共查询到19条相似文献,搜索用时 78 毫秒
1.
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
2.
通过分析分层移动IPv6协议,提出一种基于分层机制的优化移动IPv6路由管理策略。该策略支持路由优化,能在域内、域间移动时实现快速切换以减少时延,提高网络资源利用率。 相似文献
3.
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
4.
5.
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
6.
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
7.
对未来移动网络首选的移动Ipv6的工作原理作了详尽的介绍,在此基础上,对移动IPv6的各种切换方案作了深入的探讨,进而引入了类比于3G移动通信系统切换的思想,最后提出了移动IPv6切换的下一步研究方向。 相似文献
8.
《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
9.
10.
11.
PB-FMIPv6是FMIPv6的优化协议,它通过授权PrNAR来代替MN做绑定更新过程,使绑定更新过程和MN链路层切换并行执行,从而缩短了切换时延。限定性链路层触发算法是在FMIPv6基础上提出的链路层触发算法,它通过提供精确的触发时间标准,使MN接收到FBack消息后立即开始链路层切换,即保证FMIPv6工作在预应式工作模式,又最大程度的减小了切换时延。借鉴限定性链路层触发算法的思想,本文针对PB-FMIPv6提出了优化限定性链路层触发算法,理论分析表明,该算法能够动态地根据网络情况,选择合理的触发时间,既保证PB-FMIPv6工作在预应式工作模式,又在合理的范围内缩短切换时延,避免MN在新链路中等待PrNAR完成绑定更新过程情况的发生。利用OMNeT++的仿真结果表明优化限定性链路层触发算法降低了PB-FMIPv6协议的延迟数据包数量和切换时间,提高了PB-FMIPv6协议的整体切换性能。 相似文献
12.
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
13.
14.
Various wireless communication systems have been developed and will be integrated into an IP-based network to offer end users
the Internet access anytime and anywhere. In heterogeneous multi-access networks, one of main issues is to manage nodes’ mobility
with session continuity and minimal handover latency. In order to support the mobility of mobile nodes, MIPv6 has been proposed
by IETF. Even though MIPv6 provides a solution to handling nodes’ mobility in IPv6 networks, there is a significant problem
due to its inability to support a seamless handover caused by long latency and high packet losses during a handover. FMIPv6
has been proposed to reduce MIPv6 handover latency by using an address pre- configuration method with the aid of L2 triggers.
Current research defines a general L2 trigger model for seamless handover operation, but it does not address the exact timing
and definitive criteria of L2 triggers which causes a significant effect on the handover performance of FMIPv6. This paper
considers the available timing and accurate criteria of L2 triggers. With the definitive L2 triggers, we present a practical
handover scenario to integrate L2 and L3 layers for low handover latency and low number of packet losses during a handover.
We also study the impact of definitive L2 triggers on the handover performance of the FMIPv6 protocol in real testbeds and
prove that the FMIPv6 protocol performs its handover operation prior to the L2 handover and obtains a seamless handover. 相似文献
15.
简述了移动IPv6的技术背景,从协议原理、移动机制以及注册过程等方面对其实现进行了分析,对网络移动性和几种移动IPv6改进技术发展进行了阐述,最后结合技术和业务发展趋势,对移动IPv6的应用进行了展望。 相似文献
16.
The fast mobile internet protocol version 6 (FMIPv6) was suggested as a fast handover mechanism over the mobile wireless Internets in order to reduce the handover latency of a mobile node (MN). However, FMIPv6 was originally designed to deal with single MN’s. In mobile wireless Internet, a multiple MNs may do a handover at the same time as a consequence of its movement from one network to another new one. This will therefore lead to the bandwidth waste and low handover performance. This paper intends to propose a multiple handover-based mobile node (MHB-MN) control method and an enhanced FMIPv6 mechanism in order to resolve the abovementioned problem. The proposal of such an MHB-MN method aims at having one mobile node work as a guide for a group of neighboring MNs. This means that the guide of MN prepares itself for a handover before actually taking the initial steps of the actual handover operation. Based on obtained results, it is plainly observable that by MHB-MN method, the handover initiation time, handover latency and handover control messages can be reduced compared to those of FMIPv6. Furthermore, the contention of the wireless channel for multiple MNs can be improved by the use of fewer control messages. Finally, the paper introduces an analytical model to show that by enabling the MHB-MN method and enhancing the FMIPv6 method, a multiple of nodes can perform rapid handover processes with low handover latency compared to that of the FMIPv6 technique. 相似文献
17.
18.
移动IP是一个在Internet上基于网络层提供移动性支持功能的要求较高的VoIP业务,切换延迟将直接影响到话音质量,严重时甚至会中断正在进行的会话.文章借助ns2网络模拟器仿真分析了WLAN中基于MIPv6的移动VoIP切换性能.结果表明,MIPv6及其扩展协议的切换性能优劣顺序依次为:F-HMIPv6、FMIPv6、HMIPv6、MIPv6.尤其是F-HMIPv6协议,无论端到端延迟还是切换延迟,都得到了最大的改善.所得结论能为网络切换性能的进一步优化提供重要依据. 相似文献
19.
Kuo‐Lung Wang Tsan‐Pin Wang Chien‐Chao Tseng 《International Journal of Communication Systems》2015,28(15):2082-2097
Vehicular wireless networks offer wireless multi‐hop communications between vehicles and roadside units (RSUs). To reduce deployment cost, the distance between two RSUs could be long; that is, the communications between an RSU and a vehicle may be carried out through multi‐hops among intermediate vehicles. When a vehicle is driven from one RSU to another, the wireless multi‐hop delay becomes more serious as the number of multi‐hop relays increases. The wireless multi‐hop delay is critical for some emergency service. For instance, in a traffic accident, when a patient was sent to the hospital by ambulance, the life information of the patient must be transmitted to the hospital on time through the multi‐hop wireless network. If the ambulance is moved from one RSU to another, the wireless multi‐hop delay becomes more and more serious as the ambulance is closing to another RSU. In this paper, we propose an RSU re‐routing strategy that dynamically alters multi‐hop communications until the best RSU with the shortest path using location information is found. Moreover, we compare the proposed strategy with the existing strategy in terms of broadcasting costs, re‐routing delay, and wireless multi‐hop delay of data transmission. Performance results show that the proposed strategy can reduce the wireless multi‐hop delay significantly. Copyright © 2014 John Wiley & Sons, Ltd. 相似文献