1. 6. Next Generation Networks A. Transition to NGN B
6. Next Generation Networks A. Transition to NGN B. Key drivers of NGN development C. Transport mechanism of the unified network D. NGN architecture E. Main NGN building blocks F. NGN protocols G. NGN as converged networks: concluding remarks

2. A. Transition to NGN: First wave
Growth of Internet and other IP-based networks with their
requirements for bandwidth and capacity has driven rapid
innovation in telecommunication access and transport networks
Examples:
– leveraging copper wire “last-mile” networks
through digital subscriber line (“DSL”) technologies
– re-architecturing of cable networks to support IP ‑
services
– advances in optical networking technologies (e.g.
PON)

3. Convergence of Telephony World and Internet World

4. Transition to NGN: Second wave
Ongoing trend towards integration & interoperability of IP-
based and PSTN network services and applications
• Emergence of differentiated Quality of Service IP-based services
• Managed end-to-end performance needed for new applications
requiring real-time traffic (e.g., video, voice)
• New network management, QoS, traffic engineering, pricing &
accounting models

5. Transition to NGN: Third wave
Evolution of current PSTN, mobile, wireless and
IP-based networks to unified Next Generation Networks
providing both Internet and carrier-grade telecommunications
networks and services offerings with QoS
Transition to Third wave:
Ubiquitous & Pervasive Networks
– anybody, anytime, anywhere
Global Information Infrastructure (GII) – ITU, 1995
EII ETSI Project (1995)
ITU NGN 2004 Project
Y.1xx ITU-T – SG 13 “NGN – Architecture, Evolution and Convergence”

6. One network for everything
Transition to NGN: Third wave
Today
Tomorrow
Internet
Telephone
network
IP-Network 1
Mobile radio
network
Multimedia Access - Advantages:
easy to handle
reliable
mobile 2
One network for everything 3

7. ITU-T definition of NGN (Feb 2004)
“A Next Generation Network (NGN) is a packet-based network
able to provide services including Telecommunications 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 offers unrestricted access by users to different service
providers. It supports generalized mobility which will allow
consistent and ubiquitous provision of services to users.”

8. B. Key drivers of NGN development
Situation Today
Target Solution
Voice
The Unified
Multi Service
Network FR IP
...
ATM

9. Unified Network: voice migration
Some what more complex
- From circuit switched to packet switched
- Voice switches need to disappear in the long term
Voice
The Unified
Multi Service
Network FR IP
...
A new network concept
supporting voice in a packetized environment
is required
The Next Generation Network
ATM

10. Unified network: data migration
Voice
The Unified
Multiservice
Network
Pure technology/standardization matter:
Transport of different data services
over a unique data backbone FR IP
...
ATM

11. B. Key drivers of NGN development (Cntd.)
Short Term objective: Create new revenue possibilities
Removal of boundaries between voice and data opens the way to new kind of services
Can be realized relatively quickly with limited investments
Long Term objective: Realize cost savings
Simpler network
More efficient network
Cheaper network components
Full benefit only realized when all separate networks have fully migrated towards to the target solution

12. Example NGN Service Drivers

13. Next Generation Network
Driven by
Cost Reduction
Possibilities
Driven by
Revenue Increase
Possibilities
Next Generation Network

14. C. Transport mechanisms of the unified network
The unified network will use packet-based technology as the common transport mechanism
Data is the fastest growing segment due to
Success of Internet
Growing use of
Growing data traffic between business users
Data should be handled in the most efficient way
Packet technology is the best way to transport data
Packet technology is only technology that allows simultaneous delivery of different information streams towards one and the same end-point on one single connection

15. D. NGN architecture Evolution of network architecture
– Traditional telephony - Circuit switch based PSTN

16. D. NGN architecture (Cntd.)
• Evolution of network architecture (Cont.)
– Circuit Switched PSTN + Packet Switched IP network (VoIP Gateway)
SG – Signaling gateway
MGC – Media gateway controller
MG – Media gateway

17. D. NGN architecture (Cntd.)
Evolution of network architecture (Cont.)
– Comletely IP-oriented network

18. D. NGN Architecture (Cntd.)

19. Convergence of network technologies and media
Nx64 kbps

20. D. NGN architecture (Cntd.)
System Management Servers
Management
Application Servers
Applications
Control
Softswitches
Signaling gateways
Packet Network
Core
Mobile
Media Gateway
Edge
Media Gateway
PSTN
Broadband
Access
UTRAN CO
DSL
Cable
WLL
Enterprise Customers
Remote Office/SOHO
Residential Users
Mobile
Users