This procedure describes the establishment of a unicast downlink media streaming session with 5GMSd AF interactions for dynamic policy updates. A streaming session may use 3GP File Format (Progressive Download), 3GP Timed Text or other (potentially non-3GPP defined) formats.
The 5GMSd Application Provider has provisioned the 5G Media Streaming System and has set up content ingest.
The 5GMSd-Aware Application has received the Service Announcement from the 5GMSd Application Provider.
The Service Access Information contains detailed information for the policy related interactions. Specifically, the information includes URL(s) for the 5GMSd AF, an identifier of the 5GMS Provisioning Session and a list of authorized Policy Type indications for that specific application.
The 5GMSd Application Provider has agreed an SLA with the Network Operator defining the possible QoS levels and their charging rates (see TS 23.503, clause 220.127.116.11). The PCF is configured with the corresponding QoS parameters and charging information.
The 5GMSd-Aware Application triggers the Service Announcement and Content Discovery procedure. The Service Announcement includes either the whole Service Access Information (i.e. details for Media Session Handling (M5d) and for Media Streaming access (M4d)) or a reference to the Service Access Information. The configuration parameters are listed in Table 5.7.4-1.
When the 5GMSd-Aware Application has received a reference to the Service Access Information (see step 1), the Media Session Handler interacts with the 5GMSd AF to acquire the whole Service Access Information.
The Media Player notifies the Media Session Handler about the Service Data Flow Description(s) of the transport session established in the previous step (see TS 23.502), as defined in the Service Access Information. This can be for example 5-tuples.
The Media Session Handler requests that a dynamic policy be applied to the media session. The request includes at least the Provisioning Session identifier, the Service Data Flow Description(s) and the Policy Template identifier (see Table 5.7.4-1) to be applied to the described transport session. In some cases, a QoS specification is also provided, containing desired QoS information. The 5GMSd AF uses the Policy Template indication for the related procedure and to identify the related network function.
When the Policy Template relates to a different charging scheme, the 5GMSd AF may use the Nnef_ChargeableParty service as defined in TS 23.502, clause 18.104.22.168. (The complete call flow is described in TS 23.502, clause 22.214.171.124 and clause 126.96.36.199.) The Policy Template may contain the Sponsor Information (values, based on SLA negotiation) and Background Data Transfer Reference ID. The Flow description is provided by the Media Session Handler at API invocation.
The Media Session Handler queries the status of the dynamic policy invocation. The response contains status information (policy accepted, rejected, etc) and information on policy enforcement such as the enforcement method and enforcement bit rate.
The Media Player receives the initialization information of the progressive download content. The initialization information contains configuration parameters for reception of the media, and optionally also DRM information.