Avaliação de modelos de mobilidade em redes ad hoc sem fio.

Abstract

One of the most important components in a simulation of a mobile ad hoc networks is the mobility model. Recent researches show that this component significantly influences the performance of protocols. Mobility metrics are used in order to compare the various mobility models proposed. However, there is no consensus on the ability the metrics have to differentiate models that belongs to different categories. Furthermore, although some models of mobility have a lot of input parameters, most studies examine a small set of parameters. To solve these problems, it was specified and used a formal methodology for evaluating mobility models in mobile ad hoc networks. The methodology provides a comprehensive classification of the mobility parameters and proposes a way to ensure speed equivalence among the evaluated models. To validate the methodology was performed a case study, which used six models and seven mobility metrics. It was found that the use of the methodology enabled to: (1) check the capacity of metrics to differentiate the models; (2) estimate the impact of mobility models´ parameters on mobility metrics; and (3) analyze the relationship of dependency between the metrics. Thus, the use of the methodology provided a more significant evaluation of mobility models and metrics.