1、 ETSI TS 102 441 V1.1.1 (2005-10)Technical Specification Digital Video Broadcasting (DVB);DVB-S2 Adaptive Coding and Modulation forBroadband Hybrid Satellite Dialup ApplicationsEuropean Broadcasting Union Union Europenne de Radio-Tlvision EBUUER ETSI ETSI TS 102 441 V1.1.1 (2005-10) 2 Reference DTS/
2、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 but non lucratif enregistre la Sous-Prfecture de Grasse (06) N 7803/88
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8、 441 V1.1.1 (2005-10) 3 Contents Intellectual Property Rights4 Foreword.4 1 Scope 5 2 References 5 3 Abbreviations .5 4 System description .6 4.1 Block description ACM system6 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
9、 ACM_RQ8 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 sections14 6.1.2 ACM messaging multicast and dial-up session control 15 6.2 Session Establishment
10、 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 Stream18 B.2 Multiple Input Stream 18 Annex C (informative): SI and PSI.19 C.1 General .19 C.2 Multiple Transport Streams19 C.3 Multiple
11、Generic Streams.20 C.4 Single Generic Stream20 History 23 ETSI ETSI TS 102 441 V1.1.1 (2005-10) 4 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 avail
12、able 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 serve
13、r (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,
14、 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), Comit Europen de Normalisation ELECtrotechnique (CENELEC) and the European Telecommunications Standar
15、ds 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 i
16、s 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 me
17、mbers 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 privat
18、e 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, an
19、d economic circumstances, of the consumer electronics and the broadcast industry. ETSI ETSI TS 102 441 V1.1.1 (2005-10) 5 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 w
20、ith 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
21、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 Referenc
22、es 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 revisio
23、ns 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 str
24、ucture, 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 technolo
25、gy - 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 (
26、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 V
27、ideo 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 pre
28、sent 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 ETSI TS 102 441 V1.1.1 (2005-10) 6 CNI Carrier to Noise Interference DVB Digital Vid
29、eo Broadcasting DVB-S2 DVB-S system generation as specified in EN 302 307 1 GS Generic StreamGW 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
30、Later Frame for DVB-S2 PPP Point to Point Protocol ST Satellite (receiving) Terminal TBD To Be Determined TS Transport StreamUDP 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
31、 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. Satellite Terminal ACM DVB-S2 MODULATOR Gateway Retu
32、rn channel High bit-rate forward-link SNIR/MODCOD signalling SNIR measurement Modulation 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
33、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
34、 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 cons
35、ist 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 re
36、turn 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 ETSI TS 102 441 V1.1.1 (2005-10) 8 satelliteInternetUser PCUser
37、PCUser PCRS CS TR RD TD CDTALK / DATATALKcvIPPPPHDLC likeV.90typicalIP addr 4IP addr 3IP addr 6IP addr 5IP addr 2IP addr 1ISP POPIPanyIPanycvcvcvRS CS TR RD TD CDTALK / DATATALKRS CS TR RD TD CDTALK / DATATA LKRS CS TR RD TD CDTA LK / DA TATA LKRS CS TR RD TD CDTALK / DATATALKRS CS TR RD TD CDTALK /
38、 DATATALKS2 Uplink StationIPData LinkLayerDVB-S2MPEG2-PRIVATESECTIONMPEG2-TSDVB-S2Data LinkLayerFigure 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
39、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
40、 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 th
41、e 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
42、 connection UDP IP PPP(MP) ETSI ETSI TS 102 441 V1.1.1 (2005-10) 9 Table 2: Protocol structure of ACM_RQ MAC_Address 48 Uimsbf Timestamp 32 Uimsbfpassword_length 16 Uimsbf for (i=0;ipassword_length;i+) Password 8 Uimsbf MODCOD_RQ 8 Uimsbf CNI 8 UimsbfACM_ACK_MODE 8 Uimsbf MAC_Address of the DVB-S2 r
43、eceiver is defined as per IEEE 802.3 4. Timestamp is a time identifier within the User PC. password_length is defined as the number bytes the password is maximum of 16 384 Bytes. If zero, no password authentication is present. Password is defined as a method to authenticate a message at the hub stat
44、ion. The actual method of authentication is open to manufacturer of hub stations and terminals implementing DVB-S2 ACM. MODCOD_RQ is defined in the sections for Signalling of reception quality via return channel (Normative for ACM) of the DVB-S2 system standards 1. CNI is defined in the sections for
45、 Signalling of reception quality via return channel (Normative for ACM) of the DVB-S2 system standards 1. ACM_ACK_MODE is defined on how the hub is to process and reply to this ACM_REQ. Table 3: ACM_ACK_MODE type Value ACM ACK category Meaning of ACM_ACK MODE 0 NONE NO ACM_ACK is sent 1 FLMPEGPS ACM
46、_ACK sent in the forward link using the MPEG Private Sections for real-time processing 2 FLIP ACM_ACK sent in the forward link using UDP 3 RCIP ACM_ACK sent in the return channel using UDP 5.1.2 ACM_ACK This is a response from the ACM_RQ message. This message is required when more than one input str
47、eam is used in the system. There are two options for sending the ACM_ACK message. Satellite Link: The hub station will send the ACM_ACK message over the satellite link when the last IP datagram has been transmitted on the “old“ MODCOD. Table 4: DVB-S2 ACM_ACK via satellite link with MPEG private sec
48、tion MPEG2 Private Section MPEG2 TS The DVB-S2 ACM ACK table consists of sections called dvb_s2_acm_ack_section(), which are private sections as defined in the MPEG-2 Systems standard (see ISO/IEC 13818-1 3). ETSI ETSI TS 102 441 V1.1.1 (2005-10) 10Syntax No. of bits Mnemonic Dvb_s2_acm_ack_section(
49、) table_id 8 Uimsbf Section_syntax_indicator 1 Bslbf Private_indicator 1 Bslbf Reserved 2 Bslbf Section_length 12 Uimsbf MAC_address_6 8 UimsbfMAC_address_5 8 UimsbfReserved 2 Bslbf MODCOD_ACK 8 Uimsbf Input_Stream_Identifier 8 Bslbf Reserved 8 UimsbfMAC_address_4 8 Uimsbf MAC_address_3 8 UimsbfMAC_address_2 8 UimsbfMAC_address_1 8 Uimsbf reply_len 16 Uimsbffor(i=0;i reply_len;i+) Reply 8 Uimsbf Timestamp 32 Uimsbf Checksum 32 Uimsbf table_id is set to 0x81 section_syntax_indicator is set to “0“. private_indicator is set t
