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Wireless Sensor Networks (WSNs) consist of miniature sensor nodes, capable to operate and capture events in human-inaccessible terrains. The data packets generated by these networks may either be continuous, event-based or query-driven, and are application-specific in nature. These packets need to be transmitted in an energy-efficient manner to the base station. In these networks, congestion occurs when the incoming traffic load exceeds the available capacity of the network. There are various factors that lead to congestion in WSNs such as buffer overflow, varying rates of transmission, many-to-one communication paradigm, channel contention and the dynamic nature of a transmission channel. Congestion leads to depletion of the nodes energy, deterioration of network performance and an increase in network latency and packet loss. As a result, energy-efficient congestion control protocols need …