基于IP无线网络中的移动性

基于IP的无线网络将成为下一代移动网络的核心。在全IP无线网络中,移动性对多媒体应用起着十分重要的作用。文中探讨了基于IP的无线网络中的一些重要问题,包括移动IP、移动IPv6和其它相关的一些技术。还讨论了无线局域网(WLAN)、无线广域网(WWAN)、2G以及3G蜂窝网和下一代混合移动网络中关于移动性支持等问题。     

IP无线网络中的移动性

文章探讨了基于IP的无线网络中的移动IP、移动IPv6和其它一些相关技术，同时还讨论了WLAN、WWAN以及3G蜂窝网和下一代混合移动网络中关于移动性支持等问题。     

一种基于紧耦合网络结构的终端垂直切换系统

随着移动终端无线数据业务的迅速发展,在异构无线网络间提供无缝连接和高速的多媒体服务将成为下一代无线网络[1]（4G网络）的重要特性。提出了一套基于紧密耦合网络结构的终端垂直切换系统。该系统利用核心网络的PCF切换机制,有效解决了IP移动问题。被设计成客户端的一个软件接口,易于在现实世界中快速实施。     

无线网络中的移动性管理

下一代无线通信网络的特点是异构性和全IP化,为了在这种环境下给用户提供无缝的业务体验,必须提供一个开放的、有高度适应性的移动性管理解决方案。文章详细介绍了传统的移动性管理,并基于此分析了潜在的通用移动性管理解决方案：移动IP和会话初始化协议以及它们的优缺点。最后指出了未来无线网络移动性管理要面对的挑战。     

IP系列之三移动回传网络IP化的实现

移动回传网络IP化的背景在电信业务和网络IP化转型的大趋势下,移动运营商的IP化进程也在逐步加速。在电信转型所涉及的众多领域里,移动承载网络的IP化是非常重要的内容之一。移动承载网络IP化的主要目标是建设一个承载下一代移动业务的、端到端基于IP技术的承载网,基于该IP承载网可运营下一代的、基于IP的移动业务。随着新的IP承载网及其承载的下一代基于IP的移动业务的逐步成熟和规模部署,现有的基于TDM技术的传输网络和其上运行的2G数字移动业务将逐步被替代。从这个意义上说,承载网络及其上运行的业务的IP化程度是电信转型程度的重要标志。     

下一代网络通用移动性管理技术初探

针对下一代网络(NGN)的通用移动性要求,阐述了符合NGN全IP网络传送这一特点的两类移动性解决方案——基于网络层解决方案(移动IP)和基于应用层解决方案(移动SIP),比较了它们在支持终端移动性、个人移动性和业务移动性支持上的优缺点,进而分析两者结合方案,提出将网络层移动性管理进行联合优化设计,是研究NGN通用移动性管理技术的一种努力方向。     

下一代无线网络的移动性管理

在下一代无线网络中,用户可以任意地在不同的无线接入网之间切换。移动IP(MIP:Mobile IP)是当前无线IP网络中的移动性管理协议。但是移动IP协议难以为网络的服务质量(QoS:Qualicy ofService)提供保障。将多协议标记交换(MPLS:Multiprotocol Label Switching)和MIPv6结合的技术是解决这个问题的方案之一。本文介绍了MPLS和移动IP技术的基本原理,研究了基本移动MPLS和分层移动MPLS的实现方案,并基于HMIPv6 over MPLS网络结构介绍了一种为无线网络提供Qos支持的实现方案。     

4G网络的移动性

第四代移动通信系统(4G)是一个基于IP业务的无线网络集合。4G系统的目标是用户始终能连接上最佳网络,并实现无缝漫游。目前需解决网络移动性和网络体系结构问题,并验证二者的可行性。文章主要探讨与4G相关的网络移动性问题,并对未来工作提出展望。     

论无线网络中的软交换

下一代网络是开放、多业务承载的网络,软交换是下一代网络的关键技术,它使3G向具有融合多媒体业务能力的全IP分组网络方向发展;伴随着无线网络的快速发展,在软交换基础上构建无线网络变得越来越重要.阐述了软交换技术和无线网络,并且简单地介绍了3G,在这些基础之上讨论了无线网络中的软交换.     

基于MIH的WLAN/WiMAX宏移动性研究

下一代无线网络将是异构IP网络,为了提供无缝切换服务,结合IETF提议的移动IPv6(MIPv6)协议与IEEE802.21工作组提出介质独立切换(MIH)标准,设计出一种基于MIH异构网络宏移动性的垂直切换方案。在NS-2仿真环境中,验证了此方案的可用性,详细分析了网络切换时延和丢包率,并根据分析结果提出进一步研究方向。     

Mobility support across hybrid IP-based wireless environment: review of concepts, solutions, and related issues

The 4G or Beyond 3G wireless networks is consist of IP-based heterogeneous access networks from 3G cellular, WiFi, WiMAX to other emerging access technologies such as mesh networks. The key objective of designing the next generation wireless networks is to support of mobile subscribers. To support the mobile host in the hybrid wireless access technologies, many solutions based on network protocol stack have been proposed in the literature. In this article, after review of mobility concepts, a special attention is given to some of the mobility management methods as well as handover techniques across various wireless access networks. We have also compared the major mobility protocols in each layer for their features. Finally, some of the open issues that needed to be addressed in mobility management protocol in the next generation wireless networks are outlined.     

Mobility support for IP-Based networks

IP-based wireless networks will become the core of next-generation mobile networks. Mobility support plays an important role in all IP-based wireless networks for providing multimedia applications. In this article we address various major issues in mobility support for IP-based networks. Existing technology, including Mobile IP, Mobile IPv6, and other related techniques, are discussed. The issues of mobility support for wireless LANs, wireless WANs, 2-3G cellular networks, and next-generation heterogeneous mobile networks are also addressed in this article.     

cdma2000 RAN IP化承载方案探讨

随着移动网络从2G向3G的迈进,移动网络IP化的进程日益加速,移动软交换网络的建设拉开了移动核心网络向IP化演进的序幕,而移动接入网（RAN）侧的IP化也逐渐成为电信运营商关注的热点。电信级以太网技术作为承载IPRAN的技术之一越来越受到人们的重视。本文从电信级以太网技术分类和技术特点分析出发,基于cdma2000基站的承载需求,对电信级以太网在基站IP化承载领域的解决方案进行了分析和探讨。     

Mobility management in next-generation wireless systems

This paper describes current and proposed protocols for mobility management for public land mobile network (PLMN)-based networks, mobile Internet protocol (IP) wireless asynchronous transfer mode (ATM) and satellite networks. The integration of these networks will be discussed in the context of the next evolutionary step of wireless communication networks. First, a review is provided of location management algorithms for personal communication systems (PCS) implemented over a PLMN network. The latest protocol changes for location registration and handoff are investigated for mobile IP followed by a discussion of proposed protocols for wireless ATM and satellite networks. Finally, an outline of open problems to be addressed by the next generation of wireless network service is discussed     

支持移动无线接入的IP网络QoS保证技术

针对服务质量(QoS)保证技术问题,从移动性、无线链路特性和IP网络传统的QoS保证技术的改进几个方面出发,对下一代支持多种移动无线接入的IP网络中,QoS保证技术的相关研究热点及技术现状进行了分析和总结,并提出了本研究方向QoS分层模型和进一步的研究建议。     

Wireless Internet access for mobile subscribers based on theGPRS/UMTS network

With the advent of IP technologies and the tremendous growth in data traffic, the wireless industry is evolving its core networks toward IP technology. Enabling wireless Internet access is one of the upcoming challenges for mobile radio network operators. The General Packet Radio Service is the packet-switched extension of GSM and was developed to facilitate access to IP-based services better than existing circuit-switched services provided by GSM. We illustrate how a visited mobile subscriber on a GPRS/UMTS network can access his/her home network via the gateway GPRS support node (GGSN). We also propose some implementation ideas on wireless Internet access for a remote mobile subscriber based on a GPRS/UMTS network     

基于IP的3G服务质量控制及实现

第三代移动通信系统 (3G)的第二阶段是采用IP传送网 ,服务质量 (QoS)是极其重要的问题。在讨论基于IP的 3G中QoS体系结构、业务QoS要求基础上 ,重点研究QoS控制原理和区分服务的实现 ,并得出一些有参考价值的结论。     

浅析下一代移动通信网络的安全问题

随着移动通信网络的不断发展,无线接人技术、终端技术、网络技术和业务平台技术正向异构化、多样化和泛在化的趋势发展。下一代移动通信网络具有开放、灵活、可管理、移动的网络架构特点,因此其安全问题将比以往移动通信系统更加复杂。文章从下一代移动通信网络的组网结构人手,结合第二代及第三代移动通信系统存在的安全问题,分析下一代移动通信网络所面临的安全威胁,论述了其应具有的安全体系结构。     

IP Paging Service for Mobile Hosts

In wireless networks, mobile hosts must update the network with their current location in order to get packets delivered. Paging facilitates efficient power management at the mobile host by allowing the host to update the network less frequently at the cost of providing the network with only approximate location information. The network determines the exact location of a mobile host through paging before delivering packets destined to the mobile host. In this paper, we propose the concept of paging as an IP service. IP paging enables a common infrastructure and protocol to support the different wireless interfaces such as CDMA, GPRS, wireless LAN, avoiding the duplication of several application layer paging implementations and the inter-operability issues that exist today. We present the design, implementation, and detailed qualitative and quantitative evaluation, using measurements and simulation, of three IP-based paging protocols for mobile hosts.     

Mobility support in IP: a survey of related protocols

This article presents an overview of a set of IP-based mobility protocols mobile IP, HAWAII, cellular IP, hierarchical MIP, TeIeMIP, dynamic mobility agent, and terminal independent MIP - that will play an important role in the forthcoming convergence of IP and legacy wireless networks. A comparative analysis with respect to system parameters such as location update, handoff latency and signaling overhead exposes their ability in managing micro/macro/global-level mobility. We use this observation to relate their features against a number of key design issues identified for seamless IP-based mobility as envisioned for future 4G networks.