Re: [lp-wan] Flow validation in ACK-on-error Mode

[Olivier Gimenez <[e-mail]>]

Hi Rodrigo,

From what I understand the second image your question is: “How does the transmitter knows when to send the All-1 SCHC message” ?
In LoRaWAN class A there is no way to initiate communication from the network, device has to send an uplink so it can open RX windows.

So the device can send the All-1 as soon as RX1, RX2 widows are over without downlink. Please see attached picture

I propose to change the following sentence of §5.1.1, it is clearer for you ?

> At the end of a window or a
> fragmentation session, corresponding ACK(s) is (are) transmitted
> by the network gateway (LoRaWAN application server) in the RX1 or
> RX2 receive slot of end-device.  If this ACK is not received the
> end-device sends an all-0 (or an all-1) fragment with no payload
> to request an SCHC ACK retransmission.

to

> At the end of a window or a
> fragmentation session, corresponding ACK(s) is (are) transmitted
> by the network gateway (LoRaWAN application server) in the RX1 or
> RX2 receive slot of end-device.  If this ACK is not received *by* the
> end-device *at the end of its RX windows, it* sends an all-0 (or an all-1) fragment with no payload
> to request an SCHC ACK retransmission.

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