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Communications Magazine, IEEE

Issue 8 • Date Aug. 2006

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Displaying Results 1 - 25 of 28
  • IEEE Communications Magazine

    Publication Year: 2006 , Page(s): 1
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  • Table of contents

    Publication Year: 2006 , Page(s): 2 - 4
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    Freely Available from IEEE
  • The president's page - ComSoc~s professional staff

    Publication Year: 2006 , Page(s): 6 - 9
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  • Note from the editor-in-chief - Surveys

    Publication Year: 2006 , Page(s): 10
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  • Society news - Career and service awards: request for nominations

    Publication Year: 2006 , Page(s): 12
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  • Voice over IP (VoIP) and access to emergency services: a comparison between the United States and the United Kingdom

    Publication Year: 2006 , Page(s): 14 - 16
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (487 KB) |  | HTML iconHTML  

    Regulatory experts tend to think of the United States as the bastion of market-based laissez-faire telecommunications economics and regulation, and conversely to think of European regulators as being notably more willing to intervene in markets. Recent regulatory rulings relating to access to emergency services via voice over IP (VoIP) show the United States to be surprisingly interventionist and the United Kingdom, by contrast, to be far more liberal and temperate. The elements of similarity and of difference between these U.S. and U.K. policies are presented in this paper View full abstract»

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  • Conference calendar

    Publication Year: 2006 , Page(s): 18 - 20
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  • Communicrostic puzzle

    Publication Year: 2006 , Page(s): 21
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  • New products

    Publication Year: 2006 , Page(s): 22 - 23
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  • Guest editorial - Much ado about something

    Publication Year: 2006 , Page(s): 24 - 26
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  • Overview of the optical broadband access evolution: a joint article by operators in the IST network of excellence e-Photon/One

    Publication Year: 2006 , Page(s): 29 - 35
    Cited by:  Papers (27)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (121 KB) |  | HTML iconHTML  

    This article presents an operators' view of the evolution towards broadband optical access networks. First, we describe a possible evolution of the optical access solution for point-to-point and point-to-multipoint architectures. Subsequently, currently available optical access solutions are evaluated and compared. Finally, we consider regulatory issues inside and outside Europe, and conclude by offering a recommendation with respect to regulation View full abstract»

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  • Hybrid optical network architectures: bringing packets and circuits together

    Publication Year: 2006 , Page(s): 36 - 42
    Cited by:  Papers (39)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (136 KB) |  | HTML iconHTML  

    In recent years hybrid optical network architectures, which employ two or more network technologies simultaneously, were proposed. They aim at improving the overall network design by combining the advantages of different technologies while avoiding their disadvantages. In order to structure this developing research field, we classify such hybrid architectures based on the degree of interaction and integration of the network technologies. Also, we discuss the three classes and their main representatives regarding key characteristics, performance benefits, and realization complexity. Finally, we highlight two hybrid architectures and show their key benefits compared to the respective non-hybrid architectures through a dimensioning case study View full abstract»

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  • Optical label switched networks: laboratory trial and network emulator in the IST-STOLAS project

    Publication Year: 2006 , Page(s): 43 - 51
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (191 KB) |  | HTML iconHTML  

    This article reviews the performance of an optical-label-controlled packet routing node as implemented in the European FP5-IST STOLAS project including a set of general engineering rules. Experimental networking scenarios and results from a STOLAS based network emulator supporting optical overspill routing are presented View full abstract»

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  • Evaluation of QoS differentiation mechanisms in asynchronous bufferless optical packet-switched networks

    Publication Year: 2006 , Page(s): 52 - 57
    Cited by:  Papers (12)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (136 KB) |  | HTML iconHTML  

    Existing quality of service differentiation schemes for today's IP over point-to-point optical WDM networks take advantage of electronic RAM to implement traffic management algorithms in order to isolate the service classes. Since practical optical RAM is not available, these techniques are not suitable for a future all-optical network. Hence, new schemes are needed to support QoS differentiation in optical packet-switched (OPS) networks. In this article we first present an overview of existing QoS differentiation mechanisms suitable for asynchronous bufferless OPS. We then compare the performance of the presented schemes and qualitatively discuss implementation issues, in order to evaluate the mechanisms. In particular, we present an evaluation framework, which quantifies the throughput reduction observed when migrating from a best effort scenario to a service-differentiated scenario. Our study shows that preemption-based schemes have the best performance, but also the highest implementation complexity View full abstract»

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  • Advanced data modulation techniques for WDM transmission

    Publication Year: 2006 , Page(s): 58 - 65
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (132 KB) |  | HTML iconHTML  

    This article discusses the various schemes for generating typical advanced modulation formats in terms of configuration and cost, and particularly presents some recently proposed configurations for optical data generation with better performance or reduced components, including pulsed multichannel source generation for return-to-zero (RZ)-based WDM application, multichannel dual-mode pulse source for carrier-suppressed RZ (CSRZ)-based WDM application, CSRZ and CSRZ differential phase shift keyed (DPSK) signal generation using a single Mach-Zehnder modulator (MZM) together with an electrical mixer, chirped RZ generation with reduced modulator number, and RZ/CSRZ-DPSK generation using a single dual-drive MZM and optical minimum shift keying (MSK) View full abstract»

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  • Guest editorial - Advances in service platform technologies for next-generation mobile systems: part 1

    Publication Year: 2006 , Page(s): 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (296 KB) |  | HTML iconHTML  

    First Page of the Article
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  • A context management framework for supporting context-aware distributed applications

    Publication Year: 2006 , Page(s): 67 - 74
    Cited by:  Papers (22)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (334 KB) |  | HTML iconHTML  

    Service platform functions are enablers of adaptive communication services and applications that hide the heterogeneity of the infrastructure, manage personal reachability, manage implicit context, and adapt modality to the context. Furthermore, they can offer a diversity of services, whereby an optimal tradeoff can be made for end users in comfort, cost, security, and mobility. We consider the enablers of context-aware services in distributed environments and present a context management framework that is generic through its hierarchic ordering of context sources and extensible with multiple reasoning realizations. The article focuses on the architectural principles and reasoning methods of the framework View full abstract»

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  • The IMS service platform: a solution for next-generation network operators to be more than bit pipes

    Publication Year: 2006 , Page(s): 75 - 81
    Cited by:  Papers (38)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (206 KB) |  | HTML iconHTML  

    As third-generation (mobile) networks (3G networks) become a commercial reality, strong movements are emerging in the direction of a common infrastructure based on the Internet protocol (IP). The users' mobile devices are like another IP host connected to the Internet. In such a scenario, the network operator infrastructure is degraded to bit pipes. To avoid this, the 3G partnership project (3GPP) and ETSI TISPAN have designed IP multimedia subsystem (IMS), a service platform that aims to place the network operator again in the central role of service provisioning. In this article we examine IMS from a mobile operator's perspective and analyse its possible adaptation to the next-generation networks View full abstract»

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  • Advances in network-supported media delivery in next-generation mobile systems

    Publication Year: 2006 , Page(s): 82 - 89
    Cited by:  Papers (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (147 KB) |  | HTML iconHTML  

    This article presents new concepts for network-supported media delivery in mobile networks. Automatic composition and merging of networks are central parts of these concepts. Media delivery is no longer an end-to-end service that only uses the network as an IP transport. Instead, these concepts create a service-aware network and provide customized delivery support through per-service overlay networks. They also integrate specialized processing nodes as part of the delivery topology, which include transcoders but also more complex processors, such as localized program insertions or personalized spam control. This article describes the underlying concepts and how these new network capabilities for media delivery services are requested, invoked, and managed View full abstract»

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  • Signaling for multimedia conferencing in 4G: the case of integrated 3G/MANETs

    Publication Year: 2006 , Page(s): 90 - 99
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (129 KB) |  | HTML iconHTML  

    Fourth-generation wireless systems are composed of coexisting and cooperating legacy and new networks. Mobile ad hoc networks are examples of new networks. They have several attractive characteristics and are gaining more and more momentum. Their integration with legacy third-generation networks is now being contemplated. Multimedia conferencing is the basis of a wealth of applications, including video conferences, multiparty games, and distance learning. Signaling is the central nerve of multimedia conferencing. It establishes, modifies, and tears down multimedia conferencing applications. This article is devoted to the signaling aspects of multimedia conferencing in 4G and focuses on the specific case of integrated 3G/MANETs. It reviews the standard 3G architecture and the emerging architectures for MANETs. This review shows that none of them is suitable for integrated 3G/MANETs. We propose a new architecture based on application-level clusters and conference gateways. We have implemented a prototype using the session initiation protocol (SIP) technology View full abstract»

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  • Guest editorial - Topics in circuits for communications

    Publication Year: 2006 , Page(s): 100
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (286 KB) |  | HTML iconHTML  

    First Page of the Article
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  • A dual-antenna phase-array ultra-wideband CMOS transceiver

    Publication Year: 2006 , Page(s): 102 - 110
    Cited by:  Papers (2)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (760 KB) |  | HTML iconHTML  

    Ultra-wideband (UWB) systems use high-bandwidth signals to enable a new generation of ultra-high-data-rate wireless applications. Implementation of a high-bandwidth RF system in the 3-5 GHz band presents challenges that can be solved by circuit and system techniques. This article looks at the motivation and requirements for a WiMedia-compliant UWB system implemented for a target application in wireless video transmission. It explores the circuit-level trade-offs in CMOS radio and some of the system-level methods, such as selection diversity and equal-gain combining, used to increase robustness in multipath and interference environments. The radio (S. Lo, 2006) is part of a two-chip solution that includes a digital baseband chip that implements the WiMedia-compliant PHY and MAC. The measured results of the 0.18 mum CMOS UWB transceiver demonstrate the efficacy of these techniques in the final RF and system performance View full abstract»

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  • Software-defined radio receiver: dream to reality

    Publication Year: 2006 , Page(s): 111 - 118
    Cited by:  Papers (35)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (163 KB) |  | HTML iconHTML  

    This article describes a fully integrated 90 nm CMOS software-defined radio receiver operating in the 800 MHz to 5 GHz band. Unlike the classical SDR paradigm, which digitizes the whole spectrum uniformly, this receiver acts as a signal conditioner for the analog-to-digital converters, emphasizing only the wanted channel. Thus, the ADCs operate with modest resolution and sample rate, consuming low power. This approach makes portable SDR a reality View full abstract»

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  • A low-power dual-mode video decoder for mobile applications

    Publication Year: 2006 , Page(s): 119 - 126
    Cited by:  Papers (2)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (269 KB) |  | HTML iconHTML  

    The objective of this article is to highlight design challenges for low-power and dual-video standard requirements, especially in mobile applications. Due to the advent of the newly announced H.264, a generic problem of standard incompatibility has appeared between H.264 and prevalent MPEG-x video standards, which must be resolved on both algorithmic and architectural levels. Furthermore, several low-power techniques targeted at achieving lower memory requirements and processing cycles are also described and discussed View full abstract»

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  • Globule: a collaborative content delivery network

    Publication Year: 2006 , Page(s): 127 - 133
    Cited by:  Papers (20)  |  Patents (10)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (146 KB) |  | HTML iconHTML  

    We present Globule, a collaborative content delivery network developed by our research group. Globule is composed of Web servers that cooperate across a wide area network to provide performance and availability guarantees to the sites they host. We discuss the issues involved in developing and setting up a large-scale collaborative CDN and provide solutions for many of its unique problems 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