이동 방송 매체인 라디오에서는 주로 청취자가 차량 운전자이다 보니 서비스 권역을 이동할 경우나 음영지역에 위치할 경우 동일한 방송을 제공하는 다른 채널로 연계하는 서비스인 service following 기능에 대한 기술적인 지원이 요구되고 있다. 본 논문은 디지털라디오 방송에서 청취중인 프로그램의 상태가 양호하지 않을 경우 인접 또는 유사 채널로 자동으로 이동하여 서비스 수신을 지속할 수 있는 service following 에 대해서 기술적인 특징을 살펴보고 앙상블 다중화기에서 이를 지원하기 위한 FIG 시그널링 방법에 대해 소개하고자 한다.
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