Since each sensor node in the Wireless Sensor Network operates with a battery of limited power, energy efficiency in the sensor network is an important issue. Therefore, by reducing the energy consumption of the sensor nodes, the overall network lifespan of the sensor network can be maximized. Various protocols have been proposed in the MAC layer by researchers. In this paper, an energy-efficient adaptive buffer threshold MAC (AB-MAC) has been proposed, to improve the energy efficiency of sensor networks without affecting the average latency. The protocol sets a buffer threshold for each node, which determines whether data is to be transmitted or not. The threshold will be set differentially according to the distance between the sink and the transmitting node, thereby reducing the energy consumption of the node and greatly improving the energy efficiency of the entire network. In addition, to reduce the transmission delay time, the data transmission will be performed according to the priority of sensed data. The performance evaluation is done through MATLAB, the proposed protocol is compared with the S-MAC and T-MAC protocols, it was confirmed that the proposed technique improved the data transmission time and energy efficiency, hence extended the network lifespan
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