DETECTING AND EFFECTIVE ROUTING OF TIME CRITICAL EVENTS USING CONGESTION AND DELAY AWARE ROUTING IN WSNS

Abstract

Reliability and timeliness are two essential requirements of successful detection of critical events n Wireless Sensor Networks (WSNs). The base station (BS) is particularly interested about reliable and timely collection of data sent by the nodes close to the ongoing event, and at that time, the data sent by other nodes have little importance. In this paper, we modify Congestion and Delay Aware Routing (CODAR) protocol that tries to route data to the multiple sinks in congestion and delay aware manners. In this case every sensor communicates with the closest sink. If congestion occurs, it also mitigates congestion by utilizing an accurate data-rate adjustment. Each node collects control information from neighbours and works in a distributed manner. Experimental results show that modified CODAR protocol is capable of avoiding and mitigating congestion effectively, and performs better than similar known techniques in terms of reliable and timely event detection.