Abstract
SummaryTypically, LoRaWAN utilizes an adaptive data rate (ADR) for resource assignment (e.g., spreading factor and transmit power) to a large number of end devices (EDs). However, the slow adaptation of the spreading factor and transmitting power strategy makes the ADR vulnerable to destructive concurrent transmissions, resulting in massive packet collision. Therefore, this paper analyzes the impact of massive concurrent transmissions and proposes a novel “nondestructive adaptive data rate (ND‐ADR)” approach to address the packet collision problem. The proposed ND‐ADR aims to monitor the destructive concurrent transmissions proactively and mitigate them by allocating nondestructive transmission time to EDs. The proposed ND‐ADR ensures high robustness and reliability by reducing the chances of destructive transmissions and retransmissions. Results show that the proposed ND‐ADR outperforms the existing state‐of‐the‐art ADRs in packet success ratio and energy consumption.
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