一种基于HIP的移动性管理机制

主机标识协议（Host Identity Protocol,HIP）是一种综合解决主机移动、多宿主及安全问题的有效方案,为了解决现有HIP机制在处理主机移动时存在切换延迟大、丢包率高等问题,提出了一种高效的基于HIP的移动性管理机制。该机制在基于HIP的层次化设计模型基础上,采用FMIPv6中的快速切换思想,引入了链路层触发机制、预先绑定更新机制和分组缓存转发机制。有效解决了移动主机在不同区域范围内的切换问题,降低了切换延迟和丢包率,改善了移动主机的切换性能,实现了透明、平滑、快速的网络切换。     

无线局域网下一种基于预处理的切换模式*

针对移动节点（mobile node,MN）在无线局域网中切换时,产生的切换延迟会严重影响实时应用的性能和丢包率问题,提出了一种基于预处理的切换模式。该模式是在满足预处理条件下,启动一种预先信道扫描算法,实施数据包的预转移和预恢复操作。这种切换模式不仅消除了切换过程中的信道扫描,而且实现了提前将发往MN的数据包转发到目的AP,从而解决了MN与对端主机建立路径所造成的丢包率过大的问题。实验结果表明,该切换模式降低了对实时应用的影响,达到了降低丢包率、减小切换延迟的目的。     

层次移动IPv6宏切换的优化方案

针对层次移动IPv6宏切换中丢包率高、切换延迟大的问题,提出一种将隧道机制应用于层次移动IPv6的优化方案（TBFMH）。TBFMH根据切换信息提前获得转交地址,进行重复地址检测,并在建立隧道的同时完成本地绑定更新。仿真实验表明,TBFMH比层次移动IPv6至少减少50%的切换延迟,同时降低了丢包率,有效提高了移动节点进行宏切换的性能。     

改进的分层移动IPv6网络中快速切换方法

分层移动IPv6加入移动锚点来管理同一域内的移动，减少注册开销，从而能极大地减少切换延迟。但对于不同域间的移动，这种分层的结构并不能很好地解决切换延迟。提出一种分层移动IPv6网络中基于流的快速切换方法，将业务流状态分析与分层结构的思想有效地结合起来，有助于减少切换延迟以及丢包率。分析结果表明，该方法比现有的分层移动IPv6以及基于流的快速切换方法有着更好的性能。     

基于双播机制的SIP无缝切换协议

下一代移动通信中实时多媒体业务对网络的服务性能提出了更高的要求,如低切换时延和低丢包率。针对上述要求,提出一种层次化的基于双播机制的SIP协议(HBSIP)。HBSIP是对现有移动SIP协议的改进,其关键是双播机制和分层结构。分析表明,HBSIP能大幅度降低移动主机切换时延和丢包率。     

主机标识协议(HIP)研究综述

TCP/IP协议一开始就没有考虑主机的移动和多宿主问题,也没有提供对主机的安全性和认证机制.主机标识协议(HIP)成为同时解决主机移动、多宿主及安全问题的有效方案.文本介绍了主机标识协议(HIP)的体系结构及基本交换,详细阐述了HIP对主机移动、多宿主和安全的解决方案以及对现有系统和应用程序的迁移,文中也分析了HIP存在的问题.     

移动IPv6切换技术研究

由移动IPv4技术发展而来的移动IPv6技术应用前景可观,但其存在诸多问题,如移动节点在不同网络间移动带来的网络切换问题,切换过程中地址重复检测的延迟问题等.基于层次化的移动IPv6,详细阐述了目前移动IPv6的几种切换技术,并对现有的几种切换技术在切换时延方面进行了比较,发现层次型快速切换技术有更小的切换时延和丢包率.     

基于邻居信息表的移动IPv6切换研究

分析标准移动IPv6(MIPv6)的快速切换机制,提出一种基于邻居信息表的移动IPv6快速切换解决方案。通过预配置和定时更新的方法使移动节点提前获取将要进入目标有限区域的信息表——邻居信息表,从而缩短切换中过程转交地址唯一性验证时间及移动检测延迟时间,降低切换过程中的丢包率。仿真结果表明,该机制不额外占用网络资源,能够减少切换过程中的丢包率和切换延迟时间。     

一种基于预测的移动IPv6动态调整快速切换算法

移动IPv6协议是下一代网络中移动节点实现无缝漫游的一种基本技术.但移动IPv6切换时延迟较大,不能满足实时业务的需求.本文提出一种基于预测的移动IPv6动态调整快速切换算法,根据移动节点的运动轨迹和移动速度预测出提前三层切换的正确时机,实现在二层切换之前完成三层切换,减少切换延迟.利用以前的三层切换时间,动态调整时间比较参数Treg,减少预测误差.仿真结果证明本算法在切换延迟和丢包率方面性能优越.     

一种基于HMIPv6网络的域间切换改进方案

针对层次型移动IPv6网络的域间切换中的切换延迟和丢包问题,提出一种使用转交地址池改进原来DAD的检测方法来减少切换延迟,采用双路径通信方式降低丢包率的域间切换的改进方案。理论分析改进前后的切换延迟,使用NS-2工具对改进协议进行仿真。实验结果表明,改进方案在切换时延和丢包率方面表现出较好的优越性。     

基于MPLS的移动IPv6预测式快速切换方案

针对现有的多协议标签交换（MPLS）和IPv6融合方案存在建立标签交换路径（LSP）所需时延大、丢包率高和无错误恢复处理等问题,提出了一种新的方案。该方案通过定义预测信息表和预测式MPLS移交切换算法,使得移动节点（MN）在移交切换前,根据自身需要选择目的接入路由器（TAR）,以便TAR提前完成其与交叉路由器（CR）的LSP建设,从而实现MN移交切换时延的最小化;另外,所提预测式MPLS移交切换算法使得该方案具有错误恢复的能力;对LSP拓扑结构的改进和采用双播机制能够有效减少切换丢包率。理论和仿真分析表明,所提方案的切换时延和丢包率小于现有方案,且具有错误恢复的能力。     

基于Delaunay三角剖分的FMIPv6快速切换机制

针对快速移动IPv6（FMIPv6)中预测新接入路由器(NAR) 出错时的丢包问题,提出了一种基于Delaunay三角剖分的快速切换机制(TFMIPv6)。该机制通过Delaunay三角剖分算法将网络分割成虚拟的三角拓扑结构,在相邻的接入路由器间建立隧道,通过目标接入节点候选表来协助移动节点快速重构两个新的转交地址,并将切换过程中到达的包缓存在两个可能的NAR中。仿真结果表明,TFMIPv6能获得比FMIPv6更小的切换延时及丢包率。     

An adaptive fuzzy handover triggering approach for Long‐Term Evolution network

To cope with the increasing demand for efficient data delivery, self‐organizing networks have been introduced in the Long Term Evolution (LTE) system to provide autonomous and flexible mobility management. The existing handover triggering scheme for LTE is not flexible enough to incorporate new performance metrics, and it introduces handover latency. There are studies on non‐conventional handoff algorithms for LTE applications, for instance, the fuzzy logic approach. However, the fuzzy logic approach needs regular manual tuning to constantly produce optimal output. In this paper, we address this issue by proposing an adaptive fuzzy logic‐based handoff decision algorithm, which can cope with environmental changes and improve efficiency by reducing human intervention. Performance results show that the proposed algorithm can reduce unnecessary handovers by about 20% compared with the fuzzy logic and conventional LTE handover triggering scheme, leading to reduced packet loss rates.     

Seamless handover integrated solution for video transmission over proxy mobile IPv6 in a micro mobility domain

Seamless communication is becoming one of the most important issues for the next generation of mobile and wireless networks. In this context, seamless is referred to users that are free to roam around different networks and at the same time stay connected without any disturbance to the ongoing session during the handover process from one network to another. The handover process between these networks spawns long delay or latency, high packet loss, and fewer throughputs which may degrade the performance of real-time applications during the handover process. Therefore, in order to resolve these problems, a new protocol has been proposed by Network-based Localized Mobility Management working group of Internet Engineering Task Force under network-based mobility management protocol. Although, this protocol managed to minimize the problems related to network switching, it still suffers several drawbacks during the handover process especially when the movement speed of mobile user is high. In this paper, we present a new approach which is a network-based mobility management protocol that aims to reduce the lengthy handover latency, jitter, high packet loss, and increase throughput and the performance of video transmission during the high speed mobility. The proposed approach namely Seamless Handover Integrated Solution consists of mobility prediction method, a set of Internet Control Message Protocol version 6 (ICMP6) messages which are effective in terms of handover optimization.     

异构无线Mesh网络层次化平滑切换方案

针对现有异构无线Mesh网络缺乏对域间移动切换支持的问题,提出支持域间切换的异构无线Mesh网络层次化切换方案,区分域内切换和域间切换,降低切换时延。采用缓存策略,有效降低丢包率,支持终端的快速移动。仿真结果表明,该方案可支持速度达23 m/s的终端移动,在域间切换时,平均丢包数减少66.7%~95.5%。     

Design and analysis of secure host-based mobility protocol for wireless heterogeneous networks

Mobility protocols allow hosts to change their location or network interface while maintaining ongoing sessions. While such protocols can facilitate vertical mobility in a cost-efficient and access agnostic manner, they are not sufficient to address all security issues when used in scenarios requiring local mobility management. In this paper, we propose a new scheme that makes Host Identity Protocol (HIP) able to serve as an efficient and secure mobility protocol for wireless heterogeneous networks while preserving all the advantages of the base HIP functions as well. Our proposal, called Heterogeneous Mobility HIP (HMHIP), is based on hierarchical topology of rendezvous Servers (RVSs), signaling delegation, and inter-RVS communication to enable secure and efficient network mobility support in the HIP layer. Formal security analysis using the AVISPA tool and performance evaluation of this method are provided; they confirm the safety and efficiency of the proposed solution. HMHIP reduces handover latency and packet overhead during handovers by achieving registration locally.     

改进型基于MPLS的HMIPv6的快速切换

针对现有的多协议标签交换(MPLS)和层次移动IPv6(HMIPv6)融合的方案仍然存在时延大、丢包率高等问题,提出了一种改进的基于MPLS的HMIPv6方案。本方案通过将多播技术应用于移动锚点(MAP),并且在切换完成之前提前完成新链路上标签交换路径(LSP)的建设,实现了移动节点(MN)移交切换时延的最小化,使得在切换过程中大大降低服务中断现象,最大限度地保证新链路建立完成之前数据包不被丢失。最后通过NS-2仿真与比较,结果表明本方案跟现有方案相比能够大大减少移动过程中的丢包率和传输时延,提高移动IP     

IEEE802.11网络中过后注册切换机制实现及性能分析

首先对移动切换过程和过后注册切换机制进行分析.在IEEE802.11网络上,对管理帧的信息单元进行扩展来构造二层触发消息,并在Linux上实现了过后注册切换机制.最后从丢包和切换时延两方面对过后注册切换机制进行性能分析.分析结果表明,过后注册切换机制明显降低了切换时延,减少了数据包的丢失.