4.4 Reference points and interfaces

26.5023GPP5G Multicast-Broadcast User Service ArchitectureRelease 17TS

4.4.1 Overview

The following reference points defined in clause 5.1 of TS 23.247 [5] are relevant to MBS User Services architecture: Nmb1, Nmb2, Nmb5, Nmb8, Nmb9, Nmb10 and Nmb12.

The following additional reference points are defined by the present document:

– MBS-4-MC: Unidirectional multicast distribution of content from the MBSTF to the MBS Client.

– MBS-4-UC: File-based unicast repair between the MBS Client and the MBS AS.

– MBS-5: Interactions between the MBS Client and the MBSF for the purpose of MBS control plane and service handling.

– MBS-6: API exposed by the MBS Client and used by the MBS-Aware Application to manage and control MBS User Services.

– MBS-7: API exposed by the MBS Client and used by the MBS-Aware Application to receive user data information distributed using MBS User Services.

– MBS-8: Announcement of MBS User Services to the MBS-Aware Application by the MBS Application Provider.

In addition, the following reference points are defined inside the MBS Client function:

– MBS‑6′: API exposed by the MBSTF Client and used by the MBSF Client to (de)activate reception of an MBS Session by the MBSTF. The reception parameters are supplied by the MBSF Client.

This reference point is outside the scope of MBS User Services and is not described further in the present document.

– MBS‑7′: API exposed by the MSTF Client and used by the MBSTF to supply MBS Session configuration information that has been received from reference point MBS‑4‑MC.

This reference point is outside the scope of MBS User Services and is not described further in the present document.