1. Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service
Global Standards Collaboration (GSC) 14
DOCUMENT #:
GSC14-GRSC7-021R1
FOR:
Presentation
SOURCE:
TTA, Korea
AGENDA ITEM:
4.2
CONTACT(S):
Daejung Kim
Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service
DJey
TTA
Geneva, July 2009

2. Standardization Status of TTA PG801
Highlight of Current Activities
Standardization Status of TTA PG801
Work scope of TTA PG801(DMB Project Group)
Development of DMB Standards
Promoting international harmonization of DMB
TTA T-DMB Standards
T-DMB Basic interface standards (’05)
T-DMB data broadcasting Standards (’08)
International Harmonization
T-DMB was reflected in ETSI, ITU-R REC-BT.1883 (‘07)
T-DMB Middleware platform Spec.(TTAS.KO ) will be harmonized with ETSI Spec in 2009

3. Highlight of Current Activities
T-DMB Service in Korea
Service coverage
After launched in 2005, T-DMB service covers the whole national area including Seoul subway area now
T-DMB receivers
The Number of DMB receivers reached 15 mil. (‘08)
- Every family owns at least one T-DMB receiver
DMB Market
T-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)

4. Highlight of Current Activities
T-DMB Service in Korea
Network Cost
The network investment of T-DMB is less than that the other Mobile TV service with similar coverage
Channel capacity
But, 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.

5. Strategic Direction Requirements for new enhanced standard(AT-DMB)
Backward compatibility with the T-DMB service
Increasing data rate up to maximum twice vs. T-DMB
More service models of AT-DMB
Available as DTV alternative service in developing countries
Interactive data services using extended channels of AT-DMB and wireless communications

6. Challenges Turbo code For Backward compatibility
Composed 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

7. Future Direction As TTA Standard For International Harmonization
TTA 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

8. Supplementary Slides
Geneva, July 2009

9. Concept of Multi-channel Service
(AT-DMB)

10. Concept of high quality Service

11. AT-DMB Standard Overview
categories
Hierarchical modulation mode
B-mode
Q-mode
Trans-mission
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
Modulation
DQPSK(BL), BPSK(EL) or QPSK(EL)
Hierarchal modulation
Video Compression
H.264,
SVC (optional)
H.264
SVC
Audio Compression
BSAC,
AAC+ (optional),
MPEG Surround (optional)
MPEG Surround
Video Resolution
QVGA (320*240),
VGA(640*480, optional)
VGA(640*480)
Geneva, July 2009

12. AT-DMB System Overview
System Structure

13. AT-DMB Service model(1)
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  VGA
Mobile Environment
(BL)
Fixed Environment
(BL+EL)
Geneva, July 2009

14. AT-DMB Service model(2)
AT-DMB Service Model – Data Broadcasting Service
TPEG, BWS, Clipcasting, Filecasting services in the mobile environment
Geneva, July 2009

15. Benefit of AT-DMB(1) Multi-Channel AT-DMB Basic Channel [BL)
Select
Video 1
Basic Channel [BL)
Additive Channel (EL)
Video 2
Video 3
Audio 1
Geneva, July 2009

16. High-Quality Channel (EL)
Benefits of AT-DMB(2)
High Quaility Mode
Video 1
Select
Video 2
Basic Channel [BL)
High-Quality Channel (EL)
Geneva, July 2009

17. Benefits of AT-DMB(3) Local Broadcasting Service
BL: Existing T-DMB service for resolving the shadowing area
EL: Location based service
- Local advertisement, Local bulletin service, Disaster Broadcasting etc.
T-DMB
AT-DMB

18. Comparison of Mobile-TV Spec
T-DMB
AT-DMB
MediaFLO
DVB-H
Bandwidth
1.536MHz
5/6/7/8MHz
Frequency
VHF/L
VHF/UHF/L
Modulation
Pi/4 DQPSK
Pi/4 DQPSK(BL)
QPSK, BPSK(EL)
Hierarchical modulation
QPSK
16QAM
64QAM
FEC 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
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)
55.4km (4k, GI=1/4)
44.8km(4k, GI=1/4)
Payload
1.088~2.304Mbps(B mode)
1.376~2.88Mbps(Q mode)
MPE-FEC=3/4)
Geneva, July 2009

19. T-DMB Market Share in Korea
Geneva, July 2009

20. Modes for Hierarchical Modulation
Operation Mode
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 20

21. T-DMB Frequency Allotment (1)
T-DMB Freq. Band in Korea TV
(ch. 2∼4)
54∼72
(ch. 5∼6)
76∼88
FM Radio
88∼108
TV / T-DMB
(ch. 7∼13)
174∼216
(ch. 14∼60)
470∼752
Allotment
Frequency
(MHz)
Band
VHF
UHF
The Metropolitan area
Allots 12MHz (ch.8 & ch.12)
6 broadcasters
Local Province
Allots 6MHz per region (6 regions in Korea)
3 broadcasters per region

22. T-DMB Frequency Allotment (2)

23. Interactive services AT-DMB Network Content Server
Interactive Data
Audio
Video
T-DMB interactive services
AT-DMB interactive services
Mux/COFDM
(BL)
Hierarchical Modulation
(EL) RF
Channel
Content Server
AT-DMB Network
CAS
BL Service Channels
EL Service Channels
Wireless communication network
(WiBro, WCDMA, etc.)