Advanced TDMB ATDMB standard for Enhanced Mobile TV Service

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Advanced T-DMB (AT-DMB) standardfor Enhanced
Mobile TV Service
Global Standards Collaboration (GSC) 14

• DJey KIM(kdj_at_tta.or.kr)
• TTA

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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-07.0049)
  will be harmonized with ETSI Spec in 2009

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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)

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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.

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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

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Challenges

• 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

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Future Direction

• As TTA Standard
• 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

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Supplementary Slides
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Concept of Multi-channel Service (AT-DMB)
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Concept of high quality Service
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AT-DMB Standard Overview
AT-DMB Standard
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AT-DMB System Overview
System Structure
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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)

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AT-DMB Service model(2)
AT-DMB Service Model Data Broadcasting Service

• TPEG, BWS, Clipcasting, Filecasting services in
  the mobile environment

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Benefit of AT-DMB(1)
Multi-Channel AT-DMB
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Benefits of AT-DMB(2)
High Quaility Mode
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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.

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Comparison of Mobile-TV Spec
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T-DMB Market Share in Korea
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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

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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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T-DMB Frequency Allotment (2)
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Interactive services