1、 ETSI TS 102 606-1 V1.2.1 (2014-07) Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE); Part 1: Protocol TECHNICAL SPECIFICATION ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)2Reference RTS/JTC-DVB-338-1 Keywords broadcasting, DVB 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 The present document can be downloaded from: http:/www.etsi.org The present document may be made availabl
3、e in electronic versions and/or in print. The content of any electronic and/or print versions of the present document shall not be modified without the prior written authorization of ETSI. In case of any existing or perceived difference in contents between such versions and/or in print, the only pre
4、vailing document is the print of the Portable Document Format (PDF) version kept on a specific network drive within ETSI Secretariat. Users of the present document should be aware that the document may be subject to revision or change of status. Information on the current status of this and other ET
5、SI 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 or utilized in any form or b
6、y any means, electronic or mechanical, including photocopying and microfilm except as authorized by written permission of ETSI. The content of the PDF version shall not be modified without the written authorization of ETSI. The copyright and the foregoing restriction extend to reproduction in all me
7、dia. European Telecommunications Standards Institute 2014. European Broadcasting Union 2014. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its M
8、embers and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)3Contents Intellectual Property Rights 5g3Foreword . 5g3Modal verbs terminology 5g3Introduction 6g31 Scope 7g32 References 7g32.1 N
9、ormative references . 7g32.2 Informative references 8g33 Definitions and abbreviations . 8g33.1 Definitions 8g33.1 Abbreviations . 8g34 Generic Stream Encapsulation (GSE) Protocol 9g34.1 GSE Principles . 9g34.1.1 Fragmentation and Reassembly 10g34.1.2 Network Protocol Identification . 11g34.1.3 Addr
10、essing and Hardware Filtering 11g34.1.4 Locating GSE Streams 11g34.1.5 Transporting Signalling Information 11g34.2 GSE Packet Format 12g34.2.1 Specification . 12g34.2.2 CRC-32 Trailer . 15g34.2.3 GSE Packet Types 16g34.2.4 Data Field Format . 16g34.3 Fragmentation . 17g34.3.1 Rules of operation . 17
11、g34.3.2 Process description . 18g35 Labels: Addresses and Binding 19g36 GSE SI specifications . 20g3Annex A (normative): Receiver Processing . 21g3A.1 Filtering 21g3A.2 Reassembly . 21g3A.3 Protocol Type and Next Header Processing . 22g3A.4 Label re-use 22g3A.5 Padding . 22g3A.6 Hypothetical Receive
12、r Buffer Model . 22g3A.6.1 Physical layer pipe buffer . 23g3A.6.2 GSE de-capsulation buffer . 23g3A.6.3 Header decompression module . 23g3A.6.4 RTP de-capsulation buffer 24g3A.6.5 Re-multiplexing buffer . 24g3A.6.6 Media decoding module . 24g3A.6.7 Decoded data buffer . 25g3A.6.8 Signalling and Requ
13、irements for Hypothetical Receiver Buffer Model Parameters 25g3A.6.8.1 RTP de-capsulation buffer buffering time 25g3A.6.8.2 Minimal RTP de-capsulation buffer size 25g3A.6.8.3 Initial decoded data buffer time 26g3A.6.8.4 Service alternative grouping . 26g3ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)4A.6.8
14、.5 Decoding dependency grouping . 26g3A.6.8.6 Service components synchronization grouping 26g3A.6.9 Example 27g3Annex B (informative): Encapsulator Processing . 28g3B.1 Encapsulator/Scheduler Functions . 28g3B.2 Use of the Label Type Indicator . 30g3Annex C (informative): GSE Packet Format Examples
15、. 31g3Annex D (normative): GSE-Lite Profile . 33g3D.1 Overview 33g3D.2 GSE-Lite Profile Restrictions . 33g3D.2.1 PDU size . 34g3D.2.2 Fragmentation . 34g3Annex E (informative): Bibliography . 35g3History 36g3ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)5Intellectual Property Rights IPRs essential or poten
16、tially 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 Essential,
17、 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:/ipr.etsi.org). Pursuant to the ETSI IPR Policy, no investigation, including IPR searches, has been carried out by ETSI. No guarantee can be g
18、iven 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) Broadcast of the Eu
19、ropean 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 broadcasting and relat
20、ed 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 work includes the c
21、o-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 (Geneva) Switzerland
22、Tel: +41 22 717 21 11 Fax: +41 22 717 24 81 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 to establish the framework for the introduction of MPEG-2 based digital television services. Now compris
23、ing 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 broadcast industry. The present document is part 1 of a multi-part deliverable covering the Generic Stre
24、am Encapsulation (GSE), as identified below: Part 1: “Protocol“; Part 2: “Logical Link Control (LLC)“; Part 3: “Robust Header Compression (ROHC) for IP“. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “may not“, “need“, “need not“, “will“, “will
25、not“, “can“ and “cannot“ are to be interpreted as described in clause 3.2 of the ETSI Drafting Rules (Verbal forms for the expression of provisions). “must“ and “must not“ are NOT allowed in ETSI deliverables except when used in direct citation. ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)6Introduction T
26、he present document includes the definition of the Generic Stream Encapsulation (GSE) protocol, which allows for efficient encapsulation of IP and other network layer packets over a “generic“ physical layer. Such a “generic“ physical layer is intended as a transport mode that carries a sequence of d
27、ata bits or data packets, possibly organized in frames, but with no specific timing constraints. The first generation of DVB standards only supported data transport using the MPEG format (see ISO/IEC 13818-1 4), with a Transport Stream packet multiplex (MPEG-TS). Multi Protocol Encapsulation (EN 301
28、 192 3) is the DVB standard for encapsulation of audio/video 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 for carrying arbitrary packets of variable length. These are referred to as G
29、eneric Streams (GS). The GSE protocol has been devised as an adaptation layer to provide network layer packet encapsulation and fragmentation functions over Generic Stream. GSE provides efficient encapsulation of IP datagrams over variable length Layer 2 packets, which are then directly scheduled on
30、 the physical layer into Base Band frames. GSE maximizes efficiency of IP datagrams transport reducing overhead by a factor 2 to 3 with respect to MPE over MPEG-TS. This is achieved without any compromise of the functionalities provided by the protocol, due to the variable length Layer 2 packet size
31、, suited to IP traffic characteristics. For example in an interactive DVB-S2 system, the overhead is reduced on average from about 10 % for MPE/MPEG-TS to 2 % to 3 % for GSE. Hence yielding an overall throughput gain of about 5 % to 15 %, the actual benefit is of course dependent on the concrete sys
32、tem and traffic characteristics. In addition to the overhead reduction, GSE provides a more efficient system operation for interactive systems that utilize advanced physical layer techniques such as for instance Adaptive Coding and Modulation (ACM). The inherent channel rate variability experienced
33、in ACM systems makes the Generic Stream format more suited than the Transport Stream. GSE provides a flexible fragmentation and encapsulation method, which permits use of a smart scheduler to optimize system performance, either by increasing the total throughput and/or by improving the average packe
34、t end-to-end delay. In addition, GSE flexibility leads to a reduction in packet loss under fading variations, allowing the scheduler at the transmitter to dynamically change transmission parameters (for example modulation format, coding rate) for a particular network layer packet. GSE also provides
35、additional features that increase the protocol flexibility and applicability. Some key GSE functions/characteristics are: Support for multi-protocol encapsulation (IPv4, IPv6, MPEG, ATM, Ethernet, 802.1pQ VLANs, etc.). Transparency to network layer functions, including IP encryption and IP header co
36、mpression. Support of several addressing modes: In addition to the 6-byte MAC address (including multicast and unicast), it supports a MAC addressless mode, and an optional 3-byte address mode. A mechanism for fragmenting IP datagrams or other network layer packets over Base Band frames to support A
37、CM/VCM. Support for hardware filtering. Extensibility: additional link protocols can be included through specific protocol type values (e.g. Layer 2 security, IP Header Compression, etc.). Low complexity. ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)71 Scope The present document specifies the Generic Stre
38、am Encapsulation (GSE) protocol. 2 References References are either specific (identified by date of publication and/or edition number or version number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the referenced documen
39、t (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.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guarantee their lo
40、ng term validity. 2.1 Normative references The following referenced documents are necessary for the application of the present document. 1 ETSI EN 302 307: “Digital Video Broadcasting (DVB); Second generation framing structure, channel coding and modulation systems for Broadcasting, Interactive Serv
41、ices, News Gathering and other broadband satellite applications (DVB-S2)“. 2 ETSI EN 302 755: “Digital Video Broadcasting (DVB); Frame structure channel coding and modulation for a second generation digital terrestrial television broadcasting system (DVB-T2)“. 3 ETSI EN 301 192: “Digital Video Broad
42、casting (DVB); DVB specification for data broadcasting“. 4 ISO/IEC 13818-1: “Information technology - Generic coding of moving pictures and associated audio information: Systems“. 5 IETF RFC 4326: “Unidirectional Lightweight Encapsulation (ULE) for Transmission of IP Datagrams over an MPEG-2 Transpo
43、rt Stream (TS)“. 6 IETF RFC 3819: “Advice for Internet Subnetwork Designers“. 7 IETF RFC 1112: “Host extensions for IP multicasting“. 8 IETF RFC 2464: “Transmission of IPv6 Packets over Ethernet Networks“. 9 IETF RFC 5163: “Extension Formats for Unidirectional Lightweight Encapsulation (ULE) and the
44、 Generic Stream Encapsulation (GSE)“. 10 IETF RFC 3095: “RObust Header Compression (ROHC): Framework and four profiles: RTP, UDP, ESP, and uncompressed“. 11 IETF RFC 5888: “The Session Description Protocol (SDP) Grouping Framework“. 12 IETF RFC 5583: “Signaling Media Decoding Dependency in the Sessi
45、on Description Protocol (SDP)“. 13 IETF RFC 4566: “SDP: Session Description Protocol“. ETSI ETSI TS 102 606-1 V1.2.1 (2014-07)82.2 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 particu
46、lar subject area. i.1 Void. i.2 ETSI TS 102 606-3: “Digital Video Broadcasting (DVB); Generic Stream Encapsulation (GSE); Part 3: Robust Header Compression (ROHC) for IP“. 3 Definitions and abbreviations 3.1 Definitions For the purposes of the present document, the following terms and definitions ap
47、ply: fragmentation: splitting PDU and Extension Header data over two or more GSE Packets slicing: splitting a GSE packet over two or more contiguous physical layer frames 3.1 Abbreviations For the purposes of the present document, the following abbreviations apply: ABNF Augmented BackusNaur Form ACM
48、 Adaptive Coding and Modulation ADU Application Data Unit AM Adapter Module ATM Asynchronous Transfer Mode BB Base Band CRC Cyclic Redundancy Check DDB Decoded Data Buffer DVB Digital Video Broadcast E End indicator EBU European Broadcasting Union GDB GSE De-capsulation Buffer GS Generic Stream GSE
49、Generic Stream Encapsulation HDM Header Decompression Module HEM High Efficiency Mode HRBM Hypothetical Receiver Buffer Model IANA Internet Assigned Numbers Authority IEEE Institute of Electrical and Electronics Engineers IETF Internet Engineering Task Force IP Internet Protocol IPR Intellectual Property Rights IR Initialization and Refresh IR-DYN IR Dynamic (i.e. without static information) ISO International Standard Organization JTC Joint Technical Committee LLC Logical Link Control LT Label Type indicator MAC Medium Ac
