An approach to the multifunction graphic terminal for the ISDNenvironment

The authors describe the current environment of ISDN-like services or trials and predict a likely and promising service menu, based on two years of experience monitoring the INS model system and commercial service in Japan. They propose the integration of various terminal functions into six categories of multifunction terminals that handle voice, data, graphics, and video signals and that could meet the needs of ISDN customers. They describe a prototypical multifunction graphic terminal and the communication services, that it must support     

Basic Concept of Quality Standards for the INS

NTT is proceeding with construction of an advanced digital network called the Information Network System (INS) to meet the increasingly complex telecommunication demands expected in the near future. In providing telecommunication services, it is very important to study the quality levels offered to users, as well as the various functions and tariffs of these services. This paper presents the basic concept of quality standards for the INS from the viewpoint of user requirements. It also discusses the setting up of objectives for quality levels, quality evaluation methods and disclosure of network quality. Quality standards should be the basis for network design and management standards. They should also be an accurate reflection of user satisfaction. Setting such standards requires diversification of quality levels, finding evaluation methods that consider distribution of quality, and establishing quality measurement units appropriate to the nature of INS services.     

Configuration and Characteristics of a Fiber-Optic Video Distribution System

A multiservice fiber-optic subscriber system using wavelength division multiplexing technology has been developed by Nippon Telegraph and Telephone Corporation to provide both 64 kbits/s and broad-band communication services on a single multimode fiber. The subscriber network is formed in a star topology to facilitate bidirectional connection. The system was put in service in March, 1985, as part of the information network system (INS) model system. This paper describes the configuration and characteristics of the video distribution system of this fiber-optic subscriber system. The distribution system uses analog baseband video transmission at a 0.89μm wavelength. The video channel selection is made by an FDM video tuner installed in a central office. The overall performance successfully met design objectives.     

Toward the personal communication era—A proposal of the “radio access” concept from Japan

This paper presents our insights into so-called personal communication and describes a conceptual proposal of radio access, which connects terminals with network services. Firstly, personal communication services are classified into basic (personal connection) services and advanced (personalized) services. Based on this categorization, features of the Japanese Personal Handy Phone (PHP) system, which offers services in homes, offices, and outdoor environments using a small cordless telephone terminal, are presented. The PHP system is defined here as a combination of three functional elements: a digital cordless terminal, radio access, and intelligent network. Secondly, the PHP system is described in detail including service definition, system design, network configuration, and evolutional scenario. Thirdly, we present standardization activities for the PHP-common air interface (CAI). The results of a three-month series of verification experiments, which have been successfully completed in 1992, are also explained. Based on the results, the specifications of PHP CAI were fixed at the end of 1992 through the cooperation of MPT, industries, and network operators. Technical items, mainly the 1.9-GHz 4-channel TDMA-TDD technology, are presented. Concerning R&D activities, the structure of frame synchronization for improving frequency utilization efficiency is described as one example of the many technical breakthroughs made in developing the PHP system. Finally, general considerations on service aspects of the PHP system are presented. This section includes comparisons between PHP and cellular systems from service viewpoints, such as charging, terminal performance, and service coverage area. The important results demonstrate the possibility of the coexistence of and the prosperity of both systems, due to the spread of the outdoor communication market caused by the introduction of the economical PHP system. In addition, our view on the phased approach for future service integration is given.     

Performance analysis of the adaptive EXP/PF channel scheduler in an AMC/TDM system

The adaptive EXP/PF AU; PL. DEFINE "EXP" ALSO channel scheduler proposed in Rhee et al. (2003) is an enhancement to the proportional fairness (PF) channel scheduler in that it guarantees delay sensitive services having the desired service delay outage probability as well as best-effort services in the forward link of an adaptive modulation and coding when used with time-division multiplexing (AMC/TDM) system. In this letter, assuming that there are many best-effort service users and one streaming service user requiring maximum delay constraints of 3 s, the system throughput of the adaptive EXP/PF scheduler is evaluated for different channel conditions of the streaming service user and is also compared with PF scheduler and its upper bound of throughput. The results show that the adaptive EXP/PF algorithm offers high system throughput as well as fairness among best-effort service users and guarantees streaming services of a desired delay constraint and outage probability.     

Advanced service creation using distributed object technology

Rapid technological developments are taking place in computing and telecommunications that provide a wide range of opportunities for the delivery of new advanced multimedia services (telematic services). In this context information networking has a central role, and telecommunications service engineering emerges as an important new scientific discipline. This article examines important issues that underpin the creation of telematic services in a highly competitive environment of service provisioning. The starting point is the proposal of a telecommunications service engineering framework consisting of a service development methodology, a service creation environment, and a service support environment, that considers telematic services as distributed object-oriented applications operating on distributed object platforms. Then the article focuses on the presentation and examination of a complete methodology for the development of telematic services, that "covers" in a systematic and structured manner the entire service creation process. Finally, the proposed methodology is validated by applying it to the design and development of a complex representative telematic service     

信息技术服务运维服务通用要求标准中之备件库应用

信息技术服务标准（Information Technology Service Standards,简称ITSS）是由国家标准化管理委员会、工业和信息化部等政府部门,以及中国电子工业标准化技术协会信息技术服务分会等行业组织发布的,以全面规范信息技术服务产品及其组成要素,指导实施标准化和可信赖信息技术服务的一系列标准,它包括咨询设计、集成实施、运行维护、服务管控、服务运营和服务外包等多个业务领域。在2012年11月5日,《信息技术服务标准运行维护第一部分：通用要求》等3项标准正式发布。《信息技术服务标准运行维护第一部分：通用要求》标准（以下简称通用要求）,提出了运维服务能力建设的通用模型,并在人员、资源、技术、过程等4个要素规定了运行维护提供商应具备的能力。     

A self-adaptive service provisioning framework for 3G+/4G mobile applications

In light of the increasing acceptance of the notion of next generation networks (NGN), which results from the convergence of the fixed and mobile telecommunications, Internet, and entertainment sectors, there is a need for the realization of next-generation service delivery platforms to allow seamless and adaptive provisioning of multimedia information and communication services to mobile users. This means that in such an NGN environment different end systems, access networks, and service platforms have to be integrated. For this highly heterogeneous communications and services environment, we propose a self-adaptive service provisioning middleware framework (ASPF), which, by interoperating with existing wireless and wireline service delivery platforms, aims to enable seamless omnipresent service provisioning to mobile users anywhere, anytime, and in any context. The ASPF is intended to "liberate" applications from space and time limitations, networks, platforms, and device dependences, minimize time-to-market constraints, and eliminate major hurdles that hinder the rapid deployment of new mobile services and applications. Key to this goal is interworking/integration with current SDPs, such as IN/CAMEL, OSA/Parlay, and the emerging IMS.     

飞行器惯导数据在海上靶场测控中的应用

某型飞行器在海上靶场试验中的突出特点是舰载发射、低空、快速(约6马赫)。由于低仰角起始段雷达捕获困难,需要准确的引导数据作为捕获保障。在飞行器试验中,惯导数据插入遥测数据中进行实时传送,利用遥测数据中惯性导航数据实时处理,其结果可以用来解决海上靶场飞行器外弹道轨迹显示,并将其作为引导数据,引导雷达在初始段对目标进行快速捕获。     

运营商以第二屏服务和CDN 增强IPTV业务吸引力

当前,面对未来多屏融合的趋势,全球很多电信运营商都在积极推动"第二屏服务"或者通过改善自己的CDN网络,应对有线电视和互联网电视的挑战。所谓"第二屏服务",可以简单理解为电信运营商将手机或平板电脑演变为电视机的第二屏,增强IPTV等电视业务的吸引力,包括利用手机客户端应用,提供节目搜索、节目竞     

基于二维云模型的网格服务可靠性评价

网格是一个集成的计算和资源环境，具有动态性、异构性、可扩展性和自治性等特点。OGSA是一种新的网格体系架构，是以服务为中心的，提出了“网格服务”的概念。网格服务因网格的特点也具有动态性和不确定性，但是用户在网格进行其业务时，付出了金钱和时间，希望能获得可靠的网格服务。因此，对网格服务进行可靠性评价是关键。提出采用云模型的方法，从多个分指标来综合评价网格服务，这样就可以保证用户可以获得满足其需要的网格服务。     

Terminating telephony services on the Internet

We propose a general purpose service architecture for realizing services which start in the Public Switched Telephone Network (PSTN) but terminate and execute on the Internet. We discuss the needs for such services, our early research efforts in this direction which lead to prototyping certain benchmark services, and the current state of work in this area. We demonstrate the feasibility of the architecture by focusing on services which involve wireline PSTN as well as the wireless aspects (2 G, 2.5 G) of the PSTN. Our methodology is attractive since it keeps each of the domains (PSTN and Internet) unaware as to where the service is executing with respect to which domain actually requested the service. Individual entities participating in the service do not have any knowledge that external entities from another domain also contributed in the execution and fulfillment of such services. Our approach, as embodied in the service architecture, is to leverage the best of the Internet protocols (SIP, XML, HTTP) and technologies (instant messaging, presence) to provide a general framework for personalized service specification and execution.     

Research on user-aware QoS based Web services composition

To improve user experience of composite Web services, a user-aware quality of service (QoS) based Web services composition model is proposed. Under such model, a Web services selection method based on quantum genetic algorithm is proposed. This algorithm uses quantum bit encoding, dynamic step-length quantum gate angle adjustment, neighborhood service search and dynamic punishment strategy to expand search scope and speed up convergence. Simulation experiment shows that this algorithm is more efficient than other existing algorithms in Web services selection.     

Mobile services put in context: A Q-sort analysis

Purpose

Objective of this paper to evaluate mobile services on a limited set of characteristics, e.g. usage context, the Innovativeness of the service, efforts required of users for using the service, the usefulness of the service and the likelihood with which it will be used, in order to show that distinction between services is highly relevant for adoption and acceptance research.

Design/method/approach

In this research the mobile services are object of study and therefore an exploratory approach making use of Q-sort methodology is used.

Findings

The characteristics of the 48 services under study play an important role when judged on the five dimensions. Advanced services, explicitly exploiting the mobile nature of the services like navigation and localization, embedded in all kind of task and process related activities, stood out as the most innovative services, however these are the least likely to be used because they are expected to fit day-to-day routines and usage context the least. Easy to use services and services that fit most contexts are most likely to be used.

Practical implications

Designers of mobile services and applications have to be aware of the subtle interplay between usage context, the service or application to be designed, the ease of use. Only when all these factors are taken into account the services may have value to users.

Original value

This is one of the very few studies focused on mobile services, instead of user perception and behavior. In most research on mobile service adoption and acceptance the characteristics of services are threatened as a black box. This paper shows how relevant it is to look into characteristics of mobile services themselves.     

Over-the-top bundled services in the Korean broadcasting and telecommunications market: Consumer preference analysis using a mixed logit model

Platform service providers in Korea and worldwide have launched over-the-top (OTT) bundled services, which increase market competitiveness. Forecasting the market expansion strategies of these providers can thus shed light on their future actions and influence government policies. In this context, this is the first study to analyze consumer preferences for bundled pay-TV and OTT services. However, due to a lack of market data availability, we conducted a discrete choice experiment and analyzed the marginal utilities of attributes using a mixed logit model. The results demonstrate that consumers expect an additional discount for pay-TV services when bundled with OTT services and that the more bundled services they currently use, the less sensitive they are to the discount rate. Furthermore, we found that OTT and TV broadcasting services have a complementary, rather than a substitute, relationship. Finally, according to a simulation analysis for the Korean broadcasting market, bundling OTT services to expand the market share of pay-TV service providers was largely ineffective.     

IN architectures for implementing universal personaltelecommunications

This article focuses on architectures for providing universal personal telecommunications (UPT) service to wireline users. Although UPT services could be provided to users of wireless phones, thereby giving those users personal communication services (PCS), the wireline environment introduces certain important complications. Unlike "smart" cellular phones, which can register themselves and the user automatically, wireline telephones are unable to automatically detect and register a UPT user. UPT therefore includes a manual registration procedure to associate a PTN with the phone where calls will be received or placed. Also, unlike personal communications terminals that are typically used by only one person, wireline phones are likely to be shared among other users. Therefore, the network must keep track of who is using the phone, so it can provide the appropriate telecommunications services. It would be difficult or impossible to implement UPT as a switch-based service. Fortunately, an intelligent network (IN) architecture that is well suited for implementing UPT is being deployed by many local exchange (LECs) and interexchange carriers (IXCs)     

蓝牙服务搜索协议的实现

为简洁高效地实现蓝牙服务搜索协议,给出了它的实现方法,包括数据元报头的位模实现,服务记录表的构建以及搜索过程的方法。实验结果表明,这些方法不但可以与商用手机实现互相搜索的功能,而且简单,可靠性强,具有较高的应用价值。     

基于Bootstrap技术的Web服务QoS值的置信区间估计和预测

目前对Web服务QoS（Quality of Service）的预测研究,通常预测QoS的静态值,很少预测QoS值的置信区间.本文借助非参数统计学的Bootstrap技术,提出估计Web服务QoS值置信区间的方法;然后利用与当前Web用户相似的其他Web用户调用待预测Web服务的QoS历史数据,预测当前Web用户调用待预测Web服务的QoS值的置信区间.本文估计了WSDream数据集1中每个用户调用每个Web服务的QoS值的置信区间,实验发现这些置信区间的上下限近似服从重尾分布.通过随机选择WSDream数据集1中60%到90%的用户和Web服务作为训练集,预测另外10%到40%的用户和Web服务的QoS值,实验结果表明预测的QoS置信区间与估计的QoS置信区间的平均覆盖率超过70%,最高达76%.在服务选择或服务推荐时给用户提供一个估计的或预测的QoS置信区间,可以更好地满足用户的个性化需求.     

Dynamic Code Assignment Medium Access (DCAMA) Protocol for Wireless Integrated Services Networks

A medium access control (MAC) protocol for wireless mobile networks that supports integrated services and provides quality of service (QoS) support is presented and evaluated via simulation. A controlled random access protocol which allows all terminals to dynamically share a group of spread spectrum spreading codes is used. The protocol provides mobile terminals the access control required for efficient transfer of integrated traffic with QoS guarantees. Two service classes are provided; "best-effort" service, with priority queueing, and reserved bandwidth circuit service. The performance of the protocol is evaluated via simulation for traffic consisting of integrated voice, data and compressed video. The performance assessment measure is packet delay.