移动互联网与接入网络的研究分析

移动互联网和接入网络是当前互联网技术的重要组成部分,而接入网络是保证移动互联网的稳定性和可靠性的关键。通过对移动互联网和接入网络的研究分析,可以了解它们的发展状况、未来趋势和发展潜力。因此,对移动互联网和接入网络的研究分析,具有十分重要的意义。文中就目前的接入网络技术进行了分析,分别阐述了卫星通信网络、无线城域网、无线局域网的特点及应用,提出了接入网络技术未来的发展趋势。     

移动接入系统的安全技术

第3代移动通信系统是未来移动接入系统的发展趋势,移动IP支持是第3代移动通信系统接入Internet的关键技术。文章在对第3代移动通信系统与移动IP协议安全需求分析的基础上,详细讨论了其安全技术及其安全实现方案。     

Digital inequalities and implications for social inequalities: A study of Internet penetration amongst university students in South Africa

International and national data sources confirm the limited access to the Internet in South Africa. However, there is a need to study how this limited access is distributed amongst population groups in the country. This study investigates the pattern of Internet access amongst university students in South Africa. University students are a relevant population group for studying technology penetration; this population is a generation born in the current era of digital revolution, they are presumably early adopters of technology and are adept in using them. A survey conducted in ten South African universities reveals that beyond publicly available access on campuses – with its attendant constraints, personal/household Internet access is a challenge and it reflects a pattern of inequalities in South Africa. Bearing in mind that social and economic exclusion is the biggest challenge for South Africa, this study reveals that digital inequalities amongst students replicate the pattern of social inequalities in the country. This exacerbates existing social inequalities, specifically amongst university students in South Africa, with certain categories of students being disproportionately disadvantaged.     

无线Internet接入技术及其发展现状

无线Internet接入是无线通信技术Internet结合的产物，本首先介绍了在线Internet接入的优势，然后详细列举了目前主要的无线Internet接入技术，并给出了应用特点。最后讨论了无线Internet接入的发展现状和存在的主要问题。     

基于Bluetooth和TD-SCDMA手机的无线局域网应用方案

文中从接入点结合Bluetooth TD-SCDMA手机出发，设计了一种无线局域网应用方案．从功能上讲相当于通过Bluetooth建立无线微微网，并以TD-SCDMA手机为主机平台建立，充分利用了TD-SCDMA网络的高传输速率和高覆盖率，实现微微网内所有从设备都能通过TD-SCDMA手机实现高速无线上网．首先，文中论述了TD-SCDMA手机和Bluetooth技术，然后在这基础上提出了应用方案．最后，阐述了方案的关键技术．     

欧洲无线DSL的发展现状及市场前景

对欧洲的立法者来说，目前最为关注的课题之一便是如何解决数字鸿沟这一困扰欧洲大陆信息与通信技术整体发展水平的矛盾。向人们提供高速因特网接入服务是消除数字鸿沟的有效手段，而无线数字用户线技术以及其成低、通信质量好、覆盖范围大及灵活性等优势成为宽带接入技术中的佼佼者，并获得很多欧洲国家电信运营商的青睐。     

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DVB/MPEG-2的卫星Internet技术

Internet的快速发展，使他已陷入了自身难以克服的困境，这种困境主要来自于骨干网、接入网、服务器三种瓶颈。而卫星通信与Internet的结合能有效地解决目前的这种困境。本文介绍了基于DVB／MPEG-2的卫星Internet原理、结构、应用及其关键技术，并引入了2种现有成熟的Internet接入技术：VSAT接入方式和VSAT与CATV结合接入方式。     

Overview of mobile WiMAX technology and evolution

Mobile WiMAX is a fast growing broadband access technology that enables low-cost mobile Internet applications, and realizes the convergence of mobile and fixed broadband access in a single air interface and network architecture. Mobile WiMAX combines OFDMA and advanced MIMO schemes along with flexible bandwidth and fast link adaptation, creating a highly efficient air interface that exceeds the capacity of existing and evolving 3G radio access networks. WiMAX networks, built on all-IP network architecture for plug and play network deployments, can support a mix of different usage and service models. While some consider mobile WiMAX as a candidate for the fourth generation of mobile networks, others view it as the first generation of mobile Internet technologies emerging from a wider ecosystem targeting to extend the success of WiFi over wide area networks supporting mobility. This article provides a high-level overview of mobile WiMAX technology and its evolution roadmap from both radio and network perspectives.     

MANET中的关键技术探讨

由于移动自组网(MANET)具有多跳的无线连接、动态拓扑及有限带宽等特征,给其路由协议带来了很多挑战.文中简要介绍了MANET的概念、特点,重点分析了MANET中的关键技术(无线资源管理与空中接口理论技术.路由技术、互联网接入技术、地址自动分配技术、域名系统和服务质量保证技术),同时对无线资源管理与空中接口理论技术、域名系统及服务质量保证技术的实现进行了简单的推测.     

基于IMS技术的物联网网络

物联网时代,需要通过不同的接入方式接入不同网络的通信终端之间的通信互联。本文通过分析物联网中的通信业务的特点,结合IMS技术的优点,提出了一种基于IMS技术的物联网网络架构,并介绍了一种基于IMS技术的视频通信系统的应用示例。     

三网融合背景下河南有线电视网络的机遇与挑战

广播电视网、电信业务网与互联网是信息产业发展的基础,三网融合则是现代信息技术产业发展的必然趋势。在分析研究三网融合的政策背景及有线网络行业前景的基础上,结合河南有线网络集团有限公司的发展历程、现实情况,分析其在三网双向准入、互联互通情况下的优势与不足,提出了促进河南有线网络发展壮大的意见和建议。     

Cable modem traffic jam

Broadband access to the Internet by cable modem promises users lightning-fast download speeds and an always-on connection. Recent converts to broadband from dial-up technology are thrilled with complex Web screens that download rapidly. Here, the author describes how tie-ups that slow broadband Internet access to a crawl are a reality-but solutions are also near at hand     

网格技术在通信网管理中的应用

网格被称为第3代因特网,它的目标是实现互联网上所有资源的全面连通。在OGSA、OGSI和GT3的基础上,提出了网格技术应用于通信网管理中的实现方案,其中重点介绍了GT3下网格服务的开发。有权限的用户使用浏览器或其他应用程序登陆门户,访问通信网管理网格服务,实现了有权限的用户对通信网的定制管理。     

A second wind for wiring [ADSL]

Asymmetric digital subscriber line (ADSL) modems deliver voice and high-speed data (at up to 6 Mb/s) simultaneously over ordinary twisted pairs. The author discusses the technology involved and its implementation. Various aspects of the service are considered together with Internet access     

工业互联网技术体系研究与应用分析

工业互联网是制造业与信息技术融合形成的应用结构,通过大数据分析、互联网技术与生产现场设备机器的全面结合,完成制造业和互联网融合的升级发展。因此,主要从国内外工业互联网的发展状况、工业互联网典型的应用场景、框架结构进行分析,概括涵盖的关键技术主要包括工业数据采集、存取和利用技术、工业产品的智能化技术、异构网络的融合技术和工控安全的防护技术,然后通过技术和行业的实施分析说明工业互联网平台在行业中产生的效果。     

卫星互联网下的VSAT卫星通信

本文介绍了VSAT通信在卫星互联网下的新发展,分析了VSAT系统的互联网接入方式,研究了卫星互联网的技术热点,展望了卫星互联网的发展前景.     

The role of Internet technology in future mobile data systems

Mobile telephony and the Internet are the fastest growing businesses in the telecommunications market. This is why most operators and service providers are looking after the development of new services in both sectors, and newcomers are expected to enter the arena. The mobile operators foresee an increasing share of their revenues coming from new data services, while Internet service providers are attracted to wireless technology and mobility services both to reduce costs within the last-mile segment and to enrich their market share, providing ubiquitous access to the Internet and corporate intranets. In this scenario several wireless overlay networks will coexist, and their interworking will be a challenging objective. The employment of Internet technology, with its novel mobility and security extensions, seems to be the most attractive option for achieving that goal. In addition, the migration to a full IP network architecture, even within each specific wireless domain, will be another promising opportunity, already under consideration within several technical and standardization bodies. The envisioned role of Internet technology makes it worthwhile to undertake significant research efforts on the development of innovative IP-based mobile data systems, and opens promising opportunities for both telcos and Internet service providers.     

基于防火墙的网络安全技术分析

防火墙技术在网络安全中是抵御非法入侵和非法访问的有效手段之一.防火墙的核心思想是在不安全的网际环境中构造一个相对安全的子网环境.文中在介绍了防火墙技术的基本功能的基础上,对防火墙按其所采用的技术进行分类,并详尽介绍各类型防火墙的安全实现策略,并分析了各类型防火墙的优缺点.最后对防火墙的不足和发展前景略作展望.     

用户APN无感知接入技术研究和应用

随着移动互联网的不断发展和智能终端用户的迅速壮大,多APN的组网场景已无法满足用户对互联网业务接入快速、便捷的要求,同时也对移动运营商在移动数据业务方面的推广发展和综合经营收益产生一定制约和影响。本文提出了APN融合网络改造技术,对这一技术的原理和业务流程进行了介绍,并且对其应用的可行性进行分析,为后续全网进行APN融合改造奠定扎实的基础。