Evaluation study of QoS-enabled AODV

Due to the dynamic nature of mobile ad-hoc networks (MANETs), there are many issues which need to be tackled. One of the areas for improvement is quality of service (QoS) routing. Various approaches and enhancements have been proposed including QoS-AODV. It is proposed to enhance one of the existing routing protocols for MANET namely AODV (ad-hoc on-demand distance vector). In QoS-AODV the original AODV is extended by adding necessary new fields including maximum delay extension and minimum bandwidth extension. Our work highlights the combination of both metrics: delay and bandwidth respectively. The main aim of this paper is to conduct evaluation study on QoS-AODV along with our proposed approach. NS-2 simulator is used in performing the simulation study in order to test its effectiveness. Various scenarios with different mobility parameters are taken into account in the simulations. Average latency, packet delivery ratio (PDR) and normalized overhead load are the selected evaluation metrics. Our experiments study the effect of number of mobile nodes, maximum node speed and traffic load as well as the impact of connectivity maintenance methods employed namely: HELLO messages and MAC layer feedback.