International Telecommunication Union
Evolution to NGN
Ghassem Koleyni
Nortel Networks
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
Evolution & Revolution
ITU-T
Evolution (Migration)
A gradual process of change and
development
Abrupt (Revolution)
A rapid process of change and development
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
2
What is Expected of the Evolution to
NGN -I
ITU-T
o Scalability
o Higher reliability and trustworthiness
o Higher resiliency
o Security
o Robustness
o Performance
o Ubiquity
o Simplified authentication and billing
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
3
What is Expected of the Evolution to
NGN -II
ITU-T o Richness in content and application
o Common services infrastructure
o Simplified service deployment
o Higher capacity
o Interoperable
o Operable between Fixed, Mobile, Copper,
Fibre, Wireless…….
o Multimedia
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
4
What is Expected of the Evolution to
NGN -III
ITU-T o Mix of traditional circuit switched
communication services and IP services
o End-to-end interactivity
o User control
o Affordable
To achieve these expectations there is a need
for:
Compliance of Networks to Sets of
Globally Recognized Open Standards
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
5
FGNGN Evolution Working Group
(WG6)
ITU-T Where, at present, sets of drafts on the evolution
of PSTN/ISDN to NGN are being produced
Our mandate:
To prepare a set of standards to drive the
evolution of existing networks towards NGN,
taking into consideration that there are
potentially different approaches. This work is
undertaken based on aspect of network
evolution and interworking principles.
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
6
WG6 Activities
ITU-T
Evolution of networks to NGN
PSTN/ISDN emulation
PSTN/ISDN simulation
Mixture of emulation and simulation
Interworking between PSTN/ISDN and
Simulated PSTN/ISDN
o Emulation and Simulation when PBXs are
involved
o
o
o
o
o
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
7
Evolution of Networks to NGN
ITU-T
dates
Major investment has been made in existing
networks. Today’s mix of technologies has
produced different life span and thus
amortization times for different parts of the
networks. Thus, complete replacement of the
legacy networks to NGN is neither advisable nor
possible. So, a phased approach needs to be
considered.
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
8
Note on the following configurations
ITU-T o The following are a subset of scenarios
presently under discussion in FGNGN. The
relationship between the entities identified
in the scenarios and those defined in the
NGN framework architecture is work in
progress
o The intent is to use existing protocols to
advantage. Protocol extensions or evolution
would continue to be handled as they are
today.
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
9
A Step-by-Step Evolution Scenario I
ITU-T
UAM
UAM
AN
LE
LE
PSTN network
PBX
AN
PBX
TE
TE
TE
UAM
UAM
AN
LE
LE
AN
PBX
UAM
UAM
AN
LE
LE
PSTN network
PBX
AN
PBX
TE
TE
TE
RUAM
RUAM
AN
AN
PBX
PBX
CS
AN
PBX
AN
Packet Based
Network
AG
UAM
RUAM
AG
PBX
UAM
RUAM
TG
SG
voice
signaling
VoIP
BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
10
A Step-by-Step Evolution Scenario II
UAM
ITU-T
UAM
AN
LE
LE
PSTN network
PBX
TE
TE
AN
PBX
TE
UAM
UAM
AN
LE
LE
AN
PBX
PBX
UAM
UAM
PSTN network
AN
LE
TE
TE
LE
AN
PBX
PBX
AN
AG
SG
CS
TG
Packet Based
Network
PBX
TG
AN
AG
PBX
AG
CS
AN
AN
AG
AG
PBX
Packet Based
Network
AN
AG
PBX
AN
AG
PBX
PBX
TG
SG
voice
signaling
VoIP
BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
11
PSTN/ISDN Emulation & Simulation
ITU-T
Emulation
o Provision of PSTN/ISDN service
capabilities and interfaces using
adaptation to an IP infrastructure.
Simulation
o Provision of PSTN/ISDN-like service
capabilities using session control over IP
interfaces and infrastructure
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
12
PSTN/ISDN Emulation
ITU-T
IF
IF
NGN
Originating
legacy terminal
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
Terminating
legacy terminal
13
PSTN/ISDN Simulation
ITU-T
IF1
IF2
NGN
End system
dates
Originating
network
IF3
NGN
IF4
NGN
Originating Originating
Transit Subscriber’s
network
home
network
IF4
NGN
Core
Transit
network
IF3
NGN
IF2
NGN
IF1
NGN
Terminating Terminating Terminating
Subscriber’s Transit
network
home
network
network
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
End system
14
Combination of PSTN/ISDN
Emulation & Simulation
ITU-T
IFx
IFy
NGN
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
15
Interworking Between PSTN/ISDN
and Simulated PSTN/ISDN
ITU-T
IFx
IFy
ISDN/PSTN
End System
dates
IF4
NGN
Core
Transit
network
IF3
NGN
IF2
NGN
Terminating Terminating
Subscriber’s
Transit
home
network
network
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
IF1
NGN
Terminating
network
End System
16
PSTN/ISDN Simulation Involving
PBXs
ITU-T
IF4
NGN
PBX
dates
IF2
IF3
IF2
IF1
NGN
NGN
NGN
NGN
Originating
network
Originating
subscriber’ s
home
network
Terminating
subscriber’s
home
network
Terminating
network
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
17
So, NGN Would Be!
ITU-T
Multimedia
Integrated voice,
video and data
Ubiquitous
Anywhere,
Anytime
Evolved
Network
Secure
Trustworthy
Network
Interactive
end-to-end
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
18
And Finally….
ITU-T
The future is an access- and locationindependent, secure, packet-based
telecommunications infrastructure that
synergistically delivers on maximizing the
strengths of both the Internet and the Legacy
Infrastructures
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
19
List of Acronyms
ITU-T
dates
AG
AN
CS
ISDN
LE
PBX
PSTN
QoS
RUAM
SG
TE
TG
UAM
Access Gateway
Access Network
Call Server
Integrated Services Digital Network
Local Exchange
Private Branch Exchange
Public Switched Telephone Network
Quality of Service
Remote User Access Module
Signalling Gateway
Transit Exchange
Transit Gateway
User Access Module
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
20
ITU-T
Thank you for your
attention
dates
ITU-T Workshop on NGN (jointly organized with IETF)
Geneva, 1-2 May 2005
21