This file is raw output from pdftotext and may not be ideal for distribution. If you are a maintainer for Hackipedia, please sit down when you have time and clean this text version up. Source PDF: /mnt/main/jmc-storage/docs/DVB/TS 102 441 DVB-S2 Adaptive Coding and Modulation for Broadband Hybrid Satellite Dialup Applications (ETSI) V1.1.1 (2005-10).pdf Like all conversions the text below should be fully readable as UTF-8 unicode text. --------------------------------------------------------------- ETSI TS 102 441 V1.1.1 (2005-10) Technical Specification Digital Video Broadcasting (DVB); DVB-S2 Adaptive Coding and Modulation for Broadband Hybrid Satellite Dialup Applications European Broadcasting Union Union Européenne de Radio-Télévision EBU·UER 2 ETSI TS 102 441 V1.1.1 (2005-10) Reference DTS/JTC-DVB-182 Keywords broadcasting, digital, satellite, TV, video 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. 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 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 authorized by written permission. The copyright and the foregoing restriction extend to reproduction in all media. © European Telecommunications Standards Institute 2005. © European Broadcasting Union 2005. All rights reserved. TM TM TM DECT , PLUGTESTS and UMTS are Trade Marks of ETSI registered for the benefit of its Members. TM TIPHON and the TIPHON logo are Trade Marks currently being registered by ETSI for the benefit of its Members. TM 3GPP is a Trade Mark of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. ETSI 3 ETSI TS 102 441 V1.1.1 (2005-10) Contents Intellectual Property Rights ................................................................................................................................4 Foreword.............................................................................................................................................................4 1 Scope ........................................................................................................................................................5 2 References ................................................................................................................................................5 3 Abbreviations ...........................................................................................................................................5 4 System description ...................................................................................................................................6 4.1 Block description ACM system..........................................................................................................................6 4.2 Block description satellite terminal ....................................................................................................................7 4.3 Network topology...............................................................................................................................................7 5 Protocol stack ...........................................................................................................................................8 5.1 Session control signalling...................................................................................................................................8 5.1.1 ACM_RQ......................................................................................................................................................8 5.1.2 ACM_ACK...................................................................................................................................................9 5.2 DVB-S2 ACM MODCOD capability transfer .................................................................................................11 5.2.1 ACM_CAP .................................................................................................................................................11 6 Session control in DVB-S2 ACM interactive services...........................................................................13 6.1 Introduction ......................................................................................................................................................13 6.1.1 ACM messaging Using DVB private sections............................................................................................14 6.1.2 ACM messaging multicast and dial-up session control ..............................................................................15 6.2 Session Establishment ......................................................................................................................................15 6.3 Client initiated session reset .............................................................................................................................16 Annex A (informative): Assumptions for hub station .........................................................................17 Annex B (informative): Input Streams Defined...................................................................................18 B.1 Single Input Stream................................................................................................................................18 B.2 Multiple Input Stream ............................................................................................................................18 Annex C (informative): SI and PSI.......................................................................................................19 C.1 General ...................................................................................................................................................19 C.2 Multiple Transport Streams....................................................................................................................19 C.3 Multiple Generic Streams.......................................................................................................................20 C.4 Single Generic Stream............................................................................................................................20 History ..............................................................................................................................................................23 ETSI 4 ETSI TS 102 441 V1.1.1 (2005-10) Intellectual Property Rights IPRs essential or potentially 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, 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. No 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) Broadcast of the European Broadcasting Union (EBU), Comité Européen 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 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 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 (Geneva) Switzerland 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 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 broadcast industry. ETSI 5 ETSI TS 102 441 V1.1.1 (2005-10) 1 Scope The present document forms the baseline specification for the provision of the DVB-S2 adaptive coding and modulation (DVB-S2 ACM) for GEO satellite interactive networks with dialup return channel terminals. It facilitates the use of such terminals for individual or collective communications in a domestic environment. It also supports the connection of such terminals with in-house satellite forward link and return channel telephone networks. The present document may be applied to all frequency bands allocated to GEO satellite services. The DVB-S2 standard is for forward link transmission. DVB-S2 is the second generation standard for satellite transmission, which provides higher power and bandwidth efficiency as well as adaptive coding and modulation. 2 References The following documents contain provisions which, through reference in this text, constitute provisions of the present document. • References are 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 the expected location might be found at http://docbox.etsi.org/Reference. [1] 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". [2] ETSI EN 300 468: "Digital Video Broadcasting (DVB); Specification for Service Information (SI) in DVB systems". [3] ISO/IEC 13818-1: "Information technology - Generic coding of moving pictures and associated audio: Systems". [4] IEEE 802.3: "Information technology - Telecommunications and information exchange between systems - Local and metropolitan area networks - Specific requirements - Part 3: Carrier Sense Multiple Access with Collision Detection (CSMA/CD) Access Method and Physical Layer Specifications". [5] ETSI TR 102 376: "Digital Video Broadcasting (DVB); User guidelines for the second generation system for Broadcasting, Interactive Services, News Gathering and other broadband satellite applications (DVB-S2)". [6] ETSI EN 301 192: "Digital Video Broadcasting (DVB); DVB specification for data broadcasting". [7] ISO/IEC 13818-6: "Information technology - Generic coding of moving pictures and associated audio information - Part 6: Extensions for Digital Storage Media Command and Control (DSM-CC)". 3 Abbreviations For the purposes of the present document, the following abbreviations apply: ACM Adaptive Coding and Modulation ACM_ACK ACM DVB-S2 ACKnowledgement of ACM_RQ ACM_CAP ACM DVB-S2 CAPabilities List ACM_RQ ACM DVB-S2 REQuest for MODCOD change ETSI 6 ETSI TS 102 441 V1.1.1 (2005-10) CNI Carrier to Noise Interference DVB Digital Video Broadcasting DVB-S2 DVB-S system generation as specified in EN 302 307 [1] GS Generic Stream GW GateWay at hub station IP Internet Protocol ISI Input Stream Identifier ISP Internet Service Provider (Terrestrial) MPEG-2 Motion Picture Experts Group version 2 MSB Most Significant Bit PLFrame Physical Later Frame for DVB-S2 PPP Point to Point Protocol ST Satellite (receiving) Terminal TBD To Be Determined TS Transport Stream UDP Unicast Datagram Packet 4 System description 4.1 Block description ACM system Figure 1 shows the scheme of a generic ACM satellite link from the DVB-S2 User Guideline (see TR 102 376 [5]), composed by the Gateway (GW), which includes the ACM DVB-S2 modulator, the Satellite, the Satellite (receiving) Terminal (ST) connected to the GW via a return channel. In the present document the return channel is a dial-up system. yawetaG ACM DVB-S2 High bit-rate MODULATOR forward-link Modulation & coding SNIR/MODCOD selection signalling source rate control (see note) Satellite Terminal Info Return SOURCE(s) channel SNIR measurement NOTE: Source rate control may be directly applied to source(s) or locally at the GTW inputor via network traffic control. Figure 1: Block diagram of a DVB-S2 ACM link The system is to be used for ACM control messages as per the DVB-S2 system standards [1]. The High bit-rate forward link will transport both MPEG2 Private Sections for physical layer ACM signalling and some IP encapsulation method that may have ACM control messages plus IP traffic. ETSI 7 ETSI TS 102 441 V1.1.1 (2005-10) 4.2 Block description satellite terminal For discussion purposes the Satellite Terminal will consist of three block parts; the Receiver, The User PC, and the Modem. The Receiver functionality should be to process information in the Forward Link and forward onto the User PC. The User PC functionality is to handle IP Traffic but more importantly to ensure the Receiver is optimally tuned (reading CNI and adjusting ISI/MODCOD) to receive traffic by the use of control messages between the User PC and Receiver. Definitions of messaging between the User PC and Receiver are out of scope of the present document and Vendor Specific. The Modem is to send and receive IP traffic via the Return Channel. The Satellite Terminal can consist of one to three individual units and are split in three pieces for clarification. Figure 2: Block diagram of a satellite terminal 4.3 Network topology The satellite terminal network topology will consist of a satellite and dial-up interface. The satellite interface will emulate a network adapter with a unique IP address assigned by the Satellite Network. The dial-up connection will be to an ISP and with a unique IP address assigned by ISP. The ISP is not aware of the Satellite Network and the return channel is to the Internet (not necessarily back to the Satellite Network Operator). The dashed (red) line in the figure below shows the signalling path for DVB-S2 ACM command. The S2 Uplink Station is as defined in figure 1. ETSI 8 ETSI TS 102 441 V1.1.1 (2005-10) IP addr 1 IP addr 2 satellite MPEG2- PRIVATE cv TAL K / D ATA TAL K R S C S TR RD TD CD TA LK / DA TA TA LK RS CS TR R D TD C D SECTION S2 User PC Uplink MPEG2-TS cv Station Data Link Layer IP addr 3 IP addr 4 DVB-S2 TAL K / D ATA TAL K R S C S TR RD TD CD TA LK / DA TA TA LK RS CS TR R D TD C D IP User PC Data Link cv Layer DVB-S2 IP addr 5 IP addr 6 IP any TAL K / D ATA TALK / D ATA TA LK R S CS TR RD TD C D TALK R S C S TR RD TD CD User PC cv Internet IP ISP POP IP any PPP HDLC like typical V.90 Figure 3: Network topology of a DVB-S2 ACM hybrid satellite dialup system This network topology introduces two physical layers both using the same upper layer. This introduces issues related to timing of message delivery, often referred to as race conditions. ACM control messages and traffic delivery need to be synchronized for transparent traffic delivery to not affect TCP/IP performance. 5 Protocol stack 5.1 Session control signalling Session control protocols are normatively required in terminals for DVB-S2 ACM interactive services. The subset of messages required is as follows: Session sequence: ACM_RQ/ACM_ACK For implementation of session control signalling see clause Session Control in DVB-S2 ACM interactive services. 5.1.1 ACM_RQ The Satellite Terminal will send this message whenever the CNI values do not match the thresholds listed in the ACM Capabilities List (ACM_CAP). Return channel: A terminal sends this message over the dial-up connection to the hub station. The message is contained in the payload of a UDP datagram as described in table 1. Table 1: Session control via dialup connection UDP IP PPP(MP) ETSI 9 ETSI TS 102 441 V1.1.1 (2005-10) Table 2: Protocol structure of ACM_RQ MAC_Address 48 Uimsbf Timestamp 32 Uimsbf password_length 16 Uimsbf for (i=0;i