Fostering worldwide interoperability Geneva, 13-16 July 2009 Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service DJey KIM([email protected]) TTA Global Standards Collaboration (GSC) 14 DOCUMENT #: GSC14-GRSC7-021R1 FOR: Presentation SOURCE: TTA, Korea AGENDA ITEM: 4.2 CONTACT(S): Daejung Kim ([email protected])
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Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service
Global Standards Collaboration (GSC) 14. Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service. DJey KIM([email protected]) TTA. Highlight of Current Activities. Standardization Status of TTA PG801. Work scope of TTA PG801(DMB Project Group) Development of DMB Standards - PowerPoint PPT Presentation
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Fostering worldwide interoperabilityGeneva, 13-16 July 2009
Advanced T-DMB (AT-DMB) standardfor Enhanced Mobile TV Service
International HarmonizationT-DMB was reflected in ETSI, ITU-R REC-BT.1883 (‘07)T-DMB Middleware platform Spec.(TTAS.KO-07.0049) will be harmonized with ETSI Spec in 2009
Fostering worldwide interoperability 3
Highlight of Current Activities
Service coverageAfter launched in 2005, T-DMB service covers the whole national area including Seoul subway area now
T-DMB receiversThe Number of DMB receivers reached 15 mil. (‘08)
- Every family owns at least one T-DMB receiver
DMB MarketT-DMB DMB receiver market is strongly driven by two types of convergence devices such as mobile phones and car navigation systems * Mobile operators(KT) have begun to aggressively push interactive services based
on BIFS technology to create additional revenue using T-DMB.* Most navigation systems now support DMB In addition TPEG services are becoming
another attractive feature of DMB enabled navigation systems(Real-time traffic information via TPEG)
T-DMB Service in KoreaT-DMB Service in KoreaT-DMB Service in KoreaT-DMB Service in Korea
Fostering worldwide interoperability 4
Highlight of Current Activities
T-DMB Service in KoreaT-DMB Service in KoreaT-DMB Service in KoreaT-DMB Service in Korea
Network CostThe network investment of T-DMB is less than that the other Mobile TV service with similar coverage
Channel capacityBut, T-DMB could provide less number of services than the other Mobile TV.More channel capacity for variety multimedia and data services was required within the limited frequency band.
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Strategic Direction
Requirements for new enhanced standard(AT-DMB)Backward compatibility with the T-DMB serviceIncreasing data rate up to maximum twice vs. T-DMB
More service models of AT-DMBAvailable as DTV alternative service in developing countriesInteractive data services using extended channels of AT-DMB and wireless communications
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Challenges
For Backward compatibilityComposed of base layer and enhancement layer
** BL(T-DMB service), EL(additional data and video service)
For increasing payload in Enhancement layer Hierarchical Modulation
** Technique for multiplexing and modulating multiple data streams into one single symbol stream (This was also adopted to TIA Mediaflo and ETSI DVT-T Spec)
Turbo code** This has better performance compared with convolutional code applied to T-DMB
By increased payload, It is possible to commercialize Multi-Channel Service in mobile environment & High-Quality Service in fixed environment
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Future Direction
As TTA StandardTTA published AT-DMB std. in June 18, 2009
• For enhancement of service• Develop Specs for interactive data services
using extended channels of AT-DMB (Return channel: wireless communications)
For International Harmonization
Presented at WorldDMB Meeting
contribute to ITU-R SG6 at the end of 2009
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Supplementary Slides
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Concept of Multi-channel Service(AT-DMB)
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Concept of high quality Service
Fostering worldwide interoperability 3Geneva, 13-16 July 2009
AT-DMB Standard Overview
AT-DMB StandardAT-DMB Standard
categoriesHierarchical modulation mode
B-mode Q-mode
Trans-missio
n
Bandwidth 1.536 MHz
Effective data rate
BL 0.8~1.728 Mbps
EL 0.288~0.576 Mbps 0.576~1.152 Mbps
FEC BL : Convolutional Code, EL : Turbo code
Code rate (EL) 1/2, 2/5, 1/3, 1/4
ModulationDQPSK(BL), BPSK(EL) or QPSK(EL)
Hierarchal modulation
Video CompressionH.264,
SVC (optional)H.264SVC
Audio CompressionBSAC,
AAC+ (optional),MPEG Surround (optional)
BSAC,AAC+ (optional),MPEG Surround
Video ResolutionQVGA (320*240),
VGA(640*480, optional)QVGA (320*240),
VGA(640*480)
Fostering worldwide interoperability
System StructureSystem Structure
AT-DMB System Overview
Hierarchical modulation
Base layer frame generation part
: Additional part for AT- DMB
: Existing T- DMB part
Service infor.(SI)
Audio service
Video service
Data service
OFDMmodulation
Terrestrial link
T-DMBreceiver
AT-DMBreceiver
...
Mux control data & SI
Fast information data
Service infor.(SI)
Audio service
Video service
Data service
...
Mux control data & SI
Fast information data
Main service m
ux.M
ain service mux.
FIB mux.
FIB mux.
DAB fram
e mux.
DAB fram
e mux.
Enhancement layer frame generation part
Fostering worldwide interoperability 5Geneva, 13-16 July 2009
AT-DMB Service model(1)
AT-DMB Service Model – AT-DMB Service Model – DTV alternative service in developing countriesAT-DMB Service Model – AT-DMB Service Model – DTV alternative service in developing countries
High-Quality Broadcasting Service
Mobile Environment : Video Service with the QVGA (CIF) size
Fixed Environment : Video service with the VGA size (Scalable Video Coding)
High-Quality
QVGA QVGA VGAVGA
Mobile Environment(BL)
Mobile Environment(BL)
Fixed Environment(BL+EL)
Fixed Environment(BL+EL)
Fostering worldwide interoperability 6Geneva, 13-16 July 2009
AT-DMB Service model(2)
AT-DMB Service Model – Data Broadcasting ServiceAT-DMB Service Model – Data Broadcasting ServiceAT-DMB Service Model – Data Broadcasting ServiceAT-DMB Service Model – Data Broadcasting Service
• TPEG, BWS, Clipcasting, Filecasting services in the mobile environment
Fostering worldwide interoperability 10Geneva, 13-16 July 2009
Benefit of AT-DMB(1)
Select
Video 1
Basic Channel [BL) Additive Channel (EL)
Video 2
Video 3Audio 1
Video 1
Multi-Channel AT-DMB Multi-Channel AT-DMB
Fostering worldwide interoperability 11Geneva, 13-16 July 2009
Benefits of AT-DMB(2)
High Quaility ModeHigh Quaility Mode
Video 1
Select
Video 1
Video 2
Video 1
Basic Channel [BL) High-Quality Channel (EL)
Fostering worldwide interoperability
BL: Existing T-DMB service for resolving the shadowing area
EL: Location based service
- Local advertisement, Local bulletin service, Disaster Broadcasting etc.