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吕宏伟 《数字社区&智能家居》2009,(32)
移动节点在两个不同子网之间移动时将产生切换,移动节点的切换技术是保证实时业务服务质量的关键问题之一。目前,I-ETF正在开发快速切换和层次型移动IPv6来为移动IPv6提供切换机制。该文在两种技术原理基础上,提出了一些改进,最后给出了一个在层次型移动IPv6模型下的快速切换新方案。 相似文献
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移动IPv6的切换技术 总被引:7,自引:1,他引:7
移动节点在两个不同子网之间移动时将产生切换,移动节点的切换技术是保证实时业务服务质量的关键问题之一.目前,IETF正在开发快速切换和层次型移动IPv6来为移动IPv6提供切换机制.先简单介绍了移动IPv6的原理,在此基础上对移动IPv6的关键技术之一——移动节点越区切换技术作了详细的研究和分析,并给出了一个在层次型移动IPv6模型下的快速切换方案. 相似文献
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移动且不需要改变IP地址是移动IPv6的关键所在,而移动IPv6的关键技术就在移动过程中的切换。如何降低切换延时是衡量移动IPv6切换性能的标准。为此,针对移动主机在外地网络内的频繁切换已提出层次移动IPv6,用以降低时延,针对二层网络触发的切换预期已提出移动IPv6快速切换。本文提出一种以层次型移动IPv6快速切换协议(FHMIPv6)为基础的改进方案,首先针对快速切换的链路层时延引入缓存机制,然后主要针对域间切换MAP无法减少注册时延的问题,引入功能路由概念,提出最优功能路由算法,以减少切换时延和丢包率。实验分析表明,相比层次型移动IPv6快速切换方法,该方法有很大程度的改进。 相似文献
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在移动IPv6网络中,移动节点在不同子网间移动时产生切换,由此而产生的延时和丢包问题限制了移动IPv6的应用;可见,移动IPv6切换技术的研究刻不容缓.乒乓移动作为移动网络中的一种典型移动方式,对切换尤为敏感.本文在详细阐述了层次型移动IPv6快速切换的工作原理的基础上,采用模拟仿真工具NS-2模拟了基于乒乓移动的层次型移动IPv6快速切换,证明此种策略在乒乓移动情况下存在严重的通信中断.最后针对乒乓移动的特性提出一种基于限时保留地址的改进策略. 相似文献
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为了提高移动IPv6网络中组播的服务质量,提出一种动态的基于快速切换的层次型移动组播协议——DFHMM。协议设置两级组播代理,对外屏蔽节点的域内切换;利用移动锚点担当区域组播移动代理,提供配置的高灵活性和通信的强鲁棒性;使用基于链路层触发的快速切换机制,缩短组播服务的中断时间。给出了协议的体系结构、切换流程、数据结构和操作细节。 相似文献
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刘艳云 《数字社区&智能家居》2007,(9):1297-1299
当移动节点发生切换时,其切换时延和丢包率问题将严重影响实时业务的应用。针对这一问题,该文进行了理论分析并提出了一种基于地址池的层次型移动IPv6切换算法(APHMIPv6)。该算法与层次型模型相结合,采用基于地址池的有状态地址配置策略以及域间切换时利用隧道机制来提高切换性能。仿真结果表明,该算法能有效地减少移动节点切换时延和丢包率,尤其在域间切换时,性能更加显著。 相似文献
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刘艳云 《数字社区&智能家居》2007,(17)
当移动节点发生切换时,其切换时延和丢包率问题将严重影响实时业务的应用.针对这一问题,该文进行了理论分析并提出了一种基于地址池的层次型移动IPv6切换算法(APHMIPv6).该算法与层次型模型相结合,采用基于地址池的有状态地址配置策略以及域间切换时利用隧道机制来提高切换性能.仿真结果表明,该算法能有效地减少移动节点切换时延和丢包率,尤其在域间切换时,性能更加显著. 相似文献
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通过对移动IPv6(MIPv6)及其衍生机制和实际应用中网络部署的学习和研究,提出一种集成了快速分层移动(F-HMIPv6)、缓存方法和多播机制的基于多播机制的层次型网络移动IPv6切换优化方案(MMIPv6)以提高实时传输中的切换性能。运用NS-2分别对MMIPv6、MIPv6、FMIPv6和HMIPv6针对切换时延、丢包率、信令负载进行了模拟,通过对仿真结果的分析证明了MMIPv6在无缝切换速度、平滑性上都优于MIPv6、FMIPv6、HMIPv6,更适合于实时业务中的数据传输。 相似文献
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MIPv6(mobile IPv6)是IETF(Internet Engineering Task Force)工作组提出的IP层移动解决方案.切换是影响MIPv6性能的关键因素.从网络层、传输层和应用层3个层次测量分析MIPv6切换性能,确定协议层次性能相互影响与切换性能瓶颈.根据网络层切换过程,改进其测量移动检测时延的方法,测量MIPv6各个阶段的切换时延并提出减少各阶段时延的建议,分析发现切换性能瓶颈.进一步完成传输层性能测量,分析移动切换对TCP滑动窗口的影响,发现TCP的特性将影响切换过程中上层应用的性能;以FTP应用为例,测量并分析了移动切换对上层应用的影响.相关结论对设计高效的移动切换协议提供了研究基础. 相似文献
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The IEEE 802.16e standard enhances the IEEE 802.16 for the mobility support. Mobile stations can move while receiving services,
thus ongoing IP sessions may be maintained during a handover in the IEEE 802.16e. To reduce handover latency, the idea of
cross-layer handover which incorporates layer 2 handover with IP layer has been devised. Various cross-layer handover schemes
supporting fast handover in the IEEE 802.16e networks have been proposed. However, the problem of the conventional cross-layer
fast handover schemes is that they are heavily influenced by the new address confirmation latency which is the most time-consuming
procedure. In this paper, we propose an enhanced cross-layer fast handover scheme which is not susceptible to the new address
confirmation latency. Detailed performance analysis is performed in terms of the signaling costs and the handover latencies
to show the effectiveness of the proposed scheme compared with the conventional ones. The results of the performance evaluation
confirm the effectiveness of the proposed scheme. 相似文献
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In the next generation heterogeneous wireless networks, a mobile terminal (MT) with a multi-interface may have network access from different service providers using various technologies. In spite of this heterogeneity, seamless intersystem mobility is a mandatory requirement. One of the major challenges for seamless mobility is the creation of a vertical handover scheme, which is for users that move between different types of networks. In this article a seamless mobility handover scheme is presented. The novelty of the proposed scheme is that handover is fully controlled by the terminal. To improve the performance of the proposed handover scheme, a network discovery algorithm with fuzzy logic and a handover decision algorithm using multi criteria decision making (MCDM) based on vague sets are derived, which are both user-centric. With these algorithms, the handover scheme is power-saving, cost-aware, and performance-aware. Simulation results show that the novel handover scheme can perform network discovery in time to reduce handover dropping rate and present unnecessary activation of its interface to save the battery power, while effectively choose the optimum network through making trade-off among the user preference, network condition, and system performance. 相似文献
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In 5G networks, the coverage area of the base stations is smaller and the communications are at higher frequencies. The small cell concept has risen with high mobility and small coverage area. Mobile users can move among the small cells with different service requirements as a result of handover. The frequency of changing the small cell and the considered handover parameters affect the quality of service. In this paper, the handover performance analysis with different metrics and a realistic urban channel model is investigated for 5G small cells. The effect of the traditional handover metrics performance, on the 5G small cell handover procedure, is also shown. This study contributes to the research for developing new procedures on 5G small cell handover. 相似文献
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Many dual-arm handover systems suffer from low success rates since the grasps are limited to a small number of candidate grasps and handover poses. Large number increases success rate but significantly explodes combinatorics and lowers system performance. How to efficiently exploit the large number of grasps and handover poses is a difficulty faced by many dual-arm manipulation researchers. This paper uses handover heuristics and hierarchical search to. challenge the difficulty. For one thing, it samples large number of grasps and handover poses to ensure success handover. For the other, it employs the handover heuristics to reduce combinatorics and the hierarchical search to reduce search space. Leveraging these technique leads to an algorithm that has high computational efficiency and high success rate. We report the algorithm in this paper and examine its performance using both statistical simulation analysis and real-world experiments. Results show that the algorithm can deal with thousands of grasps within a few seconds using a standard PC. 相似文献
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LTE/LTE-A网络的设计为移动应用提供了较低的切换时延,但LTE标准中的切换过程仍存在一定的复杂性和安全缺陷。为了解决LTE标准和传统切换认证协议的缺陷,设计了一个基于盲签名的切换认证协议。在注册接入阶段通过盲签名建立用于切换过程的认证密钥,在切换过程中通过假名的可变换性和在特定条件下变为真名的可逆性来实现 匿名性、不可跟踪性和条件隐私保护。理论分析和仿真结果表明,相较于LTE标准和其他切换认证协议,提出的协议在满足更多安全属性的同时,有更好的性能。 相似文献