Download 6. Next Generation Networks A. Transition to NGN B. Key

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
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)
Convergence of Telephony World and Internet World
Transition to NGN: Second wave
• Ongoing trend towards integration & interoperability of IPbased 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
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”
Transition to NGN: Third wave
Today
Tomorrow
Internet
Telephone
network
Mobile radio
network
IP-Network
Multimedia Access - Advantages
• easy to handle
• reliable
• mobile
One network for everything
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.”
B. Key drivers of NGN development
Situation Today
Target Solution
Voice
The Unified
Multi Service
Network
FR
...
ATM
IP
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
...
ATM
IP
A new network concept
supporting voice in a packetized environment
is required
The Next Generation Network
Unified network: data migration
Voice
The Unified
Multiservice
Network
FR
...
ATM
IP
Pure technology/standardization matter:
Transport of different data services
over a unique data backbone
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
Example NGN Service Drivers
Driven by
Cost Reduction
Possibilities
Driven by
Revenue Increase
Possibilities
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 E-mail
• 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
D. NGN architecture
•Evolution of network architecture
– Traditional telephony - Circuit switch based PSTN
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
D. NGN architecture (Cntd.)
•Evolution of network architecture (Cont.)
– Comletely IP-oriented network
D. NGN Architecture (Cntd.)
Convergence of network technologies and
media
Nx64 kbps
D. NGN architecture (Cntd.)
System Management Servers
Management
Application
Servers
Applications
Control
Softswitches
Signaling
gateways
Core
Edge
Access
Mobile
UTRAN
Enterprise Customers
Packet Network
Media
Gateway
Media
Gateway
Broadband
DSL
Cable
Remote Office/SOHO
PSTN
CO
WLL
Residential
Users
Mobile
Users