Abstract:
본 발명은 MMT 수신 엔티티에서의 수신품질피드백(Reception Quality Feedback: RQF)메시지를 이용한 MMT 버퍼 모델 관리 방법으로, MMT 송신 엔티티로부터 측정 구성(measurement configuration : MC) 메시지를 수신하는 단계와, 상기 수신된 MC 메시지의 요청에 따라, 최대 전송 지연과 최소 전송 지연을 측정하는 단계와, 상기 측정된 최대 전송 지연과 최소 전송 지연을 포함하는 RQF 메시지를 갱신하는 단계와, 상기 갱신된 RQF 메시지를 MMT 송신 엔티티에 전송하는 단계를 포함한다.
Abstract:
PURPOSE: A timing information providing method using MPEG media transport (MMT) control layer signaling for synchronizing MMT package stream in an MMT hybrid delivery service and an MMT packet stream synchronizing method are provided to enable a server to recognize the position of media data corresponding to a starting point of a service required by a client from MMT media data stored in the server based on exchanged information and successively perform a transmission service for the client from the media data position. CONSTITUTION: A first server (210) and a second server (250) transmit a first media object and a second media object, respectively. The second server generates timing information for synchronization of a first packet including the first media object and a second packet including the second media object when a client (230) requests transmission for the second media object. The second server provides the timing information and the second packet to the client. [Reference numerals] (210) First server; (211) Generate an MMT packet; (213-1,213-2) First MMT packet including a foreign movie; (215) First MMT packet including basic subtitles; (230) Client; (231) Request the foreign movie and the basic subtitles; (233) Depacketize, synchronize, and play the first MMT packet; (235) Request SDH subtitles by a user; (237) Request the SDH subtitles; (239) Determine the synchronization between two media objects; (241) Depacketize the first MMT packet and the second MMT packet and play the synchronized foreign move and the SDH subtitles; (250) Second server; (251) Generate timing information by calculating stat_clock_offset, STk; (253) Control message of a C-2 layer; (257) Generate a second MMT packet; (259) Second MMT packet including the SDH subtitles
Abstract:
PURPOSE: A timing information providing method an MMT packet stream synchronization method are provided to obtain the absolute time information for synchronization of each media device transmitted from each server using timing information. CONSTITUTION: A first server(310) transmits a first media entity. The second server(350) transmits a second media entity. The second server generates timing information for synchronization of a second packet including the second media entity and a first packet including the first media entity(351). The second server provides the timing information and the second packet including the second media entity to a client(359). The timing information included in a control message of an MMT C.2 layer is provided to the client(313-2). [Reference numerals] (310) First server; (311) Generating an MMT packet; (313-1,313-2) First MMT packet including a foreign film; (315) First MMT packet including a default subtitle; (330) Client; (331) Requesting the foreign film and the default subtitle; (333) De-packetizing and synchronizing the first MMT packet and playing; (335) Requiring SDH subtitle viewing by a user; (337) Requesting the SDH subtitle; (339) Determining the synchronization between two media objects; (341) De-packetizing the first and second MMT packets and playing the synchronized foreign film and the SDH subtitle; (350) Second server; (351) Generating timing information by calculating start_clock_offset, MCR_0; (353) Control message of a C layer; (357) Generating a second MMT packet; (359) Second MMT packet including the SDH subtitle