1、 ETSI TS 103 286-1 V1.1.1 (2015-05) Digital Video Broadcasting (DVB); Companion Screens and Streams; Part 1: Concepts, roles and overall architecture TECHNICAL SPECIFICATION ETSI ETSI TS 103 286-1 V1.1.1 (2015-05)2 Reference DTS/JTC-DVB-343-1 Keywords broadcast, companion screen, synchronization, TV
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6、f.aspx Copyright Notification No part may be reproduced or utilized in any form or by 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 o
7、f ETSI. The copyright and the foregoing restriction extend to reproduction in all media. European Telecommunications Standards Institute 2015. European Broadcasting Union 2015. All rights reserved. DECTTM, PLUGTESTSTM, UMTSTMand the ETSI logo are Trade Marks of ETSI registered for the benefit of its
8、 Members. 3GPPTM and LTE are Trade Marks of ETSI registered for the benefit of its Members and of the 3GPP Organizational Partners. GSM and the GSM logo are Trade Marks registered and owned by the GSM Association. ETSI ETSI TS 103 286-1 V1.1.1 (2015-05)3 Contents Intellectual Property Rights 4g3Fore
9、word . 4g3Modal verbs terminology 4g3Introduction 5g31 Scope 6g32 References 6g32.1 Normative references . 6g32.2 Informative references 6g33 Abbreviations . 7g34 Overview 8g34.1 General . 8g34.2 Background 8g34.3 Document structure 8g35 Functional roles, concepts and relationships 8g35.1 General .
10、8g35.2 Concepts . 9g35.2.1 Content and timed content 9g35.2.2 Timelines 9g35.2.3 Companion screen application 9g35.3 Roles . 9g35.3.1 Broadcaster . 9g35.3.2 Delivery Service Provider . 10g35.3.3 Consumer 10g35.4 Devices . 10g35.4.1 TV Device . 10g35.4.2 Companion Device . 11g35.5 Relationship of con
11、cepts, roles and devices . 11g36 General architecture . 11g36.1 Introduction 11g36.2 Companion Services . 12g36.3 Link Proxy 13g36.4 Defined Interfaces 13g37 Interfaces for Content Identification and Media Synchronization . 14g37.1 General . 14g37.1.1 Overview 14g37.1.2 Optionality of specification
12、components 16g37.1.3 Recommendations for profiling 16g37.2 CSS-CII - Content Identification and other Information 17g37.3 CSS-MRS - Material Resolution Service . 18g37.4 CSS-WC - Wall Clock . 20g37.5 CSS-TS - Timeline Synchronization 21g37.6 CSS-TE - Trigger Event . 22g38 Interfaces for Discovery .
13、23g38.1 General . 23g38.2 CSS-DA - Discovery and Association 23g39 Interfaces for indirect communication 24g39.1 General . 24g39.2 CSS-LP - Link Proxy . 24g3History 25g3ETSI ETSI TS 103 286-1 V1.1.1 (2015-05)4 Intellectual Property Rights IPRs essential or potentially essential to the present docume
14、nt 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 E
15、TSI 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 given as to the existence of other IPRs
16、 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), Comit
17、 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 related fields. Since 1995 the JTC Broadcas
18、t 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
19、 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
20、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 t
21、han 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 DVB Companion Screens and Streams Specification, a
22、s identified below: Part 1: “Concepts, roles and overall architecture“; Part 2: “Content Identification and Media Synchronization“; Part 3: “Discovery“. Modal verbs terminology In the present document “shall“, “shall not“, “should“, “should not“, “may“, “need not“, “will“, “will not“, “can“ and “can
23、not“ 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 103 286-1 V1.1.1 (2015-05)5 Introduction The present document
24、 is the first part of a series provides background information to assist in the understanding of subsequent parts. Personal, smart devices like tablet computers and smart phones enable new user experiences for broadcast service consumption. These experiences are built on a range of functionality tha
25、t allow for the connection of the experience on the television and that on the companion device. The present document is the first in a series of specifications that can be used separately or together to provide these new user experiences for the full range of DVB provided broadcast services. The pr
26、esent document describes the key concepts used and the framework within which the other parts of this multi-part deliverable operate and provides an informative descriptive introduction to the interfaces defined in each of the parts. As such it describes various areas: the main functional roles the
27、architectural frameworks the interfaces defined by this multi-part deliverable The present document, and the framework on which it is based, assumes a network in the home to which devices are connected, that this network is in turn connected to the internet, and that services can be provided from th
28、e internet into the home. This allows for the provision of, and use of, services based in the internet that assist the provision of new user experiences. The subsequent parts of this multi-part deliverable provide the details of the interfaces, and provide the further architectural details relevant
29、to the interfaces they define. However, they all work within the generic framework set out within the present document. ETSI ETSI TS 103 286-1 V1.1.1 (2015-05)6 1 Scope The scope of the present document is to describe the framework and architecture used by subsequent parts of this multi-part deliver
30、able that allow for new user experiences through companion devices to be provided to the full set of DVB services. As such, the present document is abstracted from any one delivery mechanism for a DVB service. Where appropriate, subsequent parts of this multi-part deliverable will define the interac
31、tion with a given delivery mechanism for a DVB service. The purpose of the present document is to provide an understanding of the approach taken to support these new user experiences and the setting within which the interfaces have been designed. This represents non-normative background information
32、which assists in the understanding of the subsequent parts of this multi-part deliverable. Therefore, the present document describes concepts, functional roles, overall architecture and the main interfaces defined by this multi-part deliverable that support these new user experiences. The present do
33、cument does not define these interfaces, but informatively describes them, their relationship and their role in the overall architecture. There are various aspects that are out of scope of this multi-part deliverable. Of most relevance are: the mechanisms by which content is delivered, and the role
34、of a third-party companion screen application provider. 2 References 2.1 Normative 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 referenc
35、es, 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.org/Reference. NOTE: While any hyperlinks included in this clause were valid at the time
36、 of publication, ETSI cannot guarantee their long term validity. The following referenced documents are necessary for the application of the present document. Not applicable. 2.2 Informative references References are either specific (identified by date of publication and/or edition number or version
37、 number) or non-specific. For specific references, only the cited version applies. For non-specific references, the latest version of the reference document (including any amendments) applies. NOTE: While any hyperlinks included in this clause were valid at the time of publication, ETSI cannot guara
38、ntee their long term validity. 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 IETF RFC 5905 (June 2010): “Network Time Protocol Version 4: Protocol and Algorithm Specification“, D
39、. Mills, U. Delaware, J. Martin, J.Burbank and W.Kasch. NOTE: Available at http:/www.ietf.org/rfc/rfc5905.txt. i.2 ETSI TS 103 286-2: “Digital Video Broadcasting (DVB); Companion Screens and Streams; Part 2: Content Identification and Media Synchronisation“. NOTE: This document is under development.
40、 The current draft is available at http:/www.dvb.org/resources/public/standards/a167-2.pdf. ETSI ETSI TS 103 286-1 V1.1.1 (2015-05)7 i.3 ETSI TS 103 286-3: “Digital Video Broadcasting (DVB); Companion Screens and Streams; Part 3: Discovery“. NOTE: This document is under development. The current draf
41、t is available at http:/www.dvb.org/resources/public/standards/a167-3.pdf. i.4 IETF RFC 6455 (December 2011): “The WebSocket Protocol“, I. Fette, A. Melnikov. NOTE: Available at http:/www.ietf.org/rfc/rfc6455.txt. i.5 W3C Recommendation 16 January 2014: “Cross-Origin Resource Sharing“. NOTE: Availab
42、le at http:/www.w3.org/TR/cors/. i.6 IETF RFC 2616 (June 1999): “Hypertext Transfer Protocol - HTTP/1.1“, R. Fielding, J. Gettys, J. Mogul, H. Frystyk, L. Masinter, P. Leach, T. Berners-Lee. NOTE: Available at http:/www.ietf.org/rfc/rfc2616.txt. 3 Abbreviations For the purposes of the present docume
43、nt, the following abbreviations apply: CDN Content Delivery Network CoD Content on Demand CORS Cross Origin Resource Sharing CSA Companion Screen Application CSS-CII Interface for Content Identification and other Information CSS-DA Interface for Discovery and Association CSS-LP Interface for Link Pr
44、oxy CSS-MRS Interface for Material Resolution Service CSS-TE Interface for Trigger Events CSS-TS Interface for Timeline Synchronization CSS-WC Interface for Wall Clock DASH Dynamic Adaptive Streaming over HTTP HTTP HyperText Transfer Protocol IP Internet Protocol ISOBMFF ISO Base Media File Format M
45、PD Media Presentation Description MPEG Multimedia Pictures Expert Group MRS Material Resolution Service MSAS Media Synchronization Application Server NTP Network Time Protocol SC Synchronization ClientSTB Set Top Box TV TelevisionURL Universal Resource Locator WC Wall Clock ETSI ETSI TS 103 286-1 V1
46、.1.1 (2015-05)8 4 Overview 4.1 General The various parts that make up this multi-part deliverable provide a complementary set of solutions that can be combined to enable companion devices to support new user experiences for broadcast and Content on Demand (CoD) service consumption. There is no requi
47、rement that all parts be implemented as the parts provide a toolbox of solutions, where such parts as are needed are selected. For instance, it is possible that certain environments may already have functionality covered by a certain part, or require a different solution based on certain specific re
48、quirements. Such environments may select only some parts from this series. Similarly, certain parts of this multi-part deliverable provide a range of functionality and a given environment may choose to make certain parts optional. 4.2 Background In the generic architecture used for this multi-part d
49、eliverable, the presence of internet connections to all devices is assumed. From this assumption, it follows that services can be provided to devices from the internet, e.g. cloud services, and that these services can be used to augment existing broadcast and CoD services. It is outside the scope of this multi-part deliverable whether these services are provided by the broadcaster or a third party, whether they are implemented as dynamic, scalable cloud services, fixed servers, or even fixed values. Whilst some of the interfaces rely on the p
