移动IP移动性管理技术综述*

融合型全IP网络已经成为网络发展的大趋势,采用移动IP解决无线IP网络中的移动性管理成为一种必然。移动IP v6作为网络层移动性管理的核心技术,其相关移动IP扩展技术是移动IP关于移动性管理的重要内容,但必须有更优化的微移动性管理协议处理本地移动性,层次型的移动性管理结构被大家所认同。分层移动性管理的策略对网络中位置代理的位置和层次进行规划,但是增加相应的管理机制引入切换管理愈加重要。     

RMIPv6协议中移动性管理的改进

介绍了目前常用的三种移动性管理协议,针对其中相对最优的RMIPv6协议存在的不足进行了分析,提出了AR直接转发的改进方案,并进行了评估,证明了其在移动性管理上的优越性。     

融合分层呼叫协议与GCM-FIFO的移动管理方案

针对节点高速移动的UAVS通信网络中的移动性管理问题,提出了基于分层呼叫协议的位置管理方案以及融合滞后余量与门限结合的切换判决方法、UAV节点自主决策的紧急切换控制策略和GCM-FIFO信道分配策略的切换管理方案。通过相关理论分析和图形化的测试与仿真,结果表明:分层呼叫协议解决了UAVS通信网中节点高移动性问题;针对系统切换业务量高但信道数有限的特点提出了GCM-FIFO信道分配方案,在满足一定的新呼叫阻塞的同时减小了UAV节点切换失败的概率;针对中继机节点可能被击毁而提出的UAV节点自主决策的紧急切换策略,弥补了一般性切换方案的不足。     

移动因特网中单播移动性管理研究*

基于移动因特网的移动性管理面临新的挑战。单播移动性管理协议和算法层出不穷,目的是为了使移动节点能进行平滑切换。研究了不同种类的单播移动性管理,分析了各种方案的优缺点,并总结了进一步的研究方向。     

基于SIP协议的应用层个人移动性的分析

移动IP技术对于移动性的支持在网络层,需要对网络协议进行修改,而SIP协议在应用层提供了对移动性的支持,无需底层网络协议的改变.文中深入探讨了SIP协议在应用层支持个人移动性的工作原理,设计了两个典型的个人移动性应用场景,进行了试验验证并对试验结果进行了分析讨论.试验充分证明了SIP协议在应用层对于个人移动性的良好支持,为解决底层移动协议对移动性支持所带来的种种问题以及移动IP缺失的环境提供了有益的补充.     

一种结合移动IP和SIP实现IP网络移动性管理的优化方案

本文提出了一种网络层和应用层相结合实现IP网络移动性管理的新方案。移动终端的固定IP地址作为数据传输的地址;当终端和所在子网使用的是不同的IP子网前缀时,使用转交地址形成隧道对数据进行收发;SIP地址作为用户帐号,是在应用层使用服务的地址,通过把它动态地和移动终端绑定来使用终端。方案中还提出了以SIP地址域的分级方式进行组织管理的用户数据库系统,定义了为子网中移动终端服务的区域代理。新方案能够对现役设备和协议改动较小的程度下,为下一代网络提供移动性管理。     

HMIPv6 over MPLS——一种适用于3G接入网的移动性管理方案

随着3G网络的快速发展,人们对它在移动性管理和网络服务质量方面的期望值也随之提高。基于这种需求,可将MPLS技术和HMIPv6协议采用一种松耦合的方式结合起来,为3G的接入网部分提供一种新的移动性管理方案。该方案不仅能够支持HMIPv6的快速切换算法,还能在节点发生越区切换时实现QoS保证。     

基于SIP协议的个人移动性的研究及实现

本文介绍一种基于SIP协议的个人移动性的实现方案。文中简要介绍SIP的功能．组件响应等。并在此基础上分析了它对于个人移动性的实现机制。在文章的最后介绍该实现方案。     

分布式移动性管理协议研究

本文首先对移动性管理协议的产生和发展进行了简要回顾,引出当前网络移动性管理协议所面临的挑战与发展,并得出进行分布式移动性管理协议研究的必要性。文章对移动性管理的基本原理、类别划分和分布式移动性管理的研究现状进行了阐述。根据设计思路的不同,将现有分布式移动性管理方案分为"革命性"性的设计方案和"演进性"的设计方案两大类,并采用统一的架构对当前分布式移动性管理的不同形式进行了统一的描述、分析和对比。最后,文章指出了分布式移动性管理仍面临的挑战及未来发展方向。     

基于MPLS的微移动性管理

MPLS和移动IP结合（简称移动MPLS）是一种先进的移动性管理技术。将MPLS与微移动管理相结合的技术（简称微移动MPLS）越来越受到广泛关注。该文综合移动性管理策略方面的文献,介绍一种微移动MPLS方案的基本原理,及标签交换路径的建立、切换和路由优化。     

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.     

全IP网络中的分层移动管理结构

该文首先简要介绍目前IP网上的移动管理方案MobileIP,然后重点分析讨论对MobileIP进行的改进和扩展,最后提出一种基于MobileIP的适于未来全IP网络的分层移动管理结构。     

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.     

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.     

一个新型嵌入式移动性支持方案

IETF的移动IP协议存在代理的部署少、三角路由增加网络开销以及操作系统的支持有限等问题,未得到广泛应用。该文针对移动IP协议的不足,提出了一个新型的嵌入式移动性支持方案。该方案引入嵌入式移动代理和地址索引服务器来实现移动管理,最大限度地减小了移动管理对网络基础设施的依赖,为单个或成组移动设备提供了透明的移动服务。仿真实验表明,该移动性方案开销小、效率高,易于实现。     

Hierarchical Mobility Label Based Network: System model and performance analysis

Hierarchical Mobility Label Based Network (H-MLBN) is a new approach to the network layer mobility management problem that relies on MPLS-aware control plane and MPLS-based forwarding plane to provide IP mobility support for IPv4 and IPv6 mobile hosts and routers while being able to ensure optimal traffic delivery between the communicating devices. The hierarchical system is capable of both macro- and micro-mobility support without the use of Mobile IP and its derivatives thus eliminating the user and network facing performance penalties associated with triangular routing and bi-directional tunneling. This paper presents a system model and provides performance analysis for H-MLBN and compares its performance with the Mobile IP based schemes. The results indicate significant performance improvements in the forwarding plane traffic delivery as well as the control plane network update costs.     

A proxy-based integrated cache consistency and mobility management scheme for client–server applications in Mobile IP systems

In this paper, we investigate a proxy-based integrated cache consistency and mobility management scheme for supporting client–server applications in Mobile IP systems with the objective to minimize the overall network traffic generated. Our cache consistency management scheme is based on a stateful strategy by which cache invalidation messages are asynchronously sent by the server to a mobile host (MH) whenever data objects cached at the MH have been updated. We use a per-user proxy to buffer invalidation messages to allow the MH to disconnect arbitrarily and to reduce the number of uplink requests when the MH is reconnected. Moreover, the user proxy takes the responsibility of mobility management to further reduce the network traffic. We investigate a design by which the MH’s proxy serves as a gateway foreign agent (GFA) as in the MIP Regional Registration protocol to keep track of the address of the MH in a region, with the proxy migrating with the MH when the MH crosses a regional area. We identify the optimal regional area size under which the overall network traffic cost, due to cache consistency management, mobility management, and query requests/replies, is minimized. The integrated cache consistency and mobility management scheme is demonstrated to outperform MIPv6, no-proxy and/or no-cache schemes, as well as a decoupled scheme that optimally but separately manages mobility and service activities in Mobile IPv6 environments.     

基于SIP的移动性管理

几个无线技术论坛,比如3GPP2,已经决定采用SIP作为移动因特网会话管理的信令协议,很显然SIP将成为移动因特网协议结构中不可分割的一部分。详细描述了怎样使用SIP对终端和个人移动性的支持。移动IP虽然使得移动性对更高层是透明的,但是它也带来了三角路由和隧道管理等问题,而SIP在应用层对移动性进行管理,对于实时通信来说,这种方案更加有效。     

基于多层小区结构的移动IP移动性管理研究

移动IP的实现不能离开移动通信网络的支撑,但是目前移动IP的实现很少考虑具体的移动通信网络结构,尤其是对于目前越来越占主导地位的多层小区的网络结构研究更是如此。文章给出了一种新的移动IP移动性管理方案,包括分层的FA拓朴、灵活的切换控制策略和两种COA方式,与其它的微移动协议相比,该方案更适合多层小区结构的网络。文中还对方案中的两种COA方式进行了深入研究,比较分析了不同应用对系统性能的影响。