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ATSC 3.0 – Next Generation TelevisionWhere are We and Where are We Headed?
Rich Chernock
JUNE 8, 2018
ATSC 3.0 has been released!
What we’ve achieved
Time
Freq
uenc
y
Bootstrap Signal Frame
...
Preamble
L1-B
asic
Sign
alin
g
L1-D
etai
l Sig
nalin
g
...
Sub-
Fram
e Pa
yloa
d
Sub-
Fram
e Pa
yloa
d
Sub-
Fram
e Pa
yloa
d
• Extensibility / Flexibility– Bootstrap (A/321) – starting point– Possible to evolve system/physical layer
• Announces technology used in each frame
– Layers signal technologies to layer above– Allows graceful evolution over time
Bootstrap emission is the starting point for ATSC 3.0◦ Robust synchronization
◦ Service discovery◦ Coarse time, frequency acquisition◦ 5 MHz bandwidth
◦ Receivable at <−6 dB SNR (with FER = 1E-2)
• 24 signaling bits• Sampling frequency• Channel bandwidth• EAS wake-up• Preamble selection
• Preamble frame control• Basic / detail
Results – Flexibility, Longevity & Public Service
Bootstrap allows mixture of different phy technologies in a single broadcast
Extensibility via versioning & mixture of phy’s◦ Can support a mixture of today’s phy tech along with tomorrow’s in a way that
allows a receiver to utilize what it understands
Wake-up of receiving devices in standby mode in case of an emergency situation◦ Mechanisms to reduce annoyance factor & battery conservation (for mobile
devices)
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets
broadcasters needs/plans– Close to Shannon Limit– TDM/FDM/LDM– Multiple PLPs– SFN– Lots of knobs to turn
0
2
4
6
8
10
12
-10 -5 0 5 10 15 20 25 30 35
BIC
M L
ink
Effic
ienc
y (b
its/s
/Hz)
SNR (dB)
Bit Interleaving, Coding, and Modulation Performance
Shannon Limit
ATSC 3.0, QPSK
ATSC 3.0, 16QAM
ATSC 3.0, 64QAM
ATSC 3.0, 256QAM
ATSC 3.0, 1024QAM
ATSC 3.0, 4096QAM
ATSC 1.0
LDM overlay spectrum
RFChannel
BW
5 dB
Core Layer6 dB
Enhanced Layer Future Extension Layer
> Indoor penetration
Results - Better coverage & deep indoors via SFN
Multiple transmitters in a SFN can be used to extend coverage and add capacity by raising the SNR.
OFDM guard interval alleviates potential inter-symbol interference arising from multiple transmitters.
Indoor penetration
Radio Horizon
Results - More efficient use of BW for Fixed + Mobile
SHVC (Video Spatial Scalability)◦ Base layer (BL) optimized for mobile reception◦ Enhancement layer (EL) optimized for UHD resolution
Considerable efficiency advantage vs simulcast is possible
SHVC encoder
BL encoder(HD)
EL encoder(UHD)
2x down-scaling ATSC
3.0 PHY layerUHD
video High BW
High robust-ness
HD, audio
HEVC decoder
SHVC decoder
Mobile / distant receiver
Fixed receiver
Mobile/Portable Channel
Fixed channel
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets broadcasters
needs/plans• Smart Media Delivery
– Broadcast IP Transport– Segmented streaming delivery– Hybrid – combined broadcast &
broadband delivery– Common System Time– Realtime & NRT
Physical Layer
ATSC Link-Layer Protocol (ALP) Data Link Layer
IP IP
UDP TCP
MMTP ROUTE
HTTP ProxyHTTP
MM
T-sp
ecifi
c Si
gnal
ing
ROU
TE-s
peci
fic
Sign
alin
g
MPU (ISO BMFF)
NRT File
Delivery
DASH Segment (ISO BMFF)
NRT File
Delivery
All Signali
ng Object
s
DASH Player/DecoderMPU Player/Decoder
Broadcast Broadband
LLS (SLT)
EME/CENC EME/CENC
Anno
unce
men
t
Applications (HTML5/JavaScript)
ATSC 3.0 Physical Layer (OFDMA RF)
Tablet
WiFi
Smartphones
4G
Smart TV
Internet
PC
moovftyp moof mdatmoof mdatmoof
moovftyp moof moof moofstyp styp
ISOBMFF file
Initialization Segment Media Segment Media Segment
mdat
mdat mdatmdat
ResultsBroadcasting no longer an independent silo◦ Use of IP allows taking advantage of evolution speed of the Internet
Broadcast and broadband as peer delivery mechanisms◦ Enables new types of hybrid services◦ Ability to seamlessly incorporate niche content
Enable new business models◦ Localized insertion of ads or other content◦ New revenue model for broadcasters that has previously
been available to only cable or IPTV operators ◦ Addressable advertising
Tablet
WiFi
Smartphones
4G
Smart TV
Internet
PC
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets broadcasters
needs/plans• Smart Media Delivery• Enhanced Story-Telling
– UHD: 4K, HDR, WCG, HFR, Scalability– Fully immersive Audio– Personalized audio– HTML 5 based interactivity
NetAnnounce
Crowd
NORMAL
LocalAnnounce
PA
Results
Retain (and attract) viewership via high quality content capabilities◦ Video: More dots (4K), More contrast (HDR), More colors (WCG), Smoother
motion (HFR)◦ Audio: Personalization (early), full immersion (later)
New business models possible◦ Broadcaster App drives new functionality◦ Targeted ad insertion◦ NRT content usage
◦ Interactivity based on W3C tech (including HTML5)◦ No need to train content creators how to do things for TV as opposed to Internet
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets broadcasters
needs/plans• Smart Media Delivery• Enhanced Story-Telling• System that meets public service needs
– Accessibility: Closed Captioning, Open Captioning, Descriptive Video
– Advanced Emergency Alerting
• Wakeup from standby
• Geotargeting & rich media
Results: Accessibility FeaturesATSC 3.0 brings new public service capabilities◦ Robust audio and closed-caption transmission, even when picture fails◦ Improved audio intelligibility for hearing impaired◦ New features for improved dialog / narrative intelligibility
(track-specific volume control)◦ Continued support for video description services
ATSC 3.0 feature set supports◦ Visually Impaired (VI)
◦ Video Description
◦ Hearing Impaired (HI)◦ Closed Caption◦ Closed Signing◦ Dialog Intelligibility
◦ Emergency alerts and messaging◦ Emergency crawls and audio tracks
ResultsStreamlining accessibility workflow & more efficient delivery◦ Use of audio objects with rendering at the receiver
Allowing more capabilities than in the past◦ More simultaneous audio languages◦ Simultaneous ASL video window◦ Enabling full audio experience when accessible audio features used
Allows broadcasters to bring additional value to community through Advanced Alerting capabilities◦ Wake-up sleeping devices◦ Geotargeting◦ Rich Media
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets broadcasters needs/plans• Smart Media Delivery• Enhanced Story-Telling• System that meets public service needs• Security
– CA & DRM
– Secure broadband communications
– Application signing
– Securing the broadcast from MITM attacks
ATSC 3.0 SecuritySystem-wide security is a critical function today for any Internet-connected device◦ A TV set that can be hacked? Yes!
Content protection for high-value programs is very important◦ Digital Rights Management (DRM) is an essential requirement for content providers
Security enables new business models for ATSC 3.0◦ Subscription services◦ Monthly fee for access to the service◦ “Freemium” (i.e., user registers and then content is free)
Subscription options for alternate components◦ Custom views; e.g., pay for “dashboard cam” video in an auto
racing event◦ Pay-per-view programs◦ HD free-to-air, UHD subscription service
ResultsContent Encryption (CA and/or DRM)◦ Allows charging for premium content◦ Allows use of “Freemium” model◦ For example, agreement to allow anonymous usage monitoring in return for access to extra/premium content
◦ Allows protection of content once it arrives on receiving device
Allows transactions over the Internet◦ Return channel has same concerns as general Internet use, but same technology solutions
can be used
Provides protections against MITM attacks◦ Application & Signaling Signing ◦ Use of DRM on content & signed signaling
What we’ve achieved• Extensibility / Flexibility• Physical Layer that meets broadcasters needs/plans• Smart Media Delivery• Enhanced Story-Telling• System that meets public service needs• Security• Part of the 5G eco-system
– P2MP, IoT, high speed, ultra-reliable, lifeline communications…
Why Do We Need This?
OPPORTUNITY!
Catching a tiger by the tail (make sure you hold on)
In the past, television technologies were stable for long periods of time
Now, technology is changing at an exponentially increasing rate◦ NTSC ATSC 1.0 ATSC 3.0
For ATSC 3.0◦ Recognition that graceful evolution of technology is now required◦ A desire to become part of the internet & use its tech (the tiger)
Approach◦ Major/Minor versioning & signaling for technologies◦ Ability to signal capabilities required to “render” content◦ Use of W3C technologies & mechanisms to keep current
ATSC 3.0 in South Korea
MilestonesATSC 3.0 4K UHD Broadcasting started May 31, 2017PyeongChang 2018 Olympic Winter Games broadcast in UHD
Slide courtesy of KBS
Slide courtesy of KBS
Slide courtesy of KBS
Slide courtesy of KBS