S4-260034 - AI Summary

[5MBUSA] MBSF notification event corrections

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Change Request Summary: 26.502 CR 0046 Rev 1

Document Information

  • CR Number: 0046 Rev 1
  • Release: Rel-17
  • Category: F (Correction)
  • Work Item: 5MBUSA
  • Title: [5MBUSA] MBSF notification event corrections

Reason for Change

This CR addresses two main issues:

  1. Misalignment between Stage-2 and Stage-3 specifications: Two notification events specified by CT3 in TS 29.580 are not properly motivated at stage-2 in TS 26.502

  2. Reference: https://github.com/5G-MAG/rt-mbs-function/issues/11

  3. Errors in notification event depiction: Figure 5.3-2 contains errors in the depiction of event notifications

  4. Reference: https://github.com/5G-MAG/Standards/issues/188

Technical Changes

Change 1: Clause 4.6.2 - Notification Events Table

Modifications to Table 4.6.2-1:

  • Column simplification: The final column "Applicable reference point(s)" has been renamed to "Stimulating reference point(s)" for improved clarity
  • Clarification of event origins: The text now better explains that events in brackets originate from other NFs, while events without brackets originate from the MBSF itself

Addition of two missing notification events:

  1. Distribution Session service management failure
  2. Description: The MBS Distribution Session could not be started because necessary resources could not be allocated by the MBS System

  3. Stimulating reference points: (Nmb1), (Nmb2), Nmb10/Nmb5

  4. Distribution Session policy control failure

  5. Description: The MBS Distribution Session could not be started because of a policy authorization/control failure or rejection
  6. Stimulating reference points: (Nmb12), Nmb10/Nmb5

Change 2: Clause 5.3 - Procedure Corrections in Figure 5.3-2

Step 14 correction:
- Changed service operation from generic notification to Nmbstf_MBSDistributionSession_StatusNotify callback service operation
- Clarified that this informs the MBSF of (un)successful establishment of content ingest using the Distribution Session established event
- Added state transition information: On success → ESTABLISHED, on failure → remains INACTIVE

Step 15 correction:
- Changed service operation to Nmbsf_MBSUserDataIngestSession_StatusNotify callback service operation
- Clarified that this informs the MBS Application Provider of (un)successful establishment of content ingest
- Specified use of either Distribution Session established event or Distribution Session establishment failure event, as appropriate

Step 17 correction:
- Changed service operation to Nmbsf_MBSUserDataIngestSession_StatusNotify callback service operation
- Clarified that this informs the MBS Application Provider of (un)successful establishment of all MBS Distribution Sessions
- Specified use of either User Data Ingest Session established event or User data ingest failure event, as appropriate

Impact

  • Alignment achieved: TS 26.502 (SA4) now properly aligns with TS 29.580 (CT3)
  • Implementation clarity: The MBSF can now be implemented correctly according to the specification
  • No impact on TS 29.580: Changes are confined to TS 26.502
Document Information
TDoc:
S4-260034
Source:
BBC
Type:
CR
For:
Agreement
Original Document:
View on 3GPP
Title: [5MBUSA] MBSF notification event corrections
Agenda item: 8.4
Agenda item description: Release 19 and earlier matters
Doc type: CR
For action: Agreement
Abstract: Content already agreed at SWG level. Some of the notifications in the high-level procedures are incorrect.
Secretary remarks: Source modified on 2/3/2026. Original source : BBC
Release: Rel-17
Specification: 26.502
Version: 17.10.0
Related WIs: 5MBUSA
CR number: 46.0
CR revision: 1.0
CR category: F
TSG CR pack: SP-260117
Clauses affected: 4.6.2, 5.3
CN: True
CR: 46.0
Spec: 26.502
Contact: Richard Bradbury
Uploaded: 2026-02-03T15:15:29.143000
Contact ID: 82569
TDoc Status: agreed
TSG CR Pack: SP-260117
Is revision of: S4aI260006
Clauses Affected: 4.6.2, 5.3
Reservation date: 29/01/2026 16:58:48
Secretary Remarks: Source modified on 2/3/2026. Original source : BBC
Agenda item sort order: 28