1、INTERNATIONAL TELECOMMUNICATION UNION ITU=T TELECOM M U N I CATI ON STAN DARD I ZATI ON SECT0 R OF ITU J.l I I (03/98) SERIES J: TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS Interactive systems for digital television distribution Network independent protocols for interact
2、ive systems ITU-T Recommendation J.111 (Previously CCITT Recommendation) STD-ITU-T RECMN J-111-ENGL 1998 = 48b2591 Ob119597 23b ITU-T J-SERIES RECOMMENDATIONS TRANSMISSION OF TELEVISION, SOUND PROGRAMME AND OTHER MULTIMEDIA SIGNALS General Recommendations General specifications for analogue sound-pr
3、ogramme transmission Performance characteristics of analogue sound-programme circuits Equipment and lines used for analogue sound-programme circuits Digital encoders for analogue sound-programme signals Digital transmission of sound-programme signals Circuits for analogue television transmission Ana
4、logue television transmission over metallic lines and interconnection with radio-relay links Digital transmission of television signals Ancillary digital services for television transmission Operational requirements and methods for television transmission Transport of MPEG-2 signals on packetised ne
5、tworks Measurement of the quality of service Digital television distribution through local subscriber networks J.l-J.9 J. 1 O-J. 1 9 J.20-J.29 J.30-J.39 J .40-J.49 J.50-J.59 J.60-J.69 5.70-J.79 J.80-J.89 J.90-J.99 J. 100-J. 109 5.110-5.129 J. 130-5.139 J. 140-J. 149 J. 150-1.159 For further details,
6、 please refer to ITU-T List of Recommendations. - - - STD-ITU-T RECMN J-333-ENGL 1998 4862593 0649598 372 ITU-T RECOMMENDATION 5.111 NETWORK INDEPENDENT PROTOCOLS FOR INTERACTIVE SYSTEMS Summary This Recommendation describes protocols independent of the underlying physical and transport protocol for
7、 the support of interaction services based on digital TV broadcast systems. I Source ITU-T Recommendation J. 1 1 1 was prepared by IT-T Study Group 9 (1997-2000) and was approved under the WTSC Resolution No. 1 procedure on the 18th of March 1998. Keywords Digital TV services, Interaction channel, I
8、SDN, PSTN. Recommendation ITU-T 5.111 (03/98) 1 - - FOREWORD ITU (international Telecommunication Union) is the United Nations Specialized Agency in the field of telecommuni- cations. The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of the ITU. The ITU-T is responsible f
9、or studying technical, operating and tariff questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Conference (WTSC), which meets every four years, establishes the topics for study by the IT-T St
10、udy Groups which, in their turn, produce Recommendations on these topics. The approval of Recommendations by the Members of the IT-T is covered by the procedure laid down in WTSC Resolution No. 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are p
11、repared on a collaborative basis with IS0 and IEC. NOTE In this Recommendation, the expression “Administration” is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. INTELLECTUAL PROPERTY RIGHTS The ITU draws attention to the possibility that
12、the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. The ITU takes no position concerning the evidence, validity or applicability of claimed Intellectual Property Rights, whether asserted by IT members or others outside of the Recommenda
13、tion development process. As of the date of approval of this Recommendation, the ITU had not received notice of intellectual property, protected by patents, which may be required to implement this Recommendation. However, implementors are cautioned that this may not represent the latest information
14、and are therefore strongly urged to consult the TSB patent database. O IW 1998 All rights reserved. No part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing fiom the IT. 11 Rec
15、ommendation ITU-T 5.111 (03/98) 1 2 6 STDaITU-T RECMN J-LIIL-ENGL I1998 m 4862591 Ob49b00 b50 m CONTENTS Page Scope 1 References 1 2.1 Nonnative references 1 2.2 Informative references 1 Definitions 2 Abbreviations . 2 Protocol stack and system models 3 5.1 Protocol stack model . 3 5.2 System modeov
16、erview 3 5.3 Logical model . 4 Protocol stacks 5 6.1 S 1 - broadcast or narrowcast content - audio, video, data . 5 6.2 S2 - ACD/ACD and DDC between server and STB 7 6.3 S3 - Session control signalling . 8 PPP data-link Set-up . 9 Network congestion control 9 1.0 Session control in interactive servi
17、ces 9.1 Introduction . 10 9.2 Session establishment 10 9.3 Session release 10 9.4 Status inquiry 10 9.5 Connection reset. . 12 Recommendation ITU-T 5.111 (03198) . 111 - STD-ITU-T RECMN JmLLL-ENGL 1998 m 4862593 0649603 597 m Introduction This Recommendation is one of a series describing interactive
18、 digital TV services. This Recommendation describes protocols independent of the underlying physical and transport protocol for the support of interaction services based on digital TV broadcast systems. Other relevant Recommendations are J.110 which describes the basic principles and J.113 which des
19、cribes the provision of return channel based on PSTN and ISDN. iv Recommendation ITU-T 5.111 (03198) - - - STDmITU-T RECMN J*LIiIi-ENGL 1778 W 4862571 Ob47b02 423 W Recommendation 5.111 NETWORK INDEPENDENT PROTOCOLS FOR INTERACTIVE SYSTEMS (Geneva, 1998) 1 Scope This Recommendation describes protoco
20、ls independent of the underlying physical and transport protocol for the support of interaction services based on digital TV broadcast systems. Other relevant Recommendations are J.110 i which describes the basic principles and J. 1 13 2 which describes the provision of return channel based on PSTN
21、and ISDN. 2 References The following ITU-T Recommendations, and other references contain provisions which, through reference in this text, constitute provisions of this Recommendation. At the time of publication, the editions indicated were valid. All Recommendations and other references are subject
22、 to revision; all users of this Recommendation are therefore encouraged to investigate the possibility of applying the most recent edition of the Recommendations and other references listed below. A list of the currently valid ITU-T Recommendations is regularly published. Normative references IT-T R
23、ecommendation J.110 (1997), Basic principles for a worldwide common family of systems for the provision of interactive television services. IT-T Recommendation J. 1 13 (1 998), Digital video broadcasting interaction channel through the PSTN/ISDN. HEINANEN, (J.): Multiprotocol Encapsulation over ATM
24、Adaptation Layer 5, RFC 1483,20 July 1993. LAUBACK, (M.): Classical IP and ARP over ATM, RFC 1577,20 January 1994. EN 301 192: Specifications for data broadcasting. RFC 1332: The PPP Internet protocol control protocol. RFC 17 17 (MP): The PPP Multilink protocol. ISO/IEC DIS 1381 8-6, Information tec
25、hnology - Generic coding of moving pictures and associated audio information -Part 6: Extensions for DSM-CC. ETR 2 1 1 : Guidelines for the implementation and usage of service information. ETS 300 802: Digital Video Broadcasting; Network-independent protocols for DVB interactive services. RFC 1661 (
26、PPP): The point-to-point protocol. RFC 1994 (CHAP): PPP challenge handshake authentication protocol. RFC 1340: PPP data link layer protocols. RFC 1662: PPP in HDLC-like framing. ITU-T Recommendation J.83 (1 997), Digital multi-programme systems for television, sound and data services for cable distr
27、ibution. Informative references Davic 1.3 : Davic reference model. Recommendation ITU-T 5.111 (03/98) 1 - STD-ITU-T RECMN J*LLL-ENGL 1998 W 4862571 0647603 3bT D 3 Definitions The definitions in Recommendation J. 1 10 i apply. 4 Abbreviations The abbreviations in Recommendation J.110 i apply and are
28、 listed below. AAL ACDIACD API ARP ASN. 1 ATM BER CATV CHAP CPU DAVIC DDC DSM-CC DSM-CC U-N DSM-CC U-U DVB HDLC IEEE IIOP IOR IP IPCP ISDN LCP LLC MAC MATV MIB MMDS MP MFEG MFEG TS ATM Adaptation Layer Application Control Data or Application Communication Data Application Programming Interface Addre
29、ss Resolution Protocol Abstract Syntax Notation One Asynchronous Transfer Mode Basic Encoding Rules Community Antenna Television Challenge Handshake Authentication Protocol Central Processing Unit Digital Audio VIsual Council Data Download Control Digital Storage Media - Command and Control DSM-CC U
30、ser-to-Network DSM-CC User-to-User Digital Video Broadcasting High-level Data Link Control Institute of Electrical and Electronic Engineers (US) Internet Inter-ORB Protocol Interoperable Object Reference Internet Protocol Intemet Protocol Control Protocol Integrated Services Digital Network Link Con
31、trol Protocol Link Layer Control Medium Access Control Master Antenna Television Management Information Base Multipoint Microwave Distribution System Multilink Point-to-Point Protocol (PPP) Moving Pictures Experts Group MPEG Transport Stream 2 Recommendation ITU-T J.111 (03/98) MTU NSAP os1 PAP PPP
32、PSTN RFC RPC RTP SI SIS SMATV SNAP SNMP SRM STB STU TCP UDP UNO-CDR UNO-RPC Multiport Transceiver Unit Network Services Access Point Open Systems Interconnection Password Authentication Protocol Point-to-Point Protocol Public Switched Telephone Network Request For Comments Remote Procedure Call Real
33、 Time Protocol Service Information Systems for Interactive Services Satellite Master Antenna Television Sub-Network Attachment Point Simple Network Management Protocol Session and Resource Manager Set Top Box Set Top Unit Transmission Control Protocol User Datagram Protocol Universal Networked Objec
34、t - Common Data Representation Universal Networked Object - Remote Procedure Call 5 Protocol stack and system models 5.1 Protocol stack model The protocol stack model used for the purposes of this Recommendation consists of the following layers. Physical layer: where all the physical (electrical) tr
35、ansmission parameters are defined - network dependent. Transport layer: defines all the relevant data structures and communication protocols like data containers, etc. - network dependent. Application layer: is the interactive application software and runtime environments - network independent. See
36、Figure 1. This Recommendation describes the network independent protocols only (to layer 4 of the OS1 reference model typically). The network dependent protocols within the transport and physical layers are described in other Recommendations, for example the PSTN/ISDN protocols are described in Reco
37、mmendation J.113 2. 5.2 System modelloverview Refers to Recommendation J.110 i. Recommendation ITU-T 5.111 (03/98) 3 - STD-ITU-T RECMN J.IILII-ENGL II998 D 4862591 0649605 132 D Layer structure for generic system reference model - T0906380-WdOl Proprietary layers Higher medium layers Access mechanis
38、m Packet Structure Modulation Channel Coding Freq. Range Filtering Equalization Power Network independent protocols Network dependent protocols Figure UJ.111- Layer structure for genenc system reference model 5.3 Logical model The broadcast channel carries content fi-om the broadcast service provide
39、r and, in some instances, from the interactive service provider to the user. The broadcast channel may also carry embedded ACD/ACD and/or DDC from the interactive service provider to the user, possibly for controlling an application for which broadcast programme associated data is being supplied by
40、the interactive service provider. Figure 2 shows the mapping of logical channels onto the system model. The interaction channel carries content from the interactive service provider to the user, and may also carry user contribution content back to the interactive service provider. The interaction ch
41、annel also carries ACD/ACD to and from the user, and may also carry DDC to the user. The interactive service provider may also need to send content, either to the broadcast service provider, or to the broadcast network adapter. The latter will require the interactive service provider to send ACD/ACD
42、 andor DDC to the broadcast network adapter for embedding in the broadcast channel. A bidirectional application control and communication channel will also be required between the broadcast service provider and the interactive service provider for synchronization purposes. The network independent pr
43、otocol stacks are derived from the logical channel terminology specified by DAVIC, i.e. S 1 to S5 flows. This terminology is explained in Davic 1.3 1161. 4 Recommendation ITU-T 5.111 (03/98) STD-ITU-T RECMN J.LLL-ENGL 1998 4862591 0649606 079 The following basic realizations of mapping logical strea
44、ms S1, S2 onto the system model are possible as illustrated in Figure 2: a) Broadcast channel carries S1 from broadcast service provider or from interactive service provider to the user; Broadcast channel canies S2 (ACD/ACD and/or DDC) forward to the user; Interaction channel carries S2 backward (AC
45、D/ACD). b) Broadcast channel canies S1 as in a); Interaction channel caries 52 forward (ACD/ACD andor DDC) and S2 backward (ACDIACD). c) Interaction channel carries S 1 from interactive service provider to the user; Interaction channel carries S2 as in b). d) Interaction channel carries S 1 (user co
46、ntribution content) from the user back to the interactive service provider or to the broadcast service provider; Interaction channel carries S2 as in b). e) Store and forward return mode where real time interactivity is not possible. The SIS protocol stacks provide a generic solution for communicati
47、on between a STB and a network. In the case where a direct connection between a STB and an interactive service provider exists, the SIS protocol stacks provide a solution for the STB and the server. Where there is not a direct connection to an interactive service provider (e.g. in traversing multipl
48、e networks), the protocol stack at the server end may be different to the STB stack for the mapping between the iP layer and the underlying physical layer (an example of this is a point-to-point connection from the STB to the first point of presence in the network, with an X.25 connection from the n
49、etwork to the interactive service provider). Note that an exception to the use of PPP is acceptable as an option, in the case of a cable return channel, where IP may be carried over ATM. In this case, LLC/SNAP as defined in RFC 1483 3 shall be used for encapsulating the IP over AALS. The default MTU size shall be 9180 bytes as defined in RFC 1577 4. If another case arises where a PPP link is not used, then an equivalent encapsulation method will be specified as part of the network dependent protocol stack. In ord
