advanced t-dmb (at-dmb) standard for enhanced mobile tv service
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Fostering worldwide interoperabilityGeneva, 13-16 July 2009
Advanced T-DMB (AT-DMB) standardfor Enhanced Mobile TV Service
DJey KIM(kdj@tta.or.kr)TTA
Global Standards Collaboration (GSC) 14
DOCUMENT #: GSC14-GRSC7-021R1
FOR: Presentation
SOURCE: TTA, Korea
AGENDA ITEM: 4.2
CONTACT(S): Daejung Kim (kdj@tta.or.kr)
Fostering worldwide interoperability 2
Highlight of Current Activities
Standardization Status of TTA PG801Standardization Status of TTA PG801Standardization Status of TTA PG801Standardization Status of TTA PG801
Work scope of TTA PG801(DMB Project Group)Development of DMB StandardsPromoting international harmonization of DMB
TTA T-DMB StandardsT-DMB Basic interface standards (’05)T-DMB data broadcasting Standards (’08)
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.
Fostering worldwide interoperability 5
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
Fostering worldwide interoperability 6
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
Fostering worldwide interoperability 7
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
Fostering worldwide interoperability 8Geneva, 13-16 July 2009
Supplementary Slides
Fostering worldwide interoperability 9
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.
Benefits of AT-DMB(3)
T-DMBT-DMB
AT-DMBAT-DMB AT-DMBAT-DMB
Local Broadcasting Service
Fostering worldwide interoperability
Comparison of Mobile-TV Spec
14Geneva, 13-16 July 2009
T-DMB AT-DMB MediaFLO DVB-H
Bandwidth 1.536MHz 1.536MHz 5/6/7/8MHz 5/6/7/8MHz
Frequency VHF/L VHF/L VHF/UHF/L VHF/UHF/L
Modulation Pi/4 DQPSK Pi/4 DQPSK(BL)
QPSK, BPSK(EL)
Hierarchical modulation
QPSK
16QAM
Hierarchical modulation
QPSK
16QAM
64QAM
FEC RS RS RS RS(MPE-FEC), RS
convolutional Convolutional(BL)
Turbo(EL)
Turbo Convolutional
Code rate EEP,UEP EEP,UEP(BL)
1/2,2/5,1/3,1/4(EL)
1/3, 1/2, 2/3 1/2, 2/3, 3/4, 5/6, 7/8
FFT size 2k,1k,0.5k,0.25k 2k,1k,0.5k,0.25k 1k, 2k, 4k, 8k 2k, 4k, 8k
Interleaving depth
384msec 384msec(BL)
384msec(EL, Q mode)
768msec(EL, B mode)
750msec ~500msec
Maximum SFN size
73.8km
(GI=246us)
73.8km
(GI=246us)
55.4km (4k, GI=1/4) 44.8km(4k, GI=1/4)
Payload 0.8~1.728Mbps(@1.5MHz)
1.088~2.304Mbps(B mode)
1.376~2.88Mbps(Q mode)
2.1~8.4Mbps(@6MHz) 2.8~7.5Mbps(@6MHz, MPE-FEC=3/4)
Fostering worldwide interoperability
T-DMB Market Share in Korea
19Geneva, 13-16 July 2009
Fostering worldwide interoperability
Modes for Hierarchical Modulation
B-Mode
BPSK for enhancement layer
Payload : max. 50% increase
Suitable for mobile reception
Q-Mode
QPSK for enhancement layer
Payload : max. 100% increase
Suitable for stationary reception
I
Q
10
11
00
01
00
10
01
11
11
01
10
00
01
00
11
10
I
Q
1
00
1
1
00
1
Operation Mode
Fostering worldwide interoperability
T-DMB Frequency Allotment (1)
The Metropolitan areaThe Metropolitan area
TV
(ch. 2 4)∼
54 72∼
TV
(ch. 5 6)∼
76 88∼
FM Radio
88 108∼
TV / T-DMB
(ch. 7 13)∼
174 216∼
TV
(ch. 14 60)∼
470 752∼
Allotment
Frequency
(MHz)
Band VHF UHF
Local ProvinceLocal Province
Allots 12MHz (ch.8 & ch.12)
6 broadcasters
Allots 6MHz per region (6 regions in Korea)
3 broadcasters per region
T-DMB Freq. Band in KoreaT-DMB Freq. Band in Korea
Fostering worldwide interoperability
512kHz 192kHz 192kHz 496kHzBlock A
1.536MHz
MBC KBS SBS
204MHz 210MHzTV 1 Channel (6MHz)
Effective Data Rate 1.152Mbps
video
(512kbps)
data
(256kbps)
audio 3
(128kbps)
audio 2
(128kbps)
audio 1
(128kbps)
Block B
1.536MHz
Block C
1.536MHz
Example: ch. 12 (204 ~ 210MHz)
T-DMB Frequency Allotment (2)
Fostering worldwide interoperability 23
Interactive services
Interactive Data
Audio
Video
T-DMB interactive services
AT-DMB interactive services
Mux/COFDM(BL)
HierarchicalModulation
Mux/COFDM(EL)
RFChannel
ContentServer
AT-DMB Network
CAS
BL Service Channels
EL Service Channels
Wireless communication network(WiBro, WCDMA, etc.)
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