Simulation-based performance evaluation of queuing mechanisms for AODV routing protocol in MANET

There has been a significant growth in the use of mobile ad hoc network to support network applications. Real time applications are more exposed to delays and as such proper queuing and traffic management at the packet level must be considered to provide the required quality of service to the end user. Queuing mechanisms have been a subject of demanding discussion and research in the network field for scheduling packets from different traffic flows for processing at a network node (Gateway). Various queue scheduling mechanisms have been designed to improve the quality of service for networked multimedia applications. In this paper, we estimate the performance of four queuing mechanisms (FIFO, PQ, DWRR and MDRR) that are widely deployed for differentiated services using a hypothetical network topology. In this paper we carry out simulation using OPNET and compare their relative performance based on AODV routing protocol. The performance metrics used are throughput and queuing delay.