Will adaptive data rate help the end device determine the best max data rate if the gateway is a distance away? I.e. if certain data rates are not sufficient for a given range/distance of communication, will the end device + gateway be able to work this out? Thanks for the help.

Yes, that is what it is intended to do. Worth noting however that the logic is in the network server, not the gateway (gateways have very minimal internal logic). The network server considers the signal reports from any and all gateways receiving each packet, and tells the node to adjust settings …

How does a gateway signal to a node that its packets are not reaching that gateway in the first place? I mean, if the node is using a higher data rate than it should and is thus not able to reach the gateway, then obviously the gateway cannot send a downlink message to the node to adjust its data ra…

[image] LloydXmas: How does a gateway Again, gateways really don’t do anything. The Network server acts through gateways. It cannot, of course So nodes start in the most long range mode (high spreading factor, ie low data rate, and high RF power) and then may be commanded to go to a short…

[image] LloydXmas: Do nodes using ADR start with a high data rate and then send recurring packets with lower and lower data rates? You may see this for OTAA. Like EU868 LMIC first tries the default channels at some initial data rate that is configured in the device. This may very well be the …

[image] cslorabox: So nodes start in the most long range mode (high spreading factor, ie low data rate, and high RF power) and then may be commanded to go to a shorter range mode if the received signal indicators suggest that would be workable. That is not necessarily true! Many devices start…

As for the data rate for OTAA, Semtech writes in Joining and Rejoining : In addition to random frequency selection, randomly selecting available DataRates (DRs) for the region that you want is also important. Note: It is important to vary the DR. If you always choose a low DR, join requests will t…

Some join sequences seem to hit the same SF several times before moving on - a quick run through from to 7 to 0 would seem more efficient, possibly trying a couple of times at the 7, 8 & 9, travelling hopeful, before using up air time & battery banging away at SF12 in vain. Then perhaps backoff for…

I don’t understand the logic of ADR: If I keep sending unconfirmed messages, that means I don’t need to any downlink acknowledgment. So even if I don’t receive the downlink after 64+32 uplinks, it doesn’t mean that I need ADR to make any adjustments. Isn’t that against my original intention?

The point of ADR is to tune a devices signal to its environment by changing the Data Rate. If it’s being received with great signal strength, then the DR can be dropped, using less power for the device and less air time for the community as a whole. It’s the device transmission that’s key here, no…

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ADR and gateway distance

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arjanvanb (Arjan) August 16, 2020, 4:38pm 10