On the Uplink Repetitions in LoRaWAN

Dimitrios Zorbas, Aruzhan Sabyrbek

2025

Closed access Metadata (CSL-JSON)
DOI 10.1109/lnet.2025.3622036
Data confidence 70 medium
How this score is calculated

It is built from checkable properties of the record itself: whether the article has a DOI, how many independent sources confirmed its data, whether the required fields are filled in, and how recent the latest confirmation is. Disagreement between sources and a missing identifier lower it. A value of 80 or above means the record was published without further checking; 60 to 79 means it is published at reduced confidence, with a manual check advisable. A record verified by an editor by hand is never pushed below 90 by a recalculation. This scores our data about the article, not the article itself.

Abstract

Ensuring reliable data delivery in LoRaWAN is challenging due to interference and path loss. This paper analyzes the trade-off between using acknowledgments (ACKs) and successive uplink retransmissions without ACKs. While ACKs confirm reception, they consume downlink capacity and suffer from low delivery ratios due to duty cycle limits and half-duplex hardware. Retransmissions avoid downlink use but increase collision risk. Through probabilistic modeling and simulations, we show that repeated uplinks improve reception probability by 11% compared to using ACKs, even though the latter case offers better reliability in some cases. Moreover, ACKs increase energy consumption by about 14.6% on average in the selected simulated scenarios.