1、 ETSI TS 102 771 V1.2.1 (2011-05)Technical Specification Digital Video Broadcasting (DVB);Generic Stream Encapsulation (GSE)implementation guidelinesETSI ETSI TS 102 771 V1.2.1 (2011-05)2Reference RTS/JTC-DVB-299 Keywords digital, DVB, TV ETSI 650 Route des Lucioles F-06921 Sophia Antipolis Cedex -
2、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 of the present document can be downloaded from: http:/www.etsi.org The present document ma
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8、SI ETSI TS 102 771 V1.2.1 (2011-05)3Contents Intellectual Property Rights 5g3Foreword . 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 7g33 Abbreviations . 7g34 Requirements for GSE definition . 9g35 System scenarios for GSE applicability . 9g35.1 Interactive
9、DVB-S2 system with terrestrial return channel 10g35.2 Interactive DVB-S2 system with satellite return channel (DVB-RCS) for broadband access . 10g35.3 DVB-S2 system for professional applications 11g35.4 General broadcasting (unidirectional) of IPTV using DVB-S2 system 12g36 GSE implementation 12g36.
10、1 Implementation and use of advanced GSE features . 12g36.1.1 Multiple addressing format support 12g36.1.1.1 6-Byte label (default format) . 12g36.1.1.2 No label . 13g36.1.1.3 Label re-use . 13g36.1.1.4 3-Byte label. 13g36.1.2 GSE Extension Header . 15g36.1.3 Fragmentation Identifier (Frag ID) Manag
11、ement . 16g36.2 Simple transmitter for CCM . 18g36.3 Transmitter with support for ACM/VCM operation and QoS management 18g36.4 Receiver 22g36.4.1 Receiver profiles . 23g37 Locating GSE streams 24g37.1 “Mixed“ system (TS and GS) . 24g37.2 “Generic Stream only“ system 26g38 Physical layer requirements
12、 for GSE applicability 27g38.1 Reliability requirements . 27g38.2 Physical layer Fragmentation . 27g38.3 Frame format requirements 28g38.3.1 Start of the first GSE packet . 28g38.3.2 Frame size requirements . 29g38.4 Padding . 29g38.5 GSE packets no re-ordering 29g38.6 Signalling requirements 29g39
13、DVB-S2 systems 30g39.1 Reliability . 30g39.1.1 Reliability in constant coding modes 30g39.1.2 Reliability in adaptive coding modes 30g39.2 Frame format 30g39.2.1 Frame format for constant coding modes . 30g39.2.2 Frame format for adaptive coding modes . 31g39.3 Input Stream Identifier (ISI) . 32g39.
14、4 Signalling . 32g3Annex A (normative): GSE performances over DVB-S2 satellite links 33g3A.1 Assessment assumptions and scenarios 33g3ETSI ETSI TS 102 771 V1.2.1 (2011-05)4A.2 Performances results. 35g3History 36g3ETSI ETSI TS 102 771 V1.2.1 (2011-05)5Intellectual Property Rights IPRs essential or p
15、otentially essential to the 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 Essent
16、ial, IPRs notified to ETSI in 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. N
17、o guarantee can be given as 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)
18、 Broadcast of the European Broadcasting Union (EBU), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standards Institute (ETSI). NOTE: The EBU/ETSI JTC Broadcast was established in 1990 to co ordinate the drafting of standards in the specific field of br
19、oadcasting and related fields. Since 1995 the JTC Broadcast became a tripartite body by including in the Memorandum of Understanding also CENELEC, which is responsible for the standardization of radio and television receivers. The EBU is a professional association of broadcasting organizations whose
20、 work includes the co ordination of its members activities in the technical, legal, programme making and programme exchange domains. The EBU has active members in about 60 countries in the European broadcasting area; its headquarters is in Geneva. European Broadcasting Union CH 1218 GRAND SACONNEX (
21、Geneva) Switzerland Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 The Digital Video Broadcasting Project (DVB) is an industry-led consortium of broadcasters, manufacturers, network operators, software developers, regulatory bodies, content owners and others committed to designing global standards for
22、the delivery of digital television and data services. DVB fosters market driven solutions that meet the needs and economic circumstances of broadcast industry stakeholders and consumers. DVB standards cover all aspects of digital television from transmission through interfacing, conditional access a
23、nd interactivity for digital video, audio and data. The consortium came together in 1993 to provide global standardisation, interoperability and future proof specifications. ETSI ETSI TS 102 771 V1.2.1 (2011-05)61 Scope The present document gives guidelines for the implementation of the Generic Stre
24、am Encapsulation (GSE) Protocol. The guidelines are intended to be recommended rules, advice and good practices for the usage of the GSE specifications defined in TS 102 606 1, in order to assist systems integrators and equipment manufacturers. As such, they aim at facilitating the efficient and rel
25、iable implementation of GSE. Outline of the present document The present document: provides examples of system scenarios where GSE is applicable, with recommendations and advice for using specific GSE features for each scenario; provides extensive details about the use and implementation of advanced
26、 GSE features, and proposes transmitter and receiver functional architectures; addresses the use of the DVB signalling to locate GSE streams; presents the physical layer requirements assumed by GSE; specifies the use of GSE as an encapsulation protocol for physical layers. GSE was initially devised
27、for efficiently carrying IP data over DVB-S2 Generic Stream, however it provides a generic encapsulation mechanism potentially applicable to other second generation DVB standards. As a consequence, future revisions may provide new clauses referring to other second generation DVB standards not addres
28、sed in the present document. Updates to the present document will be produced when more results from GSE compliant implementation tests and experience become available. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-spec
29、ific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. Referenced documents which are not found to be publicly available in the expected location might be found at http:/docbox.etsi.
30、org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication ETSI cannot guarantee their long term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ETSI TS 102 606: “Digital V
31、ideo Broadcasting (DVB); Generic Stream Encapsulation (GSE) Protocol“. 2 ETSI EN 302 307: “Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (D
32、VB-S2)“. 3 ETSI EN 301 790: “Digital Video Broadcasting (DVB); Interaction channel for satellite distribution systems“. 4 ISO/IEC 13818 (parts 1 and 2): “Information technology - Generic coding of moving pictures and associated audio information“. ETSI ETSI TS 102 771 V1.2.1 (2011-05)75 ETSI EN 301
33、192: “Digital Video Broadcasting (DVB); DVB specification for data broadcasting“. 6 ETSI EN 300 468: “Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems“. 7 IETF RFC 4326 (2005): “Unidirectional Lightweight Encapsulation (ULE) for Transmission of IP Datagrams
34、 over an MPEG-2 Transport Stream (TS)“. 8 IETF RFC 1112 (1989): “Host extensions for IP multicasting“. 9 IETF RFC 2464 (1998): “Transmission of IPv6 Packets over Ethernet Networks“. 10 J. Cantillo, B. Collini-Nocker, U. De Bie, O. Del Rio, G. Fairhust, A. Jahn, R. Rinaldo, “GSE: A Flexible, yet Effi
35、cient, Encapsulation for IP over DVB-S2 Continuous Generic Streams“, International Journal of Satellite Communications and Networking, 2008. NOTE: GSE Assessment analysis was performed by TriaGnoSis (O.Lcke, A, Jahn) under ESA contract 17403/03. 11 IEEE Std. 802.1Q-2005: “IEEE Standard for Local and
36、 Metropolitan Area Networks - Virtual Bridged Local Area Networks“. NOTE: See ISBN 0-7381-3662-X. 12 IETF RFC 5163 (2008): “Extension Formats for Unidirectional Lightweight Encapsulation (ULE) and the Generic Stream Encapsulation (GSE)“. 13 Unidirectional Lightweight Encapsulation (ULE) Next-Header
37、Registry. NOTE: Available at http:/www.iana.org/assignments/ule-next-headers. 2.2 Informative references The following referenced documents are not necessary for the application of the present document but they assist the user with regard to a particular subject area. i.1 Juan Cantillo, “Cross-Layer
38、 Optimization Techniques for Satellite Communications Networks“, PhD Thesis, ENST, May 2008. NOTE: available at http:/pastel.archives-ouvertes.fr/docs/00/50/12/26/PDF/PHD_JUAN_CANTILLO_FINAL.pdf. 3 Abbreviations For the purposes of the present document, the following abbreviations apply: ACM Adaptiv
39、e Coding and Modulation ADSL Asymmetric Digital Subscriber Line AF Assured Forwarding traffic ATM Asynchronous Transfer Mode BB Base Band BCH Bose-Chaudhuri-Hocquenghem multiple error correction binary block code BE Best Effort traffic CCM Constant Coding and Modulation CRC Cyclic Redundancy Check D
40、iffServ Differentiated Services DRR Deficit Round Robin DSCP Differentiated Services Code Point DVB Digital Video Broadcasting DVB-S2 Digital Video Broadcasting - Satellite - Second Generation E End indicator EBU European Broadcasting Union ETSI ETSI TS 102 771 V1.2.1 (2011-05)8EF Expedited Forwardi
41、ng traffic EPU Encapsulated Packet Unit FEC Forward Error Correction FER Frame Error Rate FIFO First In First Out FragID Fragmentation Identifier GARP Generic Attribute Registration Protocol GS Generic Stream GSE Generic Stream Encapsulation GVRP GARP VLAN Registration Protocol IANA Internet Assigne
42、d Numbers Authority ID Identity IEEE The Institute of Electrical and Electronics Engineers IETF The Internet Engineering Task Force INT IP/MAC Notification Table IntServ Integrated Services IP Internet ProtocolIPR Intellectual Property Right IPTV Internet Protocol Television IRD Integrated Receiver
43、Decoder ISDN Integrated Services Digital Network ISI Input Stream Identifier ISO International Standard Organisation ISP Internet Service Provider JTC Joint Technical Committee LAN Local Area Network LDPC Low Density Parity Check MAC Medium Access Control MODCOD MODulation and CODing MPE Multi Proto
44、col Encapsulation MPEG Moving Pictures Experts Group NH Next Header NIT Network Information Table NPA Network Point of Attachment PDU Protocol Data Unit PEP Performance Enhancing Proxy PID Programme Identifier PL Physical LayerPOTS Plain Old Telephone Service PPPoE PPP over Ethernet PSI Program Spec
45、ific Information QoS Quality of Service RCS Return Channel Satellite RFC Request For Comments (IETF standard) S Start indicator SI Service Information TS Transport StreamUDP User Datagram Protocol ULE Unidirectional Lightweight Encapsulation UPL User Packet Length VCI Virtual Channel Identifier VCM
46、Variable Coding and Modulation VDSL Very high rate Digital Subscriber Line VLAN Virtual LAN VPI Virtual Path Identifier ETSI ETSI TS 102 771 V1.2.1 (2011-05)94 Requirements for GSE definition The first generation of DVB standards only supports audio/video transport using the MPEG format 4 with a Tra
47、nsport Stream packet multiplex (MPEG-TS). Multi Protocol Encapsulation (EN 301 192 5) is the DVB standard for the encapsulation of data and other content on MPEG-TS packets. The second generation of DVB standards features backwards compatibility modes for carrying MPEG-TS, as well as generic modes f
48、or carrying arbitrary packets of variable length. These are referred to as Generic Streams (GS). Such Generic Streams are intended to transport a sequence of data bits or data packets, possibly organized in frames, but with no specific timing/rate constraints. GSE was initially devised for DVB-S2 2
49、Generic Streams. It was introduced to improve the efficiency of carriage of IP data (and other network and link-layer packets) over DVB-S2 Generic Streams. This clause recalls the requirements which led to the definition of GSE: NOTE 1: These requirements were discussed during the 71th DVB-GBS meeting. The IP/DVB-S2 protocol shall implement a more efficient encapsulation of IP over DVB-S2 than IP/MPEG-TS using Multi-Protocol-Encapsulation. Given the very large weight of satellite segment cost, IP packets shall be mapped
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