1、 ETSI TS 102 472 V1.2.1 (2006-12)Technical Specification Digital Video Broadcasting (DVB);IP Datacast over DVB-H:Content Delivery ProtocolsEuropean Broadcasting Union Union Europenne de Radio-Tlvision EBUUER ETSI ETSI TS 102 472 V1.2.1 (2006-12) 2 Reference RTS/JTC-DVB-202 Keywords broadcasting, dig
2、ital, DVB-H, IP, multimedia 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 but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88 Important notice Individual copies o
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5、 this and other ETSI documents is available at http:/portal.etsi.org/tb/status/status.asp If you find errors in the present document, please send your comment to one of the following services: http:/portal.etsi.org/chaircor/ETSI_support.asp Copyright Notification No part may be reproduced except as
6、authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2006. European Broadcasting Union 2006. All rights reserved. DECTTM, PLUGTESTSTM and UMTSTM are Trade Marks of ETSI registered for the be
7、nefit of its Members. TIPHONTMand the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. 3GPPTM is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI ETSI TS 102 472 V1.2.1 (2006-12) 3 Contents Inte
8、llectual Property Rights7 Foreword.7 Introduction 7 1 Scope 8 2 References 8 3 Definitions and abbreviations.9 3.1 Definitions9 3.2 Abbreviations .10 4 Delivery platform .11 4.1 Protocol stack .12 5 Delivery protocol for real-time streaming services12 5.1 RTP 12 5.2 Streaming session description wit
9、h SDP 12 5.2.1 SDP Parameters for IPDC streaming sessions13 5.2.1.1 Sender IP address 13 5.2.1.2 Destination IP address and port number for channels .13 5.2.1.3 Media description14 5.2.1.4 Session timing parameters.14 5.2.1.5 Service-language(s) per media 14 5.2.1.6 Bandwidth specification14 5.2.2 S
10、DP example for streaming session14 5.3 Hypothetical receiver buffering model.15 5.3.1 Overview of the proposed buffering model (informative)15 5.3.2 MultiProtocol Decapsulation buffer (normative)15 5.3.3 RTP Decapsulation buffer (normative).16 5.3.4 Signalling of Hypothetical Receiver Buffer Model P
11、arameters (normative)16 5.3.5 Conformance requirements (normative) .16 6 Delivery protocol for file delivery services17 6.1 FLUTE .17 6.1.1 FLUTE as a file delivery mechanism .17 6.1.2 Segmentation of files 18 6.1.3 Use of multiple FLUTE channels .18 6.1.4 Symbol encoding algorithm18 6.1.5 Blocking
12、algorithm .18 6.1.6 Congestion control18 6.1.7 Content encoding of files for transport .18 6.1.8 ALC packet size considerations19 6.1.9 Signalling the end of file delivery and end of file delivery session 19 6.1.10 Files that span over several separate file delivery sessions.19 6.1.11 Grouping mecha
13、nisms for FLUTE file delivery .19 6.1.12 File versioning 20 6.1.13 File delivery session description with SDP.20 6.1.13.1 SDP parameters for IPDC file delivery session 20 6.1.13.1.1 Sender IP address 21 6.1.13.1.2 Number of channels.21 6.1.13.1.3 Destination IP address and port number for channels .
14、22 6.1.13.1.4 Transport Session Identifier (TSI) of the session 22 6.1.13.1.5 Session timing parameters.22 6.1.13.1.6 FEC capabilities and related parameters22 6.1.13.1.7 Service-language(s) per media 23 6.1.13.2 Three timers 23 6.1.14 Signalling of parameters with FLUTE23 ETSI ETSI TS 102 472 V1.2.
15、1 (2006-12) 4 6.1.14.1 Signalling of parameters with Basic ALC/FLUTE headers 23 6.1.14.2 Signalling of Parameters with FLUTE Extension Headers .24 6.1.14.3 Signalling of parameters with FDT instances .24 6.1.14.4 Signalling of parameters Out-band .25 6.1.15 FDT schema25 6.2 Download and carousel mec
16、hanisms26 6.2.1 Types of file delivery sessions26 6.2.1.1 Static file delivery session.27 6.2.1.1.1 Definition.27 6.2.1.1.2 Implementation using FLUTE.27 6.2.1.2 Fixed content delivery session 27 6.2.1.2.1 Definition.27 6.2.1.2.2 Implementation using FLUTE.27 6.2.1.3 Dynamic file delivery session .2
17、7 6.2.1.3.1 Definition.27 6.2.1.3.2 Implementation using FLUTE.28 6.2.1.4 Static file delivery carousel.28 6.2.1.4.1 Definition.28 6.2.1.4.2 Implementation using FLUTE.28 6.2.1.5 Dynamic file delivery carousel .28 6.2.1.5.1 Definition.28 6.2.1.5.2 Implementation using FLUTE.29 6.2.2 Session complete
18、ness29 6.2.2.1 Session completeness for fixed content sessions.29 6.2.2.2 Session completeness for static file delivery sessions and static file delivery carousels.30 6.2.2.3 session completeness for dynamic file delivery sessions and dynamic file delivery carousels.30 7 Associated delivery procedur
19、es31 7.1 Introduction 31 7.2 Signalling of associated delivery procedures .32 7.3 File repair mechanisms.32 7.3.1 General procedure.32 7.3.2 Triggering associated delivery procedures for file delivery sessions33 7.3.3 Identification of repair needs 33 7.3.4 Distribution of repair requests over time
20、33 7.3.4.1 Reset of the back-off timer33 7.3.5 Distribution of repair requests over repair servers33 7.3.6 File repair request message.34 7.3.6.1 File repair request message format34 7.3.7 Repair server behaviour 35 7.3.7.1 File repair response message.35 7.3.7.2 File repair response messages codes
21、.36 7.3.7.3 Repair server response message format for HTTP carriage of repair data36 7.3.8 File repair response for broadcast/multicast of repair data .37 7.3.9 Threshold-dependent repair strategy.38 7.3.10 Server Not Responding Error Case.38 7.4 Reception reporting procedure .39 7.4.1 Identifying c
22、omplete file reception from file delivery39 7.4.2 Identifying complete delivery session reception.39 7.4.3 Determining whether a reception report is required .40 7.4.4 Request time selection 40 7.4.5 Reception report server selection41 7.4.6 Reception report message .41 7.4.7 Reception report respon
23、se message 42 7.5 XML-schema for associated delivery procedures 42 7.5.1 Generic associated delivery procedure description.42 7.5.2 Example associatedProcedureDescription instance 43 7.5.3 XML Syntax for a reception report request 43 7.5.4 Example XML for the Reception Report Request 45 8 Applicatio
24、n layer FEC45 8.1 FEC Scheme definition.45 ETSI ETSI TS 102 472 V1.2.1 (2006-12) 5 8.1.1 General45 8.1.2 FEC payload ID 46 8.1.3 FEC Object Transmission Information.46 9 Subtitling 46 9.1 Subtitling using 3GPP Timed Text Format 47 9.1.1 Unicode Support .47 9.1.2 Support for Transparency .47 9.1.3 Te
25、xt position and scaling 47 9.1.4 Optional features.47 9.1.5 Delivery of subtitling text .47 9.1.6 SDP Parameters for IPDC streaming sessions48 9.2 Bitmap based subtitling49 9.2.1 Pixel addressing and scaling of bitmap based subtitles.49 9.2.2 Pixel addressing of non “720 by 576“ subtitles 50 9.2.3 C
26、arriage of DVB subtitle streams over RTP.50 9.2.4 Use of SDP to signal DVB subtitles .51 10 Description of SPP Streams using SDP .51 10.1 Key Stream Message (KSM) Stream51 10.2 Key Management Message (KMM) stream .52 10.3 KSM Stream Binding .52 Annex A (informative): Overview of the blocking algorit
27、hm for FEC encoding id 0 55 Annex B (informative): Algorithm to select repair mechanism for file delivery service .56 Annex C (normative): FEC encoder and decoder specification.58 C.1 Definitions, symbols and abbreviations .58 C.1.1 Definitions58 C.1.2 Symbols59 C.1.3 Abbreviations .59 C.2 Overview
28、60 C.3 File Delivery.60 C.3.1 Source block construction.60 C.3.1.1 General60 C.3.1.2 Source block and sub-block partitioning 61 C.3.2 Encoding packet construction.62 C.3.2.1 General62 C.3.2.2 Encoding packet construction.62 C.3.3 Transport 62 C.3.4 Example Parameters .63 C.3.4.1 Parameter derivation
29、 algorithm.63 C.3.4.2 Examples 64 C.4 Systematic Raptor encoder.64 C.4.1 Encoding overview.64 C.4.2 First encoding step: Intermediate Symbol Generation .64 C.4.2.1 General64 C.4.2.2 Source symbol triples65 C.4.2.3 Pre-coding relationships .65 C.4.2.4 Intermediate symbols66 C.4.2.4.1 Definition 66 C.
30、4.2.4.2 Example method for calculation of intermediate symbols 66 C.4.3 Second encoding step: LT encoding.67 C.4.4 Generators 68 C.4.4.1 Random Generator68 C.4.4.2 Degree Generator68 C.4.4.3 LT Encoding Symbol Generator.68 C.4.4.4 Triple generator 69 C.5 Systematic Indices J(K)69 ETSI ETSI TS 102 47
31、2 V1.2.1 (2006-12) 6 C.6 Random Numbers.70 C.6.1 The table V0.70 C.6.2 The table V1.70 Annex D (informative): Process to handle encrypted services in SPP systems.71 D.1 SDP examples for key streams.71 D.2 Examples for referencing key stream messages in SDP media descriptions71 Annex E (informative):
32、 Example FEC decoder.73 E.1 General .73 E.2 Decoding a source block 73 E.2.1 General73 E.2.2 First phase.74 E.2.3 Second phase 75 E.2.4 Third phase .75 E.2.5 Fourth phase75 History 76 ETSI ETSI TS 102 472 V1.2.1 (2006-12) 7 Intellectual Property Rights IPRs essential or potentially essential to the
33、present document may have been declared to ETSI. The information pertaining to these essential IPRs, if any, is publicly available for ETSI members and non-members, and can be found in ETSI SR 000 314: “Intellectual Property Rights (IPRs); Essential, or potentially Essential, IPRs notified to ETSI i
34、n respect of ETSI standards“, which is available from the ETSI Secretariat. Latest updates are available on the ETSI Web server (http:/webapp.etsi.org/IPR/home.asp). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be given as
35、to the existence of other IPRs not referenced in ETSI SR 000 314 (or the updates on the ETSI Web server) which are, or may be, or may become, essential to the present document. Foreword This Technical Specification (TS) has been produced by Joint Technical Committee (JTC) Broadcast of the European B
36、roadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). Founded in September 1993, the DVB Project is a market-led consortium of public and private sector organizations in the television industry. Its aim is t
37、o establish the framework for the introduction of MPEG-2 based digital television services. Now comprising over 200 organizations from more than 25 countries around the world, DVB fosters market-led systems, which meet the real needs, and economic circumstances, of the consumer electronics and the b
38、roadcast industry. NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co-ordinate the drafting of standards in the specific field of broadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is
39、responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose work includes the co-ordination of its members activities in the technical, legal, programme-making and programme-exchange domains. The EBU has active memb
40、ers in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH-1218 GRAND SACONNEX (Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 Introduction IP Datacast over DVB-H is an end-to-end broadcast system for delivery of any ty
41、pes of digital content and services using IP-based mechanisms optimized for devices with limitations on computational resources and battery. An inherent part of the IPDC system is that it comprises of a unidirectional DVB broadcast path that may be combined with a bi-directional mobile/cellular inte
42、ractivity path. IPDC is thus a platform that can be used for enabling the convergence of services from broadcast/media and telecommunications domains (e.g. mobile / cellular). Harmonization of the IP Datacast over DVB-H content delivery protocols with 3GPP MBMS 1 has been one of the natural goals of
43、 the work. ETSI ETSI TS 102 472 V1.2.1 (2006-12) 8 1 Scope The present document defines a set of Content Delivery Protocols for streaming and file delivery services to be used with IP Datacast over DVB-H 2. Delivery protocols will be IP-based and will be implemented both in content servers and IP Da
44、tacast terminals. The present document includes information applicable to broadcasters, network operators, service providers and manufacturers. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. References are
45、 either specific (identified by date of publication and/or edition number or version number) or non-specific. For a specific reference, subsequent revisions do not apply. For a non-specific reference, the latest version applies. Referenced documents which are not found to be publicly available in th
46、e expected location might be found at http:/docbox.etsi.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 1 ETSI TS 126 346 (V6.1.0): “Universal Mobile Telecommunications System (UMTS); Multimedia B
47、roadcast/Multicast Service (MBMS); Protocols and codecs (3GPP TS 26.346 version 6.5.0 Release 6)“. 2 ETSI EN 302 304: “Digital Video Broadcasting (DVB); Transmission System for Handheld Terminals (DVB-H)“. 3 IETF RFC 3926: “FLUTE - File Delivery over Unidirectional Transport“. 4 ETSI TS 102 005: “Di
48、gital Video Broadcasting (DVB); Specification for the use of Video and audio coding in DVB services delivered directly over IP protocols“. 5 IETF RFC 3550: “RTP: A Transport Protocol for Real-Time Applications“. 6 IETF RFC 2327: “SDP: Session Description Protocol“. 7 IETF RFC 3266: “Support for IPv6
49、 in Session Description Protocol (SDP)“. 8 IETF RFC 3890: “A Transport Independent Bandwidth Modifier for the Session Description Protocol (SDP)“. 9 IETF RFC 3556: “Session Description Protocol (SDP) Bandwidth Modifiers for RTP Control Protocol (RTCP) Bandwidth“. 10 ETSI EN 301 192: “Digital Video Broadcasting (DVB); DVB specification for data broadcasting“. 11 ISO/IEC 13818-1: “Information technology - Generic coding of moving pictures and associated audio information - Part 1: Systems“. 12 IETF RFC 3450: “Asynchronous Layered Coding
