新兴的宽带无线接入方式——LMDS

随着电信产业的发展，高速数据通信、VOD等宽带多媒体通信的业务增长很快，所有这些需要一个高质量的用户接入网。文章介绍了一种新兴的无线接入方式LMDS，分析了其系统结构和优点，对它在通信中的应用进行了展望，并且与其它接入方式进行了比较。     

Quality of service in telecommunications. I. Proposition of a QoSframework and its application to B-ISDN

The the quality of service (QoS) concept is becoming an ever more important issue in telecommunication and computer communication. The article focuses on the QoS notion and concept. The definition of QoS in the International Telecommunications Union-Telecommunications Sector (ITU-T) recommendations and the International Standards Organization (ISO) standards is analysed. Little is known about the asynchronous transfer mode (ATM) performance requirements of the broadband integrated services digital network (B-ISDN) services, especially for multimedia applications. This is because the ATM performance requirements of multimedia applications depend not only on the diverse QoS requirements from application and user, but also on the protocol stacks and scheduling in end systems. Therefore, in order to guarantee QoS to the user, it is necessary to introduce a set of QoS parameters whose properties indicate the nature and requirements of the layered protocol stack. We describe how a proposed QoS framework can be applied to B-ISDN as a specific network. The QoS aspects related to B-ISDN signaling (the control plane) and the QoS aspects related to layer and plane management (the management plane) are described. We also describe how the QoS framework resides in a protocol stack and works together with the B-ISDN network management and signaling     

User-oriented measures of telecommunication quality

With the deregulation and emergence of new telecommunication providers in many countries, national and international standards committees have assumed increased responsibility for the cooperative planning of new technology development and the matching of multivendor service offerings with user needs. One important focus of this effort has been the standardization of user-oriented, technology-independent measures of telecommunication service quality. The standardized measures will be used by providers to design and implement telecommunication systems and services, and by users to define telecommunication requirements and select the products that most effectively meet them. The authors discuss in particular call processing, data communication quality, video and voice quality measures     

A multiservice user descriptive traffic source model

The asynchronous transfer mode (ATM)-based broadband integrated services digital network (B-ISDN) dominates the research interest in telecommunications. Traffic and network modeling are the techniques used for performance evaluation and assessment of B-ISDN design alternatives and planning. The specific nature of the ATM technique requires new approaches for traffic modeling. Selecting appropriate traffic source models is an important issue, since it is closely related to the successful design and efficient performance of the networks to be built in the future. The source (multilevel, multiservice structured Markovian) model presented provides a simple way for characterizing the behavior of a telecommunication user recognizing the multilevel discipline of a telecommunication session. The traffic model is general enough to fit a variety of different services by appropriately varying the values of the parameters defining it, but also it is simple enough because it is described by a small number of parameters and the defining parameters make a good intuitive sense by being closely related to actual physical quantities     

Application profile for ISDN

The authors examine some key data processing applications to be used in conjunction with the voice and facsimile services as a platform for deploying ISDN (integrated services digital network) in North America. Special emphasis is placed on the emerging standards of both Accredited Standards Committees (ACS) T1 and X3 in an attempt to harmonize the computer and telecommunication industries towards providing the user with an integrated platform that is vendor-transparent and ubiquitous. This generic platform, which spans a large spectrum of businesses, is presented as a base context for defining user-specific needs and incubating the applications that directly relate to businesses. Distributed transaction processing, electronic data interchange, information retrieval, electronic mail, and file transfer together with seven supplementary services for voice and G4 facsimile are proposed for ISDN deployment in the marketplace. The authors describe how the relevant standards may be exercised through the various ISDN channels and emphasize the value of the North American ISDN User's Forum for commercializing this platform     

Study on Theory and Methods of Telecommunication Tariff

Study on Theory and Methods of Telecommunication Tariff     

A historical perspective of CSTA

Computer-supported telecommunications applications (CSTA) is one of the more important standards for computer-telecommunications interfaces, addressing service and protocol definitions used to provide a link between computers and telecommunications systems. The services provided on a CSTA link between a telecommunications and computer network work much like the services that telecommunication network provides to a user at an access point. At the point of attachment to a telecommunications network, the “phone numbers” are sufficient to describe the desired object for involvement with a service. If a new object were created for the purposes of CSTA (e.g., a monitoring group), an identifier which would work like a phone number in that network would be assigned to that object. Additional handle-identifiers are created and provided after a service is initiated to differentiate between instances of the service being provided. To show this relationship, a functional model was created     

Tackling electrosmog in completely configured 3G networks by parallel cooperative meta-heuristics

The high quality standards required by third-generation systems can be reached only by way of a careful tuning of all the parameters of antenna configurations. However, concerns about exposure to electromagnetic fields should also be taken into account when designing telecommunication networks. In this article we investigate how parallel cooperative meta-heuristics provide the means to achieve both goals: devising a complete network configuration that meets coverage and service quality constraints, and minimizing electromagnetic field levels     

电信传输网的OAM及其发展目标

随着电信网业务量和业务种类的迅速增加,电信网络正变得越来越复杂,对网络的运行、管理和维护（ＯＡＭ）也提出了更高的要求。为此,电信传输网作为提供电信服务的基础设施,必须有效地加以管理和操作,为用户提供优质低价的电信服务。文章描述了在此情况下传输网通道层的ＯＡＭ及其发展。     

基于业务的电信网风险评估方法研究

为了加强对电信网的安全监管,保证电信网的安全运营,针对电信网的拓扑结构,在已有风险评估模型的基础上,提出一种新的定量与定性相结合的风险评估方法。该方法通过分析电信网中某一节点的各个业务的风险,得出被评估节点的风险,进而估算出整个电信系统所面临的总风险。该方法具有较好的可操作性和实用性。     

多媒体视频质量测量的研究和标准化

多媒体视频是电信运营商的重要业务,如何准确地测量多媒体视频质量,反馈给运营商,更好的监测管理,提升客户体验,至关重要.本文将从多媒体视频质量测量的应用需求、主观评价方法、客观测量方法、标准化等几个方面展开研究,重点分析视频视觉质量(PVQ)测量技术,其中无参考测量技术是目前国际研究和标准化的重点.在PVQ测量的基础上,...     

运营网络的安全考虑

运营网络是用户业务的基础通信设施。运营网络的安全在很大程度上直接影响到用户业务的安全，对运营网络和用户网络进行合理的安全分工和范围界定是提高安全成本效益、减少安全盲区的前提。本从基础安全服务、增值安全服务及运营网络的自身安全等三个方面对运营网络的安全进行了分析，并期盼运营网络在信息网络的安全标准、技术和市场导向方面发挥重要的引领和推动作用。     

A Report from Mitaka--INS Model System Experiment Site

Nippon Telegraph and Telephone Corporation (NTT) is now promoting the Information Network System (INS) project, which is expected to be an important part of the basic infrastructure of the coming advanced information society. The purpose of INS is to provide various telecommunication services in a more economical and convenient manner by totally digitalized networks. The INS Model System-a pilot plant-was put into service in September 1984 in Mitaka City, which is adjacent to the Tokyo metropolitan area. This experiment is regarded as a "big" initial step toward the introduction of nationwide INS services. This paper reviews the system as well as service aspect of the experiment, where emphasis is laid on the actual operation status.     

The Efficiency of Traffic Engineering with Regard to Link Failure Resilience

IP networks have established as a global telecommunication platform with increasing user population and an extending spectrum of services. The traffic is also steadily increasing, recently driven by peer to peer networking in addition to client server based applications. Network planers and operators have to ensure the scalability of IP platforms in a permanent upgrade process for transmission capacities. At present, Deutsche Telekom and other telecommunication network providers are introducing traffic engineering methods to achieve an optimum resource utilization.In a first step, traffic engineering can be applied to a predefined network topology, but a comprehensive approach has to be coordinated with a process for upgrading the link capacities and has to prepare for relevant failure scenarios. We have evaluated the efficiency of traffic engineering together with simple link upgrade strategies in order to get a maximum throughput. Therefore a predefined traffic matrix T is taken into account. The optimization goal is to scale the traffic matrix by a maximum factor _max such that the traffic demand _max T can still be carried on the available network resources. The influence of the network topology on the evaluation results is shown in examples with regard to single link failures.     

模糊决策法结合市场调查测量电信新业务偏好度的应用

电信运营商通过市场调查了解用户对业务的偏好度,以便业务改进和营销决策,这种方法已成为管理者常态应用的方法。但是传统的市场调查方法得到用户的消费行为数据实际上单个割裂信息的反应,而没有综合评估多因素的结果。而模糊决策法应用到市场调查中突破了传统方法的瓶颈,为电信运营商进行业务改进、营销方案的制定、精准营销的设计等提供科学参考依据。     

Investigation de la gestion de qualité de service dans le réseau UMTS

Bit rate announced for the future standards of telecommunication, as well as the level of integration reached are, as many factors, determining for the establishment of new applications in mobile terminals. Nowadays, mobile video streaming services are possible. Mobile users expect to receive multimedia traffic with some performance guarantees, so we must ensure the necessary quality of service during the video transmission. This paper aims at investigating quality of service issue inUmts network. More specifically, we explore the main challenge of quality of service management to dynamically optimize the distribution of load inUmts networks. Our investigation is organized in the following way. We formalize the optimization problem which is based on the graph theory and modellingUmts network as well as mobile users and applications to be used. The simulation of our optimization model show a clear improvement of the quality of service perceived by anUmts user in terms of bit rate, blocking and connection drop.     

A Study of Feature Interactions in Intelligent Networks

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Elements of the emerging broadband information highway

General design considerations for the broadband information highway of the future are given in the context of interactive broadband services to the home. As potential precursors to this highway, the telephone, the Internet, and cable television networks are examined. Several emerging technologies are also examined as candidates for the future local subscriber loop. For the information highway, classes of network services are proposed that are independent of the specific network technologies used. It is suggested that the information highway be partitioned logically or physically so as to provide a variety of service levels according to the subscriber's cost and quality of service requirements. This should yield better network economies and provide the end user with a viable range of connectivity options     

P2P流媒体业务技术分析与设计

基于对等网络(P2P)模式的业务和应用给传统互联网带来了巨大的影响,如何更有效地利用P2P技术来发展新的增值业务,是P2P业务开展各方迫切需要解决的问题。新兴P2P流媒体运营商、主流数字媒体运营商、电信运营商业务实现方案及部署思路各不相同。对于电信运营商,目前网络上P2P应用最成熟的模式为P2P直播,初期开展业务容易,用户接受程度较高。建议运营商结合自身的带宽资源对业务流量采用"疏"、"堵"、"用"相结合的手段,先期实现P2P直播业务,逐步尝试开展P2P下载和点播业务,同时加强P2P流媒体业务的安全保障系统方案及开展该业务可能的盈利模式的研究,使P2P流媒体业务成为的电信运营商转型和发展的重要支撑业务。     

电信数据网安全评估中权重的确定方法

进行电信数据网评估不仅要考虑资产的脆弱性被威胁利用的问题,还要考虑资产在网络中所发挥的作用。从ITU-T X.805出发考虑影响电信数据网安全的各种要素及其相互之间的关系,给出了在业务节点下的安全指标体系,并以此为依据计算了资产的安全权重,从而为比较准确地进行电信数据网安全评估提供了一种可行的方法。