Scope & Architectures Project Roadmap Features GitHub Repos Releases Tutorials Requirements

Features under implementation

MBS development over Open5GS

The 5G-MAG Reference Tools for MBS currently target:

MBS Session provisioning in the MB-SMF (e.g. by an MBSF) via reference point Nmb1.
Direct multicast data ingest by the MB-UPF from an AF/AS via reference point N6mb.
Shared delivery of multicast packets from the MB-UPF via individual GTP-U tunnels to one or more gNodeBs in the 5G Core.
Point-to-Multipoint (PTM) delivery of multicast packets from a gNodeB to UEs via the RAN.

The 5G-MAG Reference Tools for MBS User Services add the following functionality:

MBSTF Distribution Session management (e.g. by an MBSF) via reference point Nmb2.
Ingest of objects by the MBSTF from the MBS Application Provider (AF/AS) via reference point Nmb8, using either a pull- or push-based object acquisition method.
Delivery of ingested objects in a FLUTE Session multicast sent as multicast ALC packets from an MBSTF to an MB-UPF via a reference point Nmb9 unicast tunnel.

The following features are supported:

MB-SMF TMGI Service API (Following 3GPP TS 29.532 V17.4.0)
- TMGI Allocate Service operation
- TMGI Deallocate Service operation
MB-SMF MBS Session Service API (Following 3GPP TS 29.532 - Release 17.4.0)
- MBS Session Create Service operation
- MBS Session Release Service operation
MB-SMF PFCP Session Establishment extensions (Following 3GPP TS 29.244 - Release 17.9.0)
- PFCP Session Establishment Request extensions
MB-UPF PFCP Session Establishment extensions (Following 3GPP TS 29.244 - Release 17.9.0)
- PFCP Session Establishment Response extensions
Multicast/Broadcast Service Transport Services (MBSTF) (Following 3GPP TS 29.581 V18.5.0)
- Object distribution method
  - Single shot operating mode: Individual objects are sent once in a FLUTE Session by the MBSTF
    - Pull-based object acquisition (MBSTF pulls objects from a media server)
    - Push-based object acquisition (objects are pushed into the MBSTF)
  - Streaming operating mode: Objects are scheduled and sent in real time according to a presentation manifest, such as a DASH MPD.
    - Pull-based object acquisition (MBSTF pulls a Service Entry Point object, such as a presentation manifest, and then schedules the pulling of further objects, such as media segments and updates of the presentation manifest)
    - Push-based object acquisition (MBSTF waits for a Service Entry Point object, such as a presentation manifest, to be pushed to it, and then schedules the pulling of media segment objects)
    - For this operating mode, the supported Service Entry Point formats are:
      - MPEG-DASH MPD (live profile only).

The following features are not yet supported:

AMF MBS Broadcast Service API (Following 3GPP TS 29.518 V17.11.0)
- MBS Broadcast ContextCreate Service operation
- MBS Broadcast ContextRelease Service operation
AMF NGAP extensions (Following 3GPP TS 38.413 - Release 17.6.0)
- BROADCAST SESSION SETUP REQUEST
gNB NGAP extensions (Following 3GPP TS 38.413 - Release 17.6.0)
- BROADCAST SESSION SETUP RESPONSE
NRF NFDiscovery Service API extensions (Following 3GPP TS 29.510 - Release 17.11.0)
- MB-SMF TMGI Service API extensions
- MB-SMF MBS Session Service API extensions
- AMF MBS Broadcast Service API extensions
MBSTF Distribution Session management (Following 3GPP TS 29.581 V18.5.0)
- Packet distribution method
  - Use direct multicast packet ingest by the MB-UPF at reference point N6mb instead for now.
- Object distribution method
  - Collection operating mode: One or more objects described by a simple manifest are sent once in the FLUTE Session.
  - Carousel operating mode: One or more objects described by a simple manifest are repeatedly sent in the FLUTE Session according to a schedule.
  - Streaming operating mode: Objects are sent in a FLUTE Session in real time according to a schedule specified in a streaming presentation manifest.
    - Presentation manifest types other than MPEG-DASH MPD (live profile).
- Status notification subscription