Various Techniques Use In Wireless Sensor Network For Congestion Control

In WSN, usually tens or thousands of sensor nodes are deployed, scattered way in an area with one or more sinks. Moreover, for achieving reliability and load balancing, several multipath routing protocols have been proposed. But the limitation of these protocols is traffic overhead. Thus the occurrence of congestion in this situation is more likely.[3] The situation becomes worse when congestion occurs in multiple paths. In order to achieve the desired rate of heterogeneous traffic by the sink the congestion control over multiple paths is indispensable. In this paper we focus on Congestion detection, congestion notification and congestion mitigation through rate control to avoid congestion in a network and we also propose an efficient scheme to perform multipath congestion control for heterogeneous traffic which avoids packet loss and thus enhances the probability of achieving the desired throughput of heterogeneous traffic. Our congestion detection mechanism is chosen based on packet service ratio and congestion notification is implicit. As many reasearchers in wireless sensor network worked on the problem of congestion and propose a technique such as priority based congestion control protocol, congestion detection and avoidance in sensor netwroks.