A LoRaWAN-MAC Protocol Based on WSN Residual Energy to Adjust Duty Cycle

With the expansion of the scale of wireless sensor networks, people have higher requirements for the real-time nature of receiving information and the power consumption of network equipment. LoRa technology for low-power wide-area networks has been produced, but the energy consumption of network terminal nodes is still facing huge problems. Challenge. In this thesis, the REDS strategy based on LoRa technology is proposed. First, the residual energy is used to detect the preamble in the beacon, so that CAD can judge the effective preamble from the noise to avoid false wake up. Then use the remaining energy of the nodes in the remote Sink area of the network to activate the node and perform CAD channel detection. The node selects the communication access method according to the channel quality. When the network traffic load is low, the node communicates according to the CSMA-CA competition method. When the traffic load in the network is high, the nodes communicate and access according to the dynamic duty cycle method. It is proved that the network delay can be reduced by 29% and the energy efficiency can be improved by 19%. Thereby avoiding data collisions, improving channel utilization, and weighing the trade-off between network delay and network energy consumption.