Re: [Lake] LoRaWAN use case; Re: WGLC for draft-ietf-lake-reqs-01

dominique.barthel@orange.com Thu, 02 April 2020 16:12 UTC

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From: <dominique.barthel@orange.com>
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Thread-Topic: [Lake] LoRaWAN use case; Re: WGLC for draft-ietf-lake-reqs-01
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Date: Thu, 2 Apr 2020 16:11:58 +0000
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Subject: Re: [Lake] LoRaWAN use case; Re: WGLC for draft-ietf-lake-reqs-01
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Hello Göran, all

(not sure anymore how I should write my answer)

>So, the current benchmark and available data points are all compliant with your challenge.
The numbers you provide indeed seem pretty much inline with the challenge I proposed, and I'll keep checking them as the WG progresses.
However, lets not be said that my challenge mandates the solution you propose (3 flights and 1 message per packet at SF12).
In draft-ietf-lake-reqs-02, the justification for 3 flights is Section 2.10.4, which I find kind of hand-wavy. (e.g., one could provide a similarly-hand-wavy counter argument to the 2*60 bytes vs. 3*40 bytes discussion: a shorter frame is less likely to suffer collision).

My point starting this discussion was to mention the 1 hour delay step effect as a transmitter reaches 36 s of air-time, which is not accurately reflected in column G of your spreadsheet and in the requirements draft.

> I think a benchmark should include all messages of the AKE and I would propose that we don’t formulate it in terms of uplink/downlink.
As much as I would love a general benchmark, I think LoRaWAN is very much an asymmetrical network and we need to acknowledge this fact.
I think it would do the LoRaWAN community a real service if we expressed the LAKE benchmark as two distinct cases : device-initiated AKE and infrastructure-initiated AKE. This would make it easier to map results onto real deployment cases.

Best regards,

Dominique

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