Technology Group 3
Scope of TG3
The ATSC 3.0 Technology Standards Group (called TG3) will develop voluntary technical Standards and Recommended Practices for the next-generation digital terrestrial television broadcast system. ATSC 3.0 is likely to be incompatible with current broadcast systems and therefore must provide improvements in performance, functionality and efficiency significant enough to warrant implementation of a non-backwards-compatible system. Interoperability with production systems and non-broadcast distribution systems should be considered.
TG3: Chair – Rich Chernock, Triveni Digital
Chief Science Officer, Triveni Digital, Inc.
Princeton Junction, NJ
Dr. Chernock is currently Chief Science Officer at Triveni Digital. In that position, he is developing strategic directions for monitoring, content distribution and metadata management for emerging digital television systems and infrastructures. Previously, he was a Research Staff Member at IBM Research, investigating digital broadcast technologies.
TG3 Specialist Groups
TG3/S31: System Requirements and Program Management
Chair: Skip Pizzi, NAB
Vice-Chair: Ms. Madeleine Noland, Zenith Electronics LLC
The Specialist Group on ATSC 3.0 System Requirements and Program Management (called TG3/S31) will solicit use cases and develop scenarios, and examine them within various industry contexts for the next-generation digital television broadcast system (ATSC 3.0). These scenarios will be used to derive a set of System Requirements and the associated Glossary for ATSC 3.0, which will in turn enable the development of Technical Standards and Recommended Practices for such future service by TG3 and its other subgroups. The group will manage the ongoing development and documentation of these System Requirements and Glossary as appropriate over time.
The group will assist in the review, coordination and consolidation of work within TG3’s subgroups, including reviewing subgroup output for adherence to the System Requirements, coordinating interdependent deliverables and timelines, assisting in identifying and resolving work overlaps or gaps between groups, drafting outlines and shared sections of documents requiring multiple subgroup input, and other similar tasks as assigned by TG3.
The Specialist Group on System Requirements and Program Management, TG3/S31, has developed Requirements for the ATSC 3.0 system, based on its solicitation and collection of use cases for a next-generation television system from around the world the group, and extraction of 13 “Usage Scenarios” describing the desired attributes of the ATSC 3.0 system. From these scenarios the group developed an initial set of System Requirements that TG3 assigned to various other Specialist Groups as guidance for the drafting of language for the ATSC 3.0 standard.
The group has moved into a maintenance mode on this front, where additional Requirements are no longer actively solicited. Reevaluation of existing Requirements may still be considered should adequate cause to do so be presented.
The group has also engaged in other activities regarding prioritization and the coordination of Requirements’ fulfillment by other Specialist Groups in TG3, as well as drafting of the overall “System Standard” (A/300) for ATSC 3.0.
TG3/S32: Specialist Group on Physical Layer for ATSC 3.0
Chair: Luke Fay, Sony
Vice-Chair: Mr. William Hayes, IEEE — Broadcast Technology Society
The Specialist Group on Physical Layer for ATSC 3.0 (called TG3/S32) will examine, assess, and possibly recommend technical proposal(s) for the physical layer(s) of the next generation digital terrestrial television broadcast system (ATSC 3.0). Interoperability with non-broadcast distribution systems (both traditional and non-traditional) will be considered. The term “television” should not in any way constrain the Specialist Group from considering physical layer technologies, systems and services that may currently fall outside the traditionally defined boundaries of television broadcasting.
The Specialist Group on Physical Layer for ATSC 3.0, TG3/S32, has delivered A/321 “System Discovery and Signaling” and A/322 “Physical Layer Protocol” specifications in 2016.
As depicted in the physical layer architecture, the scheduler and interface to the middle layer of ATSC 3.0 requires description.
A dedicated return link standard is a work in progress.
Recommended Practices are being written for testing the physical layer.
TG3/S33: Specialist Group on Management and Protocols
Chair: Dr. Youngkwon Lim, Samsung Electronics America, Inc.
Vice-Chair: Mr. Charles Lo, Qualcomm, Inc.
Vice-Chair: Ralf Schaefer, Technicolor
The Specialist Group on Management and Protocols (called TG3/S33) will solicit, examine and assess technical proposals and develop Standards and Recommended Practices related to technologies for the management and delivery of ATSC 3.0 services and associated metadata, over terrestrial broadcast channels and, if appropriate, broadband/bi-directional networks, to fulfill the relevant ATSC 3.0 System Requirements.
The Specialist Group on Management & Protocols, TG3/S33, was formed to primarily focus on technologies for the management and delivery of ATSC 3.0 services and associated metadata. S33 has formed three ad hoc groups. The first ad-hoc group (S33-1) is working on service delivery and synchronization while the second ad-hoc group (S33-2) is working on service announcement and personalization. The third ad-hoc group (S33-3) is working on interactive services, companion screen services, and redistribution support. S33 and each of its ad-hoc groups has approved scopes and established work plans. So far, the work has been progressing generally as planned. S33 has decided to utilize strictly an IP-based transport layer for ATSC 3.0 and ISO Base Media File Format (ISOBMFF) for streaming delivery of media. S33-1 is developing delivery system utilizing technologies from has decided to Dynamic Adaptive Streaming over HTTP (DASH), MPEG Media Transport (MMT) and Real-Time Object Delivery over Unidirectional Transport (ROUTE) protocol. Work on delivery, synchronization and Forward Error Correction (FEC) technologies is based on contributions from members. Common elements from contributions regarding this work at a high level are the use of ISOBMFF as a content format for streaming delivery (not yet agreed as the exclusive format) and the use of Coordinated Universal Time (UTC) (or some other form of “absolute” time) for synchronization and buffer management. S33-2 is developing a document on Service Announcement & Personalization standard by using Open Mobile Alliance (OMA) Mobile Broadcast Services Enabler Suite (BCAST) (OMA BCAST) as a starting point. S33-3 has worked on technologies to support redistribution through Multichannel Video Programming Distributors (MVPDs) and issued a Call for Proposals on watermarking technologies to support content recognition through MPVD redistribution. In response, six companies have provided overview proposals. S33-3 will also specify a fingerprint solution based largely on ATSC 2.0. S33-3 is also developing standards on companion screen protocol, interactive application signaling, and interaction channel protocol.
TG3/S34: Specialist Group on Applications and Presentation for ATSC 3.0
Chair: Ms. Madeleine Noland, Zenith Electronics LLC
Vice-Chair: Brett Jenkins, LIN Media
The Specialist Group on Applications and Presentation for ATSC 3.0 (called TG3/S34) will solicit, examine and assess technical proposals and develop Standards and Recommended Practices for applications executed on, and for presentation of, the next generation digital terrestrial television broadcast system to fulfill the relevant ATSC 3.0 System Requirements. The Specialist Group will primarily focus on the portion of the ATSC 3.0 platform that defines the user experience. The work includes, but is not limited to, video codecs and formats, audio codecs and formats, closed captions and other accessibility systems, interactive applications, and other features as defined by system requirements across a multi-device ecosystem.
The Specialist Group on Applications & Presentation, TG3/S34, was formed to focus on the portion of the ATSC 3.0 platform that defines the user experience. S34 formed five ad hoc groups whose tasks are roughly divided as follows: video, audio, conceptual model/framework, interactivity, and accessibility. S34 and each of its ad-hoc groups have approved scope and work plan documents. S34 is working closely with other ATSC 3.0 groups to ensure its work plan conforms to the overall ATSC 3.0 target schedule, to the extent possible. The Conceptual Models are complete, including the model for primary ATSC 3.0 Services, which now appears in A/300 Annex C. The video group is responsible for defining video formats including interlace/progressive scan, frame rate, spatial resolution, dynamic range, color gamut, layering technologies (e.g., SHVC) etc. The group is approaching its work in stages, with a foundational specification, which may be amended to include additional advanced technologies related to High Dynamic Range, The audio group issued a Call for Proposals (CfP) for audio technology solutions that offer an immersive and personalized experience. The group selected two systems, AC-4 and MPEG-H, as regional choices (i.e., the standard supports use of one system per region/country). . The accessibility group has completed a standard for Closed Captions using technologies based on IMSC1 (optional, additional use of CTA 608/708 is also documented). The group is also working on Closed Signing designs and provides input to other ATSC groups on accessibility-related topics. The interactivity group is documenting a system based on W3C technologies supplemented by APIs designed for the broadcast television use case.
TG3/S35: Specialist Group on ATSC 3.0 Ecosystem
Chair: S. Merrill Weiss, Merrill Weiss Group
Vice-Chair: Peter Sockett, WRAL-HD
The TG3/S35 Specialist Group on the ATSC 3.0 Ecosystem will model and evaluate the environment in which ATSC 3.0 systems will be deployed. The processes of modeling and evaluation will consider the flow of content from acquisition through post production, distribution, emission, and redistribution. The Specialist Group will examine each of the types of content and functionality impacting on a fully operational ATSC 3.0 broadcast system. The examination will include such layers as video, audio, captioning, interactivity, program and service management and announcements (including emergency alerting), content identification, security, synchronization, monitoring, and redistribution by other delivery methods. The models developed will include at least block diagrams that cover the typical content and data workflows that will feed into and be associated with ATSC 3.0 emissions. This work will be published to facilitate decisions made by other ATSC Specialist Groups and to instigate development of standards by ATSC and/or other standards development organizations when gaps in required standards are found.
TG3/S36: Specialist Group on ATSC 3.0 Security
Chair: Adam Goldberg, AGP LLC
The TG3/S36 Specialist Group on the ATSC 3.0 Security will develop standards and other documents that describe the security and conditional access infrastructure of the ATSC 3.0 system, including mechanisms for supporting conditional access features like pay-per-view and subscription services. This also includes mechanisms for cryptographically protecting communications within the ATSC 3.0 system and cryptographic verification of downloaded applications.
TG3/S36 is examining the requirements for security and existing standards for meeting those requirements. It is anticipated that some existing standards may be used as a basis for the ATSC 3.0 security standard.
TG3/S37: Specialist Group on Conversion and Redistribution of ATSC 3.0 Service
Chair: Steve Calzone
ATSC TG3/S37 develops and maintains Recommended Practices, Standards, and other documents relating to the conversion and redistribution of ATSC 3.0 services.