ATSC 3.0 : Candidate Standards
A Candidate Standard has received significant review within a Specialist Group. Advancement of a document to Candidate Standard is an explicit call to those outside of the related Specialist Group for implementation and technical feedback. This is the phase at which the Specialist Group is responsible for formally acquiring that experience or at least defining the expectations of implementation.
Documents are provided in the links below in the Acrobat (PDF) format.
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A/324 Candidate Standard RevisionMost Recent Document Approved: 10 April 2024
This document is a revision of A/324, “Scheduler / Studio to Transmitter Link.” A/324 specifies the protocol on the Studio-to-Transmitter Link (STL) from studio side infrastructure to a Single Frequency Network (SFN) of Transmitters. It defines delivery protocols for ALP Transport. The document also defines possible interfaces among the studio infrastructure, for example the interconnection of the ATSC 3.0 Link Layer Protocol (ALP) and a Broadcast Gateway. A/324 specifies certain constraints on the scheduling of content and signaling on the Physical Layer. The described scheduling process enables Preamble generation and emission time management. It specifies certain aspects of Transmitter behavior and certain parameters of Transmitter operation.
This document is a Candidate Standard and may be updated from time to time by the originating specialist group, TG3/S32. The Candidate Standard period extends to 31 December 2024. The CS period may be shortened or extended by TG3.
Download “ATSC Candidate Standard: Revision of A/324:2024-04, Scheduler / Studio to Transmitter Link”, approved 10 April 2024. Accompanying schema is also available.
A redline showing changes relative to the current published version can be downloaded from this link: A/324 CS redline.
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A/344:2024-04 Candidate Standard RevisionMost Recent Document Approved: 22 August 2024
This document describes the interactive content environment provided by an ATSC 3.0 receiver. This environment is comprised of a standard W3C User Agent with known characteristics, a WebSocket interface for obtaining information from the receiver and controlling various receiver functionality, and an HTTP interface for accessing files delivered over broadcast. This document also specifies the life cycle of the interactive content when delivered over broadband or broadcast or both.
The Candidate Standard period extends to 28 February 2025.
Download “Candidate Standard Revision of A/344:2024-04, ATSC 3.0 Interactive Content”, approved 22 August 2024. A redline showing changes relative to the current published version of A/344:2024-04 is also provided.
A Change Log is provided that summarizes the proposed changes.
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A/345, VVC Video Candidate StandardMost Recent Document Approved: 28 March 2024
This document describes the video coding constraints on ITU-T Rec. H.266 | International Standard ISO/IEC 23090-3 (“VVC”) when it is used for video compression in the ATSC 3.0 Digital Television System. Any other video coding technologies in the ATSC 3.0 system are documented in their own ATSC Standard(s). ATSC A/300 provides references to the various video coding technology document(s) in the ATSC 3.0 system. Signaling of the video compression technology in use is defined in ATSC A/331.
This document is a Candidate Standard and may be updated from time to time by the originating specialist group, TG3/S41. The Candidate Standard period extends to 31 December 2024. The CS period may be shortened or extended by TG3.
Download “A/345:2024-03, ATSC Candidate Standard: VVC Video”, approved 28 March 2024. This document is an update of the A/345 Candidate Standard approved on 16 November 2023.
A redline showing changes relative to the previously pubished version can be downloaded from this link: “A/345:2023-11”.
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