Uplink media streaming functional entities in the 5GMS System include the 5GMSu Application Provider, 5GMSu AF, 5GMSu AS and the UE. To make use of these other entities, the UE includes a 5GMSu-Aware Application that is provided by the 5GMSu Application Provider and a 5GMSu Client comprising the Media Session Handler and the Media Streamer. The M1 Provisioning API enables the 5GMSu Application Provider to establish and manage the uplink media session handling and streaming options of the 5GMSu System. The content egest interface at reference point M2u enables uplink media streaming content that has been sent by the 5GMSu Client to the 5GMSu AS at reference point M4u to be subsequently delivered to the 5GMSu Application Provider. Uplink media streaming media transfer from the 5GMSu AS to the 5GMSu Application Provider may be either pull-based and initiated by the 5GMSu Application Provider using the HTTP GET method, or push-based and initiated by the 5GMSu AS using the HTTP PUT method. The 5GMSu Application Provider's target endpoint for push-based streaming content delivery at reference point M2u is provided to the 5GMSu AF as part of the M1 Provisioning Session and this is passed to the 5GMSu AS as part of the M3u configuration procedures. The 5GMSu AF, having been successfully provisioned at reference point M1u, sets up corresponding resources at a reference point M5u endpoint from which Service Access Information for uplink media streaming session management, metrics reporting, network assistance and request for policy and/or charging treatment may be retrieved using its provisioned external application identifier. Certain types of configuration and policy information accessed over reference point M5u by the Media Session Handler, such as uplink metrics reporting, QoS policy, or support for AF-based network assistance are further passed to the Media Streamer via the M7u API. The 5GMSu-Aware Application initiates a new uplink media streaming session by launching the Media Stream Handler at reference point M6u using a 3GPP Service URL for 5GMS (see clause 4.8.3). The 3GPP Service URL indicates the external application identifier. This may be used to retrieve Service Access Information from the 5GMSu AF at reference point M5. Alternatively, if the 5GMSu-Aware Application has already acquired all necessary Service Access Information via private means at reference point M8, this may be supplied directly to the Media Session Handler at reference point M6u as additional parameters. Based on a request from the 5GMSu-Aware Application or from the Media Streamer received over the M6u API, and based on the Service Access Information acquired from the 5GMSu AF via reference point M5u, the Media Session Handler sets up an uplink media streaming session with a unique media delivery session identifier. Upon successful session establishment, the Media Session Handler triggers the Media Streamer to begin uplink media streaming of media content to the 5GMSu AS over reference point M4u. Subscription to status and other event notification services is offered by the Media Session Handler to the 5GMSu-Aware Application and to the Media Streamer via the UE media session handling APIs exposed by the Media Session Handler at reference point M6u. Subscription to status and other event notification services is also offered by the Media Streamer to the 5GMSu-Aware Application and to the Media Session Handler via the UE media stream handling APIs exposed by the Media Player at reference point M11u.

Table 5.2-1 summarises the APIs used to provision and use the various uplink media streaming features specified in TS 26.501.