解析IPv6技术及其在移动互联网中的应用

随着科技时代的带来,计算机在世界范围内各个行业均得到了极大的普及,其也带动了Internet的快速发展。就现阶段信息业的发展需要,主要包括访问Internet及接入Internet,但其受到IP地址的极大限制,则IPv6技术应运而生。IPv6不仅将移动IPv6纳入了系统范围内,也充分考虑了移动需求,则IPv6于移动环境下为多媒体业务及端到端提供了众多支持。IPv6标准的完善也促进了将其引入移动网络的实现。     

移动IPv6路由优化性能分析

用NS-2.1b6＋Mobiwan进行仿真实验,给出了移动IPv6三角路由和优化路由之间的性能比较分析。在仿真实验中,检测了移动节点在广域IPv6网移动时通信对端节点和移动节点之间的端到端分组时延。实验结果表明,移动IPv6优化路由的性能明显优于三角路由。     

移动IPv6切换时延优化新方法

移动IPv6中,移动节点(MN)在不同子网间移动时,既不中断与通信对端(CN)的通信,也不用改变其本身的IP地址.但是当MN与其家乡代理(HA)之间相距较远时,移动IPv6切换时延较大,对于实时性要求较高的业务无法适用.本文分析比较了目前移动IPv6常用的切换时延优化方法,提出了一种自适应快速层次移动IPv6切换时延优化方法,减小了移动IPv6切换时延,提高了网络的性能.     

移动IPv6安全性

文章分析了在IPv6网络中引入移动IP协议可能给网络带来的安全隐患，并讨论了移动IPv6所采用的安全技术．包括如何用IPsec协议和往返可路由过程来保护移动IPv6信令安全的机制。     

基于IPv6协议的手机视频应用示范研究

借助上海移动互联网IPv6应用示范项目,研究了适用于本次移动互联网IPv4向IPv6过渡的关键技术,制定了手机视频IPv6应用改造的端到端解决方案。通过在多终端类型以及多网络条件下,对改造后的手机视频应用进行一系列测试,文章得出了安卓客户端在WLAN网络下表现最佳的结论,并提出了增加手机终端对IPv6协议的支持度,以及优先在WLAN和LTE网络中推广IPv6应用的建议。     

移动IPv6及其在3G网络中的应用

快速增长的移动数据业务需求推动着IPv6(尤其是移动IPv6)和3G不断向前发展。对移动IPv6的通信原理以及3G数据网络的基本结构与协议栈进行了描述，并在此基础上对移动IPv6在3G网络中的实现进行了探讨。     

移动IP的安全性研究

移动IP技术是移动技术和IP技术的深层融合,移动IP通信的自身特点决定了该系统安全机制的重要性。文章分别介绍了移动IPv4和移动IPv6中存在的安全隐患,然后分析了几种典型的攻击方法,并给出了相应对策。     

IPv6再升温——移动IPv6安全浅析

本文在简述移动IPv6原理的基础上，分析了在IPv6网络中引入移动性可能为网络带来的安全隐患，并讨论了移动IPv6所采用的安全技术，包括如何用IPsec协议和往返可路由过程来保护移动IPv6信令消息安全的机制。最后，结合国内外标准化以及产业推动情况，展望了移动IPv6应用的发展前景。     

IPv6在3G中的应用

随着IPv6标准的成熟,在移动网络中引入IPv6已成为通信网络的重要发展方向。文章主要研究了IPv6在3G网络中的应用,首先介绍了3G数据传输网络结构,接着介绍了移动终端接入基于IPv6的3G网络的情况,最后着重描述了3G网络中IPv4向IPv6的过渡机制。     

IPv6通信能力指标化分析方法及在端到端运营级网络的应用

针对新、老旧设备混合组建的端到端运营级网络,产业界通常采用传统的定性方法描述其IPv6通信能力。通过定义IPv6通信事件、IPv6通信能力指标,提出了单节点、节点集、单路径、多路径以及端到端运营级网络的IPv6通信能力指标及其计算方法,从而实现IPv6通信能力的指标化分析,并评估了端到端运营级网络的IPv6通信能力。     

基于无证书公钥密码体制的密钥管理

移动IPv6是IPv6的子协议,有着巨大的地址空间、对移动性和QoS的良好支持,内嵌的IPSec协议,以及邻居发现和自动配置等诸多优势。然而,移动通信网络链路的开放性、网络拓扑结构的动态性、移动资源的有限性等特点使其容易遭受更严重的安全威胁。针对在移动IPv6环境下,采用无证书的公钥密码体制,部署和实现移动IPv6网络的密钥管理问题。提出了一种新的接入注册解决方案,该方案可以解决具有高敏感性要求移动网络的安全保护问题。     

IP multimedia services: analysis of mobile IP and SIP interactions in 3G networks

Third-generation cellular networks have been designed to provide a variety of IP data services. Both IPv4 and IPv6 are supported in order to provide future-proof solutions. Mobility is supported through both cellular-specific and IP mechanisms. Mobile IP is becoming a key technology for managing mobility wireless networks. At the same time, the session initiation protocol is the key to realizing and provisioning services in IP-based cellular networks. The need for mobility of future real-time service independent of terminal mobility requires SIP to seamlessly interwork with mobile IP operations. In this article, we investigate the issues related to interworking between SIP and mobile IP, with a focus on IPv6 and the applicability to 3G networks being standardized in 3GPP and 3GPP2.     

利用ad hoc网络实现下一代移动互联

随着ad hoc网络的研究工作的发展,以Internet接入为代表的ad hoc网络的应用问题越来越被人们所关注.在本文中,我们提出了一个将ad hoc网络和移动IPv6相结合的方案,首先将基于动态源路由(dynamic source routing,DSR)的MANET升级到IPv6使其能够接入6Bone网,并通过搭建测试床进行了验证和测量;在此基础上,又提出了移动IPv6的兼容方案,并通过仿真对其在不同环境下的性能进行了验证.     

网络隧道技术的原理和应用

介绍了网络隧道技术的原理和相关协议.网络隧道是利用封装和加密技术在公共网络中建立的一种虚拟专用连接,实现使用特殊协议的局域网或主机之间的通信,为用户提供安全可靠的服务.隧道技术在虚拟专用网、移动IP、IPv6等方面得到了广泛的应用.     

An IPv4-IPv6 translation mechanism for SIP overlay network in UMTS all-IP environment

Both IPv6 and session initiation protocol (SIP) are default protocols for Universal Mobile Telecommunications System (UMTS) all-Internet protocol (IP) network. In the existing mobile telecommunications environments, an IPv6-based UMTS all-IP network needs to interwork with other Internet protocol version 4 (IPv4)-based SIP networks. Therefore, mobile SIP applications are typically offered through an overlay structure over the IPv4-Internet protocol version 6 (IPv6) interworking environments. Based on 3GPP 23.228, we propose an IPv4-IPv6 translation mechanism (i.e., SIPv6 translator) that integrates different IP infrastructures (i.e., IPv4 and IPv6) to provide an overlay network for transparent SIP application deployment. In this paper, we present the architecture and the call flows of the SIPv6 translator. An analytic model is proposed to investigate the fault tolerance issue of our approach. Our study provides guidelines to select appropriate number of processors for fault tolerance.     

Fast Duplicate Address Detection for Seamless Inter-Domain Handoff in All-IPv6 Mobile Networks

In All-IP networks, each computer or communication equipment needs an IP address. To supply enough IP addresses, the new Internet protocol IPv6 will be used in next generation mobile communication. Although IPv6 improves the existing Internet protocol (IPv4), Duplicate Address Detection (DAD) mechanism may consume resources and suffer from long delay. DAD is used to make sure whether the IP address is unique or not. When a mobile node performs an inter-domain handoff, it will first generate a new IP and perform a DAD procedure. The DAD procedure not only wastes time but also increases the signaling load on Internet. In this paper, we propose a new DAD mechanism to speed up the DAD procedure. We create a DAD table in access or mobility routers in All-IP networks and record all IP addresses of the area. When a new IP address needs to perform DAD, it can just search in the DAD table to confirm the uniqueness of the address. Furthermore, we propose a new method, Fast Duplicate Address Detection (Fast DAD), to reduce data search time. Simulation results show that our method outperforms the existing DAD methods.     

CDMA2000标准制式的移动工P协议分析

随着IPv6标准的成熟和试运行,在3G牌照下发之际,能提供随时随地的移动数据通信已成为人们的迫切需求。通过移动IP协议,移动主机可以通过一个永久的IP地址连接到任何链路上,移动主机移动后仍可以保持正常通信。为了探讨移动IP协议在运营商级商用的技术可行性,文中通过剖析移动IP协议的工作原理及主要技术特点,就移动IPv6在CDMA2000网络中的系统结构、协议模型、路由方式及存在问题进行了探讨。     

Fast RSVP: Efficient RSVP Mobility Support for Mobile IPv6

In recent years, with the development of mobile communication technologies and the increase of available wireless transmission bandwidth, deploying multimedia services in next generation mobile IPv6 networks has become an inevitable trend. RSVP (resource reservation protocol) proposed by the IETF is designed for hardwired and fixed networks and can not be used in mobile environments. This paper proposes a protocol, called Fast RSVP, to reserve resources for mobile IPv6. The protocol adopts a cross-layer design approach where two modules (RSVP module and Mobile IPv6 module) at different layers cooperate with each other. Fast RSVP divides a handover process with QoS guarantees into two stages: (1) setup of the resource reservation neighbor tunnel and (2) resource reservation on the optimized route. It can help a mobile node realize fast handover with QoS guarantees as well as avoid resource wasting by triangular routes, advanced reservations and duplicate reservations. In addition, fast RSVP reserves “guard channels” for handover sessions, thus greatly reducing the handover session forced termination rate while maintaining high performance of the network. Based on extensive performance analysis and simulations, Fast RSVP, compared with existing methods of resource reservation in mobile environments, performs better in terms of packet delay and throughput during handover, QoS recovery time after handover, resource reservation cost, handover session forced termination rate and overall session completion rate.     

Micro-mobility mechanism for smooth handoffs in an integrated ad-hoc and cellular IPv6 network under high-speed movement

The success of the Internet has attracted more people to take part in network navigation. Numerous wireless-communication devices have rapidly evolved in the past decade. The demand for mobile communications is increasing and packet data services through Internet protocol (IP) networks have become a trend. To supply more IP addresses to network devices and improve network performance, a new IP version 6 (IPv6) was developed by the Internet Engineering Task Force in 1994. IPv6 supports certain features that make mobility management more efficient in mobile IP. A cellular architecture is needed to improve the communications quality and to reduce power consumption, both at the base and mobile stations. In a cellular environment, handoffs occur frequently. Reducing the defects caused by handoffs is extremely important in the mobile network environment. This is especially important for high-speed moving devices. In this paper, a handoff strategy called neighbor-assisted agent architecture, which takes advantage of the ad-hoc network to improve handoff performance, is proposed. Timing analytical and simulation results show that the proposed mechanism can provide a better solution than mobile IP for handoff breaks during high-speed movement.     

IPv6 on DSL: the best way to develop always-on services

The deployment of IPv6 has become an issue of strategic importance for many economies, and telecom operators and ISPs play a key role in ensuring the availability of this new protocol on broadband access networks. It cannot be denied that the complexities exist in deploying IPv6 in an IPv4 world. Knowing this, telecom operators and ISPs have to ensure a viable transition strategy that takes into account transparent interoperability and mature integrated functionalities for deploying advanced applications on both IPv4 and IPv6. This potent combination will enable operators and ISPs to exploit the richer services offered by IPv6 while interoperating IPv4 during this long transition period, creating a new business model that will generate return on investment without waiting for the whole world to be fully IPv6 deployed. Only the use of IPv6 at the end-user site can drive differentiated services, achieving returns in not only investments, but also in services innovation and flexible communication solutions. So both IPv4 and IPv6 protocols have now to be implemented on digital subscriber line access networks. Solutions are mature and are beginning to be deployed.