This document specifies protocols used for delivery and synchronization of media and non-timed data in the ATSC 3.0 system. A/331 specifies the technical mechanisms and procedures pertaining to service signaling and IP-based delivery of a variety of ATSC 3.0 services and contents to ATSC 3.0-capable receivers over broadcast, broadband, and hybrid broadcast/broadband networks. The service signaling functionality defines the data formats and information components necessary to discover and acquire user services. The IP-based delivery functionality specifies two application transport protocols for the carriage of media content and service signaling data over broadcast and/or broadband networks to receivers. The delivery functionality also includes mechanisms for the synchronization of media components delivered on the same or different transport networks, and application-layer forward error correction methods that enable error-free reception and consumption of media streams or discrete file objects. A component of this standard is the accompanying schema.
There are multiple versions of this document. Please be sure to download the desired version. For amendments, the text includes a list of changes, the rationale for the changes, and compatibility considerations.
Download A/331:2019, “Signaling, Delivery, Synchronization, and Error Protection”, and accompanying schema, approved 20 June 2019. This version is referenced by A/300:2019.
Download A/331:2019 Amendment No. 1, “MMT Hybrid Delivery”, approved 6 January 2020.
Download A/331:2019 Amendment No. 2, “Fix Daylight Saving”, approved 16 January 2020.
Download A/331:2019 Amendment No. 3, “ServiceId URL and BSID-PLP Mapping”, approved 26 December 2019.
Download A/331:2019 Amendment No. 4, “User Agent String”, approved 15 January 2020.
Download A/331:2019 Amendment No. 5, “Fix RRT”, approved 30 December 2019.
Download A/331:2019 Amendment No. 6, “Simulcast TSID”, approved 31 December 2019.
Download A/331:2019 Amendment No. 7, “DRM System ID”, approved 3 January 2020.
Download A/331:2019 Amendment No. 8, “Uniqueness of @serviceID”, approved 1 January 2020.
Download A/331:2019 Amendment No. 9, “Fix Keep Screen Clear”, approved 2 January 2020.
Download A/331:2020, “Signaling, Delivery, Synchronization, and Error Protection”, 16 January 2020. This document is a rollup of Amendments No. 1 through 9 to A/331:2019. The accompanying schema (unchanged from A/331:2019) can be downloaded from the above link. This version is referenced by A/300:2020.
Download A/331:2020, “Signaling, Delivery, Synchronization, and Error Protection with Amendment No. 1”. This document has Amendment No. 1 integrated into the standard. See the link above for the companion schema.
Subscribe to The Standard, our monthly newsletter, to stay up-to-date with ATSC news and events around the world.
1776 K Street NW 8th Floor
The Advanced Television Systems Committee, Inc., is an international, non-profit organization developing voluntary standards and recommended practices for digital terrestrial broadcasting. ATSC member organizations represent the broadcast, broadcast equipment, motion picture, consumer electronics, computer, cable, satellite, and semiconductor industries. ATSC also develops digital terrestrial broadcasting implementation strategies and supports educational activities on ATSC standards.