Uma Proposta de Arquitetura de Suporte para a Qualidade de Serviço Orientada para Aplicações de Telemedicina
Creators: name: Pereira, Ana Lúcia Lage
Publisher: name: Zenodo
Year: 2008
Subjects: Redes IP
Telemedicina
Aplicações Multimídia
Qualidade de Serviço
DiffServ
Gerenciamento baseado em Políticas

description: Essa dissertação propõe e avalia uma arquitetura de suporte de Qualidade de Serviço para aplicações de Telemedicina, com suporte ao uso concorrente de Vídeo sob Demanda e Videoconferência sobre uma infraestrutura de rede IP. A arquitetura de Qualidade de Serviço (QoS <em>- Quality of Service</em>) considerada é o <em>DiffServ </em>(<em>Differentiated Services</em>) proposta pelo IETF (<em>Internet Engineering Task Force</em>). Em particular, este estudo propõe a utilização de um elemento gerenciador de políticas de QoS – o <em>Bandwidth Broker </em>– que recebe solicitações de alocação dinâmica de recursos das aplicações de Vídeo sob Demanda e Videoconferência, valida as solicitações contra contratos de níveis de serviço (SLAs <em>-</em> <em>Service Level Agreements</em>) acordados, e aloca recursos através de distribuição de configuração de mecanismos <em>DiffServ </em>em dispositivos de roteamento na rede. Esse trabalho especifica uma solução de integração da rede de vídeo digital a um elemento gerenciador de políticas ao nível de plano de controle – o <em>Bandwidth Broker</em>, de forma a permitir o gerenciamento dinâmico de recursos baseado em políticas. Especifica e prototipa, ainda, uma infraestrutura de suporte para configurações, fazendo uso de plataformas Linux, e valida resultados de implementação de mecanismos de Qualidade de Serviço <em>DiffServ</em>. Para este fim são considerados diferentes cenários que simulam o uso das aplicações do Projeto InfraVIDA – um projeto de telemedicina que integra serviços de Telediagnóstico e Segunda Opinião Médica, baseados na Internet. Uma avaliação das tendências de evolução do campo de gerenciamento de Qualidade de Serviço em redes IP baseado em políticas complementa esse estudo.
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