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Communications Magazine, IEEE

Issue 2 • Date February 2009

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Displaying Results 1 - 25 of 31
  • IEEE Communications Magazine

    Publication Year: 2009 , Page(s): C1
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  • Table of contents

    Publication Year: 2009 , Page(s): 2 - 4
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  • Certification: Meeting an industry need [The President's Page]

    Publication Year: 2009 , Page(s): 6 - 8
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  • Looking forward, looking back [Certification corner]

    Publication Year: 2009 , Page(s): 10
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  • OFC/NFOEC 2009: Showcasing the future of optical fiber communications, today [OFC Conference report]

    Publication Year: 2009 , Page(s): 12 - 16
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  • The early history of packet switching in the UK [History of Communications]

    Publication Year: 2009 , Page(s): 18 - 26
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (435 KB) |  | HTML iconHTML  

    In this issue of the History Column we bring you an article by Prof. Peter Kirstein, one of the original contributors to early packet switching. We are probably all familiar with the history of the Internet, beginning with its genesis in the American-developed ARPAnet of the late 1960s and early 1970s. We may be less familiar with the contributions of British researchers, as well as those in other countries such as France, at about the same period of time, who worked closely with American researchers as well as independently in developing the packet-switching technology so fundamental to the Internet. Prof. Kirstein recounts the early activities by British engineers, led by Donald Davies of the National Physical Laboratory, the British Post Office, those of his own group at University College London, and others as well. He also ties this work into ongoing activities in the United States at the time. In future History Columns we plan to have similar articles by U.S. packet-switching pioneers on their own early activities in the field. This series of articles on the genesis of the Internet should be of great interest to all communication engineers. We commend the article following to your attention. View full abstract»

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  • Book reviews (2 books reviewed)

    Publication Year: 2009 , Page(s): 28 - 30
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  • IEEE Global Communications Magazine Newsletter - Highlights from IEEE/IFIP manweek 2008: Fourth International Week on Management of Networks and Services

    Publication Year: 2009 , Page(s): 1 - 4
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  • IEEE Globecom 2008 explores the future of networked communications [Conference report]

    Publication Year: 2009 , Page(s): 36 - 37
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  • Conference Calendar

    Publication Year: 2009 , Page(s): 38
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  • New products

    Publication Year: 2009 , Page(s): 39
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  • LTE Part I: Core network

    Publication Year: 2009 , Page(s): 40 - 43
    Cited by:  Papers (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (236 KB) |  | HTML iconHTML  

    Part I of this Feature Topic covers several key aspects of the evolved packet system (EPS) architecture. View full abstract»

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  • The momentum behind LTE adoption [sGPP LTE]

    Publication Year: 2009 , Page(s): 44 - 45
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (37 KB) |  | HTML iconHTML  

    LTE is popularly called a 4G technology. It is an all-IP technology based on orthogonal frequency-division multiplexing (OFDM), which is more spectrally efficient - meaning it can deliver more bits per Hertz. This paper present the video, flay-rate pricing, and connected devices that all contribute to the growing demand for mobile data services. The world of telecommunications, people today are more connected and more mobile than ever. We have more devices and more ways to stay in touch with one another. The Internet and wireline worlds are experiencing a rapid convergence of IP video, audio, and data into completely new applications. Users want that same on-demand access and Internet, multimedia experience, and content anywhere from any device. View full abstract»

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  • Voice call handover mechanisms in next-generation 3GPP systems

    Publication Year: 2009 , Page(s): 46 - 56
    Cited by:  Papers (3)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (153 KB) |  | HTML iconHTML  

    The evolved 3GPP system is a hybrid mobile network architecture supporting several radio access technologies and several mobility mechanisms. In this article we briefly review the architecture and key components of this system, with particular emphasis on how it can support voice call mobility in several deployment scenarios. First, we present the so-called single-radio voice call continuity mechanisms that enable mid-call handover of VoIP calls from E-UTRAN access to the legacy UTRAN/GERAN or lxRTT access. Then we focus on deployment scenarios that do not support voice services on E-UTRAN and present the so-called fallback mechanisms that enable handover from E-UTRAN to UTRAN/GERAN or lxRTT at the beginning of a voice call. Finally, we address the application- layer voice call handover mechanisms enabled by the IP multimedia subsystem. Our conclusion is that the next generation of 3GPP systems are highly sophisticated mobile communication systems that support extended voice call mobility mechanisms, capable of addressing all commercial deployment needs. View full abstract»

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  • Network-based mobility management in the evolved 3GPP core network

    Publication Year: 2009 , Page(s): 58 - 66
    Cited by:  Papers (10)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (119 KB) |  | HTML iconHTML  

    A key aspect of the 3GPP system architecture evolution is the specification of an evolved packet core that supports multiple access networks. The EPC enables operators to deploy and operate one common packet core network for 3GPP radio accesses (E-UTRAN, UTRAN, and GERAN), as well as other wireless and wireline access networks (e.g., eHRPD, WLAN, WIMAX, and DSL/Cable), providing the operator with a common set of services and capabilities across the networks. A key requirement of the EPC is to provide seamless mobility at the IP layer as the user moves within and between accesses. This article provides an overview of the EPC specifications that use a network-based mobility mechanism based on Proxy Mobile IPv6 to enable mobility between access networks. An important facet of providing seamless mobility for a user's sessions across technologies is to ensure that quality of service is maintained as the user moves between accesses. An overview of the "off-path" QoS model to supplement PMIPv6 is also provided. View full abstract»

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  • Policy and charging control in the evolved packet system

    Publication Year: 2009 , Page(s): 68 - 74
    Cited by:  Papers (8)  |  Patents (5)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (106 KB) |  | HTML iconHTML  

    Policy and charging control provides operators with advanced tools for service-aware QoS and charging control. PCC for the evolved packet system, defined as part of the 3 GPP Release 8 specifications, has evolved significantly from previous releases to support multiple-access technologies, roaming, and mobility. Within the PCC framework, a number of protocols have been specified to implement these functions. This article describes key PCC concepts and explains additional amendments to support PCC in the EPS. View full abstract»

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  • QoS control in the 3GPP evolved packet system

    Publication Year: 2009 , Page(s): 76 - 83
    Cited by:  Papers (42)  |  Patents (3)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (122 KB) |  | HTML iconHTML  

    In this article we describe the QoS concept of the evolved packet system, which was standardized in 3GPP Release 8. The concept provides access network operators and service operators with a set of tools to enable service and subscriber differentiation. Such tools are becoming increasingly important as operators are moving from a single to a multi-service offering at the same time as both the number of mobile broadband subscribers and the traffic volume per subscriber is rapidly increasing. The "bearer" is a central element of the EPS QoS concept and is the level of granularity for bearer-level QoS control. The network-initiated QoS control paradigm specified in EPS is a set of signaling procedures for managing bearers and controlling their QoS assigned by the network. The EPS QoS concept is class-based, where each bearer is assigned one and only one QoS class identifier by the network. The QCI is a scalar that is used within the access network as a reference to node-specific parameters that control packet forwarding treatment. This class-based approach, together with the network-initiated QoS control paradigm, gives network operators full control over the QoS provided for its offered services for each of its subscriber groups. View full abstract»

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  • Network access security in next- generation 3GPP systems: A tutorial

    Publication Year: 2009 , Page(s): 84 - 91
    Cited by:  Papers (7)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (124 KB) |  | HTML iconHTML  

    The 3GPP Release 8 long term evolution/system architecture evolution marks the advancement of mobile cellular technology after UMTS-3G. The evolved packet system (EPS) architecture proposed in Release 8 introduces fundamental changes on top of UMTS in several design areas, including security. This article provides a tutorial overview of the proposed security mechanism in EPS. It first gives the background, a brief overview of the overall EPS architecture. It goes on to list the various requirements to be met for EPS security. A description of the EPS security architecture and detailed security procedures are given subsequently. The innovations that have been introduced in EPS, on top of UMTS, are highlighted all through the article. The article concludes by listing some open security issues at the moment. View full abstract»

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  • Multisite field trial for LTE and advanced concepts

    Publication Year: 2009 , Page(s): 92 - 98
    Cited by:  Papers (36)  |  Patents (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1128 KB) |  | HTML iconHTML  

    The 3GPP LTE standard is stable now in its first release (Release 8), and the question is how good its performance is in real-world scenarios. LTE is also a good base for further innovations, but it must be proven that they offer performance advantages for the price of their complexity. This article evaluates the performance of LTE Release 8 as a baseline and advanced concepts currently in discussion such as cooperative MIMO based on system-level simulations, and measurements in the laboratory and a multisite field testbed within the EASY-C project. View full abstract»

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  • Advances in cooperative and relay communications [Guest Editorial]

    Publication Year: 2009 , Page(s): 100 - 101
    Cited by:  Papers (2)
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  • Distributed transmit beamforming: challenges and recent progress

    Publication Year: 2009 , Page(s): 102 - 110
    Cited by:  Papers (118)  |  Patents (2)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (209 KB) |  | HTML iconHTML  

    Distributed transmit beamforming is a form of cooperative communication in which two or more information sources simultaneously transmit a common message and control the phase of their transmissions so that the signals constructively combine at an intended destination. Depending on the design objectives and constraints, the power gains of distributed beamforming can be translated into dramatic increases in range, rate, or energy efficiency. Distributed beamforming may also provide benefits in terms of security and interference reduction since less transmit power is scattered in unintended directions. Key challenges in realizing these benefits, however, include coordinating the sources for information sharing and timing synchronization and, most crucially, distributed carrier synchronization so that the transmissions combine constructively at the destination. This article reviews promising recent results in architectures, algorithms, and working prototypes which indicate that these challenges can be surmounted. Directions for future research needed to translate the potential of distributed beamforming into practice are also discussed. View full abstract»

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  • Cooperative relay to improve diversity in cognitive radio networks

    Publication Year: 2009 , Page(s): 111 - 117
    Cited by:  Papers (94)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (234 KB) |  | HTML iconHTML  

    Recent studies demonstrated that dynamic spectrum access can improve spectrum utilization significantly by allowing secondary unlicensed users to dynamically share the spectrum that is not used by the primary licensed users. Cognitive radio was proposed to promote the spectrum utilization by opportunistically exploiting the existence of spectrum "holes." Meanwhile, cooperative relay technology is regarded widely as a key technology for increasing transmission diversity gain in various types of wireless networks, including cognitive radio networks. In this article, we first give a brief overview of the envisioned applications of: cooperative relay technology to CRNs, cooperative transmission of primary traffic by secondary users, cooperative transmission between secondary nodes to improve spatial diversity, and cooperative relay between secondary nodes to improve spectrum diversity. As the latter is a new direction, in this article we focus on this scenario and investigate a simple wireless network, where a spectrum-rich node is selected as the relay node to improve the performance between the source and the destination. With the introduction of cooperative relay, many unique problems should be considered, especially the issue for relay selection and spectrum allocation. To demonstrate the feasibility and performance of cooperative relay for cognitive radio, a new MAC protocol was proposed and implemented in a universal software radio peripheral-based testbed. Experimental results show that the throughput of the whole system is greatly increased by exploiting the benefit of cooperative relay. View full abstract»

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  • Link-layer-and-above diversity in multihop wireless networks

    Publication Year: 2009 , Page(s): 118 - 124
    Cited by:  Papers (11)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (105 KB) |  | HTML iconHTML  

    The instability of wireless channels was a haunting issue in communications until recent exploration in utilizing variation. The same transmission might present significantly, and usually independently, different reception quality when broadcast to receivers at different locations. In addition, the same stationary receiver might experience drastic fluctuation over time as well. The combination of link-quality variation with the broadcasting nature of the wireless channel itself disclosed a direction in the research of wireless networking, namely, the utilization of diversity. In this article, we summarize the causes of channel diversity in wireless communications, and how it is perceived in different layers of multihop wireless networks. To promote new research innovations in this area, we concentrate on link-layer diversity and speculate on the challenges and potential of diversity schemes at the network layer. View full abstract»

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  • Distributed cooperative MAC for multihop wireless networks

    Publication Year: 2009 , Page(s): 126 - 133
    Cited by:  Papers (37)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (123 KB) |  | HTML iconHTML  

    This article investigates distributed cooperative medium access control protocol design for multihop wireless networks. Cooperative communication has been proposed recently as an effective way to mitigate channel impairments. With cooperation, single-antenna mobile terminals in a multi-user environment share antennas from other mobiles to generate a virtual multiple-antenna system that achieves more reliable communication with a higher diversity gain. However, more mobiles conscribed for one communication inevitably induces complex medium access interactions, especially in multihop wireless ad hoc networks. To improve the network throughput and diversity gain simultaneously, we investigate the issues and challenges in designing an efficient MAC scheme for such networks. Furthermore, based on the IEEE 802.11 DCF, a cross-layer designed cooperative MAC protocol is proposed. The MAC scheme adapts to the channel condition and payload length. View full abstract»

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  • Cooperative network implementation using open-source platforms

    Publication Year: 2009 , Page(s): 134 - 141
    Cited by:  Papers (16)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (487 KB) |  | HTML iconHTML  

    Cooperative networking, by leveraging the broadcast nature of the wireless channel, significantly improves system performance and constitutes a promising technology for next-generation wireless networks. Although there is a large body of literature on cooperative communications, most of the work is limited to theoretical or simulation studies. To impact the next generation of wireless technologies and standards, it is essential to demonstrate that cooperative techniques indeed work in practice. This article describes two programmable cooperative communication testbeds built at Polytechnic Institute of NYU to achieve this goal. The testbeds are based on open-source platforms and enable implementation of cooperative networking protocols in both the physical and the medium access control layer. Extensive experiments carried out using the testbeds suggest not only that cooperative communication techniques can be integrated into current wireless technologies, but also that significant benefits of cooperation can be observed in terms of network throughput, delay, and video quality in real applications. 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