S4-260525 - AI Summary

[FS_Q4RTC_MED] Pseudo-CR on Annex for MOQT session setup and media delivery models

Back to Agenda Download Summary
AI-Generated Summary AI

Summary: S4-260525 – Pseudo-CR on Annex for MOQT Session Setup and Media Delivery Models

Source: NTT | Spec: 3GPP TR 26.836 v0.1.1 | WI: FS_Q4RTC_MED | For: Agreement

Purpose

Contributes informative annex content to TR 26.836 to support evaluation of Media over QUIC Transport (MOQT) for RTC application scenarios, as part of the FS_Q4RTC_MED study item.

Changes Proposed

References section update:
- Updates reference [18] (draft-ietf-moq-transport) from draft-16 to draft-17 / March 2026 version.

New Annex A (Informative): MOQT Session Setup and Media Delivery Models

  • A.2 – MOQT Session: Describes the MOQT session structure over native QUIC or WebTransport, covering use of unidirectional control streams (SETUP, GOAWAY), bidirectional request streams (SUBSCRIBE, PUBLISH, FETCH, etc.), and datagrams/streams for object delivery. Covers session setup (SETUP message exchange) and termination (CONNECTION_CLOSE for native QUIC; CLOSE_WEBTRANSPORT_SESSION for WebTransport).

  • A.3 – Media Delivery Models and Call Flows: Defines two models:

  • E2E unidirectional delivery without Relay – direct publisher-to-subscriber flow including namespace discovery (SUBSCRIBE_NAMESPACE, PUBLISH_NAMESPACE, or out-of-band), catalog track subscription (subscriber- or publisher-initiated via SUBSCRIBE/PUBLISH messages), media track subscription, and subscription termination (STOP_SENDING or PUBLISH_DONE).

  • Unidirectional delivery for multiple subscribers using Relay – referenced but call flow detail not included in this contribution.

  • Call flows assume use of MOQT Streaming Format (MSF) (draft-ietf-moq-msf) for catalog-based track discovery.

Notes

  • Contains minor editorial errors in the draft text (e.g., "PUPBLISH_OK", "publisehr", inconsistent step numbering) that would need correction before agreement.
  • Relay model (A.3.3) is referenced but not yet populated in this contribution.
Document Information
TDoc:
S4-260525
Source:
NTT
Type:
pCR
For:
Agreement
Original Document:
View on 3GPP
Title: [FS_Q4RTC_MED] Pseudo-CR on Annex for MOQT session setup and media delivery models
Agenda item: 10.7
Agenda item description: FS_Q4RTC_MED (Study on QUIC-based Media Delivery for Real-time Communication)
Doc type: pCR
For action: Agreement
Release: Rel-20
Specification: 26.836
Version: 0.1.1
Related WIs: FS_Q4RTC_MED
Spec: 26.836
Contact: Yoshihiro Inoue
Uploaded: 2026-04-07T07:10:15.777000
Contact ID: 44190
TDoc Status: available
Is revision of: S4aR260016
Reservation date: 06/04/2026 07:18:16
Agenda item sort order: 52