A.5 MBSF/MBSTF-like functions in External DN

26.5023GPP5G Multicast-Broadcast User Service ArchitectureRelease 17TS

Figure A.5-1 depicts a transport-only deployment in which the MBS Application Provider (AF/AS) hosts an "MBSF-like" function that mimics the MBSF at reference point MBS-5 and an "MBSTF-like" function that mimics the MBSTF at reference point MBS-4-MC. The "MBSF-like", "MBSTF-like" and "MBS AS-like" functions produce data streams which are compliant with the present document. Although the 5G System sets up a Transport-only Mode (see configuration option 1 in annex A of TS 23.247 [5]), the MBS Client in the UE follows the procedures defined in the present document.

1. The MBSF-like function provisions MBS Services in the MB‑SMF via the Nnef service at reference point N33.

2 The MBS Application Provider (AF/AS) uses an MBSTF-like function to produce packet data compliant with reference point MBS‑4‑MC. The packets are injected directly into the MB-UPF at reference point N6mb (not shown).

3. An MBS Application Provider (AF/AS) in an External DN uses an MBSF-like function to generate a Service Announcement for MBS User Services.

4. The MBS Application Provider (AF/AS) makes object repair available from an MBS AS-like function that is compliant with reference point MBS‑4‑UC.

NOTE: Italic type is used to annotate service-based interfaces.

Figure A.5-1: Deployment with MBSF/MBSTF-like functions in External DN

Annex B (informative):
Nmb8 User Plane ingest examples