和健壮型AODV。 相似文献
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0引言
传统无线网络中的代表性路由协议是AODV(ad hoc on—demand distance vector routing)路由协议,在延迟容忍网络中的代表性路由协议是EPI路由协议。传统的AODV路由协议网络主要是首先建立一条完整的链路,然后进行可靠的传输;EPI路由协议主要是通过传染把建立TCP连接的3次握手消息发送到目的节点,然后进行可靠的传输。在通常端到端延迟较大的延迟容忍网络中, 相似文献
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网络编码在无线Ad Hoc网络中有着广泛的应用前景,首先介绍网络编码在无线网络环境中的发展过程,以及网络编码在无线网络环境中的优缺点.然后在回顾AODV路由协议的基础上,采用网络编码思想对AODV路由协议进行改进,提出了一种新的路由协议NCAODV,描述了NCAODV路由协议的报文处理过程.最后采用国际上有名的NS2仿... 相似文献
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首先提出了一种新的融合AdHoe和蜂窝网络体系结构。接着在这种融合网络结构下,对传统AODV路由协议进行了改进,设计了一种蜂窝辅助的AODV路由协议(CA-AODV)。CA-AODV路由协议利用蜂窝系统中代理节点所保存的移动adhoe节点位置信息,来维护、更新节点中的路由,这种主动维护路由信息的方法从而可以提高传统AODV协议的性能。最后文中通过NS-2仿真表明:在数据发送率较高的情况下,CA-AODV路由协议能显著提高传统AODV协议的系统参数性能。 相似文献
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对Ad Hoc网络中两个典型的按需路由协议AODV和DSR可能受到的各种攻击进行分析,然后介绍一种认证式路出协议(ARAN),该协议在路由发现、路由建立和路由维护过程中使用数字证书和数字签名的方式进行路由信息的认证,有效防止可能受到的攻击。最后通过计算机仿真验证认证式路由协议预防攻击的性能。 相似文献
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Ad Hoc网络先应式路由算法(Proactive Routing Algorithm)具有寻由时延小,拓扑维护及时的优点,适合在网络负载较大的环境下高效运行.本文针对路由维护机制,以减少协议开销和寻由错误报文为目标,提出了基于Ad Hoc网络的先应式路由维护机制优化模型.通过对优化模型的相关参数讨论,得出如下结论:1.先应式路由协议的最优更新时间周期具有"逆向稳定性";2.节点数目n与更新系数h有比例关系n→h3/2.通过模型求解和仿真结果相比较,验证了模型的正确性.优化模型的研究为先应式路由算法更新机制和算法的可扩展性支持提供了理论依据. 相似文献
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This paper proposes a geographical awareness routing protocol based on a hybrid routing protocol, the Zone Routing Protocol (ZRP), in Mobile Ad Hoc Networks (MANETs). ZRP is created from combining proactive routing protocol and on-demand routing protocol; therefore, it inherits the advantages of both these routing protocols. The long delay time of the on-demand routing protocol and the huge routing overhead of the proactive routing approach are reduced in ZRP. However, ZRP still produces a large amount of redundant routing overhead in the route discovery process, which not only wastes energy but also increases the workload of the network, while limited bandwidth is a challenge for MANETs. To mitigate routing overhead, a geographical awareness approach that is applied to limit the discovered route area in ZRP is proposed and is called the Geographical awareness ZRP (GeoZRP). Simulation results confirm that the proposed algorithm alleviates routing overhead and end-to-end delay with only a slightly decrease in the packet delivery ratio. 相似文献
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This paper proposes a new routing protocol for IEEE 802.11s wireless mesh network to overcome the problems associated with the conventional proactive and reactive routing approaches. The proposed ‘Selective Greedy’ (SelG) routing protocol operates in two phases. In the first phase it exploits the proactive mode of Hybrid Wireless Mesh Protocol, the standard routing protocol for IEEE 802.11s mesh, and constructs a set of potential forwarders for every mesh point, that can act as the next-hop relay. In the second phase, during the actual data communication, a candidate is selected from the set of potential forwarders based on a local optimization. The optimization procedure considers the statistical effect of local link quality fluctuation and interference over the global routing path selection. This way the SelG protocol reduces the control packet flooding in the network (a major drawback for reactive protocols). At the same time, the optimization procedure captures the network dynamics, and thus avoids the possibility of routing based on stale information (a drawback for proactive protocols). The routing properties and the correctness of the SelG protocol is established theoretically, and the performance of the protocol is analyzed through simulation results. The proposed protocol is implemented in an indoor wireless mesh testbed, and the performance is evaluated and compared with other traditional approaches. 相似文献
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Yongfei Ye Suqin Feng Minghe Liu Xinghua Sun Ting Xu Xuming Tong 《International Journal of Wireless Information Networks》2018,25(3):348-357
In mobile Ad Hoc network, nodes move freely, this can lead to frequent changes of network topology. Routing protocol algorithm is the strategy to establish communication links for network nodes, and its performance influences the availability of Ad Hoc network directly. By using wireless channel to transmit data in Ad Hoc network, the invaded malicious nodes will cause various attacks, aim to steal the transmission data or destroy the network. Based on the traditional proactive routing protocol for Ad Hoc network, an improved safe routing strategy SDSDV is put forward to resist attacks against routing protocols. The safe proactive routing protocol includes route request and route response two stages. When the network initialization is complete, after successful identity authentication by each other, secure communication paths are established between nodes and the encrypted data will be transmission through the path. The protocol integrates distributed authentication, encryption algorithm, hash check, and other security policy together. SDSDV protocol reduces the risk of malicious manipulation of routing information and ensures the safe and reliable routing between the source and destination nodes. 相似文献
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In this article, we investigate how a service discovery protocol at the service layer in Mobile Ad Hoc Networks can be improved,
by utilizing routing information from the network layer. We consider in this article proactive routing protocols as basis
for the underlying routing mechanism, and focus on the optimization of proactive service discovery protocols. First we introduce
a general framework, enabling the cooperation of service layer and network layer, and then we propose the optimization scheme.
The performance evaluation done by simulation shows that the proposed cooperation scheme can optimize the service discovery
protocol, i.e. reduce the communication cost of service discovery, by utilizing routing table and topology information. 相似文献
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We propose and analyze an energy-aware traffic-adaptive routing strategy for large-scale mobile ad hoc networks (MANETs). Referred to as energy-aware geolocation-aided routing (EAGER), this protocol optimally blends proactive and reactive strategies for energy efficiency. Specifically, EAGER partitions the network into cells and performs intracell proactive routing and intercell reactive routing. The cell size and the transmission range are optimized analytically. By adjoining cells around hot spots and hot routes in the network, EAGER is capable of handling time-varying and spatially heterogeneous traffic conditions. 相似文献