Performance Analysis of a QoS System with WFQ Queuing Using Temporal Petri Nets

The paper presents the results of analysis and modelling of differentiated services using Petri nets. Mechanisms and methods of implementation of QoS (Quality of Service) services in packet networks are discussed. A network model supporting data transfers related to different traffic classes was designed and studied. Traffic shaping mechanisms based on WFQ (Weighted Fair Queuing) system used in QoS were studied. The impact of the traffic shaping mechanism was studied and the performance of the modelled systems was evaluated. The application of simulation tools in the form of TPN (Temporal Petri Nets) was aimed at verifying the traffic shaping mechanisms and evaluating the performance of the studied WFQ system. Our simulation results show that the number of high-priority flows have a critical impact on average waiting times and queue length.