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

Juan Carlos Zuniga <juancarlos.zuniga@sigfox.com> Mon, 16 September 2019 16:06 UTC

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From: Juan Carlos Zuniga <juancarlos.zuniga@sigfox.com>
To: Rodrigo Muñoz <rodrigo.munoz.lara@gmail.com>, "lp-wan@ietf.org" <lp-wan@ietf.org>
CC: Sandra Cespedes <scespedes@ing.uchile.cl>
Thread-Topic: [lp-wan] Flow validation in ACK-on-error Mode
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Date: Mon, 16 Sep 2019 16:06:28 +0000
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Archived-At: <https://mailarchive.ietf.org/arch/msg/lp-wan/_BddWIDbH-k3U9xeucv83ZaLhWM>
Subject: Re: [lp-wan] Flow validation in ACK-on-error Mode
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Hello Rodrigo,

Thanks for your enquiry.

In your flow, you are showing a “Retransmission Timer” time between the retransmitted Reg Frag 1 and the All-1.

If the All-1 is the fragment that would have normally followed Reg Frag 4, there is no need for the sender to wait between retransmitting Reg Frag 4 and the All-1.

This All-1 would trigger again the receiver to send a SCHC ACK, which would notify the sender of the correct (or not) reception of all the previous fragments.

I hope this helps.

Best,

Juan Carlos

From: lp-wan <lp-wan-bounces@ietf.org> On Behalf Of Rodrigo Muñoz
Sent: September 16, 2019 10:42 AM
To: lp-wan@ietf.org
Cc: Sandra Cespedes <scespedes@ing.uchile.cl>
Subject: [lp-wan] Flow validation in ACK-on-error Mode

Dear Author,

I am working on the implementation of the SCHC standard for Sigfox and LoRaWAN. I have the following doubt regarding the data flow when there is a failure in the transmission of a SCHC fragment in the ACK-on-error Mode.

In this email, I attach my draft compression. Is this flow ok?

I have assumed the following:

  *   The SCHC Ack is sent immediately by the receiver at the end of the window.
Regards
--
-------------------------------------------
Rodrigo Muñoz Lara