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REPUBLIC OF SERBIA MINISTRY OF DEFENCE
MINISTRY OF DEFENCE Material Resources Sector Defensive Technologies Department
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DIFFERENT TYPEs OF WFQ MECHANISMS IN VOIP TRAFFIC ANALYSIS
Military Academy, University of Defence, Belgrade, vladimir.susha@gmail.com boban Z. pavlović Military Academy, University of Defence, Belgrade, bobanpav@yahoo.com radovan dragović Military Academy, University of Defence, Belgrade, dragovicradovannn@gmail.com
Abstract: In order to provide a desirable end-to-end QoS in the IP telecommunication networks, it is necessary to manage an appropriate QoS mechanism for achieving the optimal values of QoS parameters. This primarily refers to QoS parameters which are monitored in real-time applications, such as packet delay, packet delay variation (jitter) and packet loss. In our approach we analyze the Weighted Fair Queuing (WFQ) mechanism. We apply the simulation scenario based on a given telecommunication network through the OPNET Network Simulator. The simulation model contains a network node with defined applications (Background and VoIP applications) and profiles (Background and VoIP profiles) which are implemented to end users and appropriate network elements (routers). In this paper we analyzed different WFQ implementations. We defined five simulation scenarios in total, with four different solutions for Quality of Service configuration. The initial scenario comprises a model without a QoS mechanism. The other four scenarios have different WFQ implementations according to ToS (Type of Service), transport protocol (TCP or UDP), port value (for different applications) and finally according to the values of DSCP field in the IP header. By comparing the obtained QoS parameter values for all simulation scenarios, the optimal solution for choosing an appropriate WFQ implementation is given in conclusion.
Keywords: Weighted Fair Queuing, Quality of Service, Riverbed Modeler, Voice over IP.
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