Content for  TS 26.501  Word version:  18.6.0

This clause addresses cases for which a 5GMS service is available on MBS and at the same time on unicast. The service on unicast may be richer and extended and may provide additional user experiences. It is assumed that the content is statically provisioned on either MBS or on unicast. Services addressed in this clause predominantly refer to the case for which the delivery manifest differentiates between resources accessible via unicast downlink media streaming at reference point M4d and resources accessible through MBS, in this case through MBS-API-U. These resources are differentiated in the delivery manifest through different Data Networks, for example different Base URLs in DASH MPDs, or in HLS by providing different pathways. The 5GMSd Client, in particular the Media Player in collaboration with the Media Session Handler and the MBS Client, dynamically selects the delivery network from which to acquire media content according to reception conditions, user preferences or other policies. Content is provisioned such that the 5GMSd Client is able to provide a seamless user experience when switching between different delivery networks. The call flow in Figure 5.12.4-1, Figure 5.12.4-2 and Figure 5.12.4-3 extends that defined in clause 5.6.1 to address generic hybrid use cases. Specific additional use cases are presented in the remainder of clause 5.12.4.

Steps:

Steps 13-20 are repeated according to the Media Player Entry information.

In a specific 5GMS content delivery via 5G System and MBS cenario, an interactive service may be provided via 5GMS while the main media content resources are delivered via MBS exclusively. In this case, the following instantiations apply:

• In step 2, the Media Entry Point document (e.g. MPD) only points to content in the local proxy Media Server.
• Step 13 as well as steps 17-20 are all terminated on the local proxy Media Server.

In a specific 5GMS content delivery via 5G System and MBS scenario, the service is made available via both 5GMS and MBS delivery networks, but only one Representation of each Adaptation Set is provided via MBS. In this case, the following instantiations apply:

• In step 2, one Representation of each Adaptation Set is distributed via MBS.
• As long as the streaming service is accessible over MBS, the Media Player selects the media content in step 13 as well as steps 17-20 from the local proxy Media Server; content is not available from the 5GMSd AS.
• If the streaming service becomes unavailable via MBS, the Media Player switches to accessing the media content in step 13 as well as steps 17-20 from the 5GMSd AS.
• Once the streaming service becomes available again via MBS, the Media Player switches back to accessing the media content in step 13 as well as steps 17-20 from the local proxy Media Server.

In a specific 5GMS content delivery via 5G System and MBS scenario, the service is made available via both 5GMS and MBS delivery networks, but only one Representation of each Adaptation Set is provided via MBS. The content is retained by the 5GMSd AS for a period of time to support time shifted access. In this case, the following instantiations apply:

• In step 2, one Representation is of each Adaptation Set is distributed via MBS.
• If the streaming service is accessible via MBS and the user is consuming content at the live edge, the Media Player selects the media content in the step 13 as well as steps 17-20 from the local proxy Media Server; content is not available from the 5GMSd AS.
• If the user switches to time-shift viewing mode or streaming service becomes unavailable via MBS, the Media Player switches to accessing the media content in the step 13 as well as steps 17-20 from the 5GMSd AS.
• Once the streaming service becomes available again via MBS and the user returns to the live edge, the Media Player switches back to accessing the media content in the step 13 as well as steps 17-20 from the local proxy Media Server.

In a specific 5GMS content delivery via 5G System and MBS scenario, the service is made available via both 5GMS and MBS delivery networks, but only one Representation of selected Adaptation Sets is provided via MBS. Some Adaptation Sets are only available via 5GMS. In another case, two or more content alternatives may exist for a period of time, but only one alternative is provided over MBS. In this case, the following instantiations apply:

• In step 2, the MPD is generated to define the different content alternatives.
• If the streaming service is accessible over MBS and the user watches content available on broadcast, the Media Player selects the media content in step 13 as well as steps 17-20 from the local proxy Media Server; content is not available from the 5GMSd AS.
• If the user switches content or content components, the Media Player switches to accessing the media content in the step 13 as well as steps 17-20 from the 5GMSd AS. If only a component is replaced, the Media Player accesses media content from the local proxy Media Server and the 5GMSd AS at the same time.