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, is charged with developing Requirements for the ATSC 3.0 system, and coordinating the process of deriving a full ATSC 3.0 standard from components developed by other Specialist Groups in TG3. After soliciting and collecting use cases for a next-generation television system from around the world the group extracted a set 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 subsequently 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.
Meanwhile, the group is engaged in various activities regarding prioritization and overall progress of work and the coordination of Requirements’ fulfillment by other Specialist Groups in TG3.
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, is working to recommend the best technologies that allow the most flexibility in the most robust manner. The group recognizes the need for broadcasters to change technologies in the future and that the groundwork is being laid to enable that change with the best starting point. Mobile and indoor service has always been of focus to the group and S32 formed another ad-hoc group dedicated to look at core broadcast services and how they apply to service area (taking into account receiver signal levels required to achieve specific data capacities for such services under conditions of different morphologies, terminal types, channel impairments and interference environments.) That ad-hoc group, called S32-4, is chaired by Mr. Jim Kutzner representing FOX and vice-chaired by Mr. Ira Goldstone of Univision.
S32’s baseline skeleton architecture now has most technology recommended from the ad-hoc groups to fill in the details. S32-2 group has recommended technology for all pieces of the BICM chain, including the use of non-uniform constellations. Efficient robust performance is seen in a wide range of SNR that includes operation well below the noise level for a variety of tough channels. S32-3 group has recommended technology for a wide selection of guard intervals, strong scattered pilot patterns for robust channel estimation and many other modulation factors that enable flexibility. Interface to the upper layer is also in scope of the group to ensure efficient ATSC 3.0 system operation. Testing the recommendations will occur in 3 phases, functional, lab performance and field verification.
The ATSC 3.0 physical layer standard is being drafted in two pieces. The first piece is the system-type discovery document, which will contain signaling structure and its options along with a bootstrap signal for system synchronization. The second piece will describe all other parts of 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 may include, but is not limited to, support for codecs, linear TV services, file delivery services, interactive applications, service measurement, service announcement, service and content protection, 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 four ad hoc groups whose tasks are roughly divided as follows: video, audio, conceptual model/framework, and interactivity. 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 model for primary ATSC 3.0 Services is complete although minor edits are ongoing (audio, video, closed captions, and adjunct data as linear or on-demand offerings). Conceptual models for Electronic Service Guide (ESG), Content Advisory, Personalization, Security and Companion Devices are nearing completion. Conceptual models for emergency alerting and usage reporting are in progress. The video group is discussing video formats (e.g., interlace, frame rates, resolutions, etc.). It has received three contributions for video codec solutions, all based on HEVC technology. It is also exploring the use of High Dynamic Range (HDR), Wide Color Gamut (WCG), and layering technologies such as SHVC. The audio group has issued a Call for Proposals (CfP) for audio technology solutions and received three proposals that offer an immersive and personalized experience. The group is currently evaluating three proposals that were received in response to the CfP. S34 expects to draw heavily on both HbbTV 2.0 and ATSC 2.0 for the interactive application runtime environment. A number of features not specified in HbbTV 2.0 have been proposed and are being added to the specification.
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.
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.