1、 55713 2013 DVB IP 2014 557132013 II 1 - ( ) 2 3 8 2013 . 1367- 4 : - (ETSI): - ETSI TS 102 034 V1.4.1 (2009-08) (DVB). DVB, MPEG-2, IP (ETSI TS 102 034 V1.4.1 (2009-08). Digital Video Broadcasting (DVB); Transport of MPEG-2 TS Based DVB Services over IP Based Networks); - ETSI TS 126 346 V11.4.0 (2
2、013-04) (UMTS); LTE; / (MBMS); (3GPP TS 26.346 11.4.0 11) (ETSI TS 126 346 V11.4.0 (2013-04) Universal Mobile Telecommunications System (UMTS); LTE; Multimedia Broadcast/Multicast Service (MBMS); Protocols and codecs (3GPP TS 26.346 version 11.4.0 Release 11); - ETSI TS 102 472 V1.3.1 (2009-06) (DVB
3、). IP- DVB-H: (ETSI TS 102 472 V1.3.1 (2009-06) Digital Video Broadcasting (DVB); IP Datacast over DVB-H: Content Delivery Protocols); - SMPTE 2022-1 (2007): /- IP- (SMPTE specification 2022-1 (2007): Forward Error Correction for Real-time Video/Audio Transport Over IP Networks). 5 1.02012 ( 8). ( 1
4、 ) , . () . , (gost.ru) , 2014 , 55713 2013 1 DVB IP Digital video broadcasting. Error protection coding for transport of DVB services over IP based networks. Basic parameters 2014 09 01 1 DVB IP . . , DVB IP . 2 : 522102004 . . 525912006 . 535282009 . DSM-CC. 3 : AL-FEC (Application Layer Forward E
5、rror Correction) ; CNAME (Canonical Name) ; CSRC (Contributing Sources List) ; DVB (Digital Video Broadcasting) ; ETSI (European Telecommunications Standards Institute) ; FEC (Forward Error Correction) ; IANA (Internet Assigned Numbers Authority) ; IP (Internet Protocol) ; PT (Payload Type) ; RTCP (
6、Real-time Transport Control Protocol) ; RTP (Real Time Protocol) ; SSRC (Synchronization Source List) ; TS (Timestamp) ; UDP (User Datagram Protocol) . 557132013 2 4 DVB IP AL-FEC. AL-FEC , . . AL-FEC 1. - 2. 4.1 3. 4.1.1 4.1.1.1 RTP/UDP/IP RTP . CSRC (CC) 0. SSRC ( ). RTCP CNAME FEC . . 4.1.2 FEC 4
7、.1.2.1 FEC 1. 1 557132013 3 RTP Pkt xxx RTP ; L ; D ; ( ). , L D , FEC, -. ( ) FEC. N ( N ), FEC N+2. 4.1.2.2 FEC L D, : L D 400; L 40. L D. 4.1.2.3 RTP FEC FEC () 96. SSRC FEC 0. RTCP CNAME FEC . FEC 1 FEC. FEC. 4.1.2.4 FEC FEC 2. 16 16 SNBase TS N D NA . SNBase 1 1 3 3 8 8 8 2 FEC SNBase: , FEC; ,
8、 16 , 16 . : , FEC. : PT , FEC. TS: , FEC. : 1, , . : 0, NA. N: 0. D: 0. : , , 0. . : 0. FEC 0. 557132013 4 : L. FEC. NA: D. FEC. SNBase: . , FEC, n, n = SNBase + j , (1) 0 j NA. 4.1.3 , / , IANA. FEC IP ( ), . FEC UDP , . 4.2 - - : - FEC, FEC ; - FEC, , - . 4.2.1 FEC FEC , FEC UDP. , FEC, : - FEC;
9、- FEC. FEC FEC FEC FEC UDP. FEC FEC. FEC : 1) , UDP ; 2) , ; 3) , UDP, FEC . 4.2.1.1 (SPI) UDP . SPIi () Fi, Li, Ri Pi, i UDP , 0 i n; n UDP ; Fi , fi; fi UDP , UDP , i; Li , li UDP i ( ); 557132013 5 li , UDP i, FEC; Ri UDP UDP i; Pi si T (li + 3), Pi , UDP ; si , si T (li + 3), SPIi T ; T , FEC. SPIi i = 0, 1, 2, n-1. (2) SBN. ESI. ESI ESIj=0 j=0; ESIj= 0 j n, (3) j UDP . 4.2.1.2 FEC FEC 3. IP UDP UDP FEC () 3 FEC IP, UDP FEC , UDP. UDP FEC FEC (). FEC FEC. 4.2.1.3 FEC FEC 4. IP UDP FEC 4 FEC. 557132013 6 FEC FEC.
