Hi Sri,
Thank you for clarification. I never suggested that IETF should single out a 
particular proposal. On the contrary, I believe DMM should simply conduct the 
study and provide 3GPP with all different options. 3GPP will decide what to do 
with the proposals from that point on. As you mentioned there could be several 
back and forth between the two SDOs. 

So, while I agree with all points, I am still puzzled by the following 
statement in 3GPP email. 
What is the significance of the July 2018 date? 

ACTION:
CT4 respectfully asks IETF DMM to provide any information that may be relevant 
to the above CT4
work by July 2018.

Arashmid

> -----Original Message-----
> From: Sri Gundavelli (sgundave) [mailto:sgund...@cisco.com]
> Sent: 13 April 2018 19:06
> To: Arashmid Akhavain <arashmid.akhav...@huawei.com>; dmm@ietf.org
> Subject: Re: New Liaison Statement, "CP-173160: New Study Item on User
> Plane Protocol in 5GC"
> 
> 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"
> <arashmid.akhav...@huawei.com>
> 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:sgund...@cisco.com]
> >> Sent: 13 April 2018 12:47
> >> To: Arashmid Akhavain <arashmid.akhav...@huawei.com>; dmm@ietf.org
> >> 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"
> >> <arashmid.akhav...@huawei.com>
> >> wrote:
> >>
> >> >Hi Sri,
> >> >
> >> >Any idea what the plan is once we pass this information to CT4?
> >> >
> >> >Arashmid
> >> >
> >> >> -----Original Message-----
> >> >> From: dmm [mailto:dmm-boun...@ietf.org] On Behalf Of Sri
> >> >> Gundavelli
> >> >> (sgundave)
> >> >> Sent: 12 April 2018 12:47
> >> >> To: dmm@ietf.org
> >> >> 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"
> >> >> <l...@ietf.org>
> >> >> 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 <satoru.matsush...@g.softbank.co.jp>
> >> >> >To: Sri Gundavelli <sgund...@cisco.com>,Dapeng Liu
> >> >> ><maxpass...@gmail.com>
> >> >> >Cc: Dapeng Liu <maxpass...@gmail.com>,Terry Manderson
> >> >> ><terry.mander...@icann.org>,Distributed Mobility Management
> >> >> >Discussion List <dmm@ietf.org>,Sri Gundavelli
> >> >> ><sgund...@cisco.com>,Suresh Krishnan <sur...@kaloom.com>
> Response
> >> Contacts:
> >> >> >georg.mayer.hua...@gmx.com,3gppliai...@etsi.org
> >> >> >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
> >> >> >
> >> >>
> >> >> _______________________________________________
> >> >> dmm mailing list
> >> >> dmm@ietf.org
> >> >> https://www.ietf.org/mailman/listinfo/dmm
> >

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