INTERNATIONAL TELECOMMUNICATION UNION
FOCUS GROUP ON IPTV
STUDY PERIOD 2005-2008 Original: English
Question(s): WG4 1st FG IPTV meeting:
Geneva, 10-14 July 2006
Source: WG 4 Leader
Title: Meeting Report of IPTV Network Control Aspects
Working Group 4 met in Geneva, Switzerland from 10 to 14 July 2006. Mr. Dae-Gun Kim (KT, Korea)
chaired the meeting.
1 Goals of the meeting
The group met to progress the work on the following subjects.
• Define the mandate
• Identify Terms of References
• Review of Input Documents addressed to the meeting
• Identify detailed work plan through the contributions
2 Summary of the results
Key results of this group are summarized as following. Summary of key results are as follows:
• Change the title of WG: Given title of the group “Network and control aspects” raised many of
confusion to the participants, especially big confusion with WG1 mandates on architecture
aspects. After taking consideration with other WGs and management team, the meeting agreed
to focus on the control aspects of IPTV networks, accordingly changing title of the group
should be “IPTV Network control aspects”.
• Set up of Terms of Reference: One of key objective of this meeting is defined clear terms of
reference of the group. ITU-T TSB Circular letter 85 is used as a framework for identifying
terms of reference. One contribution is addressed on this also. Based on these inputs, meeting
agreed terms of reference as shown in section 3.1.
Contact: Dae-Gun Kim Tel: +82-31-727-5580
KT Fax: +82-31-727-5569
Korea Email email@example.com
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• Future work plan: The outstanding issues on the IPTV network control aspects are contained at
the living list (see FG IPTV-OD-0011). The alignments with general network architecture and
its more detailed network control functions based on issues identified in living lists are needed
to study in more details at the next meeting.
3 Detailed results
3.1 Term of References (ToR)
Meeting discussed Term of Reference for this group based on Circular letter 85 which contained
proposed ToR from TSB Directors’ consultation meeting at April 2006. One input document (FG
IPTV-ID-0030) was submitted at this meeting. Meeting agreed significantly simplified it more crisp
and clean mandate declaration for the group. Following issues are identified and agreed as ToR.
• Naming, addressing and identification aspects:
The Source or Distributor for IP TV could be identified by using IPv4/IPv6 address, URL name,
E.164 number, etc.
• Control and signaling mechanisms
Control and signaling mechanisms for IPTV are identified in transport and service stratum. The
key features of transport stratum could have many functions such as, multicast, unicast and
distribution control function, admission and attachment control function, resource control
function, mobility control functions, etc. And the key features of service stratum could have
session and service control function. Multicasting aspects could be identified at home network,
access network and core network.
• Content distribution aspects
This working group will review, analyze, recommend and if necessary define network protocols
and mechanisms to support non-real time and real-time delivery of content and information in
support of IPTV applications. This includes defining requirements and recommendations for the
− Services such as VOD & EPG content delivery, System Information, Ad-Insertion (e.g.
− Content Transport leveraging system layers such as MPEG-2 Transport Streams and/or
− Signaling protocols
− Support of IPTV capabilities such as QoS/QoE, Content Protection, Closed Captioning
• Home, Access and Core network issues
Addressing functions and signaling that may be required for IPTV that depends on home, access
and core network technologies being used.
• Other Related issues
- Various access and core transport scenarios for multicasting
- Interface protocols of UNI, NNI, and SNI where identified by architecture
- Multicast VPN including multicast group management
- Interworking aspects of Multicasting under heterogeneous environments
- Control signaling for QoS/QoE
3.2 Network architecture and requirement aspects of IPTV
• FG IPTV-ID-49: It proposes various access network technologies in IPTV. It looked to expand
the scope of this working group to include defining both access network independent and access
network specific requirements for IPTV. It was accepted in general. Several sections (6.2, 6.3,
8 and 9) in this contribution are retained on Living List for further study.
• FG IPTV-ID-59: It proposes CDN architecture based IPTV media delivery system. It is a
little hard to evaluate specific proposals for this area at this time. Therefore, this proposal
should be submitted to WG1R (Requirements) first.
• FG IPTV-ID-87: It proposes RTP/UDP/MPEG2 TS as a means of transmission for IPTV
Streams. This contribution is retained on Living List for further study.
3.3 Control aspects of IPTV Networks
• FG IPTV-ID-28: It proposes Interactive control Requirements for IPTV Service in order
to define a content distribution and transmission framework in view of network and service
including interactive control requirements using multicasting with unicasting transmission.
This issue is retained on Living List for further study
• FG IPTV-ID-83: It proposes prospective study items for NGN signalling for broadband
services. Meeting agreed to retain on living list the contents of 3.3 on “Harmonization between
telecommunication signalling and broadcast signalling” for further discussion. Contributor
kindly requested to submit input documents at the next meeting identifying more details.
3.4 Identification aspects of IPTV
• FG IPTV-ID-93: It proposes the IPTV unified subscriber’s identification. The SIP URL
format as the IPTV unified subscriber’s identification can be considered in the interoperability
between IPTV and other service network such as NGN and 3G. This contribution is retained on
Living List for further study
3.5 QoS aspects of IPTV
• FG IPTV-ID-13: It proposes the user requirements for perceptual video quality monitoring of
IPTV. This contribution will be presented and addressed in both WG2 (QoS) as well as WG4
(Network). It leverages work being done in SG9 and requires a "side channel" for passing
video quality delivery information back to the network and source. While the lead WG should
be WG2 (QoS) we expect any signalling or transport requirements for video quality monitoring
will be presented back to this WG4 (Networking & Signalling) working group.
3.6 Coordination with other groups
• FG IPTV-ID-11: It proposes the discussion issues about Y.ngn-mcast (NGN Multicast Service
Capabilities with MPLS-based QoS Support). While the use of MPLS-based QoS is important
for IPTV, the proposal in this contribution was not accepted since it was ruled that the
ownership of this effort belongs in our parent SG13.
4 Joint meeting with WGs
Meeting recognized joint meetings with other WGs at the next meeting, especially with WG1 and
WG2 to clear the boundaries and avoid any further confusion. It is requested to assign joint
sessions with those groups from the next meeting based on the situation of input documents.
5 Outgoing liaisons
No liaison statements are issued at this meeting.
6 Output documents
Document number Title
FGIPTV-OD-0010 Working Document on “Requirements of IPTV Network control aspects”
FGIPTV-OD-0011 Living List on IPTV Network Control Aspects
7 Plan for next meeting activities
• Further development of the outstanding issues on the IPTV network control aspects which are
contained at the living list.
• To progress of the alignments between general network architecture and more detailed network
control functions to produce the relevant mapping.
• To progress the arrangement of IPTV network control model in comparisons with the NGN
WG 4 leader thanks all participants for their work and dedication during the course of this meeting.
Special thanks to Mr. Greg Thompson (Cisco, USA) on his great help to develop ToR and other
Input Documents addressed to this meeting
Doc. No. Titles Sources WGs
FG IPTV-ID-5 SG 17 interest in IPTV Focus Group SG17 All
FG IPTV-ID-9 LS on IPTV Focus Group SG 16 All
Discussion issues about Y.ngn-mcast (NGN Architecture,
FG IPTV-ID-11 Multicast Service Capabilities with MPLS-based Korea
QoS Support) Network
User requirements for perceptual video quality QoS,
FG IPTV-ID-13 Korea
monitoring of IPTV Network
FG IPTV-ID-17 Technical issues on IP TV standardization Korea All
FG IPTV-ID-28 Interactive control Requirements for IPTV Service KT (Korea)
FG IPTV-ID-35 Study of bearer network for the IPTV Network
MII, Alcatel Requirement,
Proposed requirements for IP access network in
FG IPTV-ID-49 Shanghai
CATR of Architecture,
FG IPTV-ID-52 Proposal studying NGN-based IPTV
MII, Huawei Network
Functional Requirements and Architecture of the CATR of Architecture,
IMS-based IPTV MII, Huawei Network
Functional Requirements and Architecture of the CATR of Architecture,
non-IMS based IPTV MII, Huawei Network
Architecture and Requirement of IPTV Network ZTE
FG IPTV-ID-58 Network
Proposal about CDN architecture based IPTV ZTE Content
media delivery system Corporation distribution
FG IPTV-ID-61 IPTV Security Reference Model and Requirement Security
Key topics of IPTV security and content protection ZTE Security
FG IPTV-ID-64 Proposal about VCDN ZTE Content
Architecture Requirement for Distributed IPTV Content
FG IPTV-ID-74 UTStarcom
Content Delivery System distribution
FG IPTV-ID-76 Multicast Requirements for IPTV Service ETRI Multicast
Proposal on Feature Interactions in Overlay
FG IPTV-ID-77 ETRI Multicast
Networks for IPTV Services
Discussion on prospective study items for NGN
FG IPTV-ID-83 Comware Network
signalling for broadband services
RTP/UDP/MPEG2 TS as a means of transmission
FG IPTV-ID-87 Systems, Network
for IPTV Streams
FG IPTV-ID-93 Proposal on IPTV unified subscriber’s identification Identification