Subject: [tsvwg] New Liaison Statement, "LS to IETF TSVWG on MP-DCCP"

From: Liaison Statement Management Tool <[email-masked]>
Date: Mon, 17 May 2021 11:08:25 -0700

Title: LS to IETF TSVWG on MP-DCCP
Submission Date: 2021-05-17
URL of the IETF Web page: https://datatracker.ietf.org/liaison/1741/

From: David Pollington <[email-masked]>
To: Gorry Fairhurst <[email-masked]>,David Black <[email-masked]>,Wesley Eddy <[email-masked]>
Cc: Zaheduzzaman Sarker <[email-masked]>,Martin Duke <[email-masked]>,Transport Area Working Group Discussion List <[email-masked]>,Wesley Eddy <[email-masked]>,Gorry Fairhurst <[email-masked]>,David Black <[email-masked]>
Response Contacts: David Pollington <[email-masked]>
Technical Contacts: 
Purpose: For information

Body: 1. Background

The GSMA Zero Touch Connectivity (ZTC) taskforce is working on a number of propositions with a strong focus on operator provided multi-connectivity solutions for residential (Hybrid Access) and mobile customer usage based on 3GPP ATSSS, TS23.501 as well as alternative ‘ATSSS’ Overlay solutions independent of the 5G Core.

The operators engaged in GSMA ZTC consider MP-TCP (RFC8684; RFC8803) to be very beneficial based on the results from a number of ZTC trials. However, with the increasing share of QUIC in the overall traffic mix, a solution based solely on MP-TCP becomes a limiting factor and precludes delivery of a comprehensive customer proposition. 

For that reason, the GSMA ZTC taskforce has identified the multipath extension of DCCP (MP-DCCP) as a suitable network protocol for addressing this shortfall. MP-DCCP is an interesting candidate approach for the multipath transport of latency sensitive services and/or services with no or little demand on reliable delivery and also supports adjustable re-ordering.

The GSMA ZTC taskforce see MP-DCCP as an interesting solution to support multipath delivery of most traffic types in both residential broadband and cellular (3GPP) solutions. Available prototypes based on open source code from https://multipath-dccp.org/ have already shown an ability to provide Steering, Switching and Splitting.

Having formal support for MP-DCCP within IETF at the working group level would facilitate adoption in other standards bodies and vendor solutions and ensure a timely and satisfying solution for operator provided multi-connectivity services.

2. Request to IETF TSVWG
The GSMA ZTC taskforce kindly requests IETF TSVWG to adopt:
https://datatracker.ietf.org/doc/draft-amend-tsvwg-multipath-dccp/ 
for standard track as a complement to MP-TCP to meet Operator needs for multipath support.
Along with this, GSMA ZTC would like to request that you continue work on:
https://datatracker.ietf.org/doc/draft-amend-tsvwg-multipath-framework-mpdccp/ 
https://datatracker.ietf.org/doc/draft-amend-tsvwg-dccp-udp-header-conversion/ 

3. Contact
In the case of further questions and/or feedback to actions requested in the present document these can be directed to David Pollington, GSMA ZTC taskforce lead or Markus Amend, ZTC technical lead at DT [[email-masked]].
Attachments:

    ZTC_LS_01%20-%20GSMA%20ZTC%20LS%20to%20IETF%20TSVWG
    https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2021-05-17-gsma-ztc-tsvwg-ls-to-ietf-tsvwg-on-mp-dccp-attachment-1.docx