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

"Pablo Camarillo (pcamaril)" <pcamaril@cisco.com> Tue, 27 July 2021 18:36 UTC

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From: "Pablo Camarillo (pcamaril)" <pcamaril@cisco.com>
To: David Allan I <david.i.allan=40ericsson.com@dmarc.ietf.org>
CC: "dmm@ietf.org" <dmm@ietf.org>
Thread-Topic: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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Subject: Re: [DMM] Additional questions/comments on draft-ietf-dmm-srv6-mobile-uplane-13
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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?

-  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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