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Global Standards Collaboration (GSC) 14. Advanced T-DMB (AT-DMB) standard for Enhanced Mobile TV Service. DJey KIM([email protected]) TTA. Highlight of Current Activities. Standardization Status of TTA PG801. Work scope of TTA PG801(DMB Project Group) Development of DMB Standards

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Presentation Transcript
slide2

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-07.0049) is expected to harmonize with ETSI standard in 2009
slide3

Highlight of Current Activities

T-DMB Service in Korea

  • 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)
slide4

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.
slide5

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 servicesin the mobile environment shall be able to apply
    • Interactive data services using extended channels of AT-DMB and wireless communications
slide6

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

slide7

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
slide8

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
slide9

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

AT-DMB Network

BL Service Channels

Mux/COFDM

(BL)

Video

T-DMB interactive services

RF

Channel

Audio

CAS

ContentServer

Mux/COFDM

(EL)

EL Service Channels

HierarchicalModulation

AT-DMB interactive services

Interactive Data

Wireless communication network

(WiBro, WCDMA, etc.)

at dmb system overview
AT-DMB System Overview

System Structure

slide13

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

Fixed Environment

(BL+EL)

Mobile Environment

(BL)

slide14

AT-DMB Service model(2)

AT-DMB Service Model – Data Broadcasting Service

  • TPEG, BWS, Clipcasting, Filecasting servicesin the mobile environment
slide15

Video 1

Video 2

Video 3

Audio 1

Benefit of AT-DMB(1)

Multi-Channel AT-DMB

Additive Channel (EL)

Basic Channel [BL)

Select

Video 1

slide16

Video 1

Video 1

Video 2

Benefits of AT-DMB(2)

High Quaility Mode

High-Quality Channel (EL)

Basic Channel [BL)

Video 1

Select

slide17

Benefits of AT-DMB(3)

Local Broadcasting Service

T-DMB

AT-DMB

AT-DMB

BL: Existing T-DMB service for resolving the shadowing area

EL: Location based service

- Local advertisement, Local bulletin service, Disaster Broadcasting etc.

slide20

Modes for Hierarchical Modulation

Operation Mode

  • B-Mode
    • BPSK forenhancement layer
    • Payload : max. 50% increase
    • Suitable for mobile reception
  • Q-Mode
    • QPSKfor enhancement layer
    • Payload : max.100% increase
    • Suitable for stationary reception
slide21

Band

VHF

UHF

Allotment

TV

(ch. 2∼4)

TV

(ch. 5∼6)

FM Radio

TV / T-DMB

(ch. 7∼13)

TV

(ch. 14∼60)

Frequency

(MHz)

54∼72

76∼88

88∼108

174∼216

470∼752

T-DMB Frequency Allotment (1)

T-DMB Freq. Band in Korea

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

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