This paper explores the possibility of having confirmed traffic in LoRaWAN networks under channel-oblivious jamming. Our results show that a LoRaWAN cell can handle up to 500 end-devices with a relatively good message success probability 0.8 if the network is strongly jammed 60 % of the time by using a maximum of 16 re-transmissions.

We have also proved that using a channel for downlink transmissions operating in the lowest SF is a major weakness in the LoRaWAN specification. Indeed, our results suggest that for a LoRaWAN cell with 600 end-devices the network goodput can be decreased by 53.06 % when ACK transmissions on the second receive window are allowed. This was done by using an open-source network simulator that allows evaluating many scenarios that can help LoRaWAN operators to better scale their networks in order to be more resilient against jamming attacks before actual deployments.