Re: [lp-wan] Doub about sending missing tiles

[Rodrigo Muñoz Lara <[e-mail]>]

Hi

Thanks for your answer. Yes, that is the answer to my question.

Related to the same,  I have a new question

The draft indicates that when the sender receives a SCHC ACK with a bitmap
that indicates lost tiles, the sender must send the lost tiles in a new
SCHC fragment.

My question is, what happens if the lost tiles are not contiguous? Should
the sender send them in the same way in a single SCHC fragment? How do I
tell the recipient which tiles I am sending in the SCHC fragment if the
lost tiles are not contiguous?

Thanks

El lun., 30 dic. 2019 a las 14:29, <[e-mail]> escribió:

> Hello Rodrigo,
>
> Thanks for you mail.
> I'm unsure about what part of the text you actually refer to.
> Section 8.3.1.2 is about the All-1 Fragment SCHC format
>
> https://tools.ietf.org/html/draft-ietf-lpwan-ipv6-static-context-hc-24#section-8.3.1.2
>
>
> From the text you quote, I think you are talking about the Sender Behavior
> of Ack-on-Error mode (section (8.4.3.1).
> In this section, we are simply saying that the Sender must resend the
> missing tiles. It may use several Fragments for this.
> It does not matter that the tiles are re-send packed the same way in SCHC
> Fragments as they were packed in the initial transmission.
> Typically, if the MTU has changed to a lower value since the initial
> transmission, the retransmitted tiles will have to be packed in a different
> way (less tiles per SCHC Fragment).
> Does this answer your question?
> Best regards, and happy end of year
>
> Dominique
>
> De : lp-wan <[e-mail]> on behalf of Rodrigo Muñoz Lara <
> [e-mail]>
> Date : Friday 27 December 2019 14:33
> À : "[e-mail]" <[e-mail]>
> Cc : "[e-mail]" <[e-mail]>, Sandra Cespedes <
> [e-mail]>
> Objet : [lp-wan] Doub about sending missing tiles
>
> Dear Author,
>
> I have a question about draft
> "draft-ietf-lpwan-ipv6-static-context-hc-24". In section 8.3.1.2 say:
>
> "*On receiving a SCHC ACK, if the W field in the SCHC ACK not corresponds
> to the last window of the SCHC Packet:*
>
>    -
>
>    *MUST send SCHC Fragment messages containing the tiles that reported missing in the SCHC ACK*"
>
>
>
> What happened if the missing tiles do not fit in a SCHC fragment?
>
> Regards
>
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