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Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13

Sridhar Bhaskaran <sridhar.bhaskaran@gmail.com> Wed, 28 July 2021 13:34 UTC

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From: Sridhar Bhaskaran <sridhar.bhaskaran@gmail.com>
Date: Wed, 28 Jul 2021 19:03:55 +0530
Message-ID: <CA+3a8ObT1WV3Z+PSoPTEM2SAqNQZbdZCBJ42Zr_7gyv_JcxcQQ@mail.gmail.com>
To: "Pablo Camarillo (pcamaril)" <pcamaril=40cisco.com@dmarc.ietf.org>
Cc: David Allan I <david.i.allan=40ericsson.com@dmarc.ietf.org>, "dmm@ietf.org" <dmm@ietf.org>
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Hi Pablo / Dave all,

See my additional comment inline marked [SB]

Regards
Sridhar

On Wed, Jul 28, 2021 at 12:06 AM Pablo Camarillo (pcamaril) <pcamaril=
40cisco.com@dmarc.ietf.org> wrote:

> Hi Dave,
>
> Many thanks for your comments. Inline with PC.
>
> Cheers,
> Pablo.
>
> -----Original Message-----
> From: dmm <dmm-bounces@ietf.org> On Behalf Of David Allan I
> Sent: viernes, 23 de julio de 2021 19:51
> To: dmm@ietf.org
> Subject: Re: [DMM] Additional questions/comments on
> draft-ietf-dmm-srv6-mobile-uplane-13
>
> Hi:
>
> Looking over this draft it strikes me that IF you are discussing a GTP
> replacement, there are a few unaddressed gaps...or at least I see no
> mention of them.
>
> -  adding X2 to the list of interfaces to be supported
> [PC] Do you think there is any new mechanism to be added to the currently
> defined ones?
>
> [SB] If we are including X2 then F1U also needs to be considered. Both X2
and F1U also have GTPU flow control mechanism defined in TS 38.425. I am
not sure if a corresponding feedback mechanism exists in SRv6 for flow
control.

-  support for end-marker for handoff stream synchronization (probably
> could fit the unused bit in Args.Mob.Session but frankly I have not studied
> this in detail)
> [PC] User Plane Message encoding is out of the scope of this draft.
> However, draft-murakami-dmm-user-plane-message-encoding-03 proposes a
> mechanism to encode the Echo Request, Echo Reply, Error Indication, and End
> Marker.
>
> -  support for QMP (quality measurement protocol), which I believe needs
> to also extend across the radio interface so is not simply local to the GTP
> domain and can be "stunt doubled"
> [PC] Excellent point. Seems we missed this one in draft-murakami! We can
> add in there the QoS Monitoring Packet indicator, as well as the encoding
> for the timestamps and average DL/UL delays.
>
> -  support for paging policy presence/indication
> [PC] Same as previous. Many thanks.
>
> [PC], By the way, I've posted an updated revision as the reference to
> draft-murakami was missing.
>
> If this has come up elsewhere, let me know
>
> Cheers
> Dave
>
>
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