Analysis of a traffic classification scheme for QoS provisioning over MANETs

Abstract

Differentiated services (DiffServ) is a networking framework. It classifies traffic using differentiated service code point (DSCP) field in packet header at network layer. Each traffic class is mapped with some priority queue that differs from other priority queues in terms of provided throughput and delay. In this paper, we modify the existing DiffServ model in Qualnet simulator so that it suits the dynamic nature of MANETs. We analyze the enhanced DiffServ architecture by configuring each node in such a way that it works as ingress as well as core node. The effectiveness of the traffic classification scheme in terms of network scalability and data rate is analyzed and compared against the best effort traffic method over MANETs for video, audio and plain data. Simulation results obtained for Diffserv enabled networks are compared with Diffserv disabled ones, evaluation metrics being delay and packet delivery ratio. Simulation result shows a reasonable improvement in all QoS metrics, if DiffSersv is enabled in network. © 2011 Springer-Verlag.