Analysis of Traffic Impact on Proposed Congestion Control Scheme in AODV

Congestion is a noteworthy problem in Mobile Ad hoc Network, which occurs when number of users increases and a node carries data more than its capacity. In this paper, a congestion control mechanism is suggested for the performance improvement of basic routing protocol AODV. The congestion status of a node is valuated based on parameters node queue length, channel utilization and residual node energy using fuzzy logic control. To strengthen the congestion control, an adaptive network coding mechanism is employed in case of high congestion to minimize transmissions amongst nodes. Recovery of data flow with neighbouring non-congested node is performed in case of medium congestion to avoid condition of high congestion and to reduce recovery time. Modifications are made to the AODV protocol in order to develop congestion control scheme without any additional overhead. The proposed methods are tested for different terrain areas with change in number of nodes and traffic load. The two variants of proposed protocol are simulated on Network simulator and impact of traffic on proposed schemes is investigated. The results are compared with basic AODV protocol. From simulation results, it is evident that adaptive network coding and congested link repairing method has improved scalability performance of routing protocol.