**Session Date/Time:** 13 Jan 2026 15:00

# [SCHC](../wg/schc.html)

## Summary

The SCHC Working Group held its first interim meeting of 2026. Key discussions included the progress of several drafts, with a strong focus on moving the RFC 8824 Update and the SCHC Protocol Number drafts towards completion. A Working Group Last Call was decided for the RFC 8824 Update. The new "Chiclet" draft, proposing a modular approach to SHIC functionality, was introduced and will be proposed for Working Group adoption. The group also discussed the status of other drafts and the logistics for IETF 125.

## Key Discussion Points

*   **Welcome and Notewells**: The meeting started with standard IETF notewells and a reminder regarding IPR.
*   **Progress of SCHC Protocol Number Draft (v06)**:
    *   The draft progressed from version 04 to 06, incorporating reviews from Carles, Marco, and Pascal.
    *   A request for a code point for CCSDS at IANA for the "IP extension" was incorporated, with text provided by Marc Blanchet.
    *   Pascal noted the need for more reviews to safely complete the Working Group Last Call (WGLC), specifically mentioning Quentin, Marion, and Laurent.
    *   A significant concern was raised regarding the UDP port number's explanation and justification. Pascal stressed the need for clearer text on its purpose, usage (e.g., in multi-session scenarios, or interaction with multi-point compression), and why it is required for transport layer stakeholders.
    *   Alexander agreed to review the UDP port number section more closely.
*   **Progress of RFC 8824 Update Draft**:
    *   Marco reported a new version (dated December 1st) addresses the two remaining actions from the Montreal meeting.
    *   The authors believe the document is ready for WGLC. Marco also suggested informing the CoRE Working Group due to the document's topic.
    *   The chairs agreed to initiate a WGLC.
    *   The group acknowledged the need to find a shepherd for the document; Carles was suggested, but concerns were raised as he is an author of the draft. No immediate shepherd was identified.
*   **ICMPv6 Compression Document**:
    *   The document has expired.
    *   Action was identified to contact the authors (Laurent and Dominique) to resubmit a new version so that a WGLC can be initiated.
*   **SCHC over PPP Draft**:
    *   The draft is currently on hold, awaiting progression and stability of the main SCHC architectural document to ensure proper alignment, particularly concerning the proposed PPP code for SHIC session indication.
*   **SCHC Architecture Document**:
    *   Reference was made to a "minimum architecture" document by Mario and Quentin (who were not present at this interim).
    *   Discussion was held on how to advance this work, with suggestions for a "tiger team" or "design team" for concentrated effort.
    *   It was noted that there weren't enough participants on the call to make a definitive decision, and the item would be added to the agenda for the next meeting.
*   **IETF 125 (Shenzhen) Participation**:
    *   The chairs inquired about in-person attendance for IETF 125. Most participants indicated they would not be attending in person, with Marco planning to attend online.
    *   The chairs decided to send an email to the working group to formally gauge participation interest for organizing hybrid attendance.
*   **Chiclet Document (New Draft v2)**:
    *   Alexander presented the "Chiclet" document, which now includes Marion and Quentin as co-authors.
    *   **Concept**: Chiclet proposes a formal definition of self-contained, specific SHIC functionality, akin to a "screwdriver" from a "Swiss army knife" – a lightweight, focused part of the full SHIC framework. This concept was motivated by specific needs, such as those from DIA-TSP, for a subset of SHIC functionality.
    *   **Characteristics**: A Chiclet implements a specific SHIC operation, operates with fixed or configurable parameters, and crucially, must be fully interoperable with a full SHIC implementation using its specific configuration.
    *   **Progress**: The draft received positive feedback at IETF 124 in Montreal from industrial participants and a positive review from Quentin on the mailing list.
    *   **Next Steps**: The document is considered straightforward and mature. Alexander suggested it is ready for Working Group adoption. The addition of a YANG definition for Chiclet configuration could be considered if deemed necessary later.
    *   Pascal expressed support for adoption, provided active involvement from Marion and Quentin is confirmed, which Alexander affirmed.

## Decisions and Action Items

**Decisions:**

*   **RFC 8824 Update Draft**: The Working Group will initiate a Working Group Last Call (WGLC) for this document.
*   **Chiclet Draft**: The chairs will initiate a call for Working Group adoption for the "Chiclet" draft on the mailing list.

**Action Items:**

*   **Alexander**:
    *   Initiate the Working Group Last Call for the RFC 8824 Update draft.
    *   Contact the authors of the ICMPv6 Compression document (Laurent and Dominique) to resubmit an updated version.
    *   Review the UDP port number section of the SCHC Protocol Number draft for improved clarity and justification.
*   **Chairs**:
    *   Send an email to the Working Group to assess interest and plans for attending IETF 125 in Shenzhen.
    *   Add the discussion on advancing the SCHC Architecture document (e.g., forming a tiger team) to the agenda for the next interim meeting.
*   **Pascal**:
    *   Initiate the call for Working Group adoption of the "Chiclet" draft on the mailing list.
*   **Working Group**:
    *   Individuals are encouraged to provide further reviews for the SCHC Protocol Number draft, especially regarding the UDP port number justification.

## Next Steps

*   The chairs will proceed with the action items, including initiating WGLCs and calls for adoption as decided.
*   The group looks forward to increased participation at the next interim meeting.