支持IP漫游的多跳接入组网设计及协议扩展

针对现有固定宽带有线、无线接入技术存在的不足，本文结合Ad hoc技术和移动IP技术，提出了一种支持IP漫游的多跳接入方式，包括组网设计及协议扩展。其组网方式为：边缘接入采用多跳Ad hoc技术，主干接入采用分层移动IPv6技术。多跳Ad hoc网络大大增加了网络的覆盖范围，减轻了网络铺设成本，且支持宽带接入；分层移动IPv6降低了域内切换的信令开销和时延。同时，对现有的分层移动IPv6协议进行扩展，实现了主干网络与边缘多跳网络的有机结合。移动用户不但能以较低的信令开销实现全局的IP漫游，还能保证进入同一MANET网络中的移动节点直接通信，减轻了主干网络的传输负担，也保证了突发情况下节点能通过边缘MANET网络保持链路畅通。     

基于移动IPv6及MBWA的纯IP移动网络实现技术

介绍了移动IPv6协议对IP移动性的支持,以及IP移动宽带无线接入(MBWA)技术IEEE802.16e及IEEE802. 20标准,探讨了基于IPv6及MBWA结合的纯IP(Pure IP)移动通信网络实现技术。     

移动IP技术及其存在的问题与改进

为了满足移动计算机用户对Internet移动接入需求的急剧增长，IETF在IPv4的基础上设计了移动IPv4协议。本文介绍了移动IPv4技术的关键概念、基本特点和工作过程，并提出了当前存在的问题以及一些可能的改进方法。IPv6是IPv4的下一版，它对IPv4作了重大改进，本文后面重点介绍了IPv6对移动IP的支持，并比较了与移动IPv4的不同之处。     

基于Diameter的移动IPv6 AAA系统研究

针对移动IPv6 AAA的特点、要求和存在的问题,提出一个基于Diameter协议的移动IPv6 AAA系统的解决方案.该方案除了支持多种EAP认证方式、支持域间漫游及计费功能外,还支持各种接入技术,具有小的移动节点的切换延迟和高的认证安全性.     

IPv6/IPv4双协议栈以太网接入认证和移动技术

介绍了IPv6/IPv4双协议栈以太网接入路由器及其接入方案具有用户认证、用户管理和详细的数据统计功能,能够同时提供IPv6和IPv4接入,与移动家乡代理服务器配合,可支持移动IP用户,能够满足未来商业化的、有线无线一体化的以太网接入的需求。     

IPv6协议对移动性的支持

网络技术和移动技术是目前的两大通信技术。随着网络技术和便携式终端的迅速发展,在网络中实现对移动性的支持变得越来越重要。IPv6作为下一代互联网协议,是针对IPv4现在面临的问题提出的,对移动性的支持是IPv6的主要新特性之一。文中对协议IPv4和IPv6进行比较,阐述了IPv6对移动性的支持,分析了它的优点、工作原理和实现的关键技术。并以此说明IPv6能够使用户在移动状态下以多种接入方式享受移动服务,它的丰富的功能为移动性的解决方案提供了诸多方便。     

基于虚接口的移动IPv6协议的设计与实现

随着基于无线接入的IP业务应用需求不断增长,在下一代互联网中实现对移动性的支持变得越来越重要．本文介绍了在面向边缘网络接入应用的IPv6路由器原型系统中移动IPv6协议的具体实现．为了实现这一协议,文章分析了移动IPv6协议的特点,并借鉴虚拟网络（Virtual Networks）的思想提出了基于虚接口的设计和实现方岳,其主要优点是降低了协议开发的复杂度．该方法也可以用于实现其它的Internet高层协议．     

IPv6协议对移动性的支持

网络技术和移动技术是目前的两大通信技术.随着网络技术和便携式终端的迅速发展,在网络中实现对移动性的支持变得越来越重要.IPv6作为下一代互联网协议,是针对IPv4现在面临的问题提出的,对移动性的支持是IPv6的主要新特性之一.文中对协议IPv4和IPv6进行比较,阐述了IPv6对移动性的支持,分析了它的优点、工作原理和实现的关键技术.并以此说明IPv6能够使用户在移动状态下以多种接入方式享受移动服务,它的丰富的功能为移动性的解决方案提供了诸多方便.     

NEMO协议一致性测试集的设计与实现

基于网络移动的IPv6互联网将是未来网络发展的方向之一。NEMO是MIPv6最为重要的扩展部分，而协议一致性测试是保证协议实现正确性和有效性的重要手段。该文分析NEMO协议的特点，阐述对网络移动协议一致性测试的思想方法，并使用形式化的测试例描述语言说明了测试例设计与实现过程，给出在Linux实现下的测试结果及分析。     

全IP的有线无线一体化接入与认证技术

本文介绍了未来全IP化的网络,提出了基于IPv6协议的有线无线一体化接入和认证系统。这种接入网络可同时为有线用户和无线用户提供IP网络接入服务,能够进行认证和计费,能够支持IP漫游和移动。采用IPv6协议保证了为每个终端分配一个全局IP地址。满足未来基于IP的、端到端的通信需要。并对有线无线一体化接入和以太网接入认证技术进行了分析。     

代理移动IPv6多接口接入分析与测试

未来移动节点必须支持多个网络接口的应用。代理移动IPv6（PMIPv6）协议可以为移动节点提供基于网络的移动性管理,不需要移动节点参与移动性管理。分析了多接口技术在PMIPv6下的应用,详述了基于虚拟接口实现多接口接入PMIPv6的方法。在实验室集成开发环境下进行了实验测试,测试表明基于虚拟接口的PMIPv6多接口接入基本实现了多家乡和异构切换功能。     

Evaluation of MANEMO route optimization schemes

In the doorway of the Mobile IPv6 (MIPv6), it was considered as the standard protocol that support the host mobility. Due to its limitation that does not support the mobile routers (MRs), the Internet engineering task force (IETF) has introduced the NEMO basic support (NEMO BS) protocol. The mobile ad hoc network (MANET) routing protocol provides the local and the direct communications between two mobile devices within the nested NEMO (when multiple MRs are connected together). Integrating the MANET and the NEMO (MANEMO) provides the necessary additions to the existing protocols (IPv6, neighbor discovery (ND), and NEMO) to support the nested MRs. It provides a mechanism to select the most suitable path to the Exit Router (ER) as a default in the MANEMO Fringe Stub (MFS). The NCM (NEMO centric MANEMO) protocol is introduced to address the nested NEMO issues (e.g. pinball problem) by using the MANET routing a protocol (i.e., OLSR), while the MCM (MANET centric MANEMO) protocol is introduced to address the MANET problem (e.g. Internet connectivity). The main aim of this paper is to investigate the current approaches that are introduced to provide the route optimization (RO) for the NEMO. It highlights the strengths and the limitations of these approaches. Both the qualitative and the quantitative evolutions of these proposals are hereby presented.     

代理移动IPv6认证授权实现

代理移动IPv6协议是基于网络移动管理协议,是未来网络重要的移动性协议体系。代理移动IPv6认证授权实现给出了代理移动IPv6认证授权的设计方案,实现对接入网络中的移动节点进行接入认证和服务授权,并对该系统进行功能验证和性能分析实验,结果验证了设计有效可行。     

A novel network mobility handoff scheme using SIP and SCTP for multimedia applications

In a heterogeneous wireless environment, seamless mobility is the basis of network support with which mobile users who roam between or among various wireless access networks are able to fully enjoy uninterrupted wireless services. When users are in a mass transportation vehicle, e.g., a bus or a train that provides network service, the vehicle can be regarded as a network which is serving users as it moves from one location to another. The movement of a network is called network mobility (NEMO). The network mobility protocol based on Mobile IPv6 as proposed by the Internet Engineering Task Force (IETF) in 2005 has some fundamental drawbacks, such as header overhead and the pinball problem. In this paper, we propose a novel hybrid method for network mobility called Hybrid-NEMO, which provides a soft handoff scheme at the transport layer basically utilizing SIP and SCTP protocols to ensure a lossless packet-transmission environment and less handoff-delay variation, which are critical in providing QoS voice and multimedia applications. Experimental validation and performance evaluation were also conducted in this study.     

A Secure Correspondent Router Protocol for NEMO Route Optimization

The Network Mobility (NEMO) protocol is needed to support the world-wide mobility of aircraft mobile networks across different access networks in the future IPv6 based aeronautical telecommunications network (ATN). NEMO suffers from the constraint that all traffic has to be routed via the home agent though. The already existing correspondent router (CR) protocol solves this triangular routing problem and permits to route packets on a direct path between the mobile network and the ground based correspondent nodes. We identify security deficiencies of this protocol that make it unsuitable for use within the ATN. We therefore propose a new route optimization procedure based on the CR protocol that provides a higher level of security. We evaluate our new protocol in three ways. We first conduct a simulation based handover performance study using an implementation of a realistic aeronautical access technology. We then investigate the mobility signaling overhead. Finally, we specify a threat model applicable for the aeronautical environment and use it to perform a security analysis of both the old and our new protocol. It is shown that our protocol is not only more secure but also provides better handover latency, smaller overhead in the aeronautical scenario and a higher level of resilience when compared to the original CR protocol.     

移动IPv6中移动节点的两种地址

随着网络技术和便携式终端的迅速发展,在网络中实现对移动性的支持变得越来越重要.下一代网络协议IPv6因其巨大的地址空间和合理的报文结构,为节点移动性的实现提供了有力的支持.移动IPv6充分利用了IPv6协议对移动性的内在支持.介绍了移动IPv6的基本概念和通信原理,详细分析了移动节点的本地地址和转交地址,对两种地址之间的关系以及它们在移动通信中的重要作用进行了研究.     

Cellular universal IP for nested network mobility

In recent years, network mobility (NEMO) has been studied extensively due to its potential applications in military and public transportation. NEMO basic support protocol (NBSP), the current de facto NEMO standard based on mobile IPv6, can be readily deployed using the existing mobile IPv6 infrastructure. However, NBSP’s root in mobile IPv6, such as the need of care-of address (CoA) and tunneling, results in substantial performance overhead, generally known as route sub-optimality, in nested NEMO environments. This paper tackles this problem by proposing a scheme based on cellular universal IP (CUIP) to eliminate the need for CoA and tunneling in supporting nested network mobility. Using quantitative analysis, we show that the proposed scheme outperforms the existing nested NEMO schemes by multiple folds in terms of bandwidth overhead. We also show how IP fragmentation negatively impacts route optimality, and that the proposed scheme is inherently superior to the existing schemes in this regard. More importantly, while the scalability of the existing schemes generally deteriorates with the network size, the complexity of our proposed scheme is independent of the network size and thus is far more scalable. Our results show that the proposed scheme is particularly suitable for nested NEMO networks formed by mobile routers with random and ad hoc movement patterns.     

分布式移动管理技术综述

随着移动技术的发展,传统集中式移动管理技术暴露出越来越多问题。解决的办法是通过分布式移动管理技 术,将数据层面和控制层面的功能分布到接入网络中,而不集中在一个网络实体上。目前分布式移动管理技术主要针对移动 IPv6 协议和代理移动IPv6 协议两种主流协议进行改造。每种协议根据其自身特点,可以解决集中式存在的一些问题,提高网 络性能。     

移动IPv6的路由特性分析

移动IPv6是为了使各种移动设备在下一代IP网络间实现无缝漫游而设计发展的路由协议。尽管在移动IPv4中已经解决了节点移动的问题,但由于IPv4本身的限制,它无法解决各种节点和网络移动组合的路由情况。文章在移动IPv6下,不仅对节点移动,还对网络移动的路由特性进行了分析。     

基于移动Ipv6安全问题的分析

移动IPv6提供对节点移动和网络移动的支持,是目前优秀的支持移动接入的网络协议。通过对移动IPv6的逻辑结构、技术特点的讨论,分析移动IPv6所面临的安全性问题,给出解决方案,分析了移动IPv6今后可能面临的问题。