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Network, IEEE

Issue 2 • Date March-April 2012

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Displaying Results 1 - 11 of 11
  • IEEE Network

    Page(s): c1
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    Freely Available from IEEE
  • Table of contents

    Page(s): 1
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    Freely Available from IEEE
  • Editor's note

    Page(s): 2 - 3
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    Freely Available from IEEE
  • Next-generation optical access networks: Dynamic bandwidth allocation, resource use optimization, and QoS improvements [Guest Eeditorial]

    Page(s): 4 - 6
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    Freely Available from IEEE
  • Network operator requirements for the next generation of optical access networks

    Page(s): 8 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (172 KB) |  | HTML iconHTML  

    This article describes FSAN operator perspectives on the drivers and system requirements for fiber access beyond 10-Gigabit-class PON systems (i.e., NG-PON2 in FSAN terminology). Additionally, a review of potential solutions in scope for NG-PON2 is given in the context of these operator drivers and requirements. View full abstract»

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  • NG-PONs 1&2 and beyond: the dawn of the uber-FiWi network

    Page(s): 15 - 21
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (260 KB) |  | HTML iconHTML  

    This article reviews the main thrusts in next-generation passive optical network 1 and 2 technologies that enable short-term evolutionary and long-term revolutionary upgrades of coexistent gigabit-class PONs, respectively. It provides insight into the key requirements and challenges of the major candidate NG-PON 1&2 architectures such as long-reach XG-PON, wavelength-routing WDM PON, OCDMA and OFDMA PON, and reports on recent progress toward enhanced data and control plane functionalities, including real-time dynamic bandwidth allocation, improved privacy and guaranteed QoS, bandwidth flexibility, as well as cost-effective in-service monitoring techniques for NG-PONs. We then elaborate on converged optical fiber-wireless access networks, which may be viewed as the endgame of broadband access, and explain the inherent coverage and QoS issues of conventional radio-over-fiber networks for distributed wireless MAC protocols and how their limitations can be avoided in so-called radio-and-fiber networks. We explore powerful layer-2 optical-wireless, hierarchical frame aggregation, and network coding techniques that significantly improve the throughput-delay performance, resource utilization efficiency, and survivability of NG-PON and FiWi networks. Finally, we inquire into the opportunities of sensor-enhanced FiWi networks and propose our novel Über-FiWi network, whose potential is demonstrated by studying the beneficial impact of inter-home scheduling of emerging plug-in electric vehicles on the resource management of a more sustainable future smart grid. View full abstract»

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  • Next generation optical-wireless converged network architectures

    Page(s): 22 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (273 KB) |  | HTML iconHTML  

    This article provides a comprehensive analysis on implementing the next-generation optical-wireless integration architectures. The different approaches to implementing a complete fixed-mobile converged network that ensures desired quality of service for various applications are explored. This discussion is specifically focused on LTE-10GEPON integration networks where passive optical networks are used as the backhaul to LTE. Special attention is given to address the issue of providing proper means to enable intercommunication between neighboring base stations, which is one of the crucial considerations in next-generation wireless networks. We propose potential 10GEPON-LTE converged network architectures and comparatively analyze the benefits gained from each of the integration architectures by elaborating on the operational and control structures. Our performance analysis provides insight into QoS-rich next-generation optical-wireless converged networks. View full abstract»

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  • Energy efficiency in the extended-reach fiber-wireless access networks

    Page(s): 28 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (284 KB) |  | HTML iconHTML  

    Telecommunication networks call for novel energy-efficient design and management schemes as a result of the increasing contribution of the ICT sector to electricity consumption and greenhouse gas emissions. Access networks, being one of the significant contributors in the last mile, require power saving protocols and architectures. As one of the emerging access network solutions, convergence of PONs and wireless access networks, also named as FiWi, offer to combine the robustness and high capacity of optical networks with the mobility and ubiquity of wireless networks. In this article, we present an overview and a brief comparison of energy-efficient protocols and design approaches in FiWi networks. We further propose an energy-efficient bandwidth allocation mechanism in FiWi networks that adopts an optical burst switching (OBS)-like report generation mechanism in LREPON. Through simulations, we show that the proposed scheme leads to significant energy savings in the long-reach FiWi network while overcoming the delay penalty of the ONU-BS sleep modes. View full abstract»

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  • Energy-efficient PON with sleep-mode ONU: progress, challenges, and solutions

    Page(s): 36 - 41
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (259 KB) |  | HTML iconHTML  

    Energy usage in our networks is increasing rapidly; and to conserve energy, progress has been made in designing energy-efficient passive optical networks, which are being widely deployed for broadband access. Among the various energy-saving techniques, enabling sleep mode in optical network units is a very promising approach. However, the slow transition of power from active mode to sleep mode in an optical network unit, and the relatively large recovery and synchronization time needed during the wakeup process are challenges that need to be addressed. In this regard, we propose a service-level-agreement-based scheduling scheme for passive optical networks in which the optical line terminal can adjust the sleep time and the optical network unit can quit sleep mode for sending high-priority packets. The trade-off in energy savings vs. delay performance is evaluated using simulations under practical power consumption settings. View full abstract»

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  • Adaptable access system: pursuit of ideal future access system architecture

    Page(s): 42 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (266 KB) |  | HTML iconHTML  

    In this article, we propose a concept of an "adaptable access system" as future access system architecture. First, current issues and trends in communications networks are shown from various points of view, to discuss essential items for a future access system. Next, to set the basic direction of research and development for physical network infrastructure, three visions in the design of future access system architectures are shown. Based on the three visions, three technological targets (key concepts) for realizing the adaptable access system, active single star, servicearea-variable minimum cellular, and access system virtualization, are derived. View full abstract»

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  • Medium access control for the next-generation passive optical networks: the OLIMAC approach

    Page(s): 49 - 56
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (262 KB) |  | HTML iconHTML  

    Next-generation passive optical networks (NG-PONs) promise significant bandwidth increase to end users. Research and standardization efforts are underway to enable enhancements from contemporary PONs to NG-PONs. An area that has not been much investigated from the context of NG-PON2 (as defined by the Full Service Access Networking [FSAN] body) is the medium access control. We showcase for the first time the open problem of MAC implementation beyond WDM PONs, in NG-PON2 with multiple-line-rate channels. We propose a solution called OLIMAC, or the Open Lambda Initiative Medium Access Control, as a mechanism to provision bandwidth and guarantee a services framework in flexible wavelength spaced systems. The article describes the implementation of OLIMAC. The OLIMAC solution is shown to work with different protocols showcasing backward compatibility with existing end-user technologies while facilitating voluminous bandwidth to end users. The OLIMAC concept is simulated, and results show the benefit of the proposal as well as how OLIMAC is instructive in the implementation of NGPON2, especially for multirate flexible wavelength-spacing solutions. View full abstract»

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Aims & Scope

IEEE Network covers topics which include: network protocols and architecture; protocol design and validation; communications software; network control, signaling and management; network implementation (LAN, MAN, WAN); and micro-to-host communications.

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Meet Our Editors

Editor-in-Chief
Xuemin (Sherman) Shen, PhD
Engineering University of Waterloo