2,218 research outputs found

    AMazING - Advanced Mobile wireless playGrouND

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    We describe a wireless testbed composed of 24 wireless nodes that can be used to perform a broad range of studies in the area of next generation networks. This paper addresses the difficulties and constrains faced by the authors throughout the deployment process of such testbed. Flexibility and controllability were key concerns driving the testbed design. The testbed can be remotely managed through a series of remotely accessible web services performing low level management. Validation results are presented, showing the interference levels of the testbed as well as its maximum throughput capabilities

    Plataforma de medida com suporte para mobilidade

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    O Instituto Telecomunicações possui uma iniciativa denominada AMazING (Advanced Mobile wIreless Network playGround). Esta consiste numa test-bed, ou seja, uma rede de testes sem fios, constituída por 24 nós fixos espalhados pelo terraço do departamento, que permite a recriação de cenários reais e emulados. Posteriormente, foi adicionado no terraço um circuito metálico, que é percorrido por um veículo que tem embutido um motor elétrico sem escovas, que irá ter como função de nó móvel, promovendo assim o conceito de mobilidade a esta rede de testes. Este documento foca-se principalmente no controlo de velocidade, como também na localização do veículo no circuito em tempo real.The Institute of Telecomunications has a project known as AMazING (Advanced Mobile wIreless Network playGround) this is basicaly a testbed platform. In other words, is a wireless network for testing, based on 24 fix nodes spread over the rooftop of the department that allows to replicate and emulate real enviroments. Afterwards, a metallic circuit was implemented into the network to suport a electric vehicle with brushless motor DC that was a function to be a mobile node that brings to this network the concept of mobility. This document will focus only on the speed control of the electric motor as well as the location of the vehicle in real time.Mestrado em Engenharia Eletrónica e Telecomunicaçõe

    Demonstrating the AMazING panel

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    Experimental testbeds for evaluating solutions in computer net- works, are today required as a complement to simulation and emu- lation. As these testbeds become larger, and accessible to a broader universe of the research community, dedicated management tools become mandatory. These tools ease the complex management of the testbed specific resources, while providing an environment for researchers to define their experiments with large flexibility. While there are currently several management tools, the research commu- nity is still lacking tools that smooth the experimentation workflow. These were key aspects that we considered when developing the management infrastructure for our wireless testbed[4] (AMazING). We developed a experimentation support framework supported by an attractive GUI, automation and scripting capabilities, as well as experiment versioning and integrated result gathering and analysis

    Integração de funções de rede virtualizadas e funções de rede físicas

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    Network Functions Virtualization (NFV) and Software Defined Networking (SDN) have been in the center of network evolution, promising a more flexible and efficient way of managing networks through the on-demand instantiation of network functions (NFs) and reconfigurability of the network as necessary. Nevertheless, as new mechanisms are developed, such technologies require testing before their adoption into real-world deployments. This is where this dissertation contributes, by proposing and evaluating a system architecture that integrates a physical wireless testbed with a cloud-based environment. This allows physical wireless nodes to become part of the cloud environment, enabling its use and configuration as virtual NFs (VNFs). Results showcased the system feasibility, with the testbed being able to instantiate on-demand virtual and physical NFs, in the physical wireless nodes and in an OpenStack data-center.A Virtualização de Funções de Rede e as Redes Definidas por Software têm estado no centro da evolução das redes, prometendo uma forma mais flexível e eficiente de as gerenciar através da instanciação on-demand de Funções de Rede e da sua reconfiguração conforme o necessário. No entanto, à medida que novos mecanismos são desenvolvidos, é também necessário a realização de testes sobre estas tecnologias antes destas serem adotadas em implementações em contexto real. É aqui que esta dissertação contribui, propondo e avaliando uma arquitetura de sistema que integra um testbed físico sem fios, com um ambiente baseado em nuvem. Isto permite que os nós sem fios físicos se tornem parte do ambiente de nuvem, permitindo o seu uso e configuração como Funções de Rede Virtuais. Os resultados demonstraram a viabilidade do sistema, dada a capacidade da testbed em instanciar Funções de Rede virtuais e físicas quando requisitadas tanto nos nós sem fios físicos quanto no servidor OpenStack.Mestrado em Engenharia Eletrónica e Telecomunicaçõe

    Experimentation made easy with the AMazING panel

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    Experimental testbeds for evaluating solutions in computer networks, are today required as a complement to simulation and emulation. As these testbeds become larger, and accessible to a broader universe of the research community, dedicated management tools become mandatory. These tools ease the complex management of the testbed specific resources, while providing an environment for researchers to define their experiments with large flexibility. While there are currently several management tools, the research community is still lacking tools that smooth the experimentation workflow. These were key aspects that we considered when developing the management infrastructure for our wireless testbed[4] (AMazING). We developed a experimentation support framework supported by an attractive GUI, automation and scripting capabilities, as well as experiment versioning and integrated result gathering and analysis

    Sistema para gestão remota de redes experimentais

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    Mestrado em Engenharia de Computadores e TelemáticaA Internet e as redes no seu geral estão cada vez mais presentes no nosso quotidiano. No entanto, o seu crescente uso destaca também algumas das suas limitações, levando os investigadores de redes a criarem novas soluções, numa tentativa de preverem e resolverem problemas que daí possam advir. O desenvolvimento destas soluções implica que sejam realizados testes exaustivos antes que estas se tornem aptas para o uso das massas. Podem ser adoptadas diversas abordagens para a realização destes testes. Simulações são importantes como uma primeira aproximação, contudo, não conseguem captar a dinâmica e a imprevisibilidade de um ambiente real. A emulação surge como alternativa, tentando colmatar essa falha, no entanto, não é eficaz na reprodução de cenários mais complexos. A solução poderá passar pela criação de infra-estruturas dedicadas ao teste destas soluções, denominadas de redes experimentais, permitindo realizar uma avaliação mais profunda e fiável das mesmas. Contudo a sua construção envolve grandes custos e as infra-estruturas caem em desuso assim que é alcançado o produto final. É necessário desenvolver maneiras de instrumentalizar estas infra-estruturas, de forma a optimizar estes recursos para futuros testes. Esta dissertação centra-se nos problema evidenciados na criação destas redes de teste, estudando as existentes formas de gestão destas redes experimentais, bem como o seu uso optimizado com vista à criação de experiencias. Pretende-se assim desenvolver no âmbito desta tese, uma ferramenta que permita aos utilizadores criarem e usarem facilmente e de forma eficiente uma rede experimental.The Internet, as with networks in general, is increasingly present in our everyday lives. However, its use also highlights some of their limitations, leading researchers to create new network solutions in an attempt to anticipate and solve problems that may arise. These solutions require exhaustive tests before they become eligible for production. Several approaches can be taken to conduct such tests. Simulations are important as first approximations; however, they fail to capture the dynamics and unpredictability of a real environment. Emulations present an alternative, but fail to reproduce more complex scenarios. Experimentation facilities must therefore be deployed, to achieve a higher level of realism. These facilities, also referred as testbeds, involve high-complexity deployment and operation, falling into disuse once they arrive at a final product. Methods of managing these infrastructures must be developed in order to avoid this waste of resources for future tests. This dissertation focuses on the problems inherent to the management of these facilities, with a focus on their users. Different approaches in network testing must be studied and the different methodologies on experimentation must be collected. An application is developed to address this problem, enabling users to create their experiments and collect results in both an organized and effective manner

    Interactive Food and Beverage Marketing: Targeting Children and Youth in the Digital Age

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    Looks at the practices of food and beverage industry marketers in reaching youth via digital videos, cell phones, interactive games and social networking sites. Recommends imposing governmental regulations on marketing to children and adolescents

    Leading in Service Innovation: Three perspectives on service value delivery in a European context

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    This paper explores the relationships between the shaping of “service value propositions” according to three dimensions: “intangible mix”, “physical support”, and “time”, and the strengthening of Innovative Capability in service organizations. After the first introductory section, we describe a series of related innovative moves experienced in the European context by leading companies. We analyze how JCDecaux addresses service recipients simultaneously as citizens and consumers, focusing especially on the Cyclocity project. With CS2 Lawyers in the UK, we envision how automation and technology adoption in professional services may lead to significant productivity improvement for the good of society. Finally, we study how SNCF in France has succeeded in implementing a permanently strengthening value proposition in public service through the recent launching of the IDTGV initiative. In these situations, the service companies have clearly addressed their market considering three different forms of interrelated, yet distinct, targets: “ultimate beneficiaries”, “paying bodies”, and entities or individuals who somehow “prescribe” the consumption of services. In these three situations, we investigate the robustness of the “value propositions” thus implemented, and analyze the particular role played by technology in the success of the new ventures.Service and innovation; value proposition; technology implementation
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