Subject: Re: [DMM] New Liaison Statement, "CP-173160: New Study Item on User Plane Protocol in 5GC"
From: "Sri Gundavelli (sgundave)" <[email-masked]>
To: Arashmid Akhavain <[email-masked]>, "[email-masked]" <[email-masked]>
Date: Fri, 13 Apr 2018 23:05:49 +0000
List-Id: Distributed Mobility Management Working Group <dmm.ietf.org>

Hi Arashmid,

I am not seeing a relation to the LS Response and the July 2018 deadline
that you are referring to. I think there is some disconnect here. Lets
review what we the chairs are thinking.

1. The work in IETF related to User-Plane optimizations will continue for
many months. When there is a LS Request, we will send a LS response. We
will use LS query/response as a means to gather feedback from the SDO
community, and provide an update on the status of all the documents in DMM
at this time. The status includes update on WG documents and individual
I-D’s under discussions.

2. We are not going with the assumption that there will only be a single
LS request/response for this entire UP Study, but we will keep exchanging
information based on the progress, and whenever we need additional
clarifications. 

3. There are multiple proposals in IETF. As we have indicated in the past,
we are not going to recommend THE single solution and put it on a platter
for 3GPP consumption, but rather the focus will be on characterization of
each approach that we take up in DMM WG.

Now, keeping this in mind, if there is a good reason not to send the LS
Response now, delay it by some time, or if we believe there is nothing to
respond, we can discuss and decide to do just that. Hope this makes sense.

Bottomline, all feedback is welcome!

Sri 

On 4/13/18, 1:35 PM, "Arashmid Akhavain" <[email-masked]>
wrote:

>Hi Sri,
>Thank you for getting back to us. They listed a few dates there. The
>final deadline is I guess July 2018.
>Are we targeting anything earlier?
>
>Arashmid 
>
>> -----Original Message-----
>> From: Sri Gundavelli (sgundave) [mailto:[email-masked]]
>> Sent: 13 April 2018 12:47
>> To: Arashmid Akhavain <[email-masked]>; [email-masked]
>> Subject: Re: New Liaison Statement, "CP-173160: New Study Item on User
>> Plane Protocol in 5GC"
>> 
>> Hi Arashmid,
>> 
>> We provide the status of the related work items in DMM, and seek any
>> clarifications on their CT4 work. Key thing from our point of view is
>>to get
>> their feedback on the work we are doing and try to meet their timelines.
>> 
>> Sri
>> 
>> 
>> On 4/12/18, 10:53 AM, "Arashmid Akhavain"
>> <[email-masked]>
>> wrote:
>> 
>> >Hi Sri,
>> >
>> >Any idea what the plan is once we pass this information to CT4?
>> >
>> >Arashmid
>> >
>> >> -----Original Message-----
>> >> From: dmm [mailto:[email-masked]] On Behalf Of Sri Gundavelli
>> >> (sgundave)
>> >> Sent: 12 April 2018 12:47
>> >> To: [email-masked]
>> >> Subject: Re: [DMM] New Liaison Statement, "CP-173160: New Study Item
>> >> on User Plane Protocol in 5GC"
>> >>
>> >> Please review and post your comments. Chairs will draft a response
>> >>for WG  review.
>> >>
>> >> Sri
>> >>
>> >>
>> >> On 4/11/18, 11:16 AM, "Liaison Statement Management Tool"
>> >> <[email-masked]>
>> >> 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-masked]>
>> >> >To: Sri Gundavelli <[email-masked]>,Dapeng Liu
>> >> ><[email-masked]>
>> >> >Cc: Dapeng Liu <[email-masked]>,Terry Manderson
>> >> ><[email-masked]>,Distributed Mobility Management
>> >> >Discussion List <[email-masked]>,Sri Gundavelli
>> >> ><[email-masked]>,Suresh Krishnan <[email-masked]> Response
>> Contacts:
>> >> >[email-masked],[email-masked]
>> >> >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-2018-04-11-3gp
>> >> >p-t
>> >> >sgc
>> >> >t-ct4-dmm-cp-173160-new-study-item-on-user-plane-protocol-in-5gc-att
>> >> >ach
>> >> >men
>> >> >t-1.doc
>> >> >
>> >>
>> >> _______________________________________________
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>> >> [email-masked]
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>