INTEGRATING FAIRNESS IN CURRENT CONSUMPTION OF END DEVICES IN TIME–SLOTTED LORA–BASED WIRELESS SENSOR NETWORK

The study introduces the Group Acknowledgement Circular Shift (GACS) algorithm, aimed at improving fairness in the current consumption of End Devices (EDs) in a time-slotted LoRa-based Wireless Sensor Network (WSN). This algorithm manages the rotation and scheduling of data transmission and reception times for nodes based on the number of nodes (SN) within each group slot. Employing MATLAB for simulations, performance evaluation utilizes Jain's Fairness Index. Two scenarios are explored: one with Group Acknowledgement (GA) excluding Circular Shift (CS) and another with Group Acknowledgement incorporating Circular Shift (GACS). Simulations involve a network with ten (10) EDs and a gateway across ten transmission cycles. Results indicate that under GA without CS, fairness is 98.32%, significantly improving to 99.75% with GACS. This improvement persists even with a transmission cycle of 100. Additional simulations maintain same transmission parameters but change payload to 54 bytes, set nodes to 50, and establish a transmission cycle of 50. In the GA without CS scenario, Jain's fairness index is 94.22%, while the GACS scenario shows a higher index of 98.68%. Overall, the study emphasizes the robust fairness index of the GACS algorithm, irrespective of the SN within each group slot, with nodes consistently exhibiting uniform current consumption at every SNth cycle.