지상파 DMB 대화형 서비스는 사용자가 휴대ㆍ이동 단말을 통하여 방송을 시청하면서 이와 동시에 관련 대화형 데이터를 수신하고, 필요에 따라 통신망과 접속하여 풍부한 부가 데이터를 수신할 수 있는 차세대 양방향 데이터 서비스이다. 지상파 DMB 대화형 서비스는 개인화된 단말에서 방송과 통신이 연동ㆍ융합될 수 있는 서비스이므로, 향후 지상파 DMB의 활성화와 더불어 점차 그 수요가 증대될 것으로 기대된다. 이에 한국정보통신기술협회 산하 DMB 프로젝트그룹에서는 지상파 DMB 대화형 서비스에 대한 표준 권고안이 작성중에 있으며, 2006년 하반기에는 권고안을 기반으로한 지상파 DMB 대화형 방송 시범서비스가 시작될 예정이다. 본 논고에서는 지상파 DMB 서비스 기술에 대하여 살펴보고, 관련 기술개발 동향 및 전망에 대하여 소개한다.
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