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Communications Magazine, IEEE

Issue 7 • Date July 2007

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Displaying Results 1 - 25 of 26
  • Front cover - IEEE Communications Magazine - Front cover

    Page(s): c1
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  • Table of contents

    Page(s): 2 - 4
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    Freely Available from IEEE
  • IEEE Communications Society

    Page(s): 6
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    Freely Available from IEEE
  • ComSoc'sS Journals and Magazines[Presient's page]

    Page(s): 7 - 8
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    Freely Available from IEEE
  • FIRST COMSOC CORPORATE-SPONSORED "WEBINAR" HELD THIS SPRING

    Page(s): 10 - 16
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  • Conference calendar

    Page(s): 20 - 22
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  • Communicrostic puzzle

    Page(s): 24
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    Freely Available from IEEE
  • New products

    Page(s): 25
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  • Guest editorial- Web services in telecommunications

    Page(s): 26 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (70 KB) |  | HTML iconHTML  

    The five articles in this special section focus on Web services in telecommunications. This feature topic provide the readership with a representative snapshot of the state of the art for innovations in Web services for telecommunication and with some concepts that may be immediately applicable to their telephony R&D programs. View full abstract»

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  • A Survey on Web Services in Telecommunications

    Page(s): 28 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (101 KB) |  | HTML iconHTML  

    This article presents a survey of service-oriented architecture and Web services within telecommunications. Telecommunications over the past few years has been in a state of constant flux, with shifts in regulations, increased competition, and technological progress. The article describes these forces in detail and shows that the need for successful adoption of SOA within telecommunication has become a major agenda item for the majority of telecommunication network operators. The article then proceeds to describe SOA and its key enablers in telecommunications - Web services, event-driven architectures, Parlay X/ECMA specifications, and the enterprise service bus. View full abstract»

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  • A business model for dynamic composition of telecommunication web services

    Page(s): 36 - 43
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (105 KB) |  | HTML iconHTML  

    Web service composition is a mechanism for creating new web services from existing Web services. Web service composition enables rapid service creation by reusing existing services. Dynamic composition is composition at runtime. A business model defines the different parties involved in service provisioning and their relationships. However, the existing business models are not suitable for Web service composition. This article proposes a novel business model for dynamic web service composition that is an extension of the standard web service business model. The proposed model is demand-driven, where services can be dynamically composed based on the demand for them. We introduce new business roles and new interactions. We have provided a UDDI-based implementation of our new model by proposing extensions to the subscription API of UDDI. We have developed a proof-of-concept prototype, and have made some preliminary performance measurements. The performance analysis shows that the UDDI extensions incur acceptable performance penalization. View full abstract»

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  • Orchestration in Web Services and Real-Time Communications

    Page(s): 44 - 50
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (96 KB) |  | HTML iconHTML  

    Web services orchestration is now being adopted for the coordination of real-time communications services, including telephony, video and multimedia communications. But do these communications services integrate into workflows in the same way as Web services in the data environment, and are orchestration mechanisms for Web services sufficient for the needs of workflows that involve real-time communications? In this article we explore these questions by taking a look at three approaches to orchestrating workflows: Business Process Execution Language (BPEL), Call Control extensible Markup Language (CCXML), and State Chart extensible Markup Language (SCXML). Through an analysis of these languages, we find that although there are similarities between BPEL as a Web services orchestration language and CCXML/SCXML as orchestration languages for telecom applications, certain key differences, namely procedural vs. event-based representation and coarse vs. fine task granularity, make it more suitable to use these two types of languages together rather than having one replace the other in converged voice-data applications. View full abstract»

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  • Advanced IMS Multipoint Conference Management Using Web Services

    Page(s): 51 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (237 KB) |  | HTML iconHTML  

    The IMS conference control interfaces are still in an early stage of development, allowing only the creation of basic group communication services where the service definition and policy are either preconfigured or managed through proprietary mechanisms. The Web service abstraction for third-party service application development of those native interfaces, the OSA Parlay X multimedia conference Web service, inherits these limitations, therefore constraining the possibilities for advanced multipoint conferencing application deployment over the IMS platform. In order to address these deficiencies, the native IMS conference control interfaces need to be enhanced to provide a broader and finer-grained management environment, while maintaining high flexibility, scalability, and interoperability levels. This article describes the current IMS conferencing framework, at both the native and application-interfacing levels, analyzing its deficiencies and presenting how a deeper involvement of Web services would contribute to overcoming its limitations at both levels. View full abstract»

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  • Composable Mediation for Security-Aware Mobile Services

    Page(s): 58 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (105 KB) |  | HTML iconHTML  

    This article shows how service mediation can be used to add security features to services in a mobile service platform. This base platform takes care of security, charging, and other basic functions, which are then configured for services at runtime using a pluggable mediator framework. Service providers can focus on content, and thus leverage the signaling and mediation capabilities of the core platform. Mediators add specific functionality to a service, and are a specific form of service composition and selection. We examine how security technologies for authentication and authorization are integrated by mediators into a single policy infrastructure with a homogeneous interface for services. We consider here the Web services SAML and the 3GPP GBA security bootstrapping standard in the context of mobile services. We give an example using a video on demand service, and discuss how and when security concerns of services can be transferred from the services to mediators. View full abstract»

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  • Guest editorial - IP multimedia systems in infrastructure and services - PART II

    Page(s): 66 - 67
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  • IMS for Enterprises

    Page(s): 68 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (120 KB) |  | HTML iconHTML  

    We discuss how the IMS architecture is applicable to the enterprise environment, the relevance it has for enterprise users, different options for integrating private and public IMS infrastructures, and the impact of those options on enterprises and IMS service providers. Similarly, we review IMS architecture, discuss the requirements of enterprise communications systems, and present four possible architectures for the use of IMS by enterprises. We also discuss the possibility of using the service oriented architecture (SOA) to integrate IMS-based enterprise communications systems within enterprise information technology (IT) infrastructure. We have built a softswitch prototype based on the IMS architecture. We describe the implementation and the lessons we learned from this experience. View full abstract»

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  • The Operator's Response to P2P Service Demand

    Page(s): 76 - 83
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (200 KB) |  | HTML iconHTML  

    Peer-to-peer (P2P) systems are in high demand for all sorts of tasks-video communication, resource sharing, and content retrieval, to mention a few. However, current P2P solutions are intrinsically incompatible with the IP multimedia subsystem (IMS), the service provisioning framework adopted by the major telecommunication players. We look at ways to develop P2P applications over IMS, identifying the essential service components that pave the way toward interoperable P2P. We discuss the added value that a P2P-IMS solution offers to all parties involved in the service provisioning chain: content provider, third-party service provider, network operator, and ultimately, the user. P2P-IMS brings the power of P2P (increased scalability, availability, resilience, and resource utilization) to the future domain of services, creating a wealth of new business opportunities. Our findings are supported by an IMS-compliant prototype, including a variety of applications. View full abstract»

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  • NetCAPE: Enabling Seamless IMS Service Delivery across Heterogeneous Mobile Networks

    Page(s): 84 - 91
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (149 KB) |  | HTML iconHTML  

    An evolving wireless world is constantly providing users with a wider set of access technologies to choose from, each with different capabilities and properties. In this world, IMS as defined by 3GPP provides an enabling, standardized multimedia architecture that is access independent, hence, providing service convergence. This trend is accompanied by an increasing number of multimode terminals so that inter-access- system-service continuity gains relevance. This article presents the architectural framework of NetCAPE (networking context aware policy environment), which addresses the optimization of mobility management in such a heterogeneous environment while interacting with IMS applications to enable seamless service delivery across heterogeneous mobile networks; even as the mobility offered by the underlying network remains transparent to IMS applications. Although the focus is on 3GPP-based mobile networks, the framework also incorporates wired access technologies, hence, taking a further step toward fixed mobile convergence (FMC). First results are presented highlighting the improvements gained by applying NetCAPE concepts. View full abstract»

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  • Charging in the IP Multimedia Subsystem: A Tutorial

    Page(s): 92 - 99
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (96 KB) |  | HTML iconHTML  

    The IP multimedia subsystem enables a service-rich communication landscape and the convergence of mobile and fixed networks. However, IMS solutions can succeed only when charging for these new services is supported in a flexible and efficient manner. To meet the new challenges, the 3GPP recently introduced a generic charging framework. In this article we give a short overview of the 3GPP charging framework and then describe how IMS charging works with in this framework. To illustrate IMS charging, we discuss an IMS scenario in which three persons with different payment methods conduct a teleconference. View full abstract»

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  • The Threat of Unsolicited Sessions in the 3GPP IP Multimedia Subsystem

    Page(s): 100 - 106
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (129 KB) |  | HTML iconHTML  

    Unsolicited emails distributed by marketers and fraudsters are a growing burden on Internet users. It is expected that with the introduction of low-cost next-generation networks, such as the IP multimedia subsystem, these unsolicited communications will migrate from email and move to voice, video, and instant messaging sessions. Unsolicited voice and video calls are highly disruptive, causing frustration to end users, and they are wasteful of network resources. These communications also may involve fraud, phishing, or the propagation of offensive material. This article highlights the scale of this inevitable problem and proposes mechanisms to enable users to filter their incoming multimedia sessions, such that only legitimate calls are received. This is achieved in a variety of ways including call-pattern analysis, statistical filtering, blacklists, whitelists, and challenge-response mechanisms. View full abstract»

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  • CALL FOR PAPERS - TOPICS IN RADIO COMMUNICATIONS: COMPONENTS, SYSTEMS, AND NETWORKS A SERIES IN IEEE COMMUNICATIONS MAGAZINE

    Page(s): 107
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  • Application-Level QoS Negotiation and Signaling for Advanced Multimedia Services in the IMS

    Page(s): 108 - 116
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (421 KB) |  | HTML iconHTML  

    The IP multimedia subsystem (IMS) has been recognized as a reference next-generation network architecture for offering multimedia services over an Internet Protocol (IP)-based infrastructure. One of the key benefits of the IMS is efficient and flexible introduction of new services and access to third-party application providers, thanks to standard interfaces and standardized service capabilities. To support novel media-rich applications across a wide range of user devices and access networks, IMS must support negotiable quality of service (QoS) for IP multimedia sessions. In this article, we describe the application-level QoS signaling as specified by the 3GPP and propose some enhancements based on advanced QoS parameter matching and optimization functionality to be included along the signaling path. We outline various signaling flow scenarios and discuss them in the context of a case study involving an IMS-supported 3D virtual environment, featuring a treasure-hunt-like game. View full abstract»

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  • IEEE COMMUNICATIONS MAGAZINE CALL FOR PAPERS - NEXT-GENERATION CARRIER ETHERNET TRANSPORT TECHNOLOGIES

    Page(s): 117
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  • Mobility Testbed for 3GPP2-Based Multimedia Domain Networks

    Page(s): 118 - 126
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (127 KB) |  | HTML iconHTML  

    Wireless service providers strive to preserve the quality of service and user experience for mobile users. Several standards bodies are defining architectures that can be used as a platform to provide secure and seamless services to these mobile users. These architectures aim to provide several required functions such as signaling, configuration, security association, encryption, and billing. However, the placement of several functional components and their interaction at several layers contributes to the operational complexity and thus affects the optimal results. Testbed realization of any standardized architecture can help investigate the underlying networking issues. In this article, we describe a mobility test bed implementation based on one of the architecture alternatives of 3GPP2, where the outbound signaling servers are distributed around the edges of the network. We experiment with three different hand-off techniques and analyze the associated experimental results. Analysis of these experimental results and experiences obtained from the testbed implementation can be helpful to any service provider that plans to deploy a version of the MMD (multimedia domain) architecture with distributed signaling servers. 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
Sean Moore
Centripetal Networks