宏移动协议和微移动协议的注册性能比较

根据IETF提出的移动IP协议RFC2002的注册要求，当移动节点驻留在远离归属网络的外地网络时，将会产生严重的注册延迟，从而引起严重的包丢失和通信吞吐量的下降，为了改变这些不足，人们提出了很多本地化的移动性管理方案，该文在深入研究多种本地化移动性管理方案的基础上给出了一个通用应用模型，并据此对RFC2002和本地移动性管理方案的的注册代价进行了深入的研究，给出了计算结果，并且对结果进行了详细的分析。     

改进的移动IP协议分析

IETF提出的移动IP支持移动节点进行全球的INTERNET上的移动,但是当移动节点进行微移动时,现有的移动IP方案会在网络中产生大量的注册报文,降低网络性能,造成较大的注册延时,从而引起严重的包丢失和通信吞吐量下降,因此有必要加以改进。文章介绍了三级模型、CellularIP和HAWAII等三种改进的移动性IP协议,并进行了详细分析。     

微移动IP协议的分析与研究

微移动IP协议是对基本移动IP协议的补充,能在域内提供快速、无缝切换控制并支持寻呼功能。论文通过建立通用的微移动IP模型对目前提出的各种微移动IP协议的工作原理做了详细分析。最后,分析和探讨了微移动IP与基本移动IP结合实现移动节点的广域移动时存在的问题和进一步研究的方向。     

移动支持协议移动管理代价研究

针对移动支持协议的移动管理代价进行了研究,提出了一种合适的网络模型.在此网络模型的基础上,采用理论分析的方法分析了使用各移动支持协议时,为支持MH(mobile host)移动给网络带来的信令开销,并采用数值仿真的方法,对只使用移动IP协议和引入层次移动时的信令开销以及采用MIP-RR,CIP和HAWAII等不同微移动协议时的信令开销进行了比较.结果表明:引入层次移动与只使用移动IP相比,显著减少了网络的信令开销;在不同的微移动协议中,使用显式删除旧路径的路径维护策略与频繁发送周期性的刷新报文相比,给网络带来的信令开销较小;使用路径更新报文发送到交叉MRA(mobile routing Agent)的路径更新方法与路径更新报文发送到GW(gateway)相比,具有较小的网络信令开销.     

移动自组网中Anycast路由协议的研究

讨论了Anycast通信协议模型和研究现状，提出一种基于AODV的Anycast路由协议用于移动自组网IP流通信．同时，在NS2模拟器中扩充了Anycast协议模块，并采用不同的网络参数测试了协议的性能．模拟结果显示，Anycast协议能有效平衡网络负载，减少包传输延时，增大网络吞吐能力．在节点移动性高且链路断裂频繁的情况下，Anycast服务也能提高移动自组网的性能．     

改进的IP微移动协议及QoS分析

移动IP的原理及IP微移动的几种改进协议和QoS问题,在此基础上提出了IP微移动的一般模型。     

移动IP中基于分布式注册服务器的指针优化策略

1.引言移动IP是一个在互联网上支持移动性功能的网络层解决方案,可以使移动节点以一个永久IP地址接入到任何网络上,并实现将IP包路由到位置不断改变的移动节点上。标准移动IP协议和路由优化协议都是通过家乡代理实时维护对移动节点的绑定来实现网络层的移动性管理。家乡代理中集成了数据传输和移动性管理功能,对所注册节点执行代理ARP,维护移动绑定,截获并封装转发分组,使家乡代理的     

微移动协议下全IP无线网络的移动性管理研究

改善移动节点通信质量的移动性管理最有效的方式是IP微移动．它的核心是切换管理．分析微IP协议和IP网络的不足之处．对全IP无线网络的移动性管理最关心的问题进行详细阐述,介绍一种目前主流的区域移动性管理协议PMIPv6．并分析其域内切换移动性管理机制。提出一种优化的基于网络的区域移动性管理域内切换管理方法．并与已形成IETF标准的切换管理方法进行性能分析比较．证明该方法可以有效地减少切换时延和位置更新信令代价．     

移动IP的优化位置管理

移动IP提供了宏移动解决方案,但是它不能解决移动节点在蜂窝网内频繁移动所遇到的信令开销大的问题。分析了移动IP微移动解决方案,并在微移动方案基础上优化域的大小,以获得良好的网络性能。     

移动IP：支持移动计算的IP协议

现今Internet上的网络层协议IPv4的路由算法不支持主机漫游,为此IETF提出了一种新的基于现有IP协议的移动IP协议,现在移动IP协议是被提议的Internet标准。本文首先简要讲述了该协议的要求、目标和原理,然后对移动IP的应用进行了初步的探讨。     

基于NAI和可变传输层标识的移动IPv6方案

该文分析了当前移动IPv6方案的不足,提出了基于NAI和可变传输层标识的移动IPv6方案。该方案提出主机用NAI唯一标识,无固定家乡IP地址,IP地址在网络接入点自动配置。传输层的连接标识绑定到NAI-IP映射表表项而不是IP地址。通过地址改变消息动态改变表项中的IP地址,实现传输层标识随对端IP地址的改变而改变,达到动态匹配,从而保持了传输层的连接,实现了IP移动性。该方案不需要IPv6扩展包头,大大减小了包头长度,提高了数据净荷的传输效率。避免了对每个报文的包头选项处理,提高了处理效率。不需要家乡IP地址,减少了IP地址的占用。     

Mobile networking through Mobile IP

Mobile IP is a proposed standard protocol that builds on the Internet Protocol by making mobility transparent to applications and higher level protocols like TCP. Mobile IP (RFC 2002) is a standard proposed by a working group within the Internet Engineering Task Force; it allows the mobile node to use two IP addresses: a fixed home address and a care-of address that changes at each new point of attachment. The article presents the Mobile IP standard in moderate technical detail and points the reader toward a wealth of further information. Is also describes how Mobile IP will change with IP version 6, the product of a major effort within the IETF to engineer an eventual replacement for the current version of IP. Although IPv6 will support mobility to a greater degree than IPv4, it will still need Mobile IP to make mobility transparent to applications and higher level protocols such as TCP. There is a great deal of interest in mobile computing and apparently in Mobile IP as a way to provide for it. A quick Web search for items related to Mobile IP returned over 60,000 hits-impressive even given the notorious lack of selectivity for such procedures. Mobile IP forms the basis either directly or indirectly of many current research efforts and products. The Cellular Digital Packet Data (CDPD), for example, has created a widely deployed communications infrastructure based on a previous draft specification of the protocol. In addition, most major router vendors have developed implementations for Mobile IP     

Performance of intelligent Mobile IPv6

Mobile IP is the current standard proposed by IETF for mobility management in IP networks. Mobile node communicating with static correspondent node (CN) has been considered in previous performance studies. We propose the mobility of CN and two additional mobility combinations for Mobile IP in this paper. CN mobility causes performance degradation in an environment with frequent handoffs. A new scheme for Mobile IPv6 called Intelligent Mobile IPv6 is proposed. It is observed through simulation results that the performance of Intelligent Mobile IPv6 is better than Mobile IPv6.     

移动IP的切换特征分析

移动IP是一种简单的、可扩展的全球移动管理方案.从理论上分析了移动IP的切换特征--分组丢失和分组乱序的概率分布.应用这个结果,优化了重叠区域半径.实例表明,模型准确地刻画了移动IP的切换行为.结果对于评价移动IP的切换性能非常有用.     

Design,implementation and experimental evaluation of an end-to-end vertical handover scheme on NCTUns simulator

This paper presents the simulation study of “Host based autonomous Mobile Address Translation” using NCTUns simulator. It is a network layer, end-to-end vertical handover solution, based upon modification of “Mobile IP with address Translation”. Vertical handover approaches generally require new network elements, a new layer in TCP/IP stack, or fixing a protocol at a particular layer. To enhance handover experience, recent approaches focus on reducing signalling, localizing the registration, creating hierarchies, using proxy, preparing handover in advance, predicting target network, or exploiting multicasting and path extension techniques. These approaches, however, demand change in the network infrastructure to support mobility and limit the scope of mobility. Despite end-to-end signalling, the Host based autonomous Mobile Address Translation scheme ensures minimum service disruption and distinctly allows global mobility of the mobile node without requiring any modification in the network. We have simulated the mobility of a multi-interface mobile node in a heterogeneous network environment composed of WiFi (IEEE802.11a, IEEE802.11b) and WiMAX (IEEE802.16e) access networks. Performance of the scheme is evaluated taking into account wide range of end-to-end delays between mobile node and the correspondent node, various speeds of the mobile node and different packet loss rates of the network. Based on our detailed simulation study, it has been observed that this scheme offers reduced service disruption time, packet loss and packet latency. The service disruption time is found to be significantly low (typically in the range of 10 ms) compared to that of Mobile IP (which is in the order of 100 ms); this makes this new scheme perfectly suitable for real time applications. Low service disruption time consequently reduces the packet loss by manyfold and the packet latency remains unaffected during and after handover due to translation of address at the source. The results suggest that this protocol is a viable vertical handover solution due to its simplicity, scalability, low overhead and ready deployability.     

Mobility label based network: Hierarchical mobility management and packet forwarding architecture

Scalability of the network layer mobility management solution is one of the most important requirements for the mobility control plane. Mobility Label Based Network (MLBN) is a new approach to the network layer mobility management problem that relies solely on MPLS to provide both macro- and micro-mobility for IPv4 and IPv6 mobile hosts and routers. This new approach does not rely on the existing IP mobility management protocols such as Mobile IP and is based on the combination of Multi-Protocol BGP (MP-BGP) and MPLS. In the context of the MLBN the scalable control plane should be capable of efficient Mobility Label distribution while allowing the MPLS-based forwarding plane to deliver mobile traffic in an optimal manner. This paper presents a hierarchical mobility management system capable of both macro- and micro-mobility support without the use of Mobile IP and its derivatives and allows scalable Mobility Label distribution and MPLS label stack based packet forwarding in support of optimal traffic delivery between the communicating mobile users.     

Performance Evaluation of Fast Handover in Mobile IPv6 Based on Link-Layer Information

Handover latency is the primary cause of packet loss resulting in performance degradation of standard Mobile IPv6. Mobile IPv6 with fast Handover enables a Mobile Node (MN) to quickly detect at the IP layer that it has moved to a new subnet by receiving link-related information from the link-layer; furthermore it gathers anticipative information about the new Access Point (AP) and the associated subnet prefix when the MN is still connected to the previous Corresponding Node (CN).This paper proposes an enhancement to Fast Mobile IPv6 handover (FMIPv6), based on link layer information, we also present performance evaluations in terms of the packet loss and handover latency using evaluation models.     

移动IP中低延迟切换的研究

移动IP技术支持节点在不改变本身IP地址的情况下随时连接Intemet.随着应用需求的不断提高,Mobile IPv4的低延迟切换已经无法满足目前的需求.在这篇文章中,提出一种新的策略来达到保证节点从一个子网进入另一个子网低延迟的较好效果.首先,代理提供一种缓存机制：如果通信过程中移动结点已经移动,代理将仍发送给移动节点的数据包缓存;接着,在各个代理上维护一个表格用来记录移动节点最新位置信息,代理通过这些信息将缓存的数据包转发到移动节点的最新位置.通过策略实施的具体工作分析,得出切换过程中数据包传递延迟可以明显减小的效果.