Comparative evaluation of QoS routing in VANET

Vehicular Ad hoc Networks (VANETs) have gained great interest among network researchers in the past few years. One of the major areas of great interest in VANET research is routing, and particularly, quality of service routing. The challenge is finding ways to counter the high speed nature of VANETs and the constantly changing topologies, and then determining which routing protocols are best suited for a particular transmission type; and which ones provide more consistent and stable routing performances. Great efforts have and are still being made to improve the routing capabilities of the protocols in existence, continued upgrades and reevaluations to QoS mechanisms in routing protocols are an integral practice in the field of VANETs. This paper presents a comparative QoS evaluation of two routing protocols, AODV and DSR. We carried out our research by means of simulation performed using the NS2 simulation tool, and implemented realistic traffic environment models using the VanetmobiSim tool. We compared the two protocol's QoS routing performances based on the throughput and end-to-end delay metrics and a set of defined parameters. In various scenarios, either protocol out performs the other; however, an aggregated evaluation does give DSR the upper hand. We concluded that overall, DSR was the preferable protocol as it showed more stable and consistent results than AODV.

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