Testing cooperative communication schemes in a virtual distributed testbed of wireless networks

It is expected that Next Generation Networks (NGNs) will offer seamless interoperability among heterogeneous access technologies in order to provide ubiquitous access. In such settings, short range technologies may be used in order to extend the coverage area of cellular systems while cooperative diversity can improve the efficiency of the wireless systems. An advanced, backward compatible, with the 802.11 standard, MAC protocol for cooperative ARQ scenarios in NGNs sets the research framework for this work. The functionalities of the RCSMA protocol 1 will be enhanced and the derived analytical models will be validated at the UNITE Virtual Distributed Testbed (VDT) (2).Peer ReviewedPostprint (published version

A Web-based Database System for Providing Technical Information on ATM Networking Platforms

This paper presents a Web-based database hosting technical information about pioneering ATM networking platforms, associated research activities engaging these platforms, and related important trials conducted in the framework of these research activities. The paper outlines the organisation and structure of the information content in the database and discusses methods of access through the WWW interface. Besides the “static” information offered by the database, other Java-based tools provide for the on-line monitoring of the status of the ATM platforms and for manipulating data arising from technological trials on these platforms. The integration of these tools with the database, under a common WWW interface is discussed

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www.elsevier.com/locate/comnet Service invocation admission control algorithm for multi-domain IP environment

GREENET - An Early Stage Training Network in Enabling Technologies for Green Radio

International audienceIn this paper, we describe GREENET (an early stage training network in enabling technologies for green radio), which is a new project recently funded by the European Commission under the auspices of the 2010 Marie Curie People Programme. Through the recruitment and personalized training of 17 Early Stage Researchers (ESRs), in GREENET we are committed to the development of new disruptive technologies to address all aspects of energy efficiency in wireless networks, from the user devices to the core network infrastructure, along with the ways the devices and equipment interact with one another. Novel techniques at the physical, link, and network layers to reduce the energy consumption and carbon footprint of 4G devices will be investigated, such as Spatial Modulation (SM) for Multiple-Input-Multiple-Output (MIMO) systems, Cooperative Automatic Repeat reQuest (C-ARQ) protocols, and Network Coding (NC) for lossy networks. Furthermore, cooperation and cognition paradigms will be exploited as additional assets to improve the energy efficiency of wireless networks with the challenging but indispensable constraint of optimizing the system capacity without degrading the user's Quality-of-Service (QoS)

Process Integration of CO2 Methanation for Synthetic Natural Gas Production

In line with the vision of sustainable energy solutions and driven by a commitment to decarbonizing Shell’s energy products, the company is actively exploring the production of Synthetic Natural Gas (SNG) using eco-friendly methodologies. This initiative aligns with global ambitions to mitigate carbon footprints and resonate with the evolving EU regulatory environment.The study stresses two pivotal research areas:Renewable SNG Production: Focused on innovating low-carbon technologies, this segment delves into producing SNG through the integration of renewable CO₂ and green H₂ sources. The exploratory phase spans the complete production chain, right from harnessing renewable CO₂ from biomass-driven sources to the methanation process.SNG Liquefaction Challenges: A deeper probe into integrating the methanation process with SNG liquefaction, this segment emphasizes understanding the intricacies of introducing non-traditional components, notably H₂ and CO, into the liquefaction process. By employing sophisticated simulation tools, we've studied the potential implications on equipment and process efficiencies when integrating these new components.This study, enriched with a broad economic review, identifies optimal methodologies keeping in view economic feasibility, efficiency, and operational considerations. Through these research endeavors, Shell supports its commitment to pioneering sustainable energy solutions and provides a roadmap for future initiatives in the realm of SNG production