INTERNATIONAL TELECOMMUNICATION UNION
FOCUS GROUP ON IPTV
TELECOMMUNICATION
STANDARDIZATION SECTOR
FG IPTV-DOC-0056
English only
STUDY PERIOD 2005-2008
2nd FG IPTV meeting:
WG(s): 1
Busan, 16-20 October 2006
OUTPUT DOCUMENT
Source: Editor
Title:
Working Document: IPTV Architecture
Content
1.
SCOPE ..................................................................................................................................................................... 2
2.
REFERENCES ........................................................................................................................................................ 2
3.
ABBREVIATIONS ................................................................................................................................................. 2
4.
DEFINITIONS ........................................................................................................................................................ 2
5.
INTRODUCTION ................................................................................................................................................... 2
6.
IPTV RELATIONSHIP WITH NGN AND OTHER NETWORKS .................................................................. 3
7.
REFERENCE MODEL .......................................................................................................................................... 4
8.
IPTV ARCHITECTURE ........................................................................................................................................ 4
8.1 “NON-NGN-BASED” ARCHITECTURE ........................................................................................................................ 7
8.2 NGN-BASED IPTV ARCHITECTURE .......................................................................................................................... 7
8.2.1 NON-IMS-BASED IPTV ARCHITECTURE ............................................................................................................... 7
8.2.2 IMS-BASED IPTV ARCHITECTURE ......................................................................................................................... 8
8.3 OVERALL ARCHITECTURE OF IPTV .......................................................................................................................... 4
Contact:
Julien Maisonneuve
Alcatel SA
France
Tel:
+33 1 4076 1145
Fax:
+33 1 4076 1259
Email: Julien.Maisonneuve@alcatel.com
Attention: This is a document submitted to the work of ITU-T and is intended for use by the participants to the activities of ITU-T's
Focus Group on IPTV, and their respective staff and collaborators in their ITU-related work. It is made publicly available for
information purposes but shall not be redistributed without the prior written consent of ITU. Copyright on this document is owned by
the author, unless otherwise mentioned. This document is not an ITU-T Recommendation, an ITU publication, or part thereof.
-2FG IPTV-DOC-0056
IPTV Architecture
1. Scope
2. References
The following ITU-T Recommendations and other references contain provisions, which, through
reference in this text, constitute provisions of this working document. At the time of publication, the
editions indicated were valid. All Recommendations and other references are subject to revision;
users of this working document 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.
The reference to a document within this Recommendation does not give it, as a stand-alone
document, the status of a Recommendation
[1]
ITU-T Recommendation Y.2012 (2006), Architecture and Requirement of the NGN
3. Abbreviations
This working document uses the following abbreviations.
IPTV
Internet Protocol TV
NGN
Next Generation Network
IMS
4. Definitions
This working document uses or defines the following terms:
5. Introduction
[Editor’s Note: introduction text is required here.]
3 approaches were identified for the architecture of IPTV.
(1) “NGN-based” and “IMS-based” architecture
An IPTV service component is drawn on top of the “other NGN service components” in NGN
architecture shown in Figure TBD. The IPTV service component is achieved by using IMS.
(2) “NGN-based” and “non-IMS-based” architecture
An IPTV service component is drawn on top of the “other NGN service components” in NGN
architecture shown in Figure TBD. The IPTV service component is achieved without using IMS.
(3) “Non-NGN-based” architecture
The architecture does not depend on NGN architecture [1].
[Editor’s Note: need a figure to underline the differences between those 3 approaches.]
-3FG IPTV-DOC-0056
6. IPTV Relationship with NGN and other networks
The “NGN-based” architecture means the IPTV architecture in accordance with [1] for providing
IPTV services. The NGN components described in [1] are shown in Fig. 1.
[Editor’s Note: more text is needed here.]
[Editor’s Note: more text should be added to restate that the NGN Architecture does not exclude
legacy networks .]
[Editor’s Note: change “Streaming Service Component” to “ IPTV Service Component” in the
figure below.]
Third Party Applications
Service Stratum
Application/Service
Functions
ApplicationSupport
Functions
S. User
Profile
Functions
Other Multimedia Service
Components …
Service
Control
Functions
Streaming Service
Component
IP Multimedia
Component
IP Multimedia
&PSTN/ISDN
Simulation
Service Component
Legacy
Terminals
Legacy
Terminals
Customer
Networks
NGN
Terminals
End-User
Functions
GW
GW
T.User
User
Profile
Profile
Functions
Functions
Network
Attachment
Network
Access
Control Functions
Attachment
Functions
(NACF)
NAAF
Access
Network
Access Transport
Functions
Functions
Resource and Admission
Control Functions
(RACF)
Edge
Functions
Core
Core Transport
transport
Functions
Functions
Transport Stratum
* Note: Gateway (GW) may exist in either Transport Stratum
or End-User Functions.
Figure-1 Transport and service configuration of the NGN
Other Networks
PSTN / ISDN Emulation
Service Component
-4FG IPTV-DOC-0056
7. Reference Model
[Editor’s note: the contribution C-0233 proposed to remove the Typical Functions in each bubble
of the next diagram.]
[Editor’s note : It was suggested during the scenarios that Content Aggregation Entity to be
considered.]
Content
Provider
Service
Provider
Network
Provider
Consumer
Figure-2 Reference Model
[Editor’s note: The table of content is provisional and will include more sections]
8. IPTV Architecture
[Editor’s Note: There should be a section to describe Service Exchange Points. This note is coming
from C-135 and not approved by WG.]
8.1 High Level Architecture of IPTV
[Editor’s Note: the ordering of those sections can be changed. ]
8.1.1 High Level Architecture 1
-5FG IPTV-DOC-0056
System Management and Security
C
Content Provision
Content
Source
B
User
Command
End
System
D
G
IPTV Control
A
E
F1
F2
Content Delivery
Figure 3 IPTV Functional Architecture
Information cross each reference point is listed as following (not complete),
 A: Content Stream
 B: Content Request, Descriptive Metadata/Content Info etc.
 C: Rights Management Interaction
 G: Conditional Access System
 D: Service Interaction Message
 E: Content Location Info, Billing Info., Content Control Command, etc.
 F1: Play Control Signal

F2: Content Stream
[Editor’s Note: The figure and attached text above is taken from FG IPTV-C-0170 with some
modification.]
[Editor’s Note: the list below is picked from FG IPTV-C-0111 Figure 1.]
Service Management Platform Functions:










Subscribe
Service
Account
STB
Content
CP
Resource
Portal
System
Statistics
-6FG IPTV-DOC-0056
Content Control
Cmd./
Content Location
Info.
Cache/Storag
e
Distribution
Play Control
Content
Stream
End System
IPTV Control
Play Control
Content
Stream
Content Provision
Streaming
Control
Content Delivery
Figure 4 Functional Architecture of the Content Delivery Sub-system
[Editor’s Note: The diagram above is taken from FG IPTV-C-0169 with some modifications.]
[Editor’s Note: the diagram above is not yet approved by WG1. ]
8.1.2 High Level Architecture 2
IPTV Terminal
Application Layer
Converged Services and Application
IPTV
Client
Session
Protocol
IPTV / Session
Control
Streaming
Client
Customer
Transport
Network Gateway
IPTV
Application
Transaction Protocol
Control
Protocol
Streaming Protocol
Multicast Protocol
Authentication Protocol
NGN
Access
Transport
IPTV Control
Streaming for
Broadcast & VoD
Network Attachment
Access
IMS
Application
IPTV Subscriber
Management
IMS
User Profile
User Profile
NGN Service Orientated Sub-systems
NGN
IP Control
Sub-Systems
Resource &
Admission
Edge Functions
Figure 5 Converged Applications
Core
NGN
Core
Transport
-7FG IPTV-DOC-0056
[Editor’s Note: the diagram above is coming from Ad-hoc meeting, and not be approved by WG1
yet.]
8.2 Non-NGN-based architecture
Application Layer
IPTV Terminal
IPTV
Client
IPTV
Control
Streaming
Client
Customer
Network
Network Gateway
Control
Protocol
Streaming Protocol
IPTV Control
User Profile
Streaming for
Broadcast & VoD
Multicast Protocol
Network
Authentication
Authentication Protocol
Access
Network
IPTV Subscriber
Management
IPTV
Application
Transaction Protocol
Access
Network
Control
Resource
Control
Edge Functions
Core
Core
Network
Figure 6 Non-NGN IPTV Delivery Architecture
[Editor’s Note: the diagram above is coming from Ad-hoc meeting, and not be approved by WG1
yet.]
8.3 NGN-based IPTV Architecture
8.3.1 Non-IMS-based IPTV Architecture
-8FG IPTV-DOC-0056
IPTV Terminal
IPTV
Client
Application Layer
IPTV
Application
Transaction Protocol
IPTVIPTV
/ Session
Control
Control
Protocol
Streaming Protocol
Streaming
Client
NACF Network
Attachment Function
Authentication Protocol
Network Gateway
NGN
Access
Transport
IPTV Control
Streaming for
Broadcast & VoD
Multicast Protocol
Customer
Transport
IPTV Subscriber
Management
Access
User Profile
NGN Service Orientated Sub-systems
NGN
IP Control
Sub-Systems
RACF Resource &
Admission Function
Edge Functions
NGN
Core
Transport
Core
Figure 7 Non-IMS Based IPTV Architecture
[Editor’s Note: the diagram above is coming from Ad-hoc meeting, and not be approved by WG1
yet.]
IPTV
Component
HTTP
RACF
UE
ABG-FE
RTSP
ABG-FE
RTP stream
HTTP
CoD
server
SD&S
server
Figure-8 Example of non-IMS-based architecture for unicast IPTV services
8.3.2 IMS-based IPTV Architecture
[Editor’s Note: The concept of maintenance needs to be introduced and need to be further
studied.]
-9FG IPTV-DOC-0056
[Editor’s Note: IMS Argumentation need more text.]
IPTV IMS based architecture ensures:
- SIP protocol dedicated to multimedia
- Modular architecture
- Easy integration with old telecommunication networks and exists services
- Central billing system based on Parley OSA solution.
- Third-party services
[Editor’s Note: the above text is not yet approved by WG1.]
IPTV Terminal
IPTV
Client
Application Layer
Session
Protocol
IPTV
Session
/ Session
Control
Streaming
Client
Customer
Transport
Network Gateway
IPTV
Application
Transaction Protocol
Streaming Protocol
Multicast Protocol
Authentication Protocol
NGN
Access
Transport
Streaming for
Broadcast & VoD
NACF Network
Attachment Function
Access
IMS
Application
IPTV Subscriber
Management
IMS
User Profile
NGN Service Orientated Sub-systems
NGN
IP Control
Sub-Systems
RACF Resource &
Admission Function
Edge Functions
Core
NGN
Core
Transport
Figure 9 IMS Based IPTV Architecture
[Editor’s Note: the diagram above is coming from Ad-hoc meeting, and not be approved by WG1
yet.]
- 10 FG IPTV-DOC-0056
Application Servers
Ut1
Rf/Ro
Rf/Ro
Other types of service logic
Network
Attachement
Control
Function
Charging
Functions
IPTV Service logic
Sh
SUP-FE
SAA-FE Cx
Rf/Ro
Dh
ISC/Ma
SL-FE
Dx
NSIW-FE
P3
Core IMS
e2
Mx
Mw
Ic
IBC-FE
I/S- CSCF
Mx
Mi
BGCF
Mk
Mr
Mw
Rs
Mj
Mx
P- CSCF
Mg
MRFC
MGCF
Ie
SG- FE
Gm
Ut1
Mp
Mn
Resource and Admission Control Function
PSTN/ISDN
Rs
IP Networks
Gm
Ib
Iw
UE
MRP- FE
TMG-FE
T
IBG-FE
IP Transport (Access and Core)
STB
Figure-10 IMS-based architecture for IPTV
[Editor’s Note: The figure above is taken from FG IPTV-C-0156er1.]
[Editor’s Note: The entities in light blue in the figure above may require modifications beyond the
ITU-T SG13 definition.]
SIP
IMS
SIP
RACF
UE
ABG-FE
RTSP
ABG-FE
RTP stream
HTTP
CoD
server
SD&S
server
Figure-11 Example of IMS-based architecture for unicast IPTV services