Abstract
Traditional approaches to wavelength routing network design divide it into two separate problems: virtual topology design (VTD), in which best connections among nodes are derived from traffic demand: and routing-andwavelength assignment (RWA), in which physical paths are accommodated in the physical topology to support the requested connections. We propose an iterative linear programming approach to solve both problems jointly under multiple objectives such as congestion avoidance, fiber load and wavelength pool minimization. The solution of the VTD problem generates a request for a set of paths to be supplied by the physical topology. Physical paths are then allocated in order to minimize some objective function that is akin to a linear programming formulation.
Highlights
Abstract· Traditional approaches to wavelength routing net work design divide it into two separate problems: virtual topology design (VTD), in which best connections among nodes are derived from traffic demand; and routing-and wavelength assignment (RWA), in which physical paths are accommodated in the physical topology to support the re quested connections
Paradoxalmente, desde a invenc;ao do computador ate os anos 80, as velocidades de processamento vieram aumen tando bern mais rapidamente do que as velocidades de trans missao
Como nao ha conversao de comprimento de onda, esse mesmo valor sera alocado para todos os links fisicos por qual 0 correspondente caminho optico i - j passa
Summary
Infra-estrutura de telecomunicac;oes ern todo 0 mundo. Ca pacidades de transmissao cada vez mais elevadas (ate 40 Gbps em cada canal) tern possibilitado a implantac;ao de redes de comunicac;6es que viabilizam a integrac;ao de diferentes tipos de trMego, a sofisticac;ao dos servic;os e a interconexao de redes remotas [1]. Na primeira metade da decada de 90, a busca destas ar quiteturas se concentrou nos protocolos de acesso ao meio de transmissao (MAC), ja que os recursos tecnol6gicos dispon(veis s6 permitiam a construc;ao de topologias ffsicas do tipo broadcast, gerando as chamadas redes broadcast and-select. Varios produtos estao sendo lanc;ados por grandes cons6rcios industriais, bern como as tecnicas de gerenciamento e protec;ao adequadas para 0 tipo de trMego a ser atendido. Esta minimiza
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