Subject: [tsvwg] Notes: Side meeting on Transport implications of 3GPP Access Traffic Steering, Switching & Splitting

From: <[email-masked]>
Date: Fri, 1 Apr 2022 14:15:01 +0000

Dear all,

Please allow me to share some notes about a side meeting that was announced and held during IETF113: https://datatracker.ietf.org/meeting/113/materials/slides-113-tsvwg-41-announcements-00

In-person side-meeting with ca 15 attendees, Friday 25th of March, 12.30 - 1.30 UTC Green Room1 venue hotel

Topic: Side meeting on Transport implications of 3GPP Access Traffic Steering, Switching & Splitting

Introduction: 3GPP ATSSS is an operator provided transparent multi-path transport (Wi-Fi + 5G) between UE and mobile core. 

Deutsche Telekom 3GPP SA2 delegate presented ATSSS overview, timeline, scope: https://raw.githubusercontent.com/markusa/ietf113-ATSSS-sidemeeting/main/3GPP_ATSSS_Workplan_Rel18.pdf

- IETF relevance: Network protocols for splitting (multi-path transport) of non-TCP traffic flows is wanted for Rel. 18 (slide 8)

- MP-DCCP and MP-QUIC are the solution candidates discussed in the ongoing Rel. 18 study phase

- 3GPP identified protocols and extensions needs RFC status end of 2023 (see non-exhaustive list slide 11+12)

Other discussion points:

- Implication of several stacked security layers when QUIC application traffic is encapsulated over a ATSSS MP-QUIC connection scheduled over an IPsec protected Wi-Fi path (non-3GPP untrusted connection)
- Impact of multi-layer multi-path within application and ATSSS. Can TAPS provide measures here?

Overall, this meeting had an informational character and served to exchange views among ATSSS interested peoples, explained the 3GPP/IETF touchpoints and timelines. No decisions were forced!

Br

Markus