1、 I n t e r n a t i o n a l T e l e c o m m u n i c a t i o n U n i o n ITU-T H.724 TELECOMMUNICATION STANDARDIZATION SECTOR OF ITU (12/2017) SERIES H: AUDIOVISUAL AND MULTIMEDIA SYSTEMS IPTV multimedia services and applications for IPTV IPTV terminal devices IPTV terminal device: Interworking-enable
2、d model of multiple devices Recommendation ITU-T H.724 ITU-T H-SERIES RECOMMENDATIONS AUDIOVISUAL AND MULTIMEDIA SYSTEMS CHARACTERISTICS OF VISUAL TELEPHONE SYSTEMS H.100H.199 INFRASTRUCTURE OF AUDIOVISUAL SERVICES General H.200H.219 Transmission multiplexing and synchronization H.220H.229 Systems a
3、spects H.230H.239 Communication procedures H.240H.259 Coding of moving video H.260H.279 Related systems aspects H.280H.299 Systems and terminal equipment for audiovisual services H.300H.349 Directory services architecture for audiovisual and multimedia services H.350H.359 Quality of service architec
4、ture for audiovisual and multimedia services H.360H.369 Telepresence H.420H.429 Supplementary services for multimedia H.450H.499 MOBILITY AND COLLABORATION PROCEDURES Overview of Mobility and Collaboration, definitions, protocols and procedures H.500H.509 Mobility for H-Series multimedia systems and
5、 services H.510H.519 Mobile multimedia collaboration applications and services H.520H.529 Security for mobile multimedia systems and services H.530H.539 Security for mobile multimedia collaboration applications and services H.540H.549 VEHICULAR GATEWAYS AND INTELLIGENT TRANSPORTATION SYSTEMS (ITS) A
6、rchitecture for vehicular gateways H.550H.559 Vehicular gateway interfaces H.560H.569 BROADBAND, TRIPLE-PLAY AND ADVANCED MULTIMEDIA SERVICES Broadband multimedia services over VDSL H.610H.619 Advanced multimedia services and applications H.620H.629 Ubiquitous sensor network applications and Interne
7、t of Things H.640H.649 IPTV MULTIMEDIA SERVICES AND APPLICATIONS FOR IPTV General aspects H.700H.719 IPTV terminal devices H.720H.729 IPTV middleware H.730H.739 IPTV application event handling H.740H.749 IPTV metadata H.750H.759 IPTV multimedia application frameworks H.760H.769 IPTV service discover
8、y up to consumption H.770H.779 Digital Signage H.780H.789 E-HEALTH MULTIMEDIA SERVICES AND APPLICATIONS Personal health systems H.810H.819 Interoperability compliance testing of personal health systems (HRN, PAN, LAN, TAN and WAN) H.820H.859 Multimedia e-health data exchange services H.860H.869 For
9、further details, please refer to the list of ITU-T Recommendations. Rec. ITU-T H.724 (12/2017) i Recommendation ITU-T H.724 IPTV terminal device: Interworking-enabled model of multiple devices Summary Recommendation ITU-T H.724 describes the functional components and features that enable the interwo
10、rking amongst the Internet Protocol television (IPTV) terminal devices defined in Recommendations ITU-T H.721, ITU-T H.722 and ITU-T H.723. ITU-T H.724 complements the specifications of the basic, full-fledged and mobile terminal device models of those Recommendations by specifying the capabilities
11、and functions needed in an IPTV terminal device to enable services or content consumption over multiple IPTV terminal devices. These capabilities and functions include the interworking models, functional roles, application framework, application programming interfaces (APIs), and physical and logica
12、l interfaces. In addition, the appendices describe use cases for the interworking models and various multi-device synchronization schemes. History Edition Recommendation Approval Study Group Unique ID* 1.0 ITU-T H.724 2017-12-14 16 11.1002/1000/13437 Keywords IPTV, interworking, multiple terminal de
13、vices, terminal device. * To access the Recommendation, type the URL http:/handle.itu.int/ in the address field of your web browser, followed by the Recommendations unique ID. For example, http:/handle.itu.int/11.1002/1000/11830-en. ii Rec. ITU-T H.724 (12/2017) FOREWORD The International Telecommun
14、ication Union (ITU) is the United Nations specialized agency in the field of telecommunications, information and communication technologies (ICTs). The ITU Telecommunication Standardization Sector (ITU-T) is a permanent organ of ITU. ITU-T is responsible for studying technical, operating and tariff
15、questions and issuing Recommendations on them with a view to standardizing telecommunications on a worldwide basis. The World Telecommunication Standardization Assembly (WTSA), which meets every four years, establishes the topics for study by the ITU-T study groups which, in turn, produce Recommenda
16、tions on these topics. The approval of ITU-T Recommendations is covered by the procedure laid down in WTSA Resolution 1. In some areas of information technology which fall within ITU-Ts purview, the necessary standards are prepared on a collaborative basis with ISO and IEC. NOTE In this Recommendati
17、on, the expression “Administration“ is used for conciseness to indicate both a telecommunication administration and a recognized operating agency. Compliance with this Recommendation is voluntary. However, the Recommendation may contain certain mandatory provisions (to ensure, e.g., interoperability
18、 or applicability) and compliance with the Recommendation is achieved when all of these mandatory provisions are met. The words “shall“ or some other obligatory language such as “must“ and the negative equivalents are used to express requirements. The use of such words does not suggest that complian
19、ce with the Recommendation is required of any party. INTELLECTUAL PROPERTY RIGHTSITU draws attention to the possibility that the practice or implementation of this Recommendation may involve the use of a claimed Intellectual Property Right. ITU takes no position concerning the evidence, validity or
20、applicability of claimed Intellectual Property Rights, whether asserted by ITU members or others outside of the Recommendation development process. As of the date of approval of this Recommendation, ITU had not received notice of intellectual property, protected by patents, which may be required to
21、implement this Recommendation. However, implementers are cautioned that this may not represent the latest information and are therefore strongly urged to consult the TSB patent database at http:/www.itu.int/ITU-T/ipr/. ITU 2018 All rights reserved. No part of this publication may be reproduced, by a
22、ny means whatsoever, without the prior written permission of ITU. Rec. ITU-T H.724 (12/2017) iii Table of Contents Page 1 Scope . 1 2 References . 1 3 Definitions 1 3.1 Terms defined elsewhere 1 3.2 Terms defined in this Recommendation . 2 4 Abbreviations and acronyms 2 5 Conventions 3 6 Introductio
23、n . 4 7 Services and key features of interworking among IPTV terminal devices 6 7.1 IPTV service over multiple terminal devices . 6 7.2 Features of multiple interworking terminal devices . 6 7.3 Application framework . 11 7.4 Functional roles supported by IPTV terminal devices . 12 7.5 Multi-device
24、enabler APIs 15 8 Functional components for interworking between IPTV terminal devices 16 9 Interfaces . 18 9.1 Physical interfaces 18 9.2 Logical interface for multi-device application . 20 9.3 Protocols for the logical interface . 20 10 Security module 22 10.1 Home network security . 22 10.2 Syste
25、m security . 22 Appendix I Use cases for the interactive model . 23 I.1 Sharing an EPG over multiple terminal devices . 23 I.2 Remote control over multiple terminal devices 23 I.3 Sharing media files/streams over multiple terminal devices 24 I.4 Consuming extra content on multiple terminal devices .
26、 25 I.5 Requirements mapping on scenarios 25 I.6 Mapping between service scenarios and interwork instances 26 Appendix II Multi-device synchronization schema 28 II.1 Master-slave control . 28 II.2 Maestro-based control 28 II.3 Distributed control 29 II.4 Hierarchical control 29 Bibliography. 30 Rec.
27、 ITU-T H.724 (12/2017) 1 Recommendation ITU-T H.724 IPTV terminal device: Interworking-enabled model of multiple devices 1 Scope This Recommendation describes the features of the terminal device interworking model which enables the service and content to be consumed between/among the multiple Intern
28、et Protocol television (IPTV) terminal devices. Those features include interworking enabled terminal functionalities, functional roles, application framework, application programming interfaces (APIs) and physical/logical interfaces among the multiple IPTV terminal devices, which are also specified
29、in this Recommendation. The expected types of terminal devices are basic terminal devices defined in ITU-T H.721, as well as full-fledged terminal devices and mobile terminal devices, which are defined in ITU-T H.722 and ITU-T H.723, respectively. 2 References The following ITU-T Recommendations and
30、 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 to revision; users of this Recommendation are therefore encour
31、aged 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. The reference to a document within this Recommendation does not give it, as a stand-alone docu
32、ment, the status of a Recommendation. ITU-T H.720 Recommendation ITU-T H.720 (2008), Overview of IPTV terminal devices and end systems. ITU-T H.721 Recommendation ITU-T H.721 (2015), IPTV terminal devices: Basic model. ITU-T H.722 Recommendation ITU-T H.722 (2014), IPTV terminal device: Full-fledged
33、 model. ITU-T H.723 Recommendation ITU-T H.723 (2016), IPTV terminal device: Mobile model. ITU-T H.772 Recommendation ITU-T H.772 (2015), IPTV terminal device discovery. ITU-T Y.1901 Recommendation ITU-T Y.1901 (2009), Requirements for the support of IPTV services. ITU-T Y.1910 Recommendation ITU-T
34、Y.1910 (2008), IPTV functional architecture. 3 Definitions 3.1 Terms defined elsewhere This Recommendation uses the following terms defined elsewhere: 3.1.1 end user ITU-T Y.1901: The actual user of the products or services. NOTE The end-user consumes the product or service. An end-user can optional
35、ly be a subscriber. 3.1.2 Internet Protocol television (IPTV) ITU-T Y.1901: Multimedia services such as television/video/audio/text/graphics/data delivered over IP-based networks managed to support the required level of QoS/QoE, security, interactivity and reliability. 2 Rec. ITU-T H.724 (12/2017) 3
36、.1.3 interworking b-ITU-T Y.1401: The term interworking is used to express interactions between networks, between end systems, or between parts thereof, with the aim of providing a functional entity capable of supporting an end-to-end communication. 3.1.4 IPTV terminal device ITU-T Y.1901: A termina
37、l device which has ITF functionality, e.g., an STB. 3.1.5 IPTV terminal function (ITF) ITU-T Y.1901: The end user function(s) associated with a) receiving and responding to network control channel messages regarding session set-up, maintenance, and teardown, and b) receiving the content of an IP tra
38、nsport from the network and rendering. 3.1.6 linear TV ITU-T Y.1901: A television service in which a continuous stream flows in real time from the service provider to the terminal device and where the user cannot control the temporal order in which contents are viewed. 3.1.7 middleware ITU-T Y.1901:
39、 A layer of software between applications and resources, which consists of a set of service enablers that allow multiple functionalities running on one or more devices in an IPTV system to interact across a network. 3.1.8 service and content protection (SCP) ITU-T Y.1901: A combination of service pr
40、otection and content protection. 3.1.9 terminal device (TD) ITU-T Y.1901: An end-user device which typically presents and/or processes the content, such as a personal computer, a computer peripheral, a mobile device, a TV set, a monitor, a VoIP terminal or an audiovisual media player. 3.1.10 time sh
41、ifting ITU-T Y.1901: A function which allows playback of content after its initial transmission. 3.2 Terms defined in this Recommendation This Recommendation defines the following terms: 3.2.1 multi-device service: An IPTV service for which all related IPTV functions are distributed cooperatively am
42、ong two or more devices. NOTE The term “Multi-screen“ is used synonymously with “Multi-device“ in this Recommendation. 3.2.2 multi-device interworking: Interworking among multiple terminal devices with the aim of performing a task by working together, where the terminal devices are possibly of diffe
43、rent models. 3.2.3 multi-device application: An interworking-enabled application that could add a multi-device service feature into IPTV service. 3.2.4 multi-device enabler: A set of functional components that provides capabilities for device interworking. 3.2.5 interwork instance: A possible config
44、uration of functional roles for a pair or group of IPTV terminal devices for supporting a specific multi-device service scenario. 4 Abbreviations and acronyms This Recommendation uses the following abbreviations and acronyms: API Application Programming Interface DMC Digital Media Controller DMP Dig
45、ital Media Player DMR Digital Media Renderer DMS Digital Media Server Rec. ITU-T H.724 (12/2017) 3 DVR Digital Video Recorder ECG Electronic Content Guide EPG Electronic Programme Guide GUI Graphical User Interface HN Home Network IP Internet Protocol IPTV Internet Protocol Television IPTV TD Intern
46、et Protocol Television Terminal Device ITF IPTV Terminal Function LAN Local Area Network mDNS Multicast DNS MDS Multi-Device Service OS Operating System P2P Peer to Peer PDA Personal Digital Assistant PVR Personal Video Recorder QoE Quality of Experience QoS Quality of Service RP Reference Point RTC
47、P RTP Control Protocol RTP Real-Time Protocol SADS Service and Application Discovery and Selection SCAP Service, Content and Application Protection SCP Service and Content Protection STB Set-Top Box TD Terminal Device TDES Terminal Device and End System TD-PD Terminal Device Peripheral Device UI Use
48、r Interface UPnP Universal Plug and Play VoD Video-on-Demand Wi-Fi Wireless Fidelity 5 Conventions In this Recommendation: The keywords “is required to“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be clai
49、med. 4 Rec. ITU-T H.724 (12/2017) The keywords “is prohibited from“ indicate a requirement which must be strictly followed and from which no deviation is permitted if conformance to this Recommendation is to be claimed. The keywords “is recommended“ indicate a requirement which is recommended but which is not absolutely required. Thus this requirement need not be present to claim conformance. The keywords “is not recommended“ indicate a requirement which is not recommended b
