# Document Shepherd Write-Up for Group Documents
* This version is dated 4 July 2022.*
Thank you for your service as a document shepherd. Among the responsibilities is
answering the questions in this write-up to give helpful context to Last Call
and Internet Engineering Steering Group ([IESG][1]) reviewers, and your
diligence in completing it is appreciated. The full role of the shepherd is
further described in [RFC 4858][2]. You will need the cooperation of the authors
and editors to complete these checks.
Note that some numbered items contain multiple related questions; please be sure
to answer all of them.
Technical Summary:
This document describes the use of SCHC (Static context Header Compression)
compression and fragmentation rules for RFC 8724 and RFC 8824 over the SIGFOX
technology.
Working Group Summary:
This document was discussed at several LPWAN interim meetings. There was never
any form of opposition against it. This I-D uses the new compound-ack fragmentation
mode described in a new doc.
Shepherd: Ana Minaburo
Responsible Area Director: Eric Vyncke
## Document History
1. Does the working group (WG) consensus represent the strong concurrence of a
few individuals, with others being silent, or did it reach broad agreement?
It's more of the latter. Sigfox solution has been developed by a group
of 5-6 people very active people who implement open source code and proprietary
stacks for SCHC. The group has accepted the solution they bring in this I-D.
2. Was there controversy about particular points, or were there decisions where
the consensus was particularly rough?
There was a global approval. Discussion centered on two slight issues:
First, the first version of this document included the description of a new
fragmentation mode and the use of SCHC compression and fragmentation over
SigFox technology. The group decided to split this I-D into two documents.
Thereby today, the group works on the draft-ietf-lpwan-schc-over-sigfox and
draft-ietf-lpwan-schc-compound-ack.
The second issue is the non-use of DTag over SIGFOX technology. The RFC8724
does not forbid this possibility, so it should not matter.
But the DTag size (T) indicates interleaving and might be supported or not.
The non-use of DTag means that there is only one SCHC packet on the air
at a time, you must wait until the inactivity timer to send another packet.
3. Has anyone threatened an appeal or otherwise indicated extreme discontent? If
so, please summarize the areas of conflict in separate email messages to the
responsible Area Director. (It should be in a separate email because this
questionnaire is publicly available.)
No
4. For protocol documents, are there existing implementations of the contents of
the document? Have a significant number of potential implementers indicated
plans to implement? Are any existing implementations reported somewhere,
either in the document itself (as [RFC 7942][3] recommends) or elsewhere
(where)?
The newest implementation is under “The SCHC over Sigfox Project.”
in github (https://github.com/schc-over-sigfox).
Also, there are some based implementations in:
Server code:
https://github.com/saguilarDevel/schc-sigfox
Device code (LoPy4):
https://github.com/saguilarDevel/schcFox
Furthermore, a simulator can be found here:
https://github.com/wituwitu/WySCHC
## Additional Reviews
5. Do the contents of this document closely interact with technologies in other
IETF working groups or external organizations, and would it therefore benefit
from their review? Have those reviews occurred? If yes, describe which
reviews took place.
No such thing
6. Describe how the document meets any required formal expert review criteria,
such as the MIB Doctor, YANG Doctor, media type, and URI type reviews.
Do not apply
7. If the document contains a YANG module, has the final version of the module
been checked with any of the [recommended validation tools][4] for syntax and
formatting validation? If there are any resulting errors or warnings, what is
the justification for not fixing them at this time? Does the YANG module
comply with the Network Management Datastore Architecture (NMDA) as specified
in [RFC 8342][5]?
No such thing
8. Describe reviews and automated checks performed to validate sections of the
final version of the document written in a formal language, such as XML code,
BNF rules, MIB definitions, CBOR's CDDL, etc.
No such thing
## Document Shepherd Checks
9. Based on the shepherd's review of the document, is it their opinion that this
document is needed, clearly written, complete, correctly designed, and ready
to be handed off to the responsible Area Director?
Certainly.
10. Several IETF Areas have assembled [lists of common issues that their
reviewers encounter][6]. For which areas have such issues been identified
and addressed? For which does this still need to happen in subsequent
reviews?
I could not find one relevant here.
11. What type of RFC publication is being requested on the IETF stream ([Best
Current Practice][12], [Proposed Standard, Internet Standard][13],
[Informational, Experimental or Historic][14])? Why is this the proper type
of RFC? Do all Datatracker state attributes correctly reflect this intent?
Proposed Standard, to ensure interoperation among implementations. Datatracker state
attributes are correct.
12. Have reasonable efforts been made to remind all authors of the intellectual
property rights (IPR) disclosure obligations described in [BCP 79][7]? To
the best of your knowledge, have all required disclosures been filed? If
not, explain why. If yes, summarize any relevant discussion, including links
to publicly-available messages when applicable.
Yes, and there's no IPR against this document.
13. Has each author, editor, and contributor shown their willingness to be
listed as such? If the total number of authors and editors on the front page
is greater than five, please provide a justification.
There are seven authors, most of them from Academia.
14. Document any remaining I-D nits in this document. Simply running the [idnits
tool][8] is not enough; please review the ["Content Guidelines" on
authors.ietf.org][15]. (Also note that the current idnits tool generates
some incorrect warnings; a rewrite is underway.)
All is good now.
15. Should any informative references be normative or vice-versa? See the [IESG
Statement on Normative and Informative References][16].
All good.
16. List any normative references that are not freely available to anyone. Did
the community have sufficient access to review any such normative
references?
None.
17. Are there any normative downward references (see [RFC 3967][9] and [BCP
97][10]) that are not already listed in the [DOWNREF registry][17]? If so,
list them.
None.
18. Are there normative references to documents that are not ready to be
submitted to the IESG for publication or are otherwise in an unclear state?
If so, what is the plan for their completion?
Yes, as the initial I-D had been split, it refers to the second
document: draft-ietf-lpwan-schc-compound-ack.
The draft-ietf-lpwan-schc-compound-ack document is in last call at the WG.
19. Will publication of this document change the status of any existing RFCs? If
so, does the Datatracker metadata correctly reflect this and are those RFCs
listed on the title page, in the abstract, and discussed in the
introduction? If not, explain why and point to the part of the document
where the relationship of this document to these other RFCs is discussed.
No.
20. Describe the document shepherd's review of the IANA considerations section,
especially with regard to its consistency with the body of the document.
Confirm that all aspects of the document requiring IANA assignments are
associated with the appropriate reservations in IANA registries. Confirm
that any referenced IANA registries have been clearly identified. Confirm
that each newly created IANA registry specifies its initial contents,
allocations procedures, and a reasonable name (see [RFC 8126][11]).
No IANA considerations; this specification describes how to use SCHC over
Sigfox. It does not have new functionalities or formats.
21. List any new IANA registries that require Designated Expert Review for
future allocations. Are the instructions to the Designated Expert clear?
Please include suggestions of designated experts, if appropriate.
None.
[1]: https://www.ietf.org/about/groups/iesg/
[2]: https://www.rfc-editor.org/rfc/rfc4858.html
[3]: https://www.rfc-editor.org/rfc/rfc7942.html
[4]: https://trac.ietf.org/trac/ops/wiki/yang-review-tools
[5]: https://www.rfc-editor.org/rfc/rfc8342.html
[6]: https://trac.ietf.org/trac/iesg/wiki/ExpertTopics
[7]: https://www.rfc-editor.org/info/bcp79
[8]: https://www.ietf.org/tools/idnits/
[9]: https://www.rfc-editor.org/rfc/rfc3967.html
[10]: https://www.rfc-editor.org/info/bcp97
[11]: https://www.rfc-editor.org/rfc/rfc8126.html
[12]: https://www.rfc-editor.org/rfc/rfc2026.html#section-5
[13]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.1
[14]: https://www.rfc-editor.org/rfc/rfc2026.html#section-4.2
[15]: https://authors.ietf.org/en/content-guidelines-overview
[16]: https://www.ietf.org/about/groups/iesg/statements/normative-informative-references/
[17]: https://datatracker.ietf.org/doc/downref/