Gerenciamento de políticas de qualidade de serviço com suporte à mobilidade

AUTOR(ES)

Thiago Merege Pereira

DATA DE PUBLICAÇÃO

2008

RESUMO

This work provides a means to ensure the quality of service offered to users independently of their location. To manage the user mobility, it is used the Mobile IPv4 (MIP) architecture, and the QoS methodology used is Differentiated Services (diffserv). The diffserv architecture requires the use o multiple devices that need to be configured properly, and one of the techniques that is widely used for this is the Policy-Based Network Management (PBNM) framework. The framework defines the Policy Decision Point (PDP), a logical entity where policy decisions are made, and the Policy Enforcement Point (PEP), a local entity that enforces policy decisions. The PDP access a policy repository where the information is represented in terms of a PIB (Policy Information Base), which is composed by classes and instances of these classes. The diffserv PIB is device-independent and is structured based on the need to configure the sequential diffserv treatments being applied to a packet and the parameterization of these treatments. There are three possible approaches to the PIB provisioning: a complete incarnation is sent to the PEP whenever the configuration of the device changes; multiple incarnations are sent, but only one is active at a time; only the PIB updates (classes and instances) are sent by the PDP. In a mobile environment, the best solution consists in sending only the PIB updates in response to a mobility event. According to this approach, the PIB components are classified into static and dynamic information. The static information is provisioned at the initalization of the PEP, while the dynamic configuration is updated in response to a mobility event. Tests were made to evaluate the impact of the introduction of quality of service on a mobile environment with the use of the PIB update approach. The results showed that the architecture proved to be viable when compared to the latency already introduced by the MIP handover process.

ASSUNTO(S)

ciencia da computacao arquitetura de redes de computadores wireless internet informática - dissertações computer network architectures internet sem fio - controle de qualidade

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