slides on advance tecnology next generation network

1. Next Generation Network
Introduction Lecture
By
Dr. Syed Mushhad Gilani

2. Agenda
•  Introduction
•  Existing Network Infrastructure and convergence towards the NGN
•  NGN: Definition and Architecture
•  NGN and Protocols
•  NGN Services
•  Conclusions

3. Introduction
• Today, telephony, the Internet, and the cellular mobile networks
continue to be different domains, each has its own protocols and
services.
• NGN will be the foundation for the creation of a new range of
multimedia applications that takes full advantage of the
characteristics of the broadband network and the “always on”
capability.

4. General Idea
• The general idea behind the NGN is that one network transports all
type of data and provide services (voice, data, and all sorts of media
such as video) by encapsulating these into packets, similar to those
used on the Internet.
• NGNs are commonly built around the Internet Protocol (IP), and
therefore the term all IP is also sometimes used to describe the
transformation toward NGN.

5. NGN ITU-T’s Definition
• “ A next-generation network (NGN) is a packet-based network which
can provide services including Telecommunication Services and able
to make use of multiple broadband, quality of Service-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 unrestricted
provision(access) of services to users. “

6. NGN definition and basic features
• A NGN is 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 enables unfettered access for users to networks and to competing service providers
and/or services of their choice. It supports generalized mobility which will allow consistent
and ubiquitous provision of services to users.

7. Convergence Towards the NGN
• Today’s network is divided into:
• The Public Switched Telephone Network,
• The packet Switched Networks(e.g. the Internet) and
• The Mobile networks.
• Convergence is the process of interconnection of traditional switched
circuit networks (the PSTN and mobile networks) and packet-switched
networks based on the Internet Protocol (IP) for routing.

8. NGN Architecture
• A basic architecture was defined comprising Network Elements
needed for the provision of traditional Telephony services.
• Each element has distinct roles within the network and is designed to
integrate horizontally with other elements in the same layer, as well
as vertically with the function-based elements of the other layers.
• The Next Generation Networks architecture is based on four layers:
Access layer, Core layer, Control layer and Service layer.

9. NGN Layers
• 1-Access layer elements includes different Media Gateways that
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

10. NGN Layers

11. The unifying IP convergence layer

12. NGN separation of services from transport [Y.2011]

13. Connectivity to NGN

14. An example of NGN implementation
(Layered Architecture)

15. Some key NGN architectural challenges
• Application-driven QoS:
• QoS classes
• Explicit bandwidth selection
• Mapping & control from Service to Transport
• Flow awareness (monitoring, accounting)
• Mobility
• Seamless handover
• Fixed Mobile Convergence (FMC)
• Scalability
• Multicast
• Ubiquitous networking
• Flexibility
• Support of new services and business models

16. NGN & Protocols
• Next Generation Networks require new protocols to support
converged networks.
• Requirements
• Support for legacy PSTN interworking, Migration Plan from legacy to
NGN, High availability, Lifeline services and Scalability
• With so many protocols, which one to choose?
• H.323,SIP(Session Initiation Protocol), MGCP(Media Gateway Control
Protocol), SIGTRAN

17. NGN Services
• Several services that will be important drivers in the NGN
environment are:
• 1-Voice Telephony: 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.

18. NGN Services
• 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.

19. NGN Services
• 7-Unified Messaging: Supports the delivery of voice mail, email, fax mail,
and pages through common interfaces.
• 8-E-Commerce: Allows consumers to purchase goods and services
electronically over the network.
• 9-Call Center Services: A subscriber could place a call to a call center agent
by clicking on a Web page.
• 10-Interactive gaming: Offers consumers a way to meet online and
establish interactive gaming sessions.
• 11-Home Manager: These services could monitor and control home
security systems, energy systems, home entertainment systems, and other
home appliances.

21. Conclusion
• Next generation networks are not just a PSTN replacement but at a
minimum they must provide the equivalent voice quality and
reliability of today’s PSTN.
• The NGN will be the foundation for the creation of a new range of
multimedia applications that take full advantage of the characteristics
of the broadband network and the “always on” capability.
• The creation of the NGN is no overnight transformation, but it is an
evolution that is already underway and gathering pace.
• The NGN is the shift from separate application-specific networks to a
single network capable of carrying any and all services.