Probabilistic QOS Aware Congestion Control in a wireless multimedia sensor network in NS2

The general problem faced in the field of Wireless Multimedia Sensor Networks (WMSNs) is con- gestion. The most common method in the area of WMSNs to minimize congestion is traffic control. Quality Of Service (QOS) is widely used in WMSNs to guarantee preferential service for critical ap- plications by controlling end-to-end delay, reducing data loss and by providing adequate band- width. The present work is on Probabilistic QOS Aware Congestion Control (PQACC) which em- ploys probabilistic method based congestion prediction and priority based data transmission rate adjustment, where inelastic real-time traffic and elastic non-real-time traffic are treated sepa- rately. Using the present PQACC approach, average throughput, average source-to-sink delay and average packet loss probability are improved by 9%, 10.33% and 16.03% compared to EWPBRC and achieved 5.97%, 7.05% and 11.69% improvement compared to FEWPBRC. Simulation result reveals that, congestion is effectively predicted, controlled and provides necessary level of QOS in terms of delay, throughput and packet loss, hence making this approach possible in mission criti- cal applications.