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-GRSC7-021

FOR: Presentation

SOURCE: TTA, Korea

AGENDA ITEM: 4.2

CONTACT(S): Daejung Kim (kdj@tta.or.kr)

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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 the international harmonization of DMB standards

TTA T-DMB StandardsT-DMB Basic interface standards (’05)T-DMB data broadcasting Standards (’08)

International HarmonizationT-DMB Specification was reflected in ITU-R REC-BT.1883 (‘07)T-DMB Middleware platform Specification(TTAS.KO-07.0049) is expected to harmonize with ETSI standard in 2009

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Highlight of Current Activities

Service coverageLaunched T-DMB commercial service (‘05, Korea) Nowadays, T-DMB service covers the whole national area including Seoul subway area

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

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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 is required within the limited frequency band.

Need to make new enhanced standardThere is an urgent need for the next step in the mobile broadcasting technology compensating T-DMB to penetrate the global mobile broadcasting market.

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Strategic Direction

Requirements for new enhanced standard(AT-DMB)The Backward compatible with the T-DMB serviceIncreasing 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 countriesTPEG, BWS, Clipcasting, Filecasting services in the mobile environment shall be able to applyInteractive data services using extended channels of AT-DMB and wireless communications

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Challenges

AT-DMB service is composed of base layer and enhancement layer

Base layer : T-DMB serviceEnhancement layer : additional data service and video

Concept of multi-channel service Concept of High-quality service

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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 codeEnhancement layer requires high performance channel codeThis has better performance compared with convolutional code applied to T-DMB

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Future Direction

As TTA StandardTTA PG801 completed AT-DMB std.& published in June 18, 2009Enhancement 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

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Future Direction

For enhancement of serviceInteroperable service technology with various wireless communication network like WiBro and WCDMAInteractive data services using extended channels of AT-DMB and wireless communicationsProviding 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)

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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Supplementary Slides

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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)

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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

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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)

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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

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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)

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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

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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)

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T-DMB Market Share in Korea

19Geneva, 13-16 July 2009

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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

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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)