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Consideration of a transport mechanism on broadcasting from the viewpoint of
emerging hybrid content delivery systems
Shuichi AOKI, Katsunori AOKI, Keigo MAJIMA, and Hiroyuki HAMADA
January 20, 2010 @Kyoto Research Park, Japan
Science and Technology Research Laboratories, Japan Broadcasting Corporation
MMT Workshop / the 91st MPEG meeting
2
Today’s presentationCharacteristics of broadcasting and telecommunication
MPEG-2 TS based hybrid content delivery system
Personalizing broadcast programs by using extra components
on telecommunication
IP-based hybrid content delivery system
A transport mechanism for IP packets over broadcasting
channels
An effective file-based broadcasting system
using telecommunication
Conclusions
3
Digital broadcasting
HDTV
Satellite Broadcasting
Terrestrial Broadcasting
UHF band
ISDBISDB--SSISDBISDB--TT
ISDB: Integrated Services Digital Broadcasting
Fixed reception
12GHz band
Broadcasting can stably provide content to many viewers at a time.
Mobile receptionOne-seg “digital terrestrial service for mobile devices”
*In the case of Japan
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Telecommunication
Viewers obtain desired content from a wide variety of options.
Viewers request desired content at their convenience.
Telecommunication services effectively provide requested content, but suffers from congestion.
Limited network bandwidth.
Limited equipment throughput.
On telecommunication:
requestresponse
5
Combination of broadcasting and telecommunication
Stable, Point to Multi Point, Simultaneous, Unidirectional
Point to Point, Bidirectional, Congested
Service providerBroadcast Telecom.
Multimedia services
Hybrid systems leads to enriched multimedia services.
Broadcasting
Telecommunication
6
Today’s presentationCharacteristics of broadcasting and telecommunication
MPEG-2 TS based hybrid content delivery system
Personalizing broadcast programs by using extra
components on telecommunication
IP-based hybrid content delivery system
A transport mechanism for IP packets over broadcasting
channels
An effective file-based broadcasting system
using telecommunication
Conclusions
7
TS-based hybrid content delivery systemPersonalizing presentation of broadcast programs by using extra components on telecommunication.
Main Service Extra & Personal
Extra components
Telecommunication
Keep today’sMPEG-2 TS based digital broadcasting system unchanged
Extra components also delivered in MPEG-2 TS.
Personalized viewing
8
System architectureAt receiver, MPEG-2 TS in broadcasting and those in telecommunication are independently decoded.
Receiver
Video
AudioBroadcasting
Buffer
STC
PCRPCR
CL
Tuner & decoder
STC
Telecommunication
BufferIP reception& decoder
PTS
CLFixeddelay
+
Shared
PTS
CL
Extra components(streaming video/audio etc)Broadcaster
Several components are decoded and presented in sync with each other after being buffered.
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Network
Developed prototype – translated subtitle service
Receiver Network server
Translator software (To other languages) Multi-lingual subtitles with PTS
referring to broadcast PCR
Tuner
Presentation appear later than normal broadcast programs
PCR
Fixed delay
Subtitle msg dispatcher Recv
Actual broadcast program with subtitles
Subtitle extraction with PTS
Decoderw/ bufferTuner Sync
and present
Experiments to synchronize live-generated extra components with delayed broadcast programs
Decoder
10
Alternative transport for hybrid content delivery system
Method 1In the system, extra components delivered in MPEG-2 TS packets encapsulated into IP packets.
Receiver decodes TS in broadcasting and TS in telecommunication, separately.
IP pktTelecom.
Decoder
Decoder
Composition
Method 2One alternative transport for broadcasting is to transport IP packets in which coded signals are encapsulated. IP pkt
Telecom.
Signal
IP pktBroadcast
Signal
TS pktBroadcast
Signal
TS pktSignal
Decoder
11
Today’s presentationCharacteristics of broadcasting and telecommunication
MPEG-2 TS based hybrid content delivery system
Personalizing broadcast programs by using extra components
on telecommunication
IP-based hybrid content delivery system
A transport mechanism for IP packets over broadcasting
channels
An effective file-based broadcasting system
using telecommunication
Conclusions
12
A new multiplexing scheme for broadcasting systemTransporting IP packets over broadcasting channels enables broadcasting and telecommunication to harmonize.
Advanced satellite broadcasting system in Japan has two multiplexing schemes to efficiently transport IP packets.
Multimedia broadcasting
Real-time services File-based services
Video and audio
Data and control
Video, audio, and metadata file
Control signals
PES Section IP packet Signalling packet
MPEG-2 Systems TLV multiplexing scheme
Transmission slot (channel coding and modulation)
New scheme well-suited for transporting IP packetsTLV: Type - Length - Value
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Difference of encapsulation
Video
Audio
PSI/SI
PES
PES
Section
TS packetData Section
Video
Audio
Metadata
FileFile
FileFile
IP packet
TLV packetTransmission control signals
MPEG-2 TS TLV multiplexing scheme
All information transported as fixed-length MPEG-2 TS packets.
All information transported as variable-length TLV packets.
TLV multiplexing scheme realizes common transport mechanism between broadcasting and telecommunication.
14
TLV multiplexing scheme overview
IP packets efficiently transported over broadcasting channels.
Three elements to efficiently transport IP packets
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File delivery on the TLV multiplexing scheme
- Download header added to each unit.
- IP header information also added.TLV multiplexing scheme multiplexes constructed IP packets.
File attribute information
Segmentation
…. …..FileFile
Download header IP header and UDP header
IP packets
Data unit
Unit #(N-1)
Unit #N
Unit #1
Unit #(N-1)
Unit #N
…..
Unit #1
Unit #(N-1)
Unit #N
Unit #1
FileFile
Zip
FileFile FileFile FileFile
TLV multiplexing scheme developed for file-based broadcasting.
File delivery method with a small overhead also developed.File segmented into data units of given size.
File attribute information generated describing file ID, file size, file name, etc.
16
Today’s presentationCharacteristics of broadcasting and telecommunication
MPEG-2 TS based hybrid content delivery system
Personalizing broadcast programs by using extra components
on telecommunication
IP-based hybrid content delivery system
A transport mechanism for IP packets over broadcasting
channels
An effective file-based broadcasting system
using telecommunication
Conclusions
17
IP-based hybrid content delivery systemSystem can integrally provide popular content as well as requested content.
Tuner
Router
PacketIP
packetIP
File
packetIP
File server Router
PacketIP
Multiplexing
Service provider
HomeTelecommunication
Broadcasting
Packet
Compressed header
Popular content
License info.
Requested content
- Requested content and license delivered over telecommunication.- Popular content delivered over broadcasting channels.
18
Receiver configuration for the systemBroadcasting channels and telecommunication networks integrated as IP-path by TLV multiplexing scheme.
Broadcasting demod. and demux
IP multicast transfer process
IP unicast transfer process
Storagedevice
Electronic content guide
Decryptor
Demux
A/V decoder
Ethernet
IP packet
Control
Broadcasting
Receiver
Telecommunication
A/V out
IP packet
Many modules commonly used for broadcasting and telecommunication.
For broadcasting
For telecommunication
Common parts
19
Demonstration of developed prototypeDeveloped prototype demonstrated at NHK Science and Technology Research Laboratories open house in May 2009.
Service procedures and file delivery on prototype system demonstrated.
20
Standardization activities
TLV multiplexing scheme
Standardized in ARIB STD-B32 "Video coding, audio coding, and
multiplexing specifications for digital broadcasting“
Draft new ITU-R Recommendation "Multiplexing scheme for variable-
length packets in digital multimedia broadcasting systems“
agreed for adoption and approval in November 2009.
File-based broadcasting system
Under standardization at ARIB and ITU-R.
ARIB : Association of Radio Industries and Businesses
21
Today’s presentation
Characteristics of broadcasting and telecommunication
MPEG-2 TS based hybrid content delivery system
Personalizing broadcast programs by using extra components
on telecommunication
IP-based hybrid content delivery system
A transport mechanism for IP packets over broadcasting
channels
An effective file-based broadcasting system
using telecommunication
Conclusions
22
ConclusionsBroadcasting and telecommunication have different characteristics.
Combining different types of delivery media improves user experience as they complement each other.
Two hybrid content delivery systems introduced incorporating broadcasting and telecommunication.
MPEG-2 TS based system to personalize the presentation of broadcast programsIP-based system to effectively deliver file-based content
Hybrid content delivery systems increasing because of their usability.
Systems seek efficient and functional transport mechanism commonly used in both broadcasting and telecommunication.
Broadcast Telecom.Transport mechanism
Coded signals Control signals