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Fostering worldwide interoperabilityGeneva, 13-16 July 2009 Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service DJey TTA.

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Presentation on theme: "Fostering worldwide interoperabilityGeneva, 13-16 July 2009 Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service DJey TTA."— Presentation transcript:

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

2 Fostering worldwide interoperability 2 Highlight of Current Activities Standardization Status of TTA PG801 Work scope of TTA PG801(DMB Project Group) Development of DMB Standards Promoting the international harmonization of DMB standards TTA T-DMB Standards T-DMB Basic interface standards (05) T-DMB data broadcasting Standards (08) International Harmonization T-DMB Specification was reflected in ITU-R REC- BT.1883 (07) T-DMB Middleware platform Specification(TTAS.KO ) is expected to harmonize with ETSI standard in 2009

3 Fostering worldwide interoperability 3 Highlight of Current Activities Service coverage Launched T-DMB commercial service (05, Korea) Nowadays, T-DMB service covers the whole national area including Seoul subway area 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) T-DMB Service in Korea

4 Fostering worldwide interoperability 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 is required within the limited frequency band. Need to make new enhanced standard There is an urgent need for the next step in the mobile broadcasting technology compensating T-DMB to penetrate the global mobile broadcasting market.

5 Fostering worldwide interoperability 5 Strategic Direction Requirements for new enhanced standard(AT-DMB) The Backward compatible with the T-DMB service Increasing data rate up to maximum twice vs. T-DMB data rate Multi-Channel Service (mobile environment) - Provides additive A/V and data services High-Quality Service (fixed environment) - Provides near SD image quality video service & multi-channel audio service More service models of new enhanced standard(AT-DMB) Available as DTV alternative service in developing countries TPEG, BWS, Clipcasting, Filecasting services in the mobile environment shall be able to apply Interactive data services using extended channels of AT- DMB and wireless communications

6 Fostering worldwide interoperability 6 Challenges AT-DMB service is composed of base layer and enhancement layer Base layer : T-DMB service Enhancement layer : additional data service and video Concept of multi-channel service Concept of High-quality service

7 Fostering worldwide interoperability 7 Challenges More Hierarchical Modulation (employed for backward compatibility & increasing payload) Technique for multiplexing and modulating multiple data streams into one single symbol stream (This Modulation was also adopted to TIA Mediaflo and ETSI DVT-T Spec) Turbo code Enhancement layer requires high performance channel code This has better performance compared with convolutional code applied to T-DMB

8 Fostering worldwide interoperability 8 Future Direction As TTA Standard TTA PG801 completed AT-DMB std.& published in June 18, 2009 Enhancement layer : additional data service and video For International Harmonization This AT-DMB technology has been presented at WorldDMB Meeting This AT-DMB technology will be contributed to ITU-R SG6 at the end of 2009

9 Fostering worldwide interoperability 9 Future Direction For enhancement of service Interoperable service technology with various wireless communication network like WiBro and WCDMA Interactive data services using extended channels of AT-DMB and wireless communications Providing user participation in services with a return channel through communication network Interactive Data Audio Video T-DMB interactive services AT-DMB interactive services Mux/COFDM (BL) Hierarchical Modulation Mux/COFDM (EL) RF Channel Content Server AT-DMB Network CAS BL Service Channels EL Service Channels Wireless communication network (WiBro, WCDMA, etc.)

10 Fostering worldwide interoperability 10 Geneva, July 2009 Supplementary Slides

11 Fostering worldwide interoperability 3 Geneva, July 2009 AT-DMB Standard Overview AT-DMB Standard categories Hierarchical modulation mode B-modeQ-mode Trans- mission Bandwidth1.536 MHz Effective data rate BL0.8~1.728 Mbps EL0.288~0.576 Mbps0.576~1.152 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) BSAC, AAC+ (optional), MPEG Surround Video Resolution QVGA (320*240), VGA(640*480, optional) QVGA (320*240), VGA(640*480)

12 Fostering worldwide interoperability System Structure AT-DMB System Overview

13 Fostering worldwide interoperability 5 Geneva, July 2009 AT-DMB Service model(1) AT-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 VGA Mobile Environment (BL) Fixed Environment (BL+EL)

14 Fostering worldwide interoperability 6 Geneva, July 2009 AT-DMB Service model(2) AT-DMB Service Model – Data Broadcasting Service TPEG, BWS, Clipcasting, Filecasting services in the mobile environment

15 Fostering worldwide interoperability 10 Geneva, July 2009 Benefit of AT-DMB(1) Select Video 1 Basic Channel [BL) Additive Channel (EL) Video 2 Video 3 Audio 1 Video 1 Multi-Channel AT-DMB

16 Fostering worldwide interoperability 11 Geneva, July 2009 Benefits of AT-DMB(2) High Quaility Mode Video 1 Select Video 1 Video 2 Video 1 Basic Channel [BL) High-Quality Channel (EL)

17 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-DMB AT-DMB Local Broadcasting Service

18 Fostering worldwide interoperability Comparison of Mobile-TV Spec 14 Geneva, July 2009 T-DMBAT-DMBMediaFLODVB-H Bandwidth 1.536MHz 5/6/7/8MHz Frequency VHF/L VHF/UHF/L Modulation Pi/4 DQPSKPi/4 DQPSK(BL) QPSK, BPSK(EL) Hierarchical modulation QPSK 16QAM Hierarchical modulation QPSK 16QAM 64QAM FEC RS RS(MPE-FEC), RS convolutionalConvolutional(BL) Turbo(EL) TurboConvolutional Code rate EEP,UEPEEP,UEP(BL) 1/2,2/5,1/3,1/4(EL) 1/3, 1/2, 2/31/2, 2/3, 3/4, 5/6, 7/8 FFT size 2k,1k,0.5k,0.25k 1k, 2k, 4k, 8k2k, 4k, 8k Interleaving depth 384msec384msec(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 MHz) 1.088~2.304Mbps(B mode) 1.376~2.88Mbps(Q mode) MPE-FEC=3/4)

19 Fostering worldwide interoperability T-DMB Market Share in Korea 19 Geneva, July 2009

20 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 Operation Mode

21 Fostering worldwide interoperability T-DMB Frequency Allotment (1) The Metropolitan area TV (ch. 2 4) TV (ch. 5 6) FM Radio TV / T-DMB (ch. 7 13) TV (ch ) Allotment Frequency (MHz) BandVHFUHF Local 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 Korea

22 Fostering worldwide interoperability T-DMB Frequency Allotment (2)


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