共查询到19条相似文献,搜索用时 109 毫秒
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预测式快速移动IPv6协议(Proactive FMIPv6)需要依靠链路层(L2)触发来进行预切换从而实现平滑切换,然而虚报L2触发以及移动节点(MN)乒乓运动的存在将严重影响Proactive FMIPv6的切换性能。考虑到在每天重复的日常生活中MN往往具有运动轨迹明确、运动时间相对固定等特点,提出一种基于时间加权的数据挖掘算法的FMIPv6切换方案(TWP-FMIPv6),通过时空数据挖掘机制对时间加权的MN移动历史记录进行移动规则挖掘并预测MN的下一个移动位置,代替Proactive FMIPv6协议中的L2预测触发从而避免虚报L2触发现象。仿真实验结果表明,TWP-FMIPv6能充分利用MN的移动特点进行高准确度的切换预测,减少切换延时和分组丢失率,提高切换效率。 相似文献
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快速移动IPv6(FMIPv6)协议是改进移动IPv6(MIPv6)协议性能的增强型协议之一,但是由于链路层触发原语的限制,性能提升十分有限。文章在介绍802.21媒介独立性切换的基础上,通过增加新的原语和参量,提出了一种基于媒介无关切换(MIH)方法来改进快速移动IPv6性能的方案。 相似文献
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移动IPv6网络中的切换策略研究 总被引:2,自引:0,他引:2
在未来基于IPv6技术的宽带移动网络中,移动主机的IP层切换策略是保证实时业务服务质量的关键问题之一。论文首先分析和比较了在Internet工程任务组(IETF)中三个主要的移动IPv6网络中的切换策略,在此基础上深入研究了将快速切换协议应用于分级移动IPv6网络的方案,并对此进行了仿真。仿真结果表明,该方案可以提高移动用户IP层切换的性能,能改善实时业务的服务质量。 相似文献
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移 动 IPv6 标准切换包括移动 节点的二层切换、路由发 现、重复地址检测(DAD)、家 乡代理绑定更新(BU)、通信节 点绑定更新这几个环节,在此期 间移动节点不能收发应用的 IP 分 组。在无线链路质量不佳,或者 家乡代理与移动节点距离遥远等 情况下,标准切换过程引起的分 组传输延时和分组丢失无法满足 实时业务的要求。 移动 IPv6 的快速移动切换 研究是当前的一个热点,IETF 对 此提出了移动 IPv6 快速移动切换(FMIPv6)草案。FMIPv6 利用移 动节点或网络的二层链路信息, 对移动切换事件进行预测或快速 响应,通… 相似文献
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《信息通信》2019,(12)
随着互联网技术与移动通信技术飞速发展,移动IPv6技术已经成为下一代移动互联网的研究热点。切换技术是影响移动互联网实时运行质量的重要技术之一。低延迟、低丢包的无缝切换方案对移动IPv6的性能至关重要。层次移动IPv6(HMIPv6)利用移动锚点(MAP)降低了延迟和数据丢失。然而,只有移动节点在同一MAP域的网络上进行切换时,HMIPv6才能有效减少延迟。当移动节点在不同MAP域的网络移动时,其切换性能并不优于标准移动IPv6。文章针对层次移动IPv6提出了一种增强切换方案(EHMIPv6),该方案在HMIPv6的基础上实现并行重复地址检测(PDAD),以减少不同区域网络间切换的延迟。分析表明,该方案比HMIPv6具有更好的性能。 相似文献
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移动IPv6切换技术 总被引:1,自引:1,他引:0
基本的移动IPv6切换时延太大,无法满足实时业务的要求。文章在分析了现有移动IPv6网络切换技术的基础上,提出了一种基于分层移动IPv6网络模型的快速切换方案F-HMIPv6。该方案实现了移动节点在不同移动锚点域移动的快速切换操作。从理论分析得出结论,该方案可以弥补现有移动IPv6网络切换技术中的一些缺陷。 相似文献
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本文主要对这几种移动IP技术进行描述,然后在NS-2(一种开放源码的网络模拟工具)仿真平台下设定一定的切换场景进行仿真实现,对这几种协议进行切换时延和切换期间丢包数量的比较. 相似文献
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提出一种在无线移动环境下保障用户通信服务质量的资源预留扩展方案。该方案有效地利用了FMIPv6(Fast Handovers for Mobile IPv6)的工作过程,通过扩展FBU(Fast Binding Update)和HI(Handoff Initiate)消息,使其能够携带QoS(Quality of Service)对象,从而将移动管理和资源预留两个过程合并为一个过程。该方案引入了提前预留与公共路径利用等一系列新机制。分析结果表明,在无线移动环境下该方案能够有效地降低预留重建延迟,提高了链路资源的使用效率。 相似文献
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Henrik Petander Eranga Perera Aruna Seneviratne 《Wireless Personal Communications》2007,43(3):945-958
In the future, mobility support will require handling roaming in heterogeneous access networks. In order to enable seamless
roaming it is necessary to minimize the impact of the vertical handoffs. Localized mobility management schemes such as Fast
Handovers for Mobile IPv6 (FMIPv6) and Hierarchical Mobile IPv6 do not provide sufficient handoff performance, since they
have been designed for horizontal handoffs. In this paper, we propose the SafetyNet protocol, which allows a Mobile Node to
perform seamless vertical handoffs. Further, we propose the SafetyNet handoff timing algorithm, to enable a Mobile Node to
delay or even completely avoid upward vertical handoffs. We implement the SafetyNet protocol and compare its performance with
the FMIPv6 protocol in our wireless test bed and analyze the results. The experimental results indicate that the proposed
SafetyNet protocol can provide an improvement of up to 95% for TCP performance in vertical handoffs, when compared with FMIPv6
and an improvement of 64% over FMIPv6 with bicasting. We use numerical analysis of the protocol to show that its over the
air signaling and data transmission overhead is comparable to FMIPv6 and significantly smaller than that of FMIPv6 with bicasting. 相似文献
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Fast Handover in Hierarchical Mobile IPv6 Based on Motion Pattern Detection of Mobile Node 总被引:1,自引:1,他引:0
To meet the increasing communication requirement for people in ubiquitous environments, some handover schemes and improvements
were proposed by the IETF in order to support mobility effectively. FHMIPv6 combines the advantages of FMIPv6 and HMIPv6.
This paper proposes an improved scheme based on FHMIPv6 which mainly implements a combined-detection function between Mobile
Node (MN) and Mobility Anchor Point (MAP) and calculates the Normalized Edit Distance to analyze the motion trail and estimate
the motion pattern of MN. According to the estimating result, MAP determines the way MN attaches to the new access point so
as to reuse some previous handover information and intellectualize the handover process to avoid redundant binding updating.
Simulation results based on Network Simulation 2 (NS2) show that this improved scheme can reduce the packet’s loss rate and
handover latency, enhance the throughput and improve the network performance as a whole, especially for MN with the Ping-Pong
motion pattern. 相似文献
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Neng-Chung Wang Yung-Kuei Chiang Ji-Shuen Wong 《Wireless Personal Communications》2014,75(4):2181-2200
The research and development of next generation networks results in continuously growing in heterogeneity of wireless systems. Those systems also offer users the increasing possibility of roaming between different networks, which undoubtedly needs seamless integration. As mobile users continue to expand their requirements for seamless roaming, a good handoff mechanism is necessary especially for cellular networks and wireless local area networks. The most critical problem faced in the handoff mechanism is that users may need immediate data transmission. However, immediate data transmission is always obstructed because handoff latency occurs. In this paper, we propose a Hierarchical Mobile IPv6 handoff scheme using active measurement-foreign mobility agent to measure the residual bandwidth of each access point (AP) for handoff decision. As a result, the proposed scheme prevents whole efficiency from being affected by the registration time and improves immediate data transmission. In addition, a dual-threshold of the received signal strength is used to avoid the ping-pong effect. Simulation results show that the proposed scheme outperforms the traditional Mobile IPv6 and enhanced multilayer Hierarchical Mobile IPv6. 相似文献
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由于移动节点的位置是不断变化的,移动IPv6协议给出了支持移动节点的远程加入和双向隧道两种组播方法,但这两种方法都有各自的缺点.本文提出基于移动预测的快速分层移动组播体系结构(mobility prediction based fast and hierarchical mobile multicast architecture,简称MP-FHMM),通过移动预测,在切换前为移动节点配置好切换信息,并且在切换时使用基于FMIPv6改进的快速组播切换方法,有效减少了切换延迟以及由此引发的组播数据分组丢失.另外,由于采用层次型结构的移动组播管理,屏蔽了节点在子网内的移动,减少了因节点移动而重构组播树的频率. 相似文献
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基本的移动IPv6(MIPv6)切换延迟非常大,不能满足实时业务的要求。本文基于对MIPv6的切换时延的分析,提出了一种IEEE802.11无线局域网环境下MIPv6的低时延切换方法,该方法通过结合使用连接触发器和快速路由器公告,并通过IP地址与MAC地址的映射机制来优化切换过程。仿真结果表明,该方法能够有效降低节点切换过程的时延,同时其性能优于以往相关的工作。 相似文献