본 고에서는 참여형 서비스 기술 동향을 먼저 소개하고 IPTV에서 시청자가 방송 영상에 실시간으로 참여할 수 있는 IPTV 참여형방송 기술에 대하여 기술한다. 본 기술은 IPTV가 가지고 있는 방송 특징과 양방향성을 고려하여 도출된 다음 요구사항을 반영하여 설계한 기술이다. 방송을 위한 방송예약 기능을 지원해야 하며 IPTV 시청자의 참여를 제어할 수 있는 절차가 잘 정의되어야 하고 이를 제어할 수 있는 호처리 프로토콜이 잘 설계되어야 한다. 끝으로 실시간 참여형방송 서비스를 위해서는 서비스 지연시간이 짧아야 한다. 이런 기능 및 성능 요구사항을 반영한 IPTV 참여형방송 시스템을 설계하고 실제 제품으로 개발하여 그 성능을 확인하였다.
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