IEC 62766-1:2017

IEC 62766-1 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Consumer terminal function for access to IPTV and open internet multimedia
services –
Part 1: General
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IEC 62766-1 ®
Edition 1.0 2017-05
INTERNATIONAL
STANDARD
colour
inside
Consumer terminal function for access to IPTV and open internet multimedia

services –
Part 1: General
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 33.160.99; 35.110; 35.2440.95 ISBN 978-2-8322-4208-7

– 2 – IEC 62766-1:2017 © IEC 2017

CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 8
2 Normative references . 8
3 Terms, definitions and abbreviated terms . 9
3.1 Terms and definitions . 9
3.2 Abbreviated terms . 12
4 OIPF terminal function and network interfaces overview . 16
4.1 General . 16
4.2 Media formats . 18
4.3 Adaptive streaming . 19
4.4 Content metadata . 19
4.5 Protocols . 20
4.6 Declarative application environment . 22
4.7 Procedural application environment . 23
4.8 Authentication, content protection and service protection . 23
4.9 Profiles . 24
Annex A (informative) XML schemas . 26
A.1 Imports . 26
A.2 Includes . 27
A.3 Redefines . 27
A.3.1 General . 27
A.3.2 ce-html-profiles-1-0.xsd . 28
A.4 Schemas . 28
A.5 Classification schemes . 29
A.6 Examples . 29
Annex B (informative) High-level architecture . 30
B.1 Reference points identification . 30
B.2 Reference points description . 30
B.3 Residential network high-level architectural overview . 32
B.3.1 Architecture . 32
B.3.2 Functional entities . 33
B.4 Residential network functional entities . 34
B.4.1 General . 34
B.4.2 Open IPTV terminal functional entity (OITF) . 35
B.4.3 OITF and IG . 38
B.4.4 OITF, IG, AG and CSPG . 40
Bibliography . 43

Figure 1 – Open IPTV Forum scope . 6
Figure 2 – IPTV solution scope . 17
Figure 3 – Residential network, functional entities, UNI and HNI reference points . 21
Figure B.1 – Mapping functional entities to UNI reference points . 30
Figure B.2 – Residential network architecture . 32

Figure B.3 – OITF functions and exposed interfaces . 35
Figure B.4 – OITF and IG . 38
Figure B.5 – All HN functional entities . 40

Table 1 – UNI reference point descriptions and protocols . 22
Table A.1 – Imported XML schema files . 26
Table A.2 – Imported classification schemes . 27
Table A.3 – OIPF XML schema include files . 27
Table A.4 – OIPF XML schemas . 28
Table A.5 – OIPF XML examples . 29
Table A.6 – OIPF XML examples . 29
Table B.1 – UNI reference points . 31

– 4 – IEC 62766-1:2017 © IEC 2017
NTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONSUMER TERMINAL FUNCTION FOR ACCESS
TO IPTV AND OPEN INTERNET MULTIMEDIA SERVICES –

Part 1: General
FOREWORD
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A Category D liaison was set up between TC100 and the OPEN IPTV FORUM in 2011. The
OPEN IPTV FORUM was merged with the Hybrid Broadcast Broadband Television (HbbTV)
Association in 2014.
International Standard IEC 62766-1 has been prepared by IEC technical committee 100:
Audio, video and multimedia systems and equipment.
The text of this International Standard is based on the following documents:
CDV Report on voting
100/2484/CDV 100/2656/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
A list of all parts in the IEC 62766 series, published under the general title Consumer terminal
function for access to IPTV and open internet multimedia services, can be found on the IEC
website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62766-1:2017 © IEC 2017
INTRODUCTION
The IEC 62766 series is based on a series of specifications that was originally developed by
the Open IPTV Forum (OIPF). They specify the user-to-network interface (UNI) for consumer
terminals to access IPTV and open internet multimedia services over managed or non-
managed networks as defined by OIPF.
The Open IPTV Forum (OIPF) IPTV solution provides specifications for an end-to-end
platform for the deployment of IPTV services. Figure 1 shows a high-level logical view of the
scope of the OIPF IPTV solution.
The Open IPTV Forum has developed an end-to-end solution to allow any consumer end-
device, compliant to the Open IPTV Forum specifications, to access enriched and
personalised IPTV services either in a managed or a non-managed network.
To that end, the Open IPTV Forum focuses on standardising the user-to-network interface
(UNI) both for a managed and a non-managed network, as depicted in Figure 1.
Managed Network
rd
3 Party Content
OIPF
Provider
Common UNI
Service
CP
Access IPTV
Platform
Provider Provider
Provider
SLA
Home
Network
Triple-play walled garden
Open Internet
Service
IPTV
Access
Platform
Provider
Provider
CGM
Provider
SLA
Consumer
Generated Media
Portal site walled garden
IEC
Figure 1 – Open IPTV Forum scope
Throughout the specifications, the terms “open Internet” and “unmanaged network” are used
interchangeably to refer to the ability to access any service provider using any access
network provider without any quality of service guarantees.
Managed network IPTV services are provided with QoS guarantees, for example within a
triple-play walled garden.
Open Internet IPTV services are accessed via the Internet, without QoS guarantees, for
example via a portal.
In both cases, IPTV services are accessed via a service platform that provides supporting
facilities for multiple service providers.
Third-party content providers supply media assets that are delivered within the IPTV services.
The Open IPTV Forum (OIPF) specification for consumer terminal function and network
interfaces for access to IPTV and open Internet multimedia services consist of the following
multiple parts:
• Part 1: General (this document)
• Part 2-1: Media formats
• Part 2-2: HTTP adaptive streaming
• Part 3: Content metadata
• Part 4-1: Protocols
• Part 4-2: Examples of IPTV protocol sequences
• Part 5-1: Declarative application environment
• Part 5-2: Web standards TV profile
• Part 6: Procedural application environment
• Part 7: Authentication, content protection and service protection
• Part 8: Profiles
This document (Part 1) defines general common elements and specifies the document
structure, the scopes of, and relationships between the other parts, which deal with specific
aspects of the OIPF consumer terminal function and network interfaces.

– 8 – IEC 62766-1:2017 © IEC 2017
CONSUMER TERMINAL FUNCTION FOR ACCESS
TO IPTV AND OPEN INTERNET MULTIMEDIA SERVICES –

Part 1: General
1 Scope
This part of IEC 62766 defines general common elements and specifies the structure of
the IEC 62766 series, the scopes of, and relationships between the other parts.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their
content constitutes requirements of this document. For dated references, only the edition
cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
IEC 62766-2-1, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 2-1: Media formats
IEC 62766-2-2, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 2-2: HTTP adaptive streaming
IEC 62766-3, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 3: Content metadata
IEC 62766-4-1, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 4-1: Protocols
IEC 62766-4-2, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 4-2: Examples of IPTV protocol sequences
IEC 62766-5-1, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 5-1: Declarative application environment
IEC 62766-5-2, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 5-2: Web standards TV profile
IEC 62766-6, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 6: Procedural application environment
IEC 62766-7, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 7: Authentication, content protection and service protection
IEC 62766-8, Consumer terminal function for access to IPTV and open internet multimedia
services – Part 8: Profiles
3 Terms, definitions and abbreviated terms
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
3DTV
plano-stereoscopic three-dimensional television
3.1.2
access network
network infrastructure used by the access provider to deliver IPTV services to the consumer
Note 1 to entry: The access network infrastructure is used for the delivery of the content and may include quality
of service management to ensure that appropriate network resources are available for the delivery of the content.
3.1.3
application
collection of assets and logic that together provide a service to the user
Note 1 to entry: Assets and logic may reside either in an application server or in the ITF or both.
3.1.4
catch-up TV
service that allows the end user, using an EPG or a portal, to watch linear TV programs that
were previously broadcast
3.1.5
consumer domain
domain where the IPTV services are consumed
Note 1 to entry: A consumer domain can consist of a single terminal or a network of terminals and related devices
for service consumption.
3.1.6
consumer network
local area network in which the IPTV terminal function is located
Note 1 to entry: Consumer networks include residential networks, wireless hot-spots, hotel networks, etc.
3.1.7
consumer
end user
user
individual who use the IPTV services
Note 1 to entry: End users (consumers) may include, for example, members of the same family.
3.1.8
content
instance of audio, video, audio-video information, or data

– 10 – IEC 62766-1:2017 © IEC 2017
3.1.9
content guide
program guide
on-screen guide to scheduled content and content on demand, allowing a user to navigate,
select, and discover content by time, title, channel, genre, etc.
3.1.10
content on demand
CoD
service where a user can select the individual content items they want to watch from the list of
available content
Note 1 to entry: Consumption of the content is started upon user request.
3.1.11
content protection
means to protect content from unauthorized usage
Note 1 to entry: Unauthorized usage includes, for example, redistribution, recording, playback, duplication, etc.
3.1.12
content provider
entity that provides content and associated usage rights to the IPTV service provider
3.1.13
Internet
worldwide, publicly accessible network of interconnected computer networks that transmit
data by packet switching using the standard Internet Protocol (IP)
3.1.14
IPTV service provider
entity that offers IPTV services and which has a contractual relationship with the subscriber
3.1.15
IPTV solution
solution defined by the multi-part series of IEC 62766
3.1.16
IPTV terminal function
ITF
functionality within the consumer network that is responsible for terminating the media and
control for an IPTV service
3.1.17
local storage
content storage within the administrative realm of the IPTV service provider, but not in their
physical environment
Note 1 to entry: For example, local storage could be a partition of storage located in the residential network and
allocated to the service provider to pre-load CoD.
3.1.18
network based personal video recorder
nPVR
provision of PVR functionality whereby the content is stored in the IPTV service provider
domain
Note 1 to entry: The nPVR allows a user to schedule the recording of scheduled content programs. The user can
later select the content they want to watch from the recorded content.

3.1.19
portal
function of a service platform that provides an entry point to individual IPTV services to users
via a GUI
3.1.20
program
segment of scheduled content with a defined beginning and end
3.1.21
push CoD
type of content on demand where the content is pre-loaded to the ITF local storage by the
service provider
Note 1 to entry: The user has no direct control of what content is pre-loaded. However, the service provider may
make the choice based on user preferences and habits. Content is available for direct consumption after the user
selection is confirmed.
3.1.22
residential network
local network of devices (gateways and terminals) at the end user’s premises
3.1.23
scheduled content
service where the play-out schedule is fixed by an entity other than the user
Note 1 to entry: The content is delivered to the user for immediate consumption.
3.1.24
service
content and applications provided by service platform providers and service providers
3.1.25
service access protection
means to protect IPTV services from unauthorized usage/access
Note 1 to entry: Such unauthorized usage or access include access from unauthorized users or a DOS attack.
3.1.26
service platform provider
entity which, based on a contractual relationship with IPTV service providers, provides the
supporting functions for the delivery of IPTV services, which are not part of the IPTV service,
but are required for managing its delivery
Note 1 to entry: Supporting functions for the delivery of IPTV services are, for example, charging, access control
and other functions which are not part of the IPTV service.
3.1.27
service protection
means to protect contents (files or streams) during their delivery
3.1.28
session portability
ability of a given service/application to be switched from one device to another for a
continuation of a session in real time
3.1.29
start-over TV
service that enables the end user to playback a linear TV program that is currently being
broadcasted from its start
– 12 – IEC 62766-1:2017 © IEC 2017
3.1.30
subscriber
individual that makes the contract (subscription) with a service provider for the consumption of
certain services
3.1.31
trick mode
facility to allow the user to control the playback of content
Note 1 to entry: The playback of content includes facilities such as pause, fast and slow playback, reverse
playback, instant access, replay, forward and reverse skipping.
3.1.32
user profile
information associated with a specific user who is a part of a subscription
Note 1 to entry: Information includes, for example, viewing preferences.
3.2 Abbreviated terms
AAC Advanced Audio Coding
ADSL Asymmetric Digital Subscriber Line
AG Application Gateway
AKA Authentication and Key Agreement
AP Access Point and Authentication Proxy
API Application Programming Interface
A-RACF Access Resource Admission Control Function
AS Application Server
ASM Authentication and Session Management
AV Authentication Vector
AVC Advanced Video Coding
A/V Audio and Video
BCG Broadband Content Guide
BMP Baseline Managed Profile
BTF Basic Transport Function
CA Conditional Access
CAC Connectivity Admission Control
CAM CA Module
CAS Conditional Access System
CC Cluster Controller
CD Content Delivery
CDC Connected Device Configuration
CDF Content Delivery Function
CDN Content Delivery Network
CDNC CDN Controller
CDS Content Directory Service
CE Consumer Equipment
CENC Common Encryption (in ISO base media file format files)
CG Content Guide
CGM Consumer Generated Media
CI Common Interface
CK Ciphering Key
CoD Content on Demand
CPE Customer Premise Equipment
CPI Content Provider Interface
CSP Content and Service Protection
CSP-T CSP Terminal based approach
CSPG Content and Service Protection Gateway Gateway
CTD Content Transformation Device
DAE Declarative Application Environment
DASH Dynamic Adaptive Streaming over HTTP
DCF DRM Content Format
DHCP Dynamic Host Configuration Protocol
DIFFServ Differentiated Services
DLNA Digital Living Network Alliance
DLNA DMC DLNA Digital Media Controller
DLNA DMP DLNA Digital Media Player
DLNA DMR DLNA Digital Media Renderer
DLNA DMP DLNA Digital Media Server
DOS Denial of Service
DRM Digital Rights Management
DSCP DIFFServ Code Point
DSL Digital Subscriber Line
DTCP-IP Digital Transmission Content Protection over Internet Protocol
DTT Digital Terrestrial Television
DVB-IP Digital Video Broadcasting (over) Internet Protocol
ECMA ECMA International – European association for standardizing information and
communication systems
EIT Event Information Table
EMP Enhanced Management Profile
EPG Electronic Program Guide
FCC Fast Channel Change
FE Functional Entity
FLUTE File Delivery over Unidirectional Transport
GBA Generic Bootstrapping Architecture
GEM Globally Executable Multimedia home platform
GENA General Event Notification Architecture
GPON Gigabit Ethernet Passive Optical Network
GUI Graphical User Interface
HAS HTTP Adaptive Streaming
HD High Definition
HDMI High Definition Multimedia Interface
HE-AAC High Efficiency AAC
– 14 – IEC 62766-1:2017 © IEC 2017
HLA High Level Architecture
HN Home Network
HNI Home Network Interfaces
HNI-AGG HNI between AG and CSPG
HNI-AGI HNI between AG and IG
HNI-AMNI HNI – Additional Managed Network Interface
HNI-CSP HNI – Content and Service Protection
HNI-IGI HNI – IMS Gateway Interface
HNI-INI HNI – ITF Network Interface
HSS Home Subscriber Server
HTTP Hypertext Transfer Protocol
IAI Internet Access Interface
IG IMS Gateway
IGMP Internet Group Management Protocol
IMPI IMS Private User Identity
IMPU IMS Public User identity
IMS IP Multimedia Subsystem
IP Internet Protocol
IPMP Intellectual Property Management Protocol
IPTV Internet Protocol TeleVision
IRCF ITF Remote Control Function
ISIM IP Multimedia Services Identity Module
ISO International Standards Organisation
ISOBMFF ISO Base Media File Format
ISP Internet Service Provider
ITF IPTV Terminal Function
LAN Local Area Network
MAC Message Authentication Code
M/C-U/C Multicast to Unicast
MDTF Multicast Data Terminating Function
MPEG Motion Picture Experts Group
MSRP Message Session Relay Protocol
MUI Media Interoperability Unit
NAT Network Address Translation
NPI Network Provider Interfaces
nPVR Network Personal Video Recorder
OIP Open Internet Profile
OIPF Open IPTV Forum
OITF Open IPTV Terminal Function
OMA Open Mobile Alliance
P2P Peer-to-Peer
PAE Procedural Application Environment
PC Personal Computer
PDCF Packetized DRM Content Format
PIM Protocol Independent Multicast
PiP Picture-in-Picture
PLMN Public Land Mobile Network
POTS Plain Old Telephony Service
PSS (3GPP) Packet-switched Streaming Service
PVR Personal Video Recorder
QoS Quality of Service
RA Remote Access
RAC Resource and Admission Control
RADA Remote Access Discovery Agent
RAND Random Challenge
RATA Remote Access Transport Agent
RCEF Resource Control Enforcement Function
RET RETransmission
RTP Real Time Protocol
RTCP Real Time Control Protocol
RTSP Real Time Streaming Protocol
RMS Remote Management System
RUI Remote User Interface
SAA Service Access Authentication
SAML Security Assertion Markup Language
SCART Syndicat des Constructeurs d'Appareils Radiorécepteurs et Téléviseurs
S-CSCF Serving Call Session Control Function
SD Standard Definition
SD&S Service Discovery and Selection
SDP Session Description Protocol
SDT Service Description Table
SIM Subscriber Identity Module
SIP Session Initiation Protocol
SLA Service Level Agreement
SMS Short Message Service
SOAP Simple Object Access Protocol
SP Service Provider
SPI Service Provider Interface
SPDF Service-based Policy Decision Function
SPP Service Platform Provider
SSO Single Sign-On
STB Set Top Box
STP SD&S Transport Protocol
SVG Scalable Vector Graphics
TBD To Be Determined
TCI Transport and Control Interface

– 16 – IEC 62766-1:2017 © IEC 2017
TCP/IP Transmission Control Protocol/Internet Protocol
TVA TV Anytime
UE User Entity
UI User Interface
UICC Universal Integrated Circuit Card
UNI User Network Interface
URI Uniform Resource Identifier
URL Uniform Resource Locator
USIM Universal Subscriber Identity Module
UUID Universally Unique IDentifier
VoD Video on Demand
xDSL Any DSL
WAN Wide Area Network
WG WAN Gateway
WLAN Wireless LAN
XHTML eXtensible Hypertext Markup Language
XML eXtensible Markup Language
4 OIPF terminal function and network interfaces overview
4.1 General
Figure 2 shows a high-level logical view of the scope of the OIPF solution in terms of
networks and functional entities in the residential network. Note that there is no prescription
about how these functional entities are mapped to physical device implementations. For
example, it is conceivable that a single residential device could host a terminal (OITF)
function and any of the gateway functions (IMS-, Application-, and/or Content and Service
Protection Gateways) in one "box". Clause 5.3.4 of the OIPF Architecture specification [1]
describes many plausible deployment scenarios involving allocation of these functional
entities to physical entities such as a TV or a STB.
Managed network IPTV services are provided from within an operator’s core network,
enabling the service provider to make use of service enhancement facilities like multicast
delivery and QoS provision. A managed network may rely on the IMS architecture, but non-
IMS based managed networks are also in the scope of this document.
Open Internet IPTV services are accessed via an independently operated access network,
with or without QoS guarantees. Open Internet IPTV services may be accessed via a service
platform (e.g., a portal) that provides supporting facilities for multiple service providers.
___________
Numbers in square brackets refer to the Bibliography.

Broadcast Managed Network
Services
IPTV Service
OITF
IPTV Service IPTV Service
IG
OITF
AG
Service Platform
OITF
CSPG
Access Core
WAN
Gateway Network Network
Residential Network
IPTV Service
OITF Open IPTV Terminal Function
IG IMS Gateway
IPTV Service
AG Application Gateway
Service Platform
CSPG Content and Service Protection Gateway
IPTV Service
IEC
Figure 2 – IPTV solution scope
The document provides an end-to-end solution that can provide any of the following IPTV
services:
• scheduled content services (linear TV), possibly hybrid (combining the usage of IPTV and
broadcast delivery), including their recording (PVR), and electronic programme guide
(EPG);
• content on demand (both streaming and download) services;
• network PVR and managed local PVR, including timeshift for network PVR and
personalised channel services;
• purchase of digital media service;
• information services, both with and without any relation to the content delivery services;
and
• notification services (network-generated notifications, user reminders, emergency
announcement);
• communication services, including notifications, and their blending with the content
delivery services;
• media formats for voice and A/V communication services;
• hybrid (broadcast-broadband) application support.
These IPTV services can be provided generally in both the managed network and open
internet modes of operation, but there may be differences in how each service is provided
between these two modes of operation. IPTV services in managed networks may use service
enhancement facilities like multicast delivery and QoS provision.
Functions are specified that enable attractive and innovative ways to provide the services
listed above. They can be summarised as:
• service provisioning, including network attachment, user management, including the
management of multiple users within a household, where applicable, quality-of-service

– 18 – IEC 62766-1:2017 © IEC 2017
(QoS) provisioning, remote management of the devices in the home network, including
configuration, fault diagnosis and software upgrade;
• service access and control;
• service and content navigation;
• interactive application platforms;
• content and service protection, where applicable;
• interworking with DLNA-compliant home network devices;
• bookmarking of content;
• session continuity and portability between devices;
• adaptive streaming of content over HTTP, specified in IEC 62766-2-2;
• fast-channel change (FCC) and retransmission (RET), based on DVB-IPTV;
• HNI-IGI instantiation using SIP;
• content navigation controls (also known as “forced play-out”);
• DLNA remote UI-based control of the OITF.
These services and functions are derived from the Open IPTV Forum publication “Services
and Functions for Release 2”, V1.0, October 2008 [2].
The other parts of the IEC 62766 series are introduced in 4.2 to 4.9.
Annex A provides an informative summary of all the uses of XML schemata in the IEC 62766
series.
Annex B provides the definition of the relevant functional entities and the reference points
between them, which are specified normatively in the other parts of the IEC 62766 series.
Compared with the ITU-T IPTV architecture, as specified in ITU-T Recommendation Y.1910
[3], the OIPF Functional Architecture [1] applies different terminology for functional entities
and reference points, but there is a clear logical mapping between the two architectures,
hence they are not in contradiction in any respect.
The OIPF IPTV terminal function (OITF), as described above, is a logical functional entity that
can be implemented in any kind of appropriate terminal device. The OITF implements the UNI
specified in the present document but there is no prescription of the actual terminal device.
This is in contrast, to a certain extent, to the approach for ITU-T terminal devices introduced
in ITU-T Recommendation H.720 [4], but the two approaches are not in contradiction.
4.2 Media formats
IEC 62766-2-1 specifies the complete set of adopted media formats, including audio, video
and systems layers, also ancillary content such as subtitles and resources used by other parts
of the solution, namely graphics and audio clip formats for the interactive application
environments.
Support for H.264/AVC video [5] and HE-AAC audio for content delivery services is mandatory,
but further optional codecs are included in order to cater for specific regional requirements
and migration from legacy deployments.
Video formats for A/V content services are specified for HD and SD formats. Sub-picture
video profiles for PiP and other services are also specified.

Systems layers are specified based on MPEG-2 systems (transport stream) and the MP4 file
format, both of which are mandatory to be supported for unprotected content in the OITF. For
protected files, three variants are specified: OMA DCF, OMA PDCF and Marlin IPMP.
Additional features related to media formats are:
• clean audio function, referring to the solution specified by DVB;
• media formats for voice and A/V communication services;
• media formats for A/V content services via mobile networks to mobile terminals;
• signalling for the delivery of DAE applications in-band within MPEG-2 TS [6].
4.3 Adaptive streaming
IEC 62766-2-2 is the specification for HTTP adaptive streaming. There are two methods
specified for enabling adaptive bit-rate streaming with IPTV services.
The first, and preferred method, is based on MPEG DASH [7], whereby OIPF-specific
interoperability points are defined for DASH usage with MPEG-2 TS and ISOBMFF [8]
container content.
The second is the OIPF HTTP adaptive streaming (HAS) format, which is based on 3GPP
Release 9 PSS. An extension is specified in order to accommodate the MPEG-2 TS systems
layer as well as MP4 file format. HAS also provides efficient management and delivery of
component media streams (e.g. alternative audio languages) with adaptively streamed
content.
4.4 Content metadata
IEC 62766-3 specifies all aspects of content metadata, including service provider information
and metadata delivery.
Two levels of service and content discovery and selection are defined, mirroring the DVB
specifications, standardised by ETSI, for service discovery and selection (SD&S) [9], and
broadband content guide (BCG) [10].
Whereas DVB SD&S foresees the delivery of metadata within XML documents, the IPTV
solution also enables service discovery via CE-HTML [11] content as part of an interactive
application hosted by the declarative application environment (DAE), described below.
Provision is also made for metadata to be delivered within the content, i.e. the MPEG-2
transport stream, namely as DVB service information, EIT present/following, without
accompanying SDT information. This method ensures that at least a minimum of metadata is
available to the OITF in every circumstance, e.g. when unicast retrieval of the metadata might
be overloaded at the server. It is also very convenient for quick retrieval e.g. when the OITF is
zapping through linear TV services.
IEC 62766-3 specifies some extensions to DVB SD&S. Extensions are defined for the
following purposes: DAE application signalling, bandwidth renegotiation, content and service
protection control information, and file format indication.
Several extensions are also specified for BCG, namely: transport protocol indication, content
protection information, and content format information, comprising audio, video, file format,
transport protocol, and parental guidance information.
Metadata delivery is performed as specified in DVB SD&S and BCG, i.e. using DVB SD&S
Transport Protocol [9] for multicast delivery, and HTTP for unicast delivery.

– 20 – IEC 62766-1:2017 © IEC 2017
As specified by DVB, BCG data can be delivered in containers via unicast or multicast,
including updates via TVA fragments. The OITF may also implement the SOAP query
mechanism to selectively retrieve BCG data.
4.5 Protocols
IEC 62766-4-1 brings together the specification of the complete set of protocols for the IPTV
solution, covering the reference point interfaces defined in the OIPF Architecture [1]. These
reference points are classified as:
• the UNI interfaces, between the network or service provider domains and the consumer
domain;
• the HNI interfaces, between the functional entities in the consumer network domain;
• the NPI interfaces, between the functional entities in the network and service provider
domains; and
• interfaces to external systems, e.g. the DLNA home network [12].
Figure 3 shows the functions inside each of the residential network functional entities and the
set of UNI and HNI reference points that interface to them.
Note that the application gateway (AG) functional entity is optional, so that in its absence,
OITFs communicate with services via the HNI-INI set of interfaces directly. This mode is also
still possible when an AG is deployed. Note also that HNI-AGG and HNI-AGI interfaces are
not specified.
a
HNI-INI HNI-INI
UNIT-19
OITF
MDTF
UNIP-1
AG
User Profile Management
UNI-RMS
RMS1
UNIT-18
Performance Monitor Client
UNIS-11
Stream Session Management
UNIS-13, UNIS-14
and Control
Downloaded
UNIS-17
Java Applications
Stream Receiver
UNIS-12
Procedural
Codecs Decrypt
Application
Environment UNIS-CSP-T
CSP
(PAE)
UNIS-6
DAE
RUI Server
UNIS-15, UNIS-19
IPTV Service Discovery
UNIS-7
Metadata CG Client
OITF Embedded A
...