ChmaskCntl?

[wporras@cdtdegas.com]

Hi,
I have a MultiConnect® Conduit® IP67 Base Station GNSS Global version for 915 US, I have a provider of certified nodes that requests the parameter “ChMaskCntl”, I never heard it and I do not remember having it configured in my gateway. I’ve been reading a bit about it but I’m still confused about it.

I appreciate who can help me.

[Jason Reiss]

It is part of the LinkAdrReq MAC command. The ADR algorithm controls the ChMaskCtrl bits to enable the correct channel according to selected FrequencySubBand.

https://lora-alliance.org/resource-hub/lorawanr-specification-v103

[wporras@cdtdegas.com]

Thanks for your answer, Is there a default value for this gateway?

[Jason Reiss]

The regional parameters page 23 shows a table of how the channel mask control field is used in US915.
https://lora-alliance.org/resource-hub/lorawan-regional-parameters-v103reva

The network server determines the commands to send depending on what channels need to be enabled.

In LoRaWAN 1.0.2 and before two commands are needed to set to a single FrequencySubBand. The first disables all 125 kHz channels and enables one 500 kHz channel. The second enables a block of 8 channels. Some sets of channels would need several commands to be enabled.

ChMaskCtrl 7 and 0-3 are used

FSB1: 0300010071 & 0300ff0001
FSB2: 0300020071 & 030000ff01
FSB3: 0300040071 & 0300ff0011
…
FSB8: 0300800071 & 030000ff31

In LoRaWAN 1.0.3 the option (5) to set the block of 125 kHz channels and a single 500 kHz channel was added. This allows a set of channel blocks to be enabled/disabled with one command.

ChMaskCtrl 5 is used.

FSB1: 0300010051
FSB2: 0300020051
FSB3: 0300040051
FSB4: 0300080051
…
FSB8: 0300800051

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