数字通信网技术的发展历程

本文简述通信技术的发展过程，分别说明数字电话通信网，公用和专用数据通信网，窄带和宽带综合业务数字网，通信网信令系统，全光通信网，智能网和个人移动通信网的技术进展。最后总结未来的Ｂ－ＩＳＤＮ是宽带、高速的光纤通信网和未来的ＰＣＮ是全球移动卫星的微波通信网，两者联合组成国家通信网基础结构。     

光纤传输在各种通信和广播网中的应用

本文阐述光纤传输系统在公用通信－宽带综合业务数字网（Ｂ—ＩＳＤＮ），在专用通信－局域网与城域网（ＬＡＮ／ＭＡＮ），在有线电视广播网（ＣＡＴＶ）以及在移动通信蜂窝网（ｃｅｌｌｕｌａｒ）等各种通信网和广播网中的应用，并介绍它们的特点、相互差异，以及发展趋向。     

移动智能网技术的研发现状及未来发展

本文对我国移动智能网的应用和发展进行了总结,介绍了移动智能网的最新标准演进情况;对第三代移动通信系统中智能网与移动网融合进行了分析;结合智能网应用中出现的不足,综述了移动智能网研究的关键技术和发展趋势;对近期的热点移动智能业务进行了概括介绍;对我国移动智能网的进一步建设和发展提出几点建设性的意见.     

智能网与先验位置信息在呼叫连接中的应用

在个人通信以及联网寻呼中，怎样能够以最小的网络负载和最少的费用最快地期望的用户，最值得研究的问题。本文基于智能网提出了先验位置信息的概念，并给出了这种信息在位置登记器中的应用算法。计算机性能模拟显示它使原有的位置登记器中的智能网性能得到了改善。     

新一代数字交换系统—5ESS—2000

５ＥＳＳ－２０００是１９９２年推出的新一代数字交换系统。本文在简介其分布系统结构的基础上，着重说明５ＥＳＳ－２０００的组网优势及如何适应ＩＳＤＮ、ＩＮ和ＰＣＮ的发展。     

移动智能网系统及其在我国的发展

与移动网的结合是智能网研究的新方向。ＥＴＳＩ提出的ＣＡＭＥＬ方案用来在ＧＳＭ网络中提供智能业务。北京邮电大学程控交换与通信网国家重点实验室在其已成功应用的固定智能网ＣＩＮ０２系统的基础上,参照ＣＡＭＥＬ方案推出了ＣＭＩＮ０２移动智能网系统。现在该系统可提供预付费业务、移动虚拟专用网业务和通用接入码业务。     

Integrated Services over ATM/MAN-Based Personal Communication Networks

IEEE 802.6 metropolitan area networks (MANs) providean efficient architecture for supporting wirelesspersonal communication services (PCSs) overmetropolitan areas by interconnecting wireless basestations into personal communication networks (PCNs).They also serve as peripheral gathering networks totransport PCS traffic over a wide area broadbandintegrated services digital network employingasynchronous transfer mode (ATM), enabling integrationof PCNs in different cities into a global PCN. Bycombining the various access methods and employing adynamic bandwidth integration scheme, a MAN canfunction as a powerful distributed switch forintegrating different types of local traffic.Simulation results are presented to illustrate theadvantages of the integration scheme. To provideubiquitous PCS, we also propose a simplesuffix-dialing method for integrating telephone, fax,paging and email services over the ATM/MAN-based PCNsusing a single personal telecommunication number. Withthis method, the current practice of printing a longlist of phone numbers on one's business card will nolonger be necessary.     

Personal Communications in the UK—Implementation of PCN using DCS 1800

Personal Communication Networks (PCNs) aim to establish a mass market for mobile communications and provide a competitive alternative to the wired PSTN. This paper explains how the DCS 1800 cellular network standard was developed to provide an appropriate technical basis for the implementation of PCN services. Particular attention was given to RF parameters, small cell radio networks, standardized network interfaces, and enhancement of coverage areas by infrastructure sharing between operators.     

A radio system proposal for widespread low-power tetherlesscommunications

It is suggested that low-power digital radio as an access technology could be integrated into a local exchange network to provide a ubiquitous personal communications network (PCN). High-quality tetherless communications services that could be provided by such an exchange-network-based PCN are described. A possible low-power exchange access digital radio system for providing these exchange-network based PCS services is discussed. The radio system uses a spectrum-efficient time-division multiple-access (TDMA) architecture made possible by advanced digital signal processing techniques. Control of the frequency reuse system is described, and frequency spectrum needs are indicated     

Implementation of PCNs using DCS 1800

The digital cellular system (1800 MHz) (DCS 1800), a standard for personal communication networks (PCNs) that has been developed by the European Telecommunications Standards Institution (ETSI), is discussed. The GSM 900-MHz cellular standard, from which DCS 1800 is derived, is reviewed. GSM/DCS 1800 network interfaces and signaling, implementation of PCNs using DCS 1800, PCN cellular design, PCN transmission networks, and the services and functionality of DCS 1800 are described