共查询到19条相似文献,搜索用时 156 毫秒
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移动节点在两个不同子网之间移动时产生切换。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。目前比较经典的三种切换机制是快速移动IPv6、层次型移动IPv6和快速层次移动IPv6。在简单介绍了三种机制原理并分析了它们的不足后,提出了一种自适应移动IPv6切换时延优化方案。 相似文献
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随着互联网和无线移动通信技术的快速发展,越来越多的用户使用移动终端接入互联网,无线移动接入技术与IPv6结合起来成为目前的研究热点。当移动主机在一个子网内移动时,对数据分组的接收几乎没有影响。但是当移动主机在两个不同的子网之间移动时,就会发生切换过程,这时己有的连接就会出现中断。切换延时过长对一些实时性的应用来说是无法接受的。为此,分析了移动IPv6三种增强协议,得出FHMIPv6在切换延时、吞吐量和丢包这几个方面表现为最优。 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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《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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针对现有的预测式FMIPv6(快速移动IPv6)没有提供域内乒乓切换机制,因而可能导致大量远程注册开销和系统通信开销的问题,在FMIPv6的基础上引入HMIPv6(分层移动IPv6)层次结构,提出了一种基于FHMIPv6(快速层次移动IPv6)的乒乓切换优化方案。分析结果表明,与FHMIPv6相比,所提方案在乒乓切换模式下能够有效减少时延和丢包率,进一步提高吞吐量。 相似文献
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本文通过对移动IPv6快速切换性能中基于分层移动的方案HMFH进行了分析,探讨了该方案的设计思路、结构层次、切换管理等,并通过性能分析,论证了这一技术在实践中的可行性和有效性。 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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In this paper, we analyze the IPv6 handover over wireless LANs. Mobile IPv6 is designed to manage mobile nodes movements between wireless IPv6 networks. Nevertheless, a mobile node cannot receive IP packets on its new point of attachment until the handover completes. Therefore, a number of extensions to Mobile IPv6 have been proposed to reduce the handover latency and the number of lost packets. We focus on Fast Mobile IPv6 which is an extension of Mobile IPv6 that allows the use of L2 triggers to anticipate the handover. We compare the handover latency in four specific cases: basic Mobile IPv6, the forwarding method of Mobile IPv6, the Anticipated method, and the Tunnel-Based Handover. The results of the handover latency are calculated with the L2 properties of IEEE 802.11b. In particular, we take into account the L2 handover for different configurations of the wireless network. 相似文献
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Seung‐Hee Hwang Bo‐Kyung Lee Youn‐Hee Han Chong‐Sun Hwang 《Wireless Communications and Mobile Computing》2004,4(2):233-245
The Hierarchical Mobile IPv6 (HMIPv6), which is based on the Mobile IPv6 (MIPv6), has been proposed by IETF to reduce registration control signaling. It separates micro‐mobility from macro‐mobility with the help of an intermediate mobility agent, called the mobility anchor point (MAP), and exploits a Mobile Node's (MN's) spatial locality. However, all packets from a Correspondent Node (CN) to an MN are delivered through the MAP. That causes delay in packets delivery and the congestion of packets in the MAP so that it results in deterioration of network capability. To alleviate these problems, we propose a Hierarchical Mobile IPv6 protocol using not only spatial locality but also temporal locality. We introduce a profile for management of these locality information. According to the information in the profile, some packets are directly delivered to an MN, if MN seems to reside for a long time in the current subnet. Also, we introduce a handover scheme with the help of an L2 trigger, so that the proposed scheme takes nearly the same handover delay time as HMIPv6. The other contribution of this paper is to suggest a mathematical modeling and analysis of network traffic costs, MAP processing costs and handover latency for both HMIPv6 and the proposed scheme. Copyright © 2004 John Wiley & Sons, Ltd. 相似文献
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XU Kai JI Hong YUE Guang-xin Telecommunication Engineering School Beijing University of Posts Telecommunications Beijing P.R. China 《中国邮电高校学报(英文版)》2004,11(Z1)
1 Introduction MobileIPv6requirestheMobileNode (MN)toregisterwiththeHomeAgent (HA)andtheCorre spondentNode (CN)whenitchangesitspointofattachmentintheInternet[1~ 3] .Therefore ,thiscauseMobileIPv6toincurlongdelayintheregis tration process,andaddsignalingtraffictothebackbonenetworkespeciallywhentheHAandCNarefarawayfromtheMN .Inordertominimizethisdelay ,andthesignalingoverhead presentinMobileIPv6,literatures[4~7] proposeHierarchicalMobileIPv6(HMIPv6)architectureandafasthan dover… 相似文献
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Handover delay performance is a critical issue to support real-time applications in wireless networks. To address this issue, this paper presents an Enhanced fast handover Triggering Mechanism (ETM) to improve the handover performance of mobile nodes (MNs) in Fast Proxy Mobile IPv6 (FPMIPv6). Making use of the information from the link layer, the ETM predicts two cases that the MNs perform in the reactive handover mode. Then, it establishes the bi-directional tunnel in advance for fast handover. As a result, the reactive handover delay is significantly reduced. Integrating the ETM into FPMIPv6 forms an enhanced Fast Proxy Mobile IPv6 (eFPMIPv6) protocol. Simulation experiments show that with the presented ETM mechanism, the eFPMIPv6 outperforms the original FPMIPv6 in terms of the overall handover performance. 相似文献
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Hierarchical Mobile IPv6 (HMIPv6) has been proposed by the Internet engineering task force (IETF) to compensate for such problems as handover latency and signalling overhead when employing Mobile IPv6 (MIPv6). HMIPv6 supports micro‐mobility within a domain and introduces a new entity, namely mobility anchor point (MAP) as a local home agent (HA). However, HMIPv6 has caused load concentration at a particular MAP and longer handover latency when an inter‐domain handover occurs. In order to solve such problems, this paper establishes a virtual domain (VD) of a higher layer MAP and proposes a MAP changing scheme. The MAP changing scheme enables complete handover by using binding‐update of the on‐link care of address (LCoA) only when inter‐domain handover occurs. In addition, the concentrated load of a particular MAP is distributed as well. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
16.
This paper proposes a fast handover mechanism to provide a seamless multicast service for Mobile IPv6 hosts. With the proposed
Fast handover based on a Mobile IP-Multi casting (FMIP-M) protocol, the selection of a new multicast service method, service
preparation, and initialization procedures are all performed during the fast handover period, thereby enabling a reliable
and efficient multicast service. When mobile hosts move to other networks, they can encounter data loss, out-of-synch problems
for multicast data, and multicast service exchange latency. Therefore, the proposed FMIP-M allows the new access router to
select a suitable multicast service method according to the multicast service-related network conditions and supports a reliable
multicast transmission by compensating for data losses from the previous access router. An analysis is conducted of the overheads
associated with a fast multicast handover, including the signaling cost and multicast packet-forwarding cost, where the costs
are formulated based on timing diagrams, and compared with a fast handover using Mobile IPv6. The performance analysis and
numerical results confirm that the proposed FMIP-M provides a fast multicast handover and reliable service with a relatively
small signaling cost and packet-delivery cost. 相似文献
17.
There has been a rapid growth in the need to support mobile nodes in IPv6-based networks. IETF has completed to standardize
Mobile IPv6 (MIPv6) and Hierarchical Mobile IPv6 (HMIPv6) for supporting IPv6 mobility. Even though existing literatures have
asserted that HMIPv6 generally improves MIPv6 in terms of handover speed, they do not carefully consider the details of the
whole handover procedures. In this paper, based on the current IETF standards of both MIPv6 and HMIPv6, we conduct a comprehensive
study of all IP-level handover procedures: movement detection, duplicate address detection, and location registration. Based
on this study, we provide a mathematical analysis on MIPv6 and HMIPv6 performance in terms of handover speed. From the analysis,
we reveal that the average HMIPv6 handover latency is not always lower than the average MIPv6 handover latency. Furthermore,
even the intra-domain handover latency of HMIPv6 is not reduced much compared with MIPv6 handover latency. A finding of our
analysis is that optimization techniques for movement detection and duplicate address detection are essential to shortening
HMIPv6 handover latency and increasing the benefit of HMIPv6.
相似文献
Sung-Gi MinEmail: |
18.
Handovers in mobile packet networks commonly produce packet loss, delay and jitter, thereby significantly degrading network
performance. Mobile IPv6 handover performance is strongly topology dependent and results in inferior service quality in wide
area scenarios. To approach seamless mobility in IPv6 networks predictive, reactive and proxy schemes have been proposed for
improvement. In this article we analyse and compare handover performance and frequencies for the corresponding protocols,
as they are an immediate measure on service quality. Using analytical methods as well as stochastic simulations, we calculate
the performance decreases originating from different handover schemes, the expected number of handovers as functions of mobility
and proxy ratios, as well as the mean correctness of predictions. In detail we treat the more delicate case of these rates
in mobile multicast communication. It is obtained that performance benefits, expected from simple analysis of predictive schemes,
do not hold in practice. Reactive and predictive handovers rather admit comparable performance. Hierarchical proxy environments—foremost
in regions of high mobility—can significantly reduce the processing of inter–network changes. Reliability of handover predictions
is found on average at about 50%. 相似文献
19.
Yi Sun Yucheng Zhang Yilin Song Eryk Dutkiewicz 《Wireless Personal Communications》2011,60(4):769-807
In recent years, with the development of mobile communication technologies and the increase of available wireless transmission
bandwidth, deploying multimedia services in next generation mobile IPv6 networks has become an inevitable trend. RSVP (resource
reservation protocol) proposed by the IETF is designed for hardwired and fixed networks and can not be used in mobile environments.
This paper proposes a protocol, called Fast RSVP, to reserve resources for mobile IPv6. The protocol adopts a cross-layer
design approach where two modules (RSVP module and Mobile IPv6 module) at different layers cooperate with each other. Fast
RSVP divides a handover process with QoS guarantees into two stages: (1) setup of the resource reservation neighbor tunnel
and (2) resource reservation on the optimized route. It can help a mobile node realize fast handover with QoS guarantees as
well as avoid resource wasting by triangular routes, advanced reservations and duplicate reservations. In addition, fast RSVP
reserves “guard channels” for handover sessions, thus greatly reducing the handover session forced termination rate while
maintaining high performance of the network. Based on extensive performance analysis and simulations, Fast RSVP, compared
with existing methods of resource reservation in mobile environments, performs better in terms of packet delay and throughput
during handover, QoS recovery time after handover, resource reservation cost, handover session forced termination rate and
overall session completion rate. 相似文献