Re: [netmod] Liaison statement to ORAN

Mahesh Jethanandani <mjethanandani@gmail.com> Wed, 18 November 2020 18:01 UTC

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From: Mahesh Jethanandani <mjethanandani@gmail.com>
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Date: Wed, 18 Nov 2020 10:01:36 -0800
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Cc: "netmod@ietf.org" <netmod@ietf.org>, Robert Petersen <robert.petersen@ericsson.com>, Jacqueline Beaulac S <jacqueline.s.beaulac@ericsson.com>
To: =?utf-8?Q?Bal=C3=A1zs_Lengyel?= <balazs.lengyel=40ericsson.com@dmarc.ietf.org>
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Subject: Re: [netmod] Liaison statement to ORAN
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Hi Balazs,

Do you have an example of where O-RAN is trying to deviate a 3GPP model? I would agree that for O-RAN to deviate a model would be a problem, and that it should be left to vendors to decide if they want to deviate the 3GPP model.

> On Nov 18, 2020, at 12:09 AM, Balázs Lengyel <balazs.lengyel=40ericsson.com@dmarc.ietf.org> wrote:
> 
> Hello,
> In connection to the draft https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01 <https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01> I propose to send a liaison statement from IETF Netmod to ORAN.
>  
> The issue: 3GPP is standardizing a good number of YANG modules as part of the 3gpp TS 28.541 and 28.623 (https://forge.3gpp.org/rep/sa5/MnS/tree/Rel17-draft/yang-models <https://forge.3gpp.org/rep/sa5/MnS/tree/Rel17-draft/yang-models>). 
> ORAN plans to re-use this models, but possibly refine them in some ways. They are considering using deviations to do this. 
> E.g. change config=true schemas node to config=false. This creates problems as documented in https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01#section-5.8.1 <https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01%23section-5.8.1>
>  
> -   Deviations by an SDO (standard defining organization) prevent implementations from reporting their own deviations for the same nodes.
> -   Deviations by an SDO prevent implementations from conforming to the standards specified by both SDOs.
>  
> To avoid these problems I propose to send the following text to ORAN:
>  
> “IETF NETMOD working group requests ORAN to avoid using deviations as part of its specification. As documented in https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01#section-5.8.1 <https://tools.ietf.org/html/draft-ietf-netmod-yang-packages-01%23section-5.8.1> the usage of deviations would prevent:
> Vendors to implement their own deviations for the same YANG schema nodes
> Vendors to claim conformance to both ORAN and 3GPP specifications which are in some cases used as a base for the ORAN YANG models
> Note: These problems with deviations exists even if YANG modules are used without using YANG packages.
> Regards Balazs
>  
> -- 
> Balazs Lengyel                    Senior Specialist                       Ericsson Hungary Ltd. 
> Mobile: +36-70-330-7909              email: Balazs.Lengyel@ericsson.com <mailto:Balazs.Lengyel@ericsson.com>
>  
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Mahesh Jethanandani
mjethanandani@gmail.com