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Fouli K.,Massachusetts Institute of Technology | Maier M.,Optical Zeitgeist Laboratory | Maier M.,INRS - Institute National de la Recherche Scientifique | Medard M.,Massachusetts Institute of Technology
IEEE Communications Magazine | Year: 2011

As the emerging access architecture, NGPONs feature enhanced PON configurations, metro-access integration, and bimodal fiberwireless (FiWi) networks. The moving landscape of NG-PONs provides opportunities for applying novel and promising technologies such as network coding (NC). In this work, we introduce the basic principles of NC and discuss their applicability to NG-PONs, with a focus on layer 2 design. Our example illustrations and simulations demonstrate significant potential performance improvements in various NG-PON scenarios while clarifying some underlying topological constraints of NC. © 2011 IEEE. Source


Maier M.,Optical Zeitgeist Laboratory
IEEE International Conference on High Performance Switching and Routing, HPSR | Year: 2016

Google recently introduced U.S. pilot Project Fi in cooperation with two major 4G LTE network operators. Project Fi intelligently connects mobile users to free open WiFi hotspots or otherwise, if not possible, seamlessly moves them between the two partner LTE networks for delivering the most reliable and fastest available wireless service. Project Fi may be an important step towards meeting the 5G requirements of ultra-high reliability and very low latency while taking economic considerations into account. Following the integrative vision of 5G, this paper attempts to provide further insights into the potential of Project Fi wireless service by elaborating on the integration of 4G LTE-Advanced (LTE-A) heterogeneous networks (HetNets) and low-cost data-centric Ethernet based fiber-wireless (FiWi) broadband access networks with not only WiFi offloading but also cost-saving fiber infrastructure sharing capabilities for small cell backhaul, which is becoming a major performance-limiting factor in mobile networks. Furthermore, given that decentralization is another important aspect of the 5G vision, we develop a decentralized routing algorithm for the resultant FiWi enhanced LTE-A HetNets. © 2015 IEEE. Source


Maier M.,Optical Zeitgeist Laboratory
IEEE International Conference on Communications | Year: 2012

Survivability will play a more prominent role in emerging high-speed, multichannel, long-reach next-generation passive optical networks (NG-PONs) than it did in conventional PONs. In this paper, we report on some of the most promising NG-PON survivability techniques such as dual homing, hitless protection switching by means of equalization delays, interconnection fibers, protection rings, and meshed PON topologies, including their cost-benefit analysis for different population densities. We pay particular attention to the design of advanced inservice monitoring techniques for fault detection and localization in PON distribution fibers and study the merits of combining partial optical protection with wireless protection for realizing reliable fiber-wireless (FiWi) access networks and exploiting them to improve the survivability of other critical networks such as the future smart grid. © 2012 IEEE. Source


Maier M.,INRS - Institute National de la Recherche Scientifique | Maier M.,TU Berlin | Levesque M.,Paradigm | Ivanescu L.,SIAT Bucharest | Ivanescu L.,Optical Zeitgeist Laboratory
IEEE Network | Year: 2012

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 Ãœber-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. © 2012 IEEE. Source


Maier M.,Optical Zeitgeist Laboratory
2013 9th International Conference on the Design of Reliable Communication Networks, DRCN 2013 | Year: 2013

In coming years, broadband access networks are expected to undergo a couple of paradigm shifts. First, copper will play a less important role and eventually give way to bimodal fiber-wireless (FiWi) access networks. Second, broadband access networks will become less an end in itself than a means to an end by exploiting them not only for telecommunications per se but also other relevant economic sectors of the future low carbon society. Despite recent research activities demonstrating that both fiber and wireless media might be also used to transfer small amounts of energy over limited distances, it is anticipated that fiber and wireless technologies represent the two remaining complementary building blocks of future converged communications networks, while copper remains the energy (but not necessarily data) transmission medium of choice in future smart power grids. In this paper, we explore ways of using dependent FiWi access networks to enable or enhance the dependability of other critical infrastructures of today's society, most notably the future smart power grid. After discussing the respective pros and cons of a variety of available access networking technologies, we elaborate on the rationale behind the design choices of our Über-FiWi network and showcase its suitability as a holistic end-to-end smart grid communications infrastructure for next-generation power distribution networks via illustrative experimental and co-simulation studies on emulated power blackouts during a security breach and coordinated plug-in electric vehicle (PEV) charging without a deviated voltage profile and deteriorated power quality. © 2013 Scientific Assoc for infocom. Source

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