Hello folks,
The liaison statement seems to suggest that the existing work in 3GPP is
either to develop the 5G architecture, or to see how well the current
evolution of GTP-U fits the 5G architecture as developed. It is natural
to also expect that the thinking about the 5G architecture has been
influenced by the known behavior and features of GTP-U. The further
guidance in the Liaison statement seems to recommend familiarity with
23.50{1,2,3} and 33.501.
I've had a look at some of the documents, and they can be pretty heavy
sledding.
draft-bogineni-dmm-optimized-mobile-user-plane-00 is somewhat more
compact. And yet it also focuses a lot of attention on SMF as well as UPF.
Is the IETF expected to make comments only about UPF?
Some previous discussion suggested that whatever UPF would be developed
in the IETF, needed to be independent of the control plane. But
presumably 3GPP would like a UPF that offered the control features that
are required for SMF as well. That's a lot of additional features. It
seems to place additional constraints on whether or not an IETF
user-plane protocol would be useful for 3GPP.
If the task is only to provide information to 3GPP about what [dmm] is
doing, then the task is manageable. But if we are also required to
describe how an IETF user-plane protocol meets or does not meet the
requirements in {2,3}3.50{1,2,3} -- that's a difficult task. Moreover,
the charging framework has usually been considered outside the
jurisdiction of IETF if I remember correctly -- something about anti-trust.
Regards,
Charlie P.
On 4/11/2018 11:16 AM, Liaison Statement Management Tool wrote:
Title: CP-173160: New Study Item on User Plane Protocol in 5GC
Submission Date: 2018-04-11
URL of the IETF Web page: https://datatracker.ietf.org/liaison/1572/
Please reply by 2018-07-20
From: Satoru Matsushima <[email protected]>
To: Sri Gundavelli <[email protected]>,Dapeng Liu <[email protected]>
Cc: Dapeng Liu <[email protected]>,Terry Manderson <[email protected]>,Distributed
Mobility Management Discussion List <[email protected]>,Sri Gundavelli <[email protected]>,Suresh
Krishnan <[email protected]>
Response Contacts: [email protected],[email protected]
Technical Contacts:
Purpose: For action
Body: 1. Overall Description:
3GPP working group of CT4 (Core and Terminal) would like to inform the IETF
that CT4 has initiated a study item on user plane protocol in 5GC for
Release-16 of 5G phase 2 (see CP-173160).
Based on the outcome from the IETF / 3GPP Coordination meeting at IETF#100,
3GPP CT4 got aware that IETF DMM WG is currently working on a possible
candidate protocol for the 3GPP 5G user plane protocol.
3GPP CT4 wants to emphasize that currently there is no related evaluation
ongoing in 3GPP. Nevertheless, a study item was approved for such a study to
start in the second half of 2018. The study will evaluate between existing
solutions within 3GPP and other protocols, based on the Release 16 stage 2
(system architecture) requirements.
3GPP CT4 would like to point IETF DMM to the following specifications on GTP-U.
The Release 16 stage 2 requirements are not yet known but it is worth looking
at latest GTP-U spec which will be evaluated through the study as the existing
protocol.
• [1] 3GPP TS 29.281 (V15.1.0): GPRS Tunnelling Protocol User Plane
(GTPv1-U)
Following technical report provides information of how 3GPP considered GTP-U
apply to user plane of 5G_ph1:
• [2] 3GPP TR 29.891 (V15.0.0): 5G System – Phase 1; CT4 Aspects
Furthermore, 3GPP would like to give the following general guidance to IETF
DMM, regarding user plane transport within 3GPP networks. These are technical
specifications that include also the necessary information to understand which
architectural, QoS, security-related and high-level requirements GTP-U
currently complies to within 5G_ph1.
• [3] 3GPP TS 23.501 (V15.0.0): System Architecture for the 5G System
• [4] 3GPP TS 23.502 (V15.0.0): Procedures for the 5G System
• [5] 3GPP TS 23.503 (V15.0.0): Policy and Charging Framework for the 5G
System
• [6] 3GPP TS 33.501 (V0.6.0): Security Architecture (work in progress)
2. Actions:
To IETF DMM:
ACTION: CT4 respectfully asks IETF DMM to provide any information that
may be relevant to the above CT4 work by July 2018.
3. Date of Next CT and CT4 Meetings:
CT4#83 26th Feb – 2nd Mar 2018 Montreal, CAN
CT#79 19th – 20th Mar 2018 Chennai, India
CT4#84 16th – 20th April 2018 Kunming, China
CT4#85 21st – 25th May 2018 Osaka, Japan
CT#80 11th – 12th June 2018 La Jolla, USA
CT4#85-bis 9th –13th July 2018 TBD, France
CT4#86 20st – 24th Aug 2018 TBD, USA
Attachments:
CP-180116
https://www.ietf.org/lib/dt/documents/LIAISON/liaison-2018-04-11-3gpp-tsgct-ct4-dmm-cp-173160-new-study-item-on-user-plane-protocol-in-5gc-attachment-1.doc
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