基于移动IP的GPRS和WLAN的网络融合分析

本首先介绍了GPRS、移动IP、WLAN三的技术特点及其技术上的互补性，分析了一种GPRS和WLAN融合方案的不足，最后提出了一种新的基于移动IP的GPRS和WLAN网络融合方案。     

移动运营商网络数据业务的探讨

首先分析了当前移动运营商必须开展增值业务的紧迫性，在介绍移动IP技术的基础上，引出了移动业务与数据业务融合的服务方案，提出了当前融合GPRS和WLAN的网络架构及融合GPRS与WCDMA和WLAN的网络架构，提出了GSM与WCDMA双模无缝网络。本文所建议的融合方案有利于形式多样的数据业务的开展。     

基于MIPv6的异质无线网络的无缝切换策略

由于无线网络技术的多样性，用户在采用不同接入或存取技术的无线网络间的无缝切换是一个非常重要的课题，本提出一种新的基于MIPv6的WLAN与GPRS网络融合方案和在这种结构下的无缝切换机制。     

基于移动IP的GPRS和WLAN的网络融合分析

本文首先介绍了CPRS、移动IP、WLAN三者的技术特点及其技术上的互补性,分析了一种GPRS和WLAN融合方案的不足,最后提出了一种新的基于移动IP的GPRS和WLAN网络融合方案。     

WLAN漫游及与移动网络融合的关键技术分析

本首先介绍了WLAN实现网络漫游的相关技术，然后分析了如何实现WLAN与GPRS的无缝切换，重点探讨了使用GMM/SM技术实现WLAN与移动网络的融合。     

WLAN＋LPHS移动网络技术探讨

在市场和网络建设的驱动下，各通信运营商都加强了对移动IP网络的研究工作，如中国移动推出的WLAN＋GPRS的网络．中国联通推出的WLAN＋CDMA的网络，中国电信做为国内最大的固话运营商，可瞳预见通过WLAN＋PHS的结合，将为人们提供一种无缝漫游的移动IP网络，     

基于MIPv6的异质无线网络的无缝切换策略

由于无线网络技术的多样性,用户在采用不同接入或存取技术的无线网络间的无缝切换是一个非常重要的课题,本文提出一种新的基于MIPv6的WLAN与GPRS网络融合方案和在这种结构下的无缝切换机制。     

支持WLAN的语言和数据应用

伴随WLAN网络技术的发展,WLAN网络的安全性和漫游日渐完善和提高,基于WLAN网络的VoIP语音质量也可以和PSTN电话媲美。特别是WLAN网络和有线公用网的结合,使WLAN网络成为了现有有线和无线网络的扩展,现有网络运营商可以利用WLAN加现有网络为用户提供无缝覆盖和自动漫游,用户可以提前享受到下一代网络的实时,宽带和高速(1OMbit/s或更高)服务,运营商也可以获得更高地效益。北电网络《支持WLAN的语音和数据应用》为运营商和业界相关人士提供了完备信息。     

基于融合网络的WLAN漫游认证方式研究

在网络融合的趋势下,通过电信网络为WLAN网络提供终端认证将是未来WLAN业务认证的主要方式。为高效、安全地实现网间漫游状态下WLAN的鉴权认证,本研究分析了在网间漫游状态下WLAN的鉴权需求,讨论了鉴权模式、流程和存在的问题,提出了基于EAP SIM/AKA协议的、非中转方式的WLAN漫游认证方案,并进行了验证。实验结果证明该非中转认证方案可以满足终端在漫游状态下实现EAP SIM/AKA认证的需要,同时增强了系统的安全性,降低了投资成本,实现了实时计费。     

WLAN与3G无线数据网络的融合

第三代移动通信网络(3G)与无线局域网(WLAN)在覆盖区域和带宽上有不同的优势和局限性。3G网络支持跨广域网络的移动性,但是数据吞吐速度明显低于WLAN。WLAN提供了高带宽,但却限制在有限的覆盖区域内。如果将这两种网络融合起来实现无缝漫游,则无线业务传输服务的性能和灵活性就会得到极大提高。文章阐述了将这两种网络融合时会出现的问题,提出了“紧凑”融合模式和“松散”融合模式两种融合方案,并对它们的特点进行了比较。     

Wireless LAN access network architecture for mobile operators

The evolution of IP-based office applications has created a strong demand for public wireless broadband access technology offering capacity far beyond current cellular systems. Wireless LAN access technology provides a perfect broadband complement for the operators' existing GSM and GPRS services in an indoor environment. Most commercial public wireless LAN solutions have only modest authentication and roaming capability compared to traditional cellular networks. This article describes a new wireless LAN system architecture that combines the WLAN radio access technology with mobile operators' SIM-based subscriber management functions and roaming infrastructure. In the defined system the WLAN access is authenticated and charged using GSM SIM. This solution supports roaming between cellular and WLAN access networks and is the first step toward an all-IP network architecture. The proto-type has been implemented and publicly verified in a real mobile operator network     

A framework for seamless roaming across cellular and wireless local area networks

In the future, wireless and mobile users will have increased demands for seamless roaming across different types of wireless networks, quality of service guarantees, and support for a variety of services. This awareness has led to research activities directed toward intersystem and global roaming, and can be noticed in numerous products like multimode handsets, interworking gateways, and ongoing standards and research work on intersystem roaming. The authors of this article proposed a global mobility management framework to support seamless roaming across heterogeneous wireless networks. In this article we provide details on the use of the framework to support roaming across cellular and wireless local area networks. Highlights of the framework include a robust architecture for mobility management for varying user mobility spans, provisioning for QoS mapping, intersystem message translation, and mechanisms in the WLAN to support user-subscribed services. Performance aspects related to handoff delays, data redirection, and processing overheads are presented and discussed. Performance comparison of intersystem roaming between cellular and WLAN with and without the framework is presented.     

CDMA2000 Ev-Do与WLAN的无缝融合与垂直切换

异构网络无缝融合是未来网络发展的趋势,异构网间的垂直切换则是实现网络无缝融合的关键技术之一。本文针对CDMA2000 Ev-Do网络与WLAN的特点,提出基于移动IP的无缝融合网络结构,并在此基础上提出基于WLAN信号强度的垂直切换方法。     

Lightweight Secure Roaming Mechanism Between GPRS/UMTS and Wireless LANs

The third generation partner project (3GPP) has standardized general packet radio service (GPRS) and the universal mobile telecommunications system (UMTS) to provide cell phone communications and wireless Internet services. Although the data transmission rate is lower than that of wireless local area networks (WLANs), GPRS/UMTS covers larger areas. Hence, to achieve higher speed ubiquitous access, we propose a lightweight secure roaming mechanism (LSRM) that integrates GPRS/UMTS and WLAN. Taking advantage of these two technologies, LSRM offers anonymous roaming and friendly subscriber management. Besides, we give a formal security analysis to LSRM based on BAN authentication logic.     

3G与无线局域网联合组网及漫游技术分析

简要介绍了第三代移动通信网(3G)和无线局域网(WLAN)的发展现状、使用情况、各自的特点以及组网方式和漫游方式,针对两者在有效数据传输率、使用频段、覆盖范围、漫游策略和资费等方面的适用范围和互补性,在详细分析3G和WLAN联合组网漫游所具有优势的基础上,阐述了3G与WLAN联合组网和漫游的可行性,提出了一种两者联合组网和数据业务无缝漫游的实现方案,得出3G和WLAN联合组网在未来具有广泛应用前景的结论。     

WLAN与2.5/3代移动通信网的结合

文章探讨了无线局域网与蜂窝移动数据网互连与结合的机制,介绍了无线局域网与GPRS、cdma2000 1x、WCDMA等几种网络实现互连与结合的解决方案。     

Efficient mobility management for vertical handoff between WWAN and WLAN

As we move toward next-generation all-IP wireless networks, we are facing the integration of heterogeneous networks, such as WWAN and WLAN, where vertical handoff is required. In vertical handoff between WWAN and WLAN, mobile hosts should be able to move freely across different networks while satisfying QoS requirements for a variety of applications. In order to achieve seamless handoff and maintain continuity of connection, we propose a novel mobility. management system that integrates a connection manager to detect network condition changes in a timely and accurate manner, and a virtual connectivity manager that uses an end-to-end principle to maintain a connection without additional network infrastructure support. A prototype system was built to test the effectiveness of the proposed system. Experiments show that seamless roaming between WLAN and WWAN can be achieved, and much better performance can be obtained than with the traditional scheme.     

Home agent placement and IP address management for integrating WLANs with cellular networks

Seamless roaming between cellular networks (3G or upcoming 4G) and wireless local area networks can be provided using Mobile IP. However, GPRS/UMTS and 802.11-based WLAN networks have no native support for mobile IP. Mobile IP requires the deployment of home agents and a protocol between the mobile nodes, home agent, and corresponding nodes. We address the home agent placement and home address assignment issues for supporting mobile IP for heterogeneous roaming. Placement techniques for mobile IP home agents are presented including dynamic HA assignment in either WLAN or cellular network domains using the diameter mobile IP application. Next, we present several IPv4 home address assignment schemes for mobile nodes visiting in the WLAN domain such as NAT/NAPT traversal, reverse tunneling, and mobile VPNs. It is shown that HA placement and address management are orthogonal, and any combination is possible. Various architectures for both issues are evaluated against the optimal solutions     

基于云计算的WLAN和GPRS融合方案研究

主要研究在云端实现WLAN和GPRS相融合,利用云计算高安全性、高可靠性、在线迁移、实时共享等各类技术,将其应用在WLAN和GPRS融合业务之中,实现WLAN和GPRS业务的实时无缝切换。同时也有效利用了云计算的各种优势,提高了移动通信的各项性能。