Service digital network

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NGN
Chapter 10
Next-Generation Networks
(NGN)
Korea-Vietnam Friendship IT College
NGN
Overview
• Introduction
• NGN definitions
• NGN Architecture
• NGN Protocol Layers
• NGN services
• NGN and QoS
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Introduction
Today’s network is divided into: The Public Switched Telephone
Network, The Packet Switched Networks (e.g. the Internet) and The
Mobile networks.
Variety of networks
 e.g. PSTN  e.g. GSM  e.g. Internet
Services
Services
Services Services
Services
Services
Central Functions
Central Functions
Control Control
Control
Control Control
Control
Transport
Transport
Transport Transport
Transport
Transport
Access Access
 fixed voice  mobile voice  different services
 circuit switched  circuit switched  packet switched
 monolithic structure  monolithic structure  modular structure
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Issues
• The legacy problems:
– The public telephone network (PSTN), Mobile
Network was designed for voice traffic, but now
carries increasing data volumes.
– Data networks originally built for delay insensitive
computer-to-computer transactions, now need to
support real-time services.
•  Convergence of Network
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Network Convergence
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NGN
NGN Definitions
packet-oriented
network
integration of support broad
existing variety of services
infrastructure
NGN
concept
application focused openness and
- access flexibility regarding
independent new services
separation into
different layers
using open
interfaces
A Next Generation Network can be defined by six key criteria.
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NGN ETSI’s Definitions
“NGN is a concept for defining and deploying networks,
which, due to their formal separation into different layers
and planes and use of open interfaces, offers service
providers and operators a platform which can evolve in a
step by step manner to create, deploy and manage
innovative services.”
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IP based NGN
Variety of services
Voice over IP
Data
Multimedia
An IP-based NGN is able to support a broad variety of services
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NGN Architecture
• Basic NGN architecture
• NGN components
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Basic NGN Architecture
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NGN Components
• Media Gateway: Translates between media formats of
the access network and the NGN packet network
• Call server: controls the media gateway according to a
call control model and signalling handling.
• Media server: provides functions to enable callers and
applications to interact through telephony devices.
• Application server: web-based application server to
execute services controlling call servers
• Application creation environment: support the full life-
cycle or a service or application
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NGN
NGN Protocol Layers
NGN Protocol Layers
Service Layer
Value Added Service Creation
Control layer
Basic control service
Core layer
Packet Based Transport
Access layer
Access Networks
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NGN Protocol Layers
1- Access layer: support connection to and from the access
network with the core network.
2- Core layer: is the network handling converged services
based on IP.
3- Control layer: is the call server that provides call control
functions and also provides the control of the Media
Gateway.
4- Service layer: is an IT platform that plays the role of an
IN-SCE (Intelligent Network Service Creation
Environment) extending their functionality in order to
cover the new network scenarios
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NGN Network Implementation
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NGN Services
1-Voice Telephony: e.g. Call Waiting, Call Forwarding, 3-
Way Calling
2-Voice Portal: provide callers with anywhere, anytime
access to information like news, weather, stock quotes,
and account balances using simple voice commands and
any telephone,..
3-Data services: bandwidth-on-demand, connection
reliability/resilient, …
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NGN Services (2)
4-Multimedia services: This allows customers to converse
with each other while displaying visual information.
5-Virtual Private Networks: allow large, geographically
dispersed organizations to combine their existing private
networks with portions of the PSTN, thus providing
subscribers with uniform dialing capabilities.
6-Public Network Computing: Provides public network-
based computing services for businesses and consumers
(e.g, to host a web page, store/maintain/backup data files,
or run a computing application).
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NGN Services (3)
7-Unified Messaging: Supports the delivery of voice mail,
email, fax mail, and pages through common interfaces .
8-Information Brokering: Involves advertising, finding, and
providing information to match consumers with
providers.
9-E-Commerce: Allows consumers to purchase goods and
services electronically over the network.
10-Call Center Services: A subscriber could place a call to a
call center agent by clicking on a Web page.
11-Interactive gaming: Offers consumers a way to meet
online and establish interactive gaming sessions.
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NGN Services (3)
12-Distributed Virtual Reality: Refers to technologically
generated representations of real-word events, people,
places, experiences, etc., in which the participants in and
providers of the virtual experience are physically
distributed.
13-Home Manager: These services could monitor and
control home security systems, energy systems, home
entertainment systems, and other home appliances.
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NGN and QoS
• QoS provision
• QoS support
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QoS Provision
• An underlying backbone
transport is required (for
example, SONET/SDH
over optical fibre or radio)
• Backbone resource control
protocols such as GMPLS
with RSVP-TE or CR-
LDP can be used to
provide support for
resource allocation
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