Performance Enhancement in Congested Sensor Network using CAR and MCAR Protocol

Abstract: Network congestion occurs when a link or node is carrying so much data that its quality of service deteriorates. The effects of network congestion are queuing delay, packet loss or the blocking of new connections. In order to recover packet loss some protocols retransmits packets, resulting in a stable congestive condition known as congestive collapse. The sensor is used to collect information and send it to destination. The protocol used to find all available paths in network are AODV, DSR, DVR.The CAR protocol which priorities the low and high priority data for reducing network traffic and efficient use of data-canter. According to priority, it will only forward high priority (HP) data and low priority (LP) data is routed out of the conzone. Working of a CAR protocol is partitioned into three parts which are: network formation, conzone discovery, and differentiated routing. MCAR is primarily a MAC-layer mechanism. It is used in conjunction with high priority data which is highly mobile. The sensors which are not fixed to particular area and continuously moving in such cases MCAR protocol is worth using because CAR does not deal with the sensors which are highly mobile in nature. A lightweight dynamic differentiated routing mechanism to accommodate mobile data sources used in MCAR.

Keywords: Wireless sensor networks, congestion, differentiated service, CAR, MCAR