ADR Edge case & Endians

[Lawrence Griffiths]

I have a number of end-devices on DR5 but during the day the RF environments gets noisy. I can see SNR of -10 and lot of doped frames.

So I thought I might try ADR cmd on my dev setup in the office.
So I can decrease the DR to say DR3 I get one or two frames at that rate.
Then the network server says No, and bumps my end-device up to DR5.

I thought it was at least 20 frames before the NS did ADR evaluation?
It looks like my approach isn’t going to work any thoughts?

Also it I’m confused on a Dot AT+CHM uses Big Endian 01FF
and ADR cmd on the NS uses Little Endian FF01 for the Channel Mask?

> new Buffer(“0341ff0101”, “hex”).toString(“base64”)
‘A0H/AQE=’

Thanks
Lawrence

• This topic was modified 5 years, 1 month ago by Lawrence Griffiths.
• This topic was modified 5 years, 1 month ago by Lawrence Griffiths.

[Jason Reiss]

What version of AEP are you testing?

LoRaWAN 1.0.3
Section 1.2
The octet order for all multi-octet fields is little endian

The channel mask in LinkADRReq is sent little endian.

[Lawrence Griffiths]

Jason thanks helps to look..

I’m running AEP v1.7.0 on a Conduit
I have a v1.6.2 in the field and in the office should I try that?

Lawrence

[Jason Reiss]

AEP 1.7.0 has improved ADR over 1.6.2.

The network server will need a minimum of 6 packets before sending an update.
The network server will assign a DR to each of the last 11 packets based on SNR. If a DR has 6 packets assigned and is higher than the current DR an LinkADRReq is sent, unless a request has been sent in the last 4 packets.

The ADR packets tracking is always occuring. So if a device as ADR bit unset and sends several uplinks. It can get a LinkADRReq on the first downlink after setting ADR bit.

Also it will send an update every four packets if lowering the power at max DR until SNR is below 3 dB or min Power is reached.

[Lawrence Griffiths]

Ok so I should be ok in the field as once I’ve dropped DR & device is using it I send a ADR disable cmd which it has.

But doesn’t look like my edge case will be solvable with manual ADR when running on v1.7.0.

Thanks
Lawrence

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