Journal of Broadcast Engineering (방송공학회논문지)

The Korean Institute of Broadcast and Media Engineers (한국방송∙미디어공학회)
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T-DMB Hybrid Data Service Part 1: Hybrid BIFS Technology

T-DMB 하이브리드 데이터 서비스 Part 1: 하이브리드 BIFS 기술

  • Lim, Young-Kwon (Department of Electronics and Computer Engineering, Hanyang University) ;
  • Kim, Kyu-Heon (College of Electronics & Information, Kyung Hee University) ;
  • Jeong, Je-Chang (Department of Electronics and Computer Engineering, Hanyang University)
  • 임영권 (한양대학교 전자컴퓨터통신공학부) ;
  • 김규헌 (경희대학교 전자정보대학) ;
  • 정제창 (한양대학교 전자컴퓨터통신공학부)
  • Received : 2011.02.18
  • Accepted : 2011.02.25
  • Published : 2011.03.30
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Abstract

Fast developments of broadcasting technologies since 1990s enabled not only High Definition Television service providing high quality audiovisual contents at home but also mobile broadcasting service providing audiovisual contents to high speed moving vehicle. Terrestrial Digital Multimedia Broadcasting (T-DMB) is one of the technologies developed for mobile broadcasting service, which has been successfully commercialized. One of the major technical breakthroughs achieved by T-DMB in addition to robust vehicular reception is an adoption of framework based on MPEG-4 System. It naturally enables integrated interactive data services by using Binary Format for Scene (BIFS) technology for scene description and representation of graphics object and Object Descriptor Framework representing multimedia service components as objects. T-DMB interactive data service has two fundamental limitations. Firstly, graphic data for interactive service should be always overlaid on top of a video not to be rendered out of it. Secondly, data for interactive service is only received by broadcasting channel. These limitations were considered as general in broadcasting systems. However, they are being considered as hard limitations for personalized data services using location information and user characteristics which are becoming widely used for data services of smart devices in these days. In this paper, the architecture of T-DMB hybrid data service is proposed which is utilizing broadcasting network, wireless internet and local storage for delivering BIFS data to overcome these limitations. This paper also presents hybrid BIFS technology to implement T-DMB hybrid data service while maintaining backward compatibility with legacy T-DMB players.

1990년대 이후 방송 기술의 눈부신 발전은 고선명 방송 서비스의 도입으로 가정에서의 고화질 방송 서비스 제공을 가능하게 하였을 뿐만 아니라, 이동 방송 서비스의 등장으로 고속으로 이동하는 차량에서도 방송 서비스를 즐길 수 있도록 하였다. Terrestrial Digital Multimedia Broadcasting (T-DMB) 기술은 이동 방송 서비스 제공을 위해 개발된 기술 중 성공적으로 상용화된 기술 중 하나이다. 고속 이동체에서의 안정적인 방송 수신 기능 외에 T-DMB의 기술적 혁신 중 주목할 만한 것으로는 MPEG-4 표준에 기반 한 시스템 프레임워크를 들 수 있다. 이는 장면 기술(Scene Description) 및 그래픽 객체 표현 언어인 Binary Format for Scene (BIFS)와 객체(object) 개념의 멀티미디어 구성 요소 표현 방식인 Object Descriptor (OD) 프레임워크를 통해 대화형 데이터 서비스를 제공할 수 있다. 그런데, T-DMB 대화형 데이터 서비스에는 두 가지 근본적인 제약 사항이 존재한다. 첫 번째 제약 사항은 대화형 서비스를 위한 그래픽 데이터는 비디오 화면을 벗어날 수 없어 항상 비디오 화면 위에 중첩되어 표현되어야 한다는 것이다. 두 번째 제약 사항은 양방향 서비스를 위한 데이터는 항상 방송망을 통해서만 전송되어야 한다는 것이다. 이러한 제약 사항은 단말의 위치 정보나 사용자의 특성 정보를 반영한 개인 맞춤형 서비스 제공의 제약조건이 되고 있다. 본 논문에서는 이러한 제약 사항을 극복하기 위해 기존방송망 및 무선 인터넷 망을 통해 각각 전송되는 장면 기술 정보 뿐만 아니라, 단말의 저장 장치에 저장된 장면 기술 정보를 활용하는 T-DMB 하이브리드 데이터 서비스 방식을 제안하고 기존 T-DMB 데이터 서비스와의 역호환성을 보장하는 하이브리드 BIFS 기술을 제안한다.

Keywords

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