ATSC 3.0 is the new DTT standard that will be deployed in the USA in 2020. Based on a full IP stack, ATSC 3.0 offers new uses cases & business perspectives to broadcasters and will involve deploying a complete new broadcast infrastructure in place of the current ATSC 1.0. In this new DTT architecture, the broadcast gateway, also named Scheduler, is the strategic component of ATSC 3.0
Located at the broadcast playout center or studio side, the broadcast gateway encapsulates multiple IP Streams coming from live HEVC encoders and Non-Real Time servers – EPG, interactive applications…- using ROUTE or MMTP protocols; Ensuring the ALP (ATSC Layer Protocol) encapsulation, the BBFrame real time allocation, it outputs the resulting ATSC-compliant STLTP (Studio to Transmitter Link Transport Protocol) stream over IP.
The broadcast gateway has also to interface with signaling servers and packagers, and manages automatically the ATSC 3.0 signaling from different LLS (Low Layer Signaling), including the automatic generation and delivery of the SLT (Service List Table) to ensure the exact description of the on-air services.
Finally, the broadcast gateway should support all ATSC 3.0 modulation profiles - all modulation’s capabilities - from simple subframe and single PLP, to multiple subframe and multiple PLPs, including the advanced management of LDM (Layer Division Multiplex), synchronize and preconfigure all transmitters on field to ensure the Single Frequency Network implementation. At the end, it allows Broadcasters to have the entire possibility to choose its signal coverage and robustness, targeting simultaneously multiple receivers’ capabilities within one RF channel, offering different business models for a network.
Through this paper, ENENSYS Technologies, market and technology leader in ATSC 3.0, proposes to share its unique experience of all ATSC 3.0 deployments and trials that have been setup in South Korea and in the USA, with the objective to present in a simple way all the technical points involved by a ATSC 3.0 broadcast network roll out.
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This paper will enable to attendees to perfectly understand the ATSC 3.0 global architecture, the broadcast gateway functions and the key problematics reported by the first deployments in South Korea & the USA.