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In LoRaWAN, each node transmits packets autonomously, so packet collisions occur when multiple nodes transmit packets at the same time and frequency. However, the clocks of inexpensive LPWAN nodes are generally not highly accurate, and synchronization errors can occur between devices over time. In addition, in single-hop LoRaWAN, it is not possible to achieve high data rates and a wide communication range at the same time. By using multi-hop communication, it is possible to achieve a wide communication range while maintaining a high data rate. However, LoRaWAN multi-hop communication suffers from the hidden node problem, throughput degradation due to the inability to transmit and receive packets simultaneously, and power consumption due to the need to constantly open the receive window. This paper proposes an autonomous distributed adaptive resource allocation method to solve the above problems. Specifically, we show that by assigning packet transmission slot decisions based on LoRaWAN packet information, the transmitting and receiving sides can share transmission and reception locations, avoid packet collisions, and reduce power consumption by avoiding unnecessary opening of reception windows.
Shida et al. (Mon,) studied this question.