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A Mobile Ad hoc Network (MANET) is made up of multiple nodes connected by routing protocols that do not require any infrastructure or centralized access point. Mobility and transmission power are two important parameters that influence the activity of MANET routing protocols. This study investigates the network performance of the reactive protocol AODV under different transmission power conditions in three mobility models of Random waypoint, Mass mobility and Linear mobility. Also, this study evaluates the impact of network size, mobility speed and simulation area on the network performance in terms of different QoS parameters. The simulation results are obtained using OMNeT++ and INET framework for AODV routing protocol. The findings indicate a good and helpful baseline for the researchers in evaluating some of the QoS metrics such as the packet delivery ratio, end to end delay and throughput under …