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@MastersThesis{Candia:2014:HeAlEs,
               author = "Candia, Marcos Paulo Lobo de",
                title = "Heur{\'{\i}}stica para aloca{\c{c}}{\~a}o de espectro em redes 
                         {\'o}pticas el{\'a}sticas baseada em medidas de 
                         fragmenta{\c{c}}{\~a}o",
               school = "Instituto Nacional de Pesquisas Espaciais (INPE)",
                 year = "2014",
              address = "S{\~a}o Jos{\'e} dos Campos",
                month = "2014-02-24",
             keywords = "redes {\'o}pticas el{\'a}sticas, aloca{\c{c}}{\~a}o de 
                         espectro, processo markoviano, fragmenta{\c{c}}{\~a}o, elastic 
                         optical networks, spectrum allocation, markov process, 
                         fragmentation.",
             abstract = "A tecnologia da fibra {\'o}ptica vem sendo utilizada para atender 
                         a crescente demanda de tr{\'a}fego de dados em redes 
                         computacionais. As redes {\'o}pticas el{\'a}sticas, recentemente 
                         propostas, oferecem capacidade de aloca{\c{c}}{\~a}o 
                         din{\^a}mica de espectro {\'o}ptico para acomoda{\c{c}}{\~a}o 
                         de requisi{\c{c}}{\~o}es de conex{\~a}o com diferentes taxas de 
                         transmiss{\~a}o. Nestas redes, o problema de determinar a rota e 
                         aloca{\c{c}}{\~a}o de recurso espectral para a 
                         constru{\c{c}}{\~a}o dos caminhos {\'o}pticos entre pares 
                         origem-destino {\'e} denominado \emph{Routing and Spectrum 
                         Allocation} (RSA). Tal problema {\'e} comumente dividido em dois 
                         subproblemas: roteamento e aloca{\c{c}}{\~a}o de espectro. Na 
                         aloca{\c{c}}{\~a}o de espectro, cada conex{\~a}o {\'e} 
                         atribu{\'{\i}}da a um ou mais \emph{slots} de frequ{\^e}ncia, 
                         de acordo com sua demanda de transmiss{\~a}o, e, para evitar 
                         interfer{\^e}ncia entre transmiss{\~o}es simult{\^a}neas em um 
                         mesmo link da rede utilizam-se bandas de guarda. A din{\^a}mica 
                         de aloca{\c{c}}{\~a}o e libera{\c{c}}{\~a}o de espectro 
                         provoca a fragmenta{\c{c}}{\~a}o deste recurso, problema que 
                         pode influenciar diretamente a efici{\^e}ncia das redes. Neste 
                         trabalho, estuda-se o subproblema de aloca{\c{c}}{\~a}o de 
                         espectro em um link de uma rede {\'o}ptica el{\'a}stica sob 
                         tr{\'a}fego din{\^a}mico por meio um modelo markoviano a tempo 
                         cont{\'{\i}}nuo. Uma heur{\'{\i}}stica para 
                         acomoda{\c{c}}{\~a}o das requisi{\c{c}}{\~o}es de 
                         conex{\~a}o, que tem por objetivo minimizar a 
                         fragmenta{\c{c}}{\~a}o de espectro, {\'e} proposta e comparada 
                         a outras da literatura atrav{\'e}s de alguns exemplos 
                         num{\'e}ricos. ABSTRACT: Optical fiber technology has been used 
                         to supply the growing demand for data traffic in computer 
                         networks. Elastic Optical Networks, recently proposed, provide 
                         capacity for dynamic spectrum allocation to accommodate connection 
                         requests with different transmissions rates. In these networks, 
                         the problem of determining the route and the allocation of 
                         spectrum resource for the construction of optical paths between 
                         the source-destination pairs is called Routing and Spectrum 
                         Allocation (RSA). This problem is commonly divided into two sub 
                         problems: routing and spectrum allocation. In the spectrum 
                         allocation, each connection is assigned to one or more slots of 
                         frequency, according to its transmission demand, and, to avoid 
                         interference between simultaneous transmissions on the same link 
                         guard bands are used. The dynamic allocation and release of 
                         spectrum causes the fragmentation of this resource may influence 
                         the efficiency of the networks directly. In this work, the sub 
                         problem of spectrum allocation on a link in a Elastic Optical 
                         Network under dynamic traffic is studied through a continuous-time 
                         Markov model. A heuristic to accommodate connection requests, 
                         which aims to minimize the spectrum fragmentation, is proposed and 
                         compared to others from the literature through some numerical 
                         examples.",
            committee = "Guerra, Eduardo Martins (presidente) and Rodrigues, Rita de 
                         C{\'a}ssia Meneses (orientadora) and Carvalho, Solon 
                         Ven{\^a}ncio de (orientador) and Yanasse, Horacio Hideki and 
                         Yoneyama, Takashi",
         englishtitle = "Heuristic for the spectrum allocation in elastic optical networks 
                         based in fragmentation measures",
             language = "pt",
                pages = "98",
                  ibi = "8JMKD3MGP7W/3FMFJ4S",
                  url = "http://urlib.net/rep/8JMKD3MGP7W/3FMFJ4S",
           targetfile = "publicacao.pdf",
        urlaccessdate = "24 jan. 2021"
}


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