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International Telecommunication Union
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Evolution to NGNEvolution to NGN
Ghassem KoleyniNortel Networks
2dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Evolution & Revolution
Evolution (Migration)
A gradual process of change and development
Abrupt (Revolution)
A rapid process of change and development
3dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
What is Expected of the Evolution to NGN -I
o Scalabilityo Higher reliability and trustworthiness o Higher resiliencyo Securityo Robustnesso Performanceo Ubiquity o Simplified authentication and billing
4dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
What is Expected of the Evolution to NGN -II
o Richness in content and applicationo Common services infrastructure o Simplified service deploymento Higher capacityo Interoperable o Operable between Fixed, Mobile, Copper,
Fibre, Wireless…….o Multimedia
5dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
What is Expected of the Evolution to NGN -IIIo Mix of traditional circuit switched
communication services and IP serviceso End-to-end interactivityo User control o Affordable
To achieve these expectations there is a need for:
Compliance of Networks to Sets of Globally Recognized Open Standards
Compliance of Networks to Sets of Globally Recognized Open Standards
6dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
FGNGN Evolution Working Group (WG6)
Where, at present, sets of drafts on the evolution of PSTN/ISDN to NGN are being produced
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.
Our mandate:
7dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
WG6 Activities
o Evolution of networks to NGN o PSTN/ISDN emulationo PSTN/ISDN simulationo Mixture of emulation and simulationo Interworking between PSTN/ISDN and
Simulated PSTN/ISDNo Emulation and Simulation when PBXs are
involved
8dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Evolution of Networks to NGN
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.
9dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Note on the following configurations
oThe 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
oThe intent is to use existing protocols to advantage. Protocol extensions or evolution would continue to be handled as they are today.
10dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
A Step-by-Step Evolution Scenario -I
voicesignalingVoIP
BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN
AG
AN
PBXAG
AN
PBX
TG SG
Packet BasedNetworkUAM UAM
RUAM RUAM
CS
PSTN network
RUAMTE TE TE
UAM
AN LE
PBX
RUAM
AN
PBX
LE
UAM
AN
PBX
AN
PBX
TE TE TE
UAM
AN LE
PBX
UAM
AN LE
PBX
LE
LE
UAM
AN
PBX
UAM
AN
PSTN network
11dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
A Step-by-Step Evolution Scenario -II
TE TE TE
UAM
AN LE
PBX
UAM
AN LE
PBX
LE
LE
UAM
AN
PBX
UAM
AN
PBX
PSTN network
LE TE TE LE AN
UAM
AN
PBX
UAM
PBX
PSTN network
Packet BasedNetwork
TG
AGAN
PBXAG
AN
PBXAG
CSTGSG
voice
VoIPsignaling
AN
PBX
AG
AG
AG
AGAN
PBX
TG SG
BEARER AND SIGNALING TRAFFIC FROM OTHER OPERATOR’S PSTN/ISDN
Packet BasedNetwork
CSAN
PBX
AN
PBX
12dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
PSTN/ISDN Emulation & Simulation
EmulationoProvision of PSTN/ISDN service capabilities and interfaces using adaptation to an IP infrastructure.
SimulationoProvision of PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure
13dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
PSTN/ISDN Emulation
IF
NGN
IF
Originating legacy terminal
Terminating legacy terminal
14dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
PSTN/ISDN Simulation
IF1
Originating network
Originating Subscriber’s
home network
IF2
End system
Terminating Subscriber’s
home network
Terminating network
End system
Core Transit network
NGN NGN NGN NGN NGN NGN NGN
IF3 IF4 IF4 IF3 IF2 IF1
Originating Transit network
Terminating Transit network
15dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Combination of PSTN/ISDN Emulation & Simulation
IFx
NGN
IFy
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ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Interworking Between PSTN/ISDN and Simulated PSTN/ISDN
Terminating Subscriber’s
home network
Terminating network
ISDN/PSTN
IFy IF4 IF1
NGN NGN NGN NGN
Terminating Transit network
Core Transit network
IF3 IF2 IFx
End System End System
17dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
PSTN/ISDN Simulation Involving PBXs
IF4
NGN
Originating network
NGN NGN NGN
Originating subscriber’ s
home network
Terminating subscriber’s
home network
Terminating network
IF2 IF3 IF2 IF1
NGN PBX
18dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
So, NGN Would Be!
EvolvedNetwork
UbiquitousAnywhere,
Anytime
MultimediaIntegrated voice, video and data
SecureTrustworthy
Network
Interactiveend-to-end
19dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
And Finally….
The future is an access- and location-independent, secure, packet-based telecommunications infrastructure that synergistically delivers on maximizing the strengths of both the Internet and the Legacy Infrastructures
20dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
List of Acronyms
AG Access GatewayAN Access NetworkCS Call ServerISDN Integrated Services Digital NetworkLE Local ExchangePBX Private Branch ExchangePSTN Public Switched Telephone NetworkQoS Quality of ServiceRUAM Remote User Access ModuleSG Signalling GatewayTE Transit ExchangeTG Transit GatewayUAM User Access Module
21dates
ITU-T
ITU-T Workshop on NGN (jointly organized with IETF)Geneva, 1-2 May 2005
Thank you for your attention