Next Generation
Network (NGN)
Brief Explanation/Definition of NGN
ITU-T recommendation Y.2001 identified a definition of NGN as
explained below.
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 offers unfettered
access by users to different service providers. It supports
generalized mobility which will allow consistent and ubiquitous
provision of services to users.
And this recommendation further specifies key features of NGN as
follows:
• Packet-based transfer
• Separation of control functions among bearer capabilities,
call/session, and application/ service
• Decoupling of service provision from transport, and provision of
open interfaces
• Support for a wide range of services, applications and
mechanisms based on service building blocks (including real time/
streaming/ non-real time services and multi-media)
• Broadband capabilities with end-to-end QoS (Quality of Service).
• Interworking with legacy networks via open interfaces
• Generalized mobility
• Unfettered access by users to different service providers
• A variety of identification schemes
• Unified service characteristics for the same service as
perceived by the user
• Converged services between Fixed/Mobile
• Independence of service-related functions from underlying
transport technologies
• Support of multiple last mile technologies
• Compliant with all Regulatory requirements, for example
concerning emergency communications, security, privacy, and etc.
Focus Group
on Next generation Network (FGNGN) was been created under ITU-T
Study Group 13 on 23 June 2004 to address the emerging needs for
global standards for NGN. FGNGN was made-up of seven working groups:
-
Services and
capabilities
-
Functional
architecture and requirements
-
Quality of
service (QoS)
-
Control aspects
-
Security issues
-
Migration of
current networks into NGN
-
Future
packet based network requirements
Figure.
NGN architecture overview (Source ITU)
ITU-T NGN FG Proceedings
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