Question: In an MBMS enabled network, what is a key requirement for the Service Announcement (SA) file when delivering Live hybrid DASH/HLS Services to User Equipment (UEs)?
Option 1: The SA file should contain only the Media Presentation Description (MPD) fragment.
Option 2: The SA file must contain both the MPD fragment, the unified MPD Application Service Description (ASD) fragment if referenced, and the HLS master playlist ASD fragment with a specific mimeType attribute.
Option 3: The SA file needs to include only Initialization Segment Description (ISD) fragments for either DASH or HLS, not both.
Option 4: The SA file should be delivered as multiple files, each containing a different type of metadata fragment.
Explanation: For Live hybrid DASH/HLS Services in an MBMS context, the Service Announcement (SA) file must comprehensively support both service types to ensure seamless access for UEs. This requires including the Media Presentation Description (MPD) for DASH services, the unified MPD Application Service Description (ASD) if applicable, and specifically formatted HLS master playlist ASD for HLS services, thereby catering to both client types (DASH and HLS).