Architectural Views of NGN
and IPTV
Chae Sub Lee
Vice-Chairman of ITU-T SG13
Vice-Chairman of ITU-T FG IPTV
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
Content
1. Direction from definition
2. NGN Architectural Frameworks
3. IPTV Architectural Frameworks
4. Remaining works
5. Future Plan
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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1. Direction from definition
Definition of NGN
ITU-T
Rec.
Y.2001
Next Generation Network (NGN):
a packet-based network able to provide
telecommunication services and able to make use of
multiple broadband, QoS-enabled transport
technologies and in which service-related functions
are independent from underlying transport-related
technologies.
It enables unfettered access for users to networks and
to competing service providers and/or services of
their choice. It supports generalized mobility which
will allow consistent and ubiquitous provision of
services to users.
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
1. Direction from definition
Key Principles of NGN
Open architecture: open to support service creation,
service updating, and incorporation of service logic
provision by third parties and also support “Distributed
control” as well as enhanced security and protection.
Independent provisioning: service provision process should
be separated from network operation by using distributed,
open control mechanism to promote competition.
Multiplicity: The NGN functional architecture shall offer
the configuration flexibility needed to support multiple
access technologies.
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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1. Direction from definition
Definition of IPTV
IPTV is defined as multimedia services such as
television/video/ audio/text/graphics/data
delivered over IP based networks managed to
provide the required level of QoS/QoE, security,
interactivity and reliability
More than
TV distribution
• Multimedia Services
• Over IP based networks
IP
• Managed capabilities
Scope
Of
IPTV
QoS/QoE, Security
Interactivity, Reliability
ITU-T IPTV FG 2nd meeting, October 2006, Busan Korea
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
1. Direction from definition
NGN as an Infrastructure for IPTV
TV
QoS, Traffic control, Security,
X-casting, Accounting etc.
IP
802.xx
Access
Cable
Domain 1
IntServ
Domain 2
DiffServ
Domain 3
MPLS-TE
Domain 4
Over-Prov
xDSL
Multi-Service Packet Transport
NGN
2G/3G
Wireless
Integrated QoS, Traffic control,
Security, Multi services etc.
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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2. NGN Architectural Frameworks
NGN Basic Reference Model
Separation Transport (Access and Core) from Services
But keeping 3 Planes for basic function: User, Control
and Management
Management Plane
Control Plane
User Plane
NGN Service Layer
Management Plane
Control Plane
User Plane
NGN Transport Layer
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
NGN architecture overview (Rec. Y.2012)
Applications
ANI
Management Functions
Application Support Functions & Service Support Functions
Service User
Profiles
Service Control
Functions
Service stratum
Network Attachment
Control Functions
Transport User
Profiles
End-User
Functions
Resource and
Admission
Control Functions
Other
Networks
Transport Control Functions
Transport Functions
UNI
NNI
Transport stratum
Control
Media
Management
Note: UNI/NNI/ANI
are not meant
represent
any
specific
ITU-APT Workshop,
Bangkokto
Thailand,
16~17
March
2007 interfaces.
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2. NGN Architectural Frameworks
Overview of NGN Release 1
Service delivery
platform making use of
NGN easily
Applications
Service Stratum
Application Support Functions and
Application
Functions
Service Support
Functions
A variety of
mobile and fixed
terminals and
their profile
management
targeting at FMC
S. User
Profile
Functions
Other NGN Service
Components
Service
Control
Functions
Evolution
scenario of PSTN
and short-term
solution
Re-use and
adaptation of
3GPP IMS to
provide
multimedia
services
Legacy
Terminals
Legacy
Terminals
IP Multimedia
Component
IP Multimedia
&PSTN/ISDN
Simulation
Service Component
GW
Network Attachment
Network Access
T. User
User
Control Functions
Profile
Profile Attachment
(NACF)
Functions
Functions
Functions
GW
Customer
Networks
NGN
Terminals
End-User
Functions
Other Networks
PSTN/ISDN Emulation
Service Component
AccessTransport
Network
Access
Functions
Functions
Resource and Admission
Control Functions
(RACF)
Edge
Functions
A unified IP network
with improved
security and QoS
Core Transport
Core transport
Functions
Functions
Transport Stratum
Border gateways
* Note: Gateway (GW) mayMedia
exist in either
Transportto
Stratum or End-User
processing
Broadband access
able
Functions.
enabling secure
assist content delivery
to provide IPTV
interworking
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
Towards for Agnostic …
Pre-NGN
Video
Services
(TV, movie,
etc)
Telephone
Services
Data
Services
(WWW,
e-mail, etc)
Video
Services
Network
Telephone
Services
Network
Data
Services
Network
Transport Agnostic
Access Agnostic
Service-based Pol./Reg.
Voice Internet Video
MM
Access Network
Provider Domain
Pol.
Pol.
Reg.
ANP 1 (DSL)
Service/Application
Provider Domain
SP1SP2SP3
SPm
ANP 2 (DSL)
IP (Future Packet ?) Platform
ANP 3 (Opt)
Pol.
Pol. X
Reg. x
xDSL/Optic based FixedFixed-Mobile
User
ANP N (Cable)
Resource-based Pol./Reg.
CNP
1
CNP
2
CNP
3
Core Network
Provider Domain
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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2. NGN Architectural Frameworks
Works on RACF in ITU-T
Service Control Functions
Service Stratum
Rp
Network Attachment
Control Functions
intraintradomain
interinterdomain
Rd
Transport
Resource
Control
Function
Ru
Rt
Policy
Decision
Function
Ri
RACF
Other NGNs
Rs
Transport Stratum
Rc
Rn
Transport
Enforcement
Function
Rw
Transport Functions
o Policy Decision Function
service facing, transport independent
Policy
Enforcement
Function
RACF
Augments native transport QoS support
o Transport Resource Control Function
service independent, transport dependent,
network-segment specific
o Policy Enforcement Function
typically part of border transport elements
Preempting transport congestion at the
service control layer
Protecting ongoing premium traffic
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
Key Roles of RACF and Related Entities
Policy Decision Function
o Makes the overall admission decision
based on policy and resource availability
(including path and enforcement point
selection)
o Applies resource controls to the
transport for bandwidth allocation,
packet marking, gating, NAPT, etc.
Transport Resource Control Function
o Tracks transport resource usage and
network topology
o Resource-based admission control
o Applies L2 resource controls to the
transport
Policy Enforcement Function
o Enforces controls applied by PDF
Overall, RACF supports
Relative and absolute QoS,
including priority
Endpoints of varied QoS
control capabilities
Push and pull modes for
policy installation
Multiple transaction models
for resource requests
Various resource
management methods based
on accounting, measurement
and reservation
Existing and emerging
transport QoS mechanisms
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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2. NGN Architectural Frameworks
Implementation Scenario 1
Scenario 1: the access network and the core network belong to different
administrative domains, and the RACFs at both sides interact with the SCF
with no information exchanged in the between.
Service Control Functions
Service Stratum
Rs
Rs
Transport Stratum
Rd
RACF
PD-FE
Network
Attachment
Control
Functions
Ru
Rt
TRC-FE
Rc
PE-FE
CPE
Rp
Rt
TRC-FE
Rw
RACF
PD-FE
Rw
Rw
PE-FE
Rc
PE-FE
PE-FE
Core Networks
Access Networks
CPN
Rw
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
Implementation Scenario 2
Scenario 2：The access and the core belong to different administrative domains,
and the SCF interacts with either of the RACFs at the two sides. The RACFs in
the core and the access exchange information via the Ri reference point.
Note: The Ri reference point is to be detailed in R2.
Service Control Functions
Service Stratum
Rs
Transport Stratum
RACF
PD-FE
Network
Attachment
Control
Functions
Ru
CPN
Rt
Rc
PE-FE
RACF
PD-FE
Rt
TRC-FE
Rw
CPE
Rd
Ri
Rp
TRC-FE
Rw
PE-FE
Access Networks
Rw
Rc
Rw
PE-FE
PE-FE
Core Networks
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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2. NGN Architectural Frameworks
Implementation Scenario 3
Scenario 3: The access and the core belong to
the same administrative domain.
Service Control Functions
Service Stratum
Rs
Transport Stratum
Rd
RACF
PD-FE
Network
Attachment
Control
Functions
Rt
Ru
Rw
Rc Rw
PE-FE
CPE
Rp
Rt
TRC-FE
TRC-FE
Rw
PE-FE
PE-FE
PE-FE
Core Networks
Access Networks
CPN
Rw
Rc
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
RACF supporting End-End QoS
180 (SDP2)
CSCF
CSCF
180 (SDP2)
Invite (SDP1)
Service Info
RACF
Service Info
RACF
Invite
Invite (SDP1)
(SDP1)
RACF
RACF
DES
DES
LER
GGSN
LSR
3G RAN
LER
LSR
BRAS
LSR
ADSL
IP/MPLS Core
SIP B
SIP A
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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2. NGN Architectural Frameworks
High Level Requirements of NACF
Dynamic provision of IP address and other
user equipment configuration parameters
(e.g. using DHCP).
User authentication, prior or during the IP
address allocation procedure.
Authorization of network access, based on
user profile.
Access network configuration, based on user
profile.
Location management.
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
2. NGN Architectural Frameworks
Functional Architecture of NACF
Service Control Functions
Service Stratum
Transport Stratum
NACF
NACF
TC-Ux
S-TC1
HGWC-FE
TC-U1
TC-TC1
TLM-FE
Nc
TAA-FE
TAA-FE
PD-FE
Ne
Nk
Na
NAC-FE
Other NGNs
Nb
Ng
Nh
TUP-FE
TUP-FE
RACF
RACF
Nd
AM-FE
CPE
TC-T1
AR-FE
Transport Functions
Transport Functions
NAC-FE (Network Access Control Functional Entity)
AM-FE (Access Management Functional Entity)
TLM-FE (Transport Location Management Functional Entity)
TAA-FE (Transport Authentication and Authorization Functional Entity)
TUP-FE (Transport User Profile Functional Entity)
HGWC-FE (Home GateWay Configuration Functional Entity)
AR-FE (Access Relay Functional Entity)
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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3. IPTV Architectural Frameworks
IPTV – NGN Mapping
Applications
Service Stratum
Application Support
Functions and
Service Support Functions
Application
Functions
S. User
Profile
Functions
Other NGN
Service Components
Service
Control
Functions
IPTV Service
Component
Legacy
Terminals
Legacy
Terminals
IP Multimedia
Component
IP Multimedia
&PSTN/ISDN
Simulation
Service Component
GW
GW
Network Access
T.User
User Network Attachment
Control Functions
Profile
ProfileAttachment
Functions
(NACF)
Functions
Functions
Customer
Networks
Access
Network
Access Transport
Functions
Functions
NGN
Terminals
Edge
Functions
Resource and Admission
Control Functions
(RACF)
Other Networks
PSTN / ISDN Emulation
Service Component
Core
Transport
Core
transport
Functions
Functions
Transport Stratum
End-User
Functions
Figure 1.
Future revision of Figure 8/Y.2012: NGN components including IPTV service component
* Ref: NGN-GSI Output Document T05-NGN.GSI-0067R1
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
3. IPTV Architectural Frameworks
IPTV on NGN with distributed servers
* Ref: ATIS-0800002, IPTV Architecture Requirements
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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3. IPTV Architectural Frameworks
High level view of IPTV over NGN
* Ref: ATIS-0800002, IPTV Architecture Requirements
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
3. IPTV Architectural Frameworks
Architectural Approach
IPTV Services and Applications
IMS
Non-IMS
Non-NGN based
Environments
NGN based Environments
IP based Network Environments
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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3. IPTV Architectural Frameworks
NGN (but non-IMS) Based IPTV Delivery Architecture
Customer
Application Components
Application
Client
Transaction Protocol
IPTV
Application
IPTV Subscriber
Management
Service Support Functions
Delivery Protocol
Media
Client
Multicast Control
Distribution &
Delivery
Broadcast & VoD
NGN Service Stratum
User Profile
Functions
IPTV
Control Client
Control
Protocol
IPTV Control
Service Control Functions
IPTV Device
Customer
Transport
Authentication &
Configuration Protocol
Network Attachment
Control Functions
(NACF) [T-user Profile]
Control
Functions
Resource &
Admission Control
Functions (RACF)
NGN Transport Stratum
Delivery Network
Gateway
Functions
Access Network
Functions
Edge
Functions
Transport
Functions
Core Transport
Functions
On-going
Discussion
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
3. IPTV Architectural Frameworks
IMS Based IPTV Delivery Architecture
Customer
Application
Client
Application Components
Transaction Protocol
IPTV
Application
IPTV Subscriber
Management
Service Support Functions
Delivery Protocol
Media
Client
Multicast Control
Distribution &
Delivery
Broadcast & VoD
NGN Service Stratum
Core
IMS
Session
Protocol
Session
Client
Service Control Functions
IPTV Device
Customer
Transport
S-User Profile
Functions
Authentication &
Configuration Protocol
Network Attachment
Control Functions
(NACF) [T-user Profile]
Resource &
Admission Control
Functions (RACF)
Control
Functions
NGN Transport Stratum
Delivery Network
Gateway
Functions
Access Network
Functions
Edge
Functions
Core Transport
Functions
Transport
Functions
On-going
Discussion
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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4. Remaining Works
Remaining Works in NGN and IPTV
o NGN R1 frameworks are almost finished
• Protocol developments has been started:SG11
• NGN R2 Requirements are being developed
• FRA 2, RACF 2 and NACF also started for R2
• Need more works to support
Services/Applications over NGN
o IPTV is just being developed
• Definition, Requirements and Architecture
• Need more detailed functional studies; IPTV
service components, Middleware PF, STB etc.
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
5. Future Plan
NGN Architecture Standard Roadmap
(incorporating IPTV architecture)
Service
Service components
components
In
In Y.2012
Y.2012
The
The way
way to
to realize
realize
each
each service
service components
components
Current
In the future
IPTV(Y.20xx)
IPTV
Service Component
IMS based
Non-IMS
PIEA(Y.2031)
PSTN/ISDN Emulation
Service Component
Non-NGN ?
(Note)
IMS based
Call server
Note: Inclusion of Non -NGN
aspect in Y.20xx needs further
study.
IFN(Y.2021)
IP Multimedia
Service Component
IMS based
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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Thank you for
your attention !!!
ITU-APT Workshop, Bangkok Thailand, 16~17 March 2007
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