Projeto e implementação de uma nova técnica para estimativa de capacidade da rede IP de acesso em um sistema de telefonia celular

摘要

The actual scene on comunication networks, where convergent networks plays a fundamental role, points to the needing of quality of service guarantee for given services. Such quality is indispensable for the new telecom operator’s business model. The passive and active methods have shown determinative role on this task, quantifying and qualifying data related to netkwork state. Tied to active measurement, packet pair dispertion technique apears as a reliable and promising method for path capacity measurement between two points. Conforming the specifications from Plataforma e Servi¸cos de Telemetria - CelTel project, idealized by Grupo de Pesquisas Avan¸cadas em Redes de Computadores e Tecnologia da Informa¸c˜ao (GPARC&TI), the present dissertation proposes an implementation of the packet pair dispersion technique focused on tipical cellular topologies. Such topologies caracterizes for it’s low transmission rate on access networks, allowing capacity measurements of a path to be guided by a lower bound value based on access’ link capacity. This work presents a bibliographical revision about the aspects related to network management, focusing on existing active measurement techniques. Later, the packet pair technique is shown on the project context, as well as its implementation and achieved results and discutions.