Anlatıcı ve Bakış Açısının Üslûba Yansımaları

De modo a contribuir na maximização de admissões mantendo os níveis de qualidade em redes sem fio em larga escala, esta Dissertação de Mestrado propôs o sistema SDWiNeMO, uma arquitetura definida por software que possibilita aos MOs, com diferentes padrões de mo- bilidade e capacidades, executar sessões móveis com garantias de QoS de forma ininterrupta e ubíqua enquanto se movem.

O sistema SDWiNeMO faz uso de inovadoras funcionalidades orientadas à qualidade, im- plantadas em níveis granulares, capazes de fornecer garantias de QoS as comunicações móveis. Para tal, SDWiNeMO foi concebido sob a premissa do controle de admissão orientado à quali- dade, fornecendo garantias de QoS aos fluxos de sessões das aplicações móveis, além de fazer uso de inovadoras técnicas de controle dos procedimentos de mobilidade, permitindo executá- las de forma transparente e eficaz.

Desta maneira, o sistema SDWiNeMO teve como principais contribuições:

• Mecanismo de gerência de mobilidade infraestruturado, baseado no paradigma de Re- des Definidas por Software, que faz uso do protocolo OpenFlow e do IEEE 802.21 para aplicação de políticas de controle da rede e de execução de handover, respectivamente, capaz de trabalhar com a antecipação e controle da mobilidade de forma transparente e orientada à qualidade.

• Novo método de seleção de ponto de acesso sem fio, capaz de tomar decisões orientadas à qualidade que melhor atendam aos requisitos de QoS das aplicações.

• Novo método de balanceamento de carga por mobilidade, permitindo maximizar as ad- missões em casos de exaustão de recursos.

As avaliações conduzidas por meio de simuladores e emuladores possibilitaram validar os mecanismos propostos sob condições que se aproximam das enfrentadas em ambientes reais. Os

resultados das avaliações comprovaram a eficácia dos mecanismos no plano de controle, através da maximização de admissões fazendo uso do controle de admissão orientado à qualidade, e no plano de dados, por meio de uma avaliação que considerou a qualidade do conteúdo transmitido pela rede, sob a perspectiva do usuário.

Neste trabalho constatou-se o potencial do uso do paradigma de Redes Definidas por Soft- ware para o controle granular dos mecanismos de gerência de mobilidade. Sob esta perspeciva, o sistema SDWiNeMO representa um avanço para este segmento, uma vez que proporcionou incorporar novas funcionalidades aos mecanismos já existentes, além de propor novas técnicas que superam as típicas abordagens de gerenciamento de mobilidade.

Diante da popularização dos sistemas de comunicações móveis e da crescente proliferação de MOs, algumas funcionalidades devem ser incorporadas ao sistema SDWiNeMO, com o ob- jetivo de aumentar sua capacidade de atuação. Desta forma, alguns apontamentos de trabalhos futuros são sugeridos:

• Integrar estratégias de monitoramento de qualidade da rede, sob a perspectiva dos requisi- tos de qualidade das aplicações, para avançar o mecanismo de antecipação de mobilidade, de forma que este também seja disparado em casos de mudanças das condições da rede.

• Avaliar o sistema SDWiNeMO em um ambiente real, fazendo uso de um controlador SDN, PoAs e diferentes MOs em hardware real.

• Estender as técnicas de controle de admissão de sessões móveis e balanceamento de carga por mobilidade para outros tipos de redes móveis (e.g LTE, 5G, etc).

À frente do exposto neste trabalho, espera-se que a evolução do sistema SDWiNeMO possa dar suporte aos modernos sistemas de comunicações móveis, bem como à crescente exigência dos usuários.

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