一种基于LoRaWAN的自适应多帧高效传输方法 postprint

Abstract: As for the problem that the control overhead and transmission delay are large in multi-frame transmission mode between LoRa gateway and LoRa terminal in LoRaWAN protocol, this paper proposed an adaptive multi-frame transmission method, which includes adaptive multi-frame sending mechanism, adaptive multi-frame receiving confirmation mechanism and frame loss recognition mechanism. The first mechanism sets priority level of the confirmed messages, it make confirm immediately for high-level confirmed messages, and confirms for low-level confirmed messages uniformly after the end of adaptive sending mode. At the same time, the Fpending mechanism is introduced into LoRaWAN uplink multi-frame transmission. The second mechanism records the received message frame information by bit vector compression technology, so as to merge confirm for multiple confirmed messages once. The third mechanism uses the CDID value to identify whether the low-level acknowledgment message is lost, and prevents the terminal from entering the sleep mode abnormally. The mathematical analysis and experimental test results show that the AMFET mechanism can effectively reduce data transmission delay and data transmission energy consumption on the premise of guaranteeing the reliability of data transmission compared to the original mechanism.