Parlay-based service engineering in a converged Internet–PSTN environment

This paper examines current approaches to signalling and service interworking between Internet and public switched telephone network (PSTN). It notes that until now convergence between the two networks has for the most part taken place in the transport and signalling layers. Signalling interworking architectures cater for the specific class of telephony-like services and although they can accommodate the extension of the intelligent network's (IN) realm of control in the Internet, they do not provide a generic platform for service interworking. Through the adoption of the Parlay APIs, a way is foreseen for (a) consolidation of telephone service over both Internet and PSTN through the imposition of a uniform call control API while allowing the installed IN infrastructure to be used also for Internet telephony services and (b) for service interworking between telephony-like services and open distributed services in the Internet. The paper proposes a service architecture that can be used as a platform for Parlay-based service interworking while offsetting some drawbacks that the Parlay approach incurs.     

A pragmatic approach to service interaction filtering between call control services

Triggered by the deregulation of the telecommunications market, it is expected that the number of services deployed in the telecommunications network will increase dramatically in the near future. It is expected that these services will be interworking. However, as widely reported, interworking services will be subject to the service interaction problem. It is essential to cope with the problem in a developing multi service provider environment as it may substantially delay service deployment and hence form a serious obstacle to rapid service provisioning.In order to cope with the increasing number of services deployed in the network, previous work suggested the application of filtering approaches. This paper suggests such a technique. It is pragmatic in nature and does not require detailed service knowledge. Furthermore, it is shown how the approach can be incorporated into an overall comprehensive service interaction management process. Even though the approach is applied to call control aspects only, it could be extended to cover other areas.     

An overview of NTTs digital transmission networks - existing and planned

This paper presents recent utilization trends of data communications circuits, telephone and telex networks and describes the digitalization and integration plan of NTT network facilities for telecommunications services. Secondly, this paper describes public data network development activities in NTT since 1971, and the features and current status of circuit-switched and packet-switched data networks. Finally this paper describes the telephone - network - Packet - network interworking system developed by NTT and future topics related to packet switching service.     

因特网与电信智能网的比较与互通方案分析

因特网与电信智能网的互通是目前网络技术的一个研究热点。互通的动机是为市场提供更多、更好和更新型的服务。该文比较了因特网与电信智能网的差异和各自的优劣，分析了正在研究和发展的3种互通方案。     

Windows 2000: a threat to Internet diversity and open standards?

Microsoft conceived Windows 2000 as the operating system for the Internet. This gave many people pause for thought, what with Microsoft's less-than-sterling reputation regarding cohabitation of competitors' software on their operating system. The Internet is based on open standards and interworking between different systems from different suppliers. If Windows 2000 compromises the Internet's integrity and ubiquity-two of its primary hallmarks-will it really be the best operating system to base your Internet services on? Some of the new additions to Windows 2000 show that, although Microsoft pays lip-service to the Internet's sacred tenets of openness and support for standards, it has actually (and sometimes only subtly) removed or subverted these tenets. The Windows 2000 changes appear to subtly exclude technologies from other vendors and make interworking more difficult     

一种GPRS和WLAN相互融合的方案

文中提出了一种将WLAN和蜂窝移动通信网相融合的方案，能够以较高的速率，在热点地区提供大多数数据服务。文章主要讨论了GPRS和WLAN融合的总体设想，并分析了两种网络的互通结构，指出了这种结构的优缺点。     

移动智能网与移动互联网的互通研究

移动智能网与移动互联网的互通与结合可以使移动智能网提供丰富的语音/数据综合业务,同时也解决了预付费业务用户无法使用移动互联网的问题。综述了移动智能网与移动互联网互通的研究成果,在此基础上提出了一个完整的互通体系结构,详细介绍了新的业务属性和业务,并分析了基于移动互联网的业务管理和业务控制的计费策略。     

IMS 与3G 电路域中多媒体彩铃业务的互通

从3G（3rd-generation,第三代移动通信）R5版本开始,电信核心网引入了IMS（IP Multimedia Subsystem）域,并致力于为用户提供跨网络的,一致性的服务。分别介绍了多媒体彩铃业务在3G电路域,IMS域中的典型实现方式及其信令流程,在此基础之上重点探讨异构网络中多媒体彩铃业务的互通。     

1984/1988 X.400 recommendations — user requirements

An evaluation of the 1984 and 1988 CCITT X.400 series of recommendations is given with particular reference to the use of a Message Handling System (MHS) for interpersonal communication. The human user's needs in electronic communication are studied. Based on these findings, the technical quality of the services provided are evaluated, as is the support of the human factors in communication. MHS is evaluated in terms of its suitability for the individual user and the applicability for communication in groups. Message handling services are presented and compared with user requirements. In particular, the new services of the X.400 recommendations of 1988 concerning interworking with Directory Services (DS), the security model, message store and distribution lists are examined to determine how they meet the needs of the human user, and how they could be used or extended to improve communication in groups.     

A framework for multiple coordination languages

The Web has become a world of services offered by Web agents. Although they provide attractive value in isolated operation, collaboration amongst Web agents from different origins could lead to more sophisticated services. Enabling for such an interworking would be the integration of platforms on which these agents operate. We take two coordination languages, namely Linda and KQML, and develop a model and framework which allows it to describe and implement both languages.     

IN和Internet互通综述

针对IN与Internet互通的研究状况进行综述,并对互通的功能模型,接口和信息流以及互通支持的业务进行了分析。     

IN和Internet互通接口研究

文章在分析IN与Internet互通概念模型和功能模型的基础上对互通接口问题进行了深入研究;对支持PINT业务的网关实体的功能、配置位置和模型进行了分析,并对INAP的操作进行了扩展。     

Managing feature interactions between distributed SIP call control services

The Session Initiation Protocol (SIP) is widely used as a call control protocol for Voice over IP (VoIP), and indeed commercial implementations are readily available off-the-shelf. SIP supports flexible service provisioning not only through third parties, but also end-users. Laboratory experience shows that as these services are interworking they are subject to the feature interaction problem. Feature interactions may considerably delay service deployment and hence are a threat to rapid service provisioning.This paper investigates the feature interaction problem in SIP-based services and investigates the application of a pragmatic approach. This runtime approach does not require any detailed information about the services and hence can be applied in a competitive market. Furthermore, the technique is particularly strong in handling interactions between distributed services – a key characteristic of SIP-based services. Moreover, the approach is fully distributed without any centralised components, and includes detection and resolution of feature interactions.     

支持智能网与IP网互通的呼叫/承载网关的设计与实现

Internet用户对电信新业务的需求促使智能网与IP网实现互通。该文首先介绍了两网互通的模型,并重点描述了该模型中的重要实体—呼叫/承载网关的功能。在此基础上,文章提出了两种呼叫/承载网关的实现方案,分析比较了它们各自的优缺点,并基于其中一种方案详细描述了呼叫/承载网关的软件结构     

3G与WLAN互连的安全协议和分析

随着无线互联网的发展,第3代移动通信系统(3G)与无线局域网(WLAN)的互连也成为研究的热点。3G系统的优势在于计费管理、漫游与安全性,WLAN系统的优势在于高带宽和低投资成本。通过3G与WLAN的互连可以实现优势互补。论文介绍了3G与WLAN互连的体系和安全结构,综述了互连的安全协议,分析了互连面临的安全挑战,并指出了现有的安全机制所存在的不足,探讨了下一步研究的方向。     

OSI standards: application to data communication and telematic services and Italian strategy for their introduction

The demand for data communication services as well as the development of new telematic services in the TLC environment will find their benefit from the application of the OSI standards.

These standards have reached a sound degree of definition in the last years due both to continuous improvements in the standardization activity and to increasing realizations from various manufacturers.

There is no doubt that the effective application of the OSI standards represents the challenge of the next years, which will conditionate the whole development of distributed data processing and telematic applications.

The paper presents the strategy followed in Italy for the adoption of the OSI standards, which is based on a step by step approach, where each standard is introduced on the basis of its complete definition. Initial consideration is given to the application of the MHS Standards (X400).

After a general discussion on the OSI Standards application, the paper further details on the provision of the OSI Network Service (OSI-NS) by different public data networks and on the use of such service for interworking among networks of different type. Furtheron, cases of interworking scenarios with networks not providing the OSI-NS are also examined.

Finally the paper details on the activity being pursued in Europe for the harmonization of the OSI standards and their certification.     

Siting park-and-ride facilities using a multi-objective spatial optimization model

Park-and-ride services are an important component of many public transportation systems in the United States. Locating park-and-ride facilities is an essential step when planning for these services. In this research we focus on three major siting/modeling concerns that need to be addressed when siting park-and-ride facilities: covering as much potential demand as possible, locating park-and-ride facilities as close as possible to major roadways, and siting such facilities in the context of an existing system. Unfortunately, existing models do not enable each of these concerns to be simultaneously addressed. This paper presents a multi-objective spatial optimization model for integrating these considerations. This model is applied for siting park-and-ride facilities in Columbus, Ohio. Application results show the usefulness of the developed model in supporting transit planning in an urban region.     

ATM traffic transfer via queued-arbitrated DQDB

The easy and cost effective interworking of Distributed Queue Dual Bus (DQDB) and Asynchronous Transfer Mode (ATM) protocols is of prime importance for the evolution of the broadband integrated services digital network (B-ISDN) and the long-term success of MANs as tributary networks. In this paper, we study several practically useful scenarios for the interworking of ATM Customer Premises Networks (CPN) through a transit DQDB network. Suitable Interworking Unit (IWU) protocols are presented and compared. It is shown that the most advantageous solution in terms of service quality and IWU simplicity and robustness is the use of a Connection Oriented (CO) DQDB service exploiting the Queued-Arbitrated mode of access. Also, the provisions required in the definition of a CO DQDB service are pointed out. Finally, the implementation of an IWU applying the ideas presented is outlined.     

开放的异种对象标识及绑定机制研究

随着各种分布对象计算系统的广泛使用,异构对象系统之间的互操作已成为必要。其中,ＣＯＭ／ＣＯＲＢＡ互操作是最为迫切的,很多ＣＯＲＢＡ产品遵照ＯＭＧ组织的ＣＯＭ／ＣＯＢＡ互操作规范提供了互操作功能。然而规范中异种对象的标识及绑定机制存在问题,影响了应用程序的可移植性和互操作系统之间的互操作性。文中将互操作中异种对象的标识和绑定机制形式化地描述为异种对象标识空间的映射,在此基础上归纳出３种对象标识方法和     

基于ATM和Internet的视频点播系统的设计与实现

本文探讨了基于ATM和Internet传输视频点播业务系统的基本原理和实验实现。该系统由业务代理器和交互工作单元组成,业务代理器控制系统内的资源分配及业务指南,交互工作单元在代理器的控制下实现各种功能转换,包括：数据传输协议转换、比特率控制、业务网关转换、业务量监测。