scope:

The present document covers the study of interactivity support for 3GPP-based streaming and download services, in the context of services delivery over MBMS and PSS. Topical areas addressed include the following:

- Use cases and associated assumptions, recommended requirements and gap analyses on the operation of and means to support interactivity capabilities in streaming and download services.

- End-to-end architecture and functional component models, with emphasis on unicast and broadcast DASH services.

- Differentiation between application/presentation level and transport/service layer functions in support of interactive services.

- Overview of service interactivity mechanisms in terrestrial broadcast TV services, as defined in DVB and ATSC specifications.

- Notification mechanisms to activate interactive events, either pre-scheduled or to occur dynamically and unpredictably, at precise times during consumption of a main service or program.

- Functional gaps in current MBMS and PSS application/service layer specifications to support desired interactivity functions.

- Measurement and reporting of the consumption of interactive features.