Thanks for raising this topic. With https://tools.ietf.org/html/draft-amend-iccrg-multipath-reordering-01 we consider exactly that and try to provide input to develop/discuss different re-ordering strategies. My personal belief is, that without any re-ordering implementation in the UPF or UE the end-to-end delivery will be worse.
From: QUIC <[email protected]> On Behalf Of Kazuho Oku Sent: Dienstag, 1. Dezember 2020 11:29 To: [email protected] Cc: Magnus Westerlund <[email protected]>; Liaison Statement Management Tool <[email protected]>; [email protected]; [email protected]; [email protected]; Lucas Pardue <[email protected]>; Marten Seemann <[email protected]>; Lars Eggert <[email protected]>; QUIC Discussion List <[email protected]>; Martin Duke <[email protected]> Subject: Re: New Liaison Statement, "LS on ATSSS Phase 2 conclusions" 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 <[email protected]<mailto:[email protected]>>: Hi, Here is a pdf version. Regards, Lionel De : Marten Seemann [mailto:[email protected]<mailto:[email protected]>] Envoyé : mardi 1 décembre 2020 05:17 À : Liaison Statement Management Tool <[email protected]<mailto:[email protected]>> Cc : Lucas Pardue <[email protected]<mailto:[email protected]>>; Lars Eggert <[email protected]<mailto:[email protected]>>; Magnus Westerlund <[email protected]<mailto:[email protected]>>; MORAND Lionel TGI/OLN <[email protected]<mailto:[email protected]>>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; [email protected]<mailto:[email protected]>; QUIC Discussion List <[email protected]<mailto:[email protected]>>; Martin Duke <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> 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 <[email protected]<mailto:[email protected]>> To: Lars Eggert <[email protected]<mailto:[email protected]>>,Lucas Pardue <[email protected]<mailto:[email protected]>> Cc: QUIC Discussion List <[email protected]<mailto:[email protected]>>,Martin Duke <[email protected]<mailto:[email protected]>>,Magnus Westerlund <[email protected]<mailto:[email protected]>>,Lucas Pardue <[email protected]<mailto:[email protected]>>,Lars Eggert <[email protected]<mailto:[email protected]>>,[email protected]<mailto:[email protected]>,[email protected]<mailto:[email protected]> Response Contacts: [email protected]<mailto:[email protected]>,[email protected]<mailto:[email protected]> 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 _________________________________________________________________________________________________________________________ Ce message et ses pieces jointes peuvent contenir des informations confidentielles ou privilegiees et ne doivent donc pas etre diffuses, exploites ou copies sans autorisation. Si vous avez recu ce message par erreur, veuillez le signaler a l'expediteur et le detruire ainsi que les pieces jointes. Les messages electroniques etant susceptibles d'alteration, Orange decline toute responsabilite si ce message a ete altere, deforme ou falsifie. Merci. This message and its attachments may contain confidential or privileged information that may be protected by law; they should not be distributed, used or copied without authorisation. If you have received this email in error, please notify the sender and delete this message and its attachments. As emails may be altered, Orange is not liable for messages that have been modified, changed or falsified. Thank you. -- Kazuho Oku
