Re: New Liaison Statement, "LS on ATSSS Phase 2 conclusions"

[Kazuho Oku <[e-mail]>]

Lionel, thank you for converting the statement to PDF.

Reading the document, I have one question.

"The simultaneous transmission of a data flow across two accesses should
not result in out-of-order delivery"

I wonder what this sentence means. Is it suggesting that UPF (and possibly
UE) would buffer packets that arrive on the faster path until the packets
that were sent on the slower path reach that node? To give an example,
let's say that UE has sent three packets: packet 1 sent using WiFi, packet
2 using LTE, packet 3 using WiFi. UPF receives packets in the order of 1,
3, 2. Is UPF expected to postpone the forwarding of packet 3 until it
receives packet 2?

I raise the question, because during the interim, some have pointed out
that such buffering has negative effects on loss recovery, and that we
should devote our efforts to designing an end-to-end multi-path design,
rather than having an intermediary that aggregates paths (in this case UPF).


2020年12月1日(火) 18:43 <[e-mail]>:

> Hi,
>
>
>
> Here is a pdf version.
>
>
>
> Regards,
>
>
>
> Lionel
>
>
>
> *De :* Marten Seemann [mailto:[e-mail]]
> *Envoyé :* mardi 1 décembre 2020 05:17
> *À :* Liaison Statement Management Tool <[e-mail]>
> *Cc :* Lucas Pardue <[e-mail]>; Lars Eggert <
> [e-mail]>; Magnus Westerlund <[e-mail]>;
> MORAND Lionel TGI/OLN <[e-mail]>;
> [e-mail]; [e-mail]; [e-mail];
> QUIC Discussion List <[e-mail]>; Martin Duke <[e-mail]
> >
> *Objet :* Re: New Liaison Statement, "LS on ATSSS Phase 2 conclusions"
>
>
>
> Would it be possible to publish this document in a format that can be
> opened by everyone without using proprietary software?
>
>
>
> Thank you,
>
> Marten
>
>
>
> On Mon, Nov 30, 2020 at 10:40 PM Liaison Statement Management Tool <
> [e-mail]> wrote:
>
> Title: LS on ATSSS Phase 2 conclusions
> Submission Date: 2020-11-30
> URL of the IETF Web page: https://datatracker.ietf.org/liaison/1710/
>
> From: Susanna Kooistra <[e-mail]>
> To: Lars Eggert <[e-mail]>,Lucas Pardue <[e-mail]
> >
> Cc: QUIC Discussion List <[e-mail]>,Martin Duke <
> [e-mail]>,Magnus Westerlund <[e-mail]>,Lucas
> Pardue <[e-mail]>,Lars Eggert <[e-mail]>,
> [e-mail],[e-mail]
> Response Contacts: [e-mail],[e-mail]
> Technical Contacts:
> Purpose: For information
>
> Body:
> Attachments:
>
>     S2-2009400_8852r02
>
> https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2020-11-30-3gpp-tsgsa-sa2-quic-ls-on-atsss-phase-2-conclusions-attachment-1.doc
>
>
>
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-- 
Kazuho Oku