ETSI TR 102 993 V1.1.1 (2011-02) Technical Report Digital Video Broadcasting (DVB); Upper Layer FEC for DVB Systems 2 ETSI TR 102 993 V1.1.1 (2011-02) Reference DTR/JTC-DVB-285 Keywords application layer, DVB, FEC, upper layer ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex - FRANCE Tel.: +33 4 92 94 42 00 Fax: +33 4 93 65 47 16 Siret N° 348 623 562 00017 - NAF 742 C Association à but non lucratif enregistrée à la Sous-Préfecture de Grasse (06) N° 7803/88 Important notice Individual copies of the present document can be downloaded from: http://www.etsi.org The present document may be made available in more than one electronic version or in print. In any case of existing or perceived difference in contents between such versions, the reference version is the Portable Document Format (PDF). In case of dispute, the reference shall be the printing on ETSI printers of the PDF version kept on a specific network drive within ETSI Secretariat. 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ETSI 3 ETSI TR 102 993 V1.1.1 (2011-02) Contents Intellectual Property Rights ................................................................................................................................ 6 Foreword ............................................................................................................................................................. 6 1 Scope ........................................................................................................................................................ 7 2 References ................................................................................................................................................ 7 2.1 Normative references ......................................................................................................................................... 7 2.2 Informative references ........................................................................................................................................ 7 3 Abbreviations ......................................................................................................................................... 11 4 Introduction ............................................................................................................................................ 13 4.1 Why upper layer FEC? ..................................................................................................................................... 13 4.2 Definition of upper layer FEC .......................................................................................................................... 15 5 Use case upper layer FEC ...................................................................................................................... 15 5.1 Unidirectional File Delivery ............................................................................................................................. 15 5.2 Streaming TV Services ..................................................................................................................................... 17 5.3 Streaming Layered Error Protection ................................................................................................................. 18 5.3.1 Support of heterogeneous devices and conditional access .......................................................................... 18 5.3.2 Extended service coverage and graceful degradation behaviour ................................................................ 19 5.3.3 Layered Error Protection ............................................................................................................................ 19 5.4 Mobile Data Services over Satellite ................................................................................................................. 20 6 DVB specifications including Upper Layer FEC ................................................................................... 21 6.1 Introduction ...................................................................................................................................................... 21 6.2 MPE-FEC ......................................................................................................................................................... 21 6.3 MPE-IFEC ........................................................................................................................................................ 22 6.4 Link Layer FEC in DVB RCS+M .................................................................................................................... 22 6.5 AL-FEC in IPDC for File Delivery .................................................................................................................. 23 6.6 AL-FEC in DVB-IPTV for Streaming ............................................................................................................. 23 6.7 AL-FEC in DVB-IPTV for Content Download Services ................................................................................. 24 7 FEC codes for Upper Layer FEC ........................................................................................................... 25 7.1 Metrics for UL-FEC codes ............................................................................................................................... 25 7.1.1 Reception overhead and failure probability ................................................................................................ 25 7.1.2 Encoding and decoding memory requirements ........................................................................................... 25 7.1.3 Encoding and decoding speeds ................................................................................................................... 25 7.1.4 Sensitivity to packet loss ............................................................................................................................. 25 7.1.5 Range of applicable source blocks .............................................................................................................. 25 7.2 Performance Ideal Code ................................................................................................................................... 25 7.3 Reed-Solomon Codes ....................................................................................................................................... 26 7.3.1 Overview .................................................................................................................................................... 26 7.3.2 Specification ............................................................................................................................................... 26 7.3.3 Memory Requirements ............................................................................................................................... 26 7.3.4 Additional Information ............................................................................................................................... 27 7.4 Raptor Codes .................................................................................................................................................... 27 7.4.1 Overview .................................................................................................................................................... 27 7.4.2 Specification ............................................................................................................................................... 28 7.4.3 Memory Requirements ............................................................................................................................... 28 7.4.4 Additional Information ............................................................................................................................... 28 7.5 Comparison of Codes ....................................................................................................................................... 29 8 Basic Design Considerations .................................................................................................................. 29 8.1 UL-FEC Database ............................................................................................................................................ 29 8.1.1 Exogenous Aspects ....................................................................................................................................