Análise de desempenho do protocolo TCP TS-PRIO utilizando modelos Markovianos

Abstract

This work presents the implementation of a model for the TCP-Reno protocol, as well as a detailed technique for modeling the network, with the purpose of measuring the burstiness and the throughput of TCP traffic in a congested shared router. This is necessary to study and to predict the behavior of a data network. The model was validated by comparing its results to simulations carried out with specialized simulation software, namely the Network Simulator (NS-2). After presenting the model and the main goals of this work, a detailed analysis of a modi- fied protocol that implements QoS (Quality of Service) in the transport layer was done. This protocol called TCP TS-Prio, implements a differentiation in the size of the sliding window, thus giving priorities to certain flows. This analysis is needed to reveal qualities and limitations of this protocol in several network environments (scenarios), because in the original work on TCP TS-Prio the author focused mainly on the dynamic behavior of the Protocol. We then conclude that TCP TS-Prio is able to offer service differentiation, but this depends directly on the network congestion degree.