Performance Evaluation of AODV Routing Protocol in VANETs Considering Multi-flows Traffic

In this paper, we investigate the performance of AODV routing protocol in a Manhattan grid scenario when sending triple flow. We considered two different scenarios with three TCP flows (TCP1xTCP2xTCP3) and one UDP flow and two TCP flows (UDPxTCP1xTCP2) and data rates of 0.1 Mbps and 1 Mbps. For the simulations, we used SUMO to generate the vehicle movement and NS3 to analyze the network performance. We considered IEEE 802.11p standard and TwoRayGroundPropagationLossModel. We evaluate the network performance considering throughput and cwnd metrics. The simulation results show that TCP flows during the beginning phases of transmission performs good because of the slow-start mechanism. For TCP1xTCP2xTCP3 scenario and small data rates, there are some oshillations, but all TCP flows send data to destination almost all the simulation time. For UDPxTCP1xTCP2 scenario and small data rates, TCP flows after detecting congestion they send only few packets and UDP have priority. For UDPxTCP1xTCP2 scenario and big data rates, TCP and UDP have competing data flows going over the same intermediate nodes and UDP is more aggressive than TCP.