International Telecommunication Union
ITU-T
What is NGN: Basic Architecture
Keith Knightson
Consultant
Industry Canada
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
Outline
ITU-T
o Set scene for subsequent sessions by:
• Introducing basic concepts
• Showing high-level viewpoints
• List architectural challenges
• Summarize architectural work to date
• Show areas for further study
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
2
NGN Definition
ITU-T
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.
From ITU-T Recommendation Y.2001
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
3
Y.2011: NGN General Reference Model
ITU-T
Pre-NGN:
Vertically
Integrated
Networks
Video
Services
(TV,
movie,
etc)
Video
Services
Network
Telephony
Services
Data
Services
(WWW,
e-mail,
etc)
PSTN
Data
Services
Network
ITU-T Rec.
Y.2011
NGN:
Horizontally
Integrated
Networks
NGN Services
Stratum
NGN Transport
Stratum
Far
reaching
implications
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
4
Single Convergence Layer
ITU-T
Services Stratum
Any Service
&
Every Service
Internet Protocol
(IP)
Transport Stratum
Scope
Of
“NGN”
Any Transport
&
Every Transport Technology
Two Service Domains
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
5
Service Provision:
Mediated and non-mediated services
ITU-T
Service
Application Interconnection
&
Service
Servers
Single/Distributed
Network-based
Mediated
Services
S
Application
&
Service
Servers
Network-based
Mediated
Services
S
Non-Mediated
Services
T
Packet
Core
Network(s)
Packet
Access
Network(s)
Packet
Access
Network(s)
End
User/Application
System
Transport
Network
Interconnection
Transport
Network
Interconnection
T
End
User/Application
System
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
6
Effects of Separation
ITU-T
o Universal:
• Any service over a single IP transport network
o Side Effect:
• Two different levels of control, authentication, admission,
charging, etc.
o Challenge:
• Service to transport coupling & mapping for:
— QoS selection
— QoS control
— transport resource allocation
— monitoring
— accounting for usage
Solution: Resource & Admission Control Functions
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
7
Basic Functional View
Applications
ANI
ITU-T
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
ITU-T/OGF Workshop on Next Generation
Networks and Grids
Control
Geneva, 23-24 October 2006
Media
Management
8
ITU-T
Component
View
Service Stratum
Applications
Application Support
Functions andFunctions
Service Support Functions
Application
S. User
Profile
Functions
Other NGN Service
Components
Service
Control
Functions
IP Multimedia
Component
IP Multimedia
&PSTN/ISDN
Simulation
Service Component
GW
Legacy
Terminals
Legacy
Terminals
GW
Network
NetworkAccess
Attachment
T. User
User
Control
Functions
Profile
Profile Attachment Functions
(NACF)
Functions
Functions
Customer
Networks
AccessTransport
Network
Access
Functions
Functions
NGN
Terminals
End-User
Functions
Edge
Functions
Resource and Admission
Control Functions
(RACF)
Other Networks
PSTN / ISDN Emulation
Service Component
Core
Transport
Core
transport
Functions
Functions
Transport Stratum
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
9
Applications
Management functions
Application Support Functions & Service Support Functions
(may include own Authentication, Authorization and Accounting)
Service
control
S-5: S. User
Profile FE
S-3: Interrogating Call
Session Control FE
S-4: Subscription
Locator FE
S-15: General Services
S-12: Network Signaling
Interworking FE
S-7: Interconnection
Border Gateway
Control FE
Functional
Entity
Model
Other NGN
Control FE
S-2: Proxy Call Session
Control FE
S-11: User Signaling
Interworking FE
S-8: Access GW
Control FE
S-13: Media Resource
Control FE
T-12: T. User
Profile FE
NGN
End-User UNI
Function
T-11:
T. Authentication
&Authorization
FE
Legacy
Terminal
T-13: T. Location
management FE
T-4: Access
Relay FE
Customer
Network
T-2: Access
Node FE
T-1: Access
Media
Gateway
FE
IP
Multimedia
Networks
T-16: Policy Decision FE
T-16: Policy Decision FE
T-17: Transport
Resource Control FE
T-17: Transport
Resource Control FE
T-10:
Network Access
Configuration FE
Core transport
T-8:
Media
Resource
Processing
FE
T-14: Access Management FE
RGW
S-9: Media GW
Control FE
RACF
RACF
T-15: Home GateWay
Configuration FE
S-10: Breakout
Gateway Control FE
S-1: Serving
Call Session Control FE
NACF
Legacy
Terminal
S-6: S. Authentication
& Authorization FE
S-14: Media Resource
Broker FE
Application
*
ITU-T
NGN
Terminal
ANI
Access transport
T-3: Edge
Node FE
T-5:
Access
Border
Gateway
FE
Access Packet Transport Functions
ITU-T/OGF Workshop on
Networks
CoreNext
PacketGeneration
Transport Functions
Geneva, 23-24 October 2006
Scope of NGN
T-9:
Signalling
Gateway
FE
T-6:
Interconnection
Border
Gateway FE
T-7:
Trunking
Media
Gateway
and Grids
FE
PSTN/ISDN
10
Architectural Challenges
ITU-T
o Mobility
• Fixed to mobile convergence (FMC)
o Application-driven QoS:
•
•
•
•
Classes and their designations
Explicit bandwidth selection
Service to transport mapping & control
Flow awareness
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
11
Architectural Evolution
ITU-T
o
QoS in Access:
•
•
•
o
Distributed network control of/for QoS path:
•
•
•
o
Multiple terminals, multiple QoS
Role of Home Gateway (shaping, limiting)
Home gateway management control
Horizontal means
Vertical means
Monitoring, dynamic allocations, accounting
Network Control and Management
•
•
Protect from attack
Separation from payload paths
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
12
Fixed to Mobile convergence
ITU-T
Radio Access
Network
….
….
….
….
Base
Station
Controller
UMA-enabled
Dual Mode
Handset
GSM/IMS Core
Service
Architecture
Tunnelled
IMS stack
WiFi
RG
….
….
….
….
GANC
(UMA)
Network
Controller
IP Access
Network
Native IP
Stack
VoIP
SIP
Server
IP
Core
Transport
SIP
Fixed/wireless Telephone
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
13
Home Gateway Architecture/Functionality
ITU-T
Desktop PC
Network
Terminating
Unit
10/100
Base-T
Home
Routing
Gateway
Desktop PC
Customer
Premise
Network
Set Top Box
Television
Other
Devices,
Appliances,
etc
Set Top Box
Television
….
….
….
….
IP
phone
QoS per device/terminal
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
14
Summary of key architectural work in SG13 (1)
ITU-T
o Y.2001: NGN Overview
• NGN Definition, Characteristics & Subject Areas
o Y.2011: General Reference Model
•
•
•
•
•
High-level paradigms
Separation of concerns, services from networks
Architectural principles
OSI model relevance
G.805 relevance
o Y.2012 (Y.FRA) Functional Requirements & Architecture
• Generic service control functions
• Generic transport control functions
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
15
Summary of key architectural work in SG13 (2)
ITU-T
o Y.2021 (Y.IFN) IMS for NGN
• IMS functions
• Positioning with respect to Y.FRA
o Y.2031) Y.PIEA) PSTN/ISDN Emulation Architecture
• Call Server based emulation
• IMS based emulation
o Y.CSF: Converged Services Framework
• Service coordination across heterogenous systems and
technologies
• Overlay architecture across diverse systems
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
16
Areas for further study
ITU-T
o Streaming Services
• IPTV
o Identity based systems
• RFID
o Home Networks
• Home Gateways
• Gateway management
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
17
The End
ITU-T
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
18
Backup Slide 1
ITU-T
TC-T1
TC-T2
TC-T3
S-T2
TC-T5
TC-T6
TC-T4
S-T1 S-T3 A-T1 TC-T9 S-T5 S-T4
T-ON1
T-9:Signalling
Gateway FE
T-U1
T-4:Access Relay
FE
T-8: Media
Resource Processing FE
T-1: Access Media
Gateway FE
T-U2
T-6: Interconnection
Border Gateway FE
Core Transport Functions
T-7:Trunking Media
Gateway FE
T-U3
T-2:Access Node FE
Access Transport Functions
Access Transport Processing
T-3: Edge Node
FE
T-ON2
T-ON3
T-5:Access Border
Gateway FE
Core Transport Processing
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
19
Backup Slide 2
S-TC1
ITU-T
S-TC2
NACF
TC-Ux
S-TC3
S-TC4
S-TC5
RACF
T-15: Home GateWay
Configuration FE
T-13: T. Location
Management FE
TC-ON1
TC-TC1
T-16: Policy Decision FE
T-12: T. User
Profile FE
T-11: T. Authentication
& Authorization FE
TC-U1
T-10: Network
Access Configuration FE
T-17: Transport
Resource Control FE
T-14:
Access Management FE
TC-T1
TC-T3 (Note 1)
TC-T4 (Note 2)
TC-T2 (Note 3)
TC-T6 (Note 4)
TC-T5 (Note 3)
TC-T9 (Note 4)
Note 1: applicable when TRC-FE operates in the access network domain
Note 2: applicable when TRC-FE operates in the core network domain
Note 3: applicable when PD-FE operates in the access network domain
Note 4: applicable when PD-FE operates in the core network domain
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
20
Backup Slide 3
ITU-T
Application Support Functions & Service Support Functions
A-S1 A-S2
A-S3
A-S4
A-S5
Service Control
S-5: Service User
Profile FE
S-14: Media Resource
Broker FE
S-6: Service
Authentication
& Authorization FE
S-15 General Services
Control FE
S-U1
S-U2
S-11: User
Signaling
Interworking FE
A-S6
S-2: Proxy Call
Session Control FE
S-1: Serving Call Session
Control FE
S-4: Subscription
Locator FE
S-12 Network
Signaling
Interworking FE
S-3: Interrogating
Call Session Control FE
S-7: Interconnection
Border Gateway
Control FE
S-10 Breakout
Gateway Control FE
S-13: Media Resource
Control FE
S-TC1 S-TC2
S-T1
S-8: Access Gateway
Control FE
S-TC3
S-T2
S-ON1
S-ON2
S-ON3
S-9: Media Gateway
Control FE
S-TC4 S-T3
S-T4
S-TC5 S-T5
ITU-T/OGF Workshop on Next Generation Networks and Grids
Geneva, 23-24 October 2006
21
Applications
Backup Slide 4
A-1: AS-FE*
A-U1
A-4: SS-FE
A-3: APL-SCM-FE*
A-2: APL-GW-FE*
A-S1 A-S2
A-S3
A-S5
S-6: SAA-FE
A-S6
S-5: SUP-FE
UNI
S-15: GSC-FE
End User
Functions
S-1: S-CSC-FE
S-4: SL-FE
S-13: MRC-FE
Note: * may include
ITU-T/OGF Workshop on Next Generation Networks and Grids
23-24 October 2006
Authentication, Authorization, Geneva,
and Accounting
Transport
Processing
Functions
T-9: SG-FE
A-T1
Service Control
Functions
S-14: MRB-FE
A-S4
Application Support Functions
and Service Support Functions
ANI
ITU-T
22