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In wireless sensor networks, contention causes message collisions, which are very likely to occur when traffic is frequent and correlated, and hence decreases the lifetime of the network. Also congestion happens due to contention which is caused by concurrent transmissions. In this paper, the authors propose to develop a Hop-by-hop congestion control protocol for wireless sensor networks to mitigate traffic contention. In the proposed protocol, each node calculates its node rank based on the parameters buffer Size, hop count, channel busy ratio and MAC overhead. When the node rank crosses a threshold value T, the sensor node will set a congestion bit in every packet it forwards.
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