Flow level modelling of Internet traffic in Diffserv queuing

While Internet traffic is currently dominated by elastic data transfers, it is anticipated that streaming applications will rapidly develop and contribute a significant amount of traffic in the near future. Therefore, it is essential to understand and capture the relation between stream and elastic traffic behavior. In this paper we focus on developing simple yet effective approximations to capture this relationship. We study, then, an analytical model to evaluate the performance of elastic traffic under Diffserv architecture. This model is based on the fluid flow approximation. We assume that Diffserv architecture gives the head of priority to real time traffic and shares the remaining capacity between the elastic ongoing flows according to a specific weight.