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Communications Magazine, IEEE

Issue 9 • Date Sept. 1996

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Displaying Results 1 - 18 of 18
  • Asynchronous Transfer Mode Networks: Performance Issues [Book Review]

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    Freely Available from IEEE
  • Distance Learning Technology and Applications [Book Review]

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    Freely Available from IEEE
  • Making TMN a Reality [Guest Editorial]

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    Freely Available from IEEE
  • ATM transport network operation system in Japan

    Page(s): 70 - 75
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    An asynchronous transfer mode (ATM) transport network operation system conforming to the telecommunications management network (TMN) architecture has been designed, implemented, and deployed by NTT Japan. This operation system has a distributed architecture with a managed object location transparency function and has been developed using a state-of-the-art development toolkit in order to reduce the development time and number of developers. View full abstract»

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  • PCS global mobile satellites

    Page(s): 132 - 136
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    As the new era dawns in wireless information systems, mobile satellite services (MSS) are emerging as an integral component in what has become the turn-of-the-century global communication network. It is generally agreed that the universal personal communication paradigm is the confluence of terrestrial-based and satellite-based systems. PCS users will neither know nor care if their calls are being carried by satellite or cellular. Unlike their terrestrial-based counterparts. The MSS, with their global blanket coverage, are truly able to realize the vision of communications from anywhere at any time for people on the move. The MSS are also being used in developing countries without existing wireline networks to provide rapid, ubiquitous telephone service. This article provides an overview of mobile satellite systems and concepts. The materials presented are geared toward a broad audience with engineering or management back grounds View full abstract»

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  • Approaches for introducing TMN in legacy networks: a critical look

    Page(s): 55 - 60
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    Introducing the telecommunications management network (TMN) into a legacy network is generally an uphill battle. This article provides a critical review of the two key approaches used in the industry for introducing TMN interfaces into legacy networks. Before the analysis, it is of prime importance to establish some ground rules. There is currently no common understanding of what introducing TMN into a legacy network means, as there is no common understanding of what introducing TMN into a network means. We start by analyzing what introducing TMN into a legacy network means, and then study, successively, the bottom-up and top-down approaches. Finally, a cost trade-off analysis is made View full abstract»

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  • On location management for personal communications networks

    Page(s): 138 - 145
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    Personal communications services (PCS) support mobile terminals (MTs) which are free to travel within the service coverage area. In order to effectively locate an MT when a called is initiated, location management schemes are used to keep track of the locations of the MTs. The current approach to location management requires each MT to report its location to the network periodically. The location information is then stored in databases. When a call is initiated. The network determines the current location of the called MT through a database lookup and paging procedure. A currently available standard for location management is described. Research results on location management are surveyed in detail View full abstract»

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  • Intelligent network: a key platform for PCS interworking and interoperability

    Page(s): 98 - 105
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    The Tl and TIA standards committees in the United States have worked jointly on the development of the first phase of personal communication services (PCS) standards, which were approved in December 1995. PCS systems based on these standards are currently under development. As these systems are deployed, the variety of wireless systems will grow, making interworking and interoperability a key challenge. This article provides an overview of PCS standards and explores how the different types of wireless systems (PCS and cellular) will utilize the capabilities of the intelligent network to provide seamless roaming View full abstract»

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  • Architecture for interworking data over PCS

    Page(s): 124 - 130
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    This article presents a new approach for wireless service providers to offer data services by taking advantage of the existing infrastructure for voice services and interworking with existing wireline-based data services. The article presents a framework: for interworking between any wireless radio system and any data application on the wireline network. The interworking is provided by a common interworking function that uses a generic interworking control protocol (ICP). Any radio system capable of using the ISDN-based C-interface and implementing ICP can take advantage of the proposed approach. ICP is a generic protocol and can be implemented using different networks. The article considers an ISDN network for the lower-layer transport of ICP. Though the article focuses on interworking with the PSTN and the Internet, the architecture also allows access to other data networks View full abstract»

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  • Integration and evolution of existing mobile telecommunications systems toward UMTS

    Page(s): 90 - 96
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    This article indicates potential evolutionary scenarios from several starting points toward the target UMTS and investigates additional options for potential cooperation between existing systems. The definition of any evolution process should start with the definition of the process's target; therefore, the author provides a brief description of the target UMTS. Five evolution scenarios toward UMTS are introduced, including a fixed network offering intelligent network and cordless terminal mobility services, cellular networks (i.e., GSM), cable networks offering wireless local loop, satellite networks, and a standalone UMTS scenario. Cooperation options for the identified systems and operators are identified View full abstract»

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  • A CMIS-capable scripting language and associated lightweight protocol for TMN applications

    Page(s): 82 - 87
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    In the absence of standards for the telecommunication management network (TMN) F interface, interoperability of workstation applications can be based on the Q3 interface; Common Management Information System (CMIS)-capable interpreted scripting languages and associated lightweight string-based protocols can support the rapid construction of lightweight, portable TMN workstations View full abstract»

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  • Design trade-offs in cellular/PCS systems

    Page(s): 146 - 152
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    With the increasing demand for all kinds of wireless access services, including cellular/PCS, wireless local loop, and broadband access, the system architects will have opportunities to design new communication systems, not necessarily based on existing wireless standards. In the design of wireless communication systems, there are usually multiple objectives such as low cost, small size, high reliability, and large capacity. The system architect would need to study the trade-offs among different combinations of modulation, coding, multiple access, and antenna techniques to determine the best design. In this tutorial we focus on the trade-offs between user bandwidth and multi-user interference in order to maximize the system capacity. The design trade-offs are depicted on a B-γ0 plane. Where B is the user bandwidth and γ0 is the carrier-to-interference ratio (C/I). For F/TDMA and CDMA systems, the author first shows that the contours of equal system capacity are straight lines with different slope's depending on the propagation environment, and the capacity decreases for increasing B and γ0. Then as feasible solutions, the author plots the different combinations of modulation and coding with diversity to satisfy a certain quality of service in a multipath environment. The best design is obtained by moving a line with a certain slope from the lower left corner in the B-γ0 plane until it touches the first feasible solution. From these plots we can see that, for example, while 1/2-rate channel coding is the best choice for F/TDMA systems, 1/3-rate is better for CDMA systems View full abstract»

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  • Implementing OSI agent/managers for TMN

    Page(s): 62 - 67
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    The telecommunications management network (TMN) architecture defines a framework for the management of telecommunications networks and services. It is based on a set of TMN standards developed by the International Telecommunications Union (ITU-T), and is finding increased interest in the telecommunications industry, where rapid development of services and open architectures are in demand. Open systems interconnection (OSI) agent/managers as defined by the OSI systems management standards play a major role in the TMN architecture. However, the complexity of these standards, make the implementation of agent/managers and thus TMN systems a challenging task; methodologies and tools to ease the task of building agent/managers are needed. This article discusses the key difficulties in building OSI agent/managers and presents an architecture and a toolkit that can overcome them. The toolkit automates the generation of code that conforms to TMN and OSI standards, allowing the implementor to focus on the implementation of agent and manager specific components using the facilities provided by the toolkit View full abstract»

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  • Supporting PACS on a GSM MSC

    Page(s): 114 - 123
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    The personal access communications system (PACS) is one of the ANSI air interface standards developed for the 1.9 GHz PCS band in the United States. PACS been optimized for both indoor wireless access and low-mobility pedestrian outdoor usage. The Global System for Mobile Telecommunications (GSM) system is widely deployed in Europe and Asia and is being considered for many other regions around the world. A natural evolution path for PCS would be one that combined the advantages of PACS with readily available GSM network capabilities. This article addresses solutions to interfacing a PACS radio system to a GSM or GSM-derivative network at the GSM A-interface View full abstract»

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  • Heterogeneous personal communications services: integration of PCS systems

    Page(s): 106 - 113
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    Personal communications services (PCS) are being introduced to offer ubiquitous communication. In its first phase PCS consists of a plethora of systems that address cellular, vehicular, cordless phone, and a variety of other services. The integration of these different systems is referred to as “heterogeneous PCS (HPCS)”. We describe the various PCS systems available and address in detail the issue of PCS systems integration. Key implementation issues for integrating PCS systems are defined and discussed View full abstract»

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  • TMN and the implementation of electronic bonding

    Page(s): 76 - 81
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    This article discusses the experiences learned in the implementation and deployment of electronic bonding. Electronic bonding refers to the use of TMN-based protocols for the exchange of information between service providers. This is one of the first major deployments of TMN in the U.S. telecommunications network. As was learned during this process, the development of standards is only a starting point. Many additional agreements and decisions must be made in order to achieve deployment of TMN-based interfaces View full abstract»

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  • Capture division packet access: a new cellular access architecture for future PCNs

    Page(s): 154 - 162
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    The authors describe a new cellular access architecture, known as capture-division packet access, which is a packet-oriented architecture able to support the constant bit rate traffic and variable bandwidth on demand necessary for multimedia traffic. The approach integrates the multiple access and channel reuse issues to achieve a high degree of spectral efficiency, and presents general advantages even if used for delay-constrained circuit-oriented traffic. Unlike CDMA and TDMA, wherein the effective data rate of each connection is typically a small fraction of the total radio channel allocated for PCN, the CDPA approach allows each user to access the entire channel, if necessary, for brief periods of time (packet access). Spectrum sharing is accomplished by exploiting the different path losses suffered by the various signals as they appear at the base stations (the capture effect), with co-channel interference abated through time diversity (colliding users do not successively retry in the same time interval). Results suggest that abating co-channel interference by random retransmission may be more effective than spatial isolation at cells using the same channel, as is usual in FDMA-TDMA systems View full abstract»

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Aims & Scope

IEEE Communications Magazine covers all areas of communications such as lightwave telecommunications, high-speed data communications, personal communications systems (PCS), ISDN, and more.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Osman Gebizlioglu
Huawei Technologies