advanced t-dmb (at-dmb) standard for enhanced mobile tv service

Fostering worldwide interoperabilityGeneva, 13-16 July 2009

Advanced T-DMB (AT-DMB) standardfor 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])

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



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



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.


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


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


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


Concept of Multi-channel Service(AT-DMB)


Concept of high quality Service


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


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)


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


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


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)


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


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)


QPSK

16QAM


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)


T-DMB Market Share in Korea

19Geneva, 13-16 July 2009


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


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


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)


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.)

advanced t-dmb (at-dmb) standard for enhanced mobile tv service

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