Capítulo 5 Conclusão e Trabalhos Futuros
5.2 Trabalhos Futuros
Nesta seção, apresentamos um conjunto de tópicos que poderiam ser propostos como extensões para a tese.
• Reserva de Recursos: Nesta tese, tratamos especificamente com reserva de recursos do ponto de vista da aplicação. O mapeamento destes requisitos de alto nível em características específicas do meio sem fio deve ser investigado. Uma questão importante é quanto de alocação de recursos (largura de banda) de baixo nível seria necessário para satisfazer os requisitos de recursos no nível de aplicação.
• Escalonamento de pacotes: Nesta tese, focamos nos aspectos de QoS para o nível de chamada, isto é, bloqueio de chamadas e descarte de handoffs. Contudo, após a admissão do usuário é necessário que o controle seja efetuado por pacotes, para assegurar que os requisitos dos fluxos sejam satisfeitos, resolvendo problemas de contenção e permitindo o compartilhamento justo do enlace. Trabalhos nesta área propõem esquemas para compensar as características do meio, como os erros de dependente de localização [123][124].
• Avaliação do acoplamento entre gerenciamento de QoS e handoff: Nesta tese, abstraímos a possibilidade de cenários que permitissem a avaliação dos efeitos do acoplamento do gerenciamento de QoS, em particular, o controle de admissão, com o gerenciamento de mobilidade. Um estudo interessante seria a avaliação dos benefícios da integração dos procedimentos de gerenciamento de QoS e propostas de
handoffs transparentes na redução do atraso da sinalização associada a estes
procedimentos em ambientes com múltiplos roteadores de acesso e domínios administrativos.
• Proposta de uma arquitetura fim-a-fim: Uma arquitetura baseada em soluções escaláveis para a provisão de QoS, poderia ser definida. Nesta tese, introduzimos alguns elementos importantes, como controle de admissão e reserva de recursos por agregado e uma estrutura hierárquica de servidores. Entretanto, para prover QoS fim- a-fim, ainda seria necessária a categorização do tratamento recebido por pacotes pertencentes a usuários móveis, por exemplo, seguindo a filosofia DiffServ, a criação de PHBs específicos para pacotes de aplicações que atravessem domínios compostos de redes fixas e redes móveis sem fio. Nesta tese, focamos no gerenciamento dos enlaces sem fio, que compreendem o gargalo do sistema, entretanto, a reserva de recursos no backbone da rede fixa do domínio (rede de acesso) também deve ser verificada para uma proposta fim-a-fim consistente. Além disso, são necessárias interfaces bem definidas entre os elementos que gerenciam e efetuam a provisão de QoS em cada domínio, por exemplo, entre o SQD proposto nesta tese e outros esquemas que usam a idéia de bandwidth brokers.
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