New Technology Series – Introduction to NGN (Next Generation Network)

Introduction to NGN (Next Generation Network)

Next Generation Network (NGN) is called New Generation Network some time. NGN is a broad term used to describe key architectural evolutions in telecommunication core and access networks. General idea behind the NGN is that one network transports all information and 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, and therefore the term all IP is also sometimes used to describe the transformation toward NGN.

•    Increased demand for bandwidth is not possible through existing PSTN.
•    Requirement for new services.
•    Telecom operators wants to reduce the OPEX and CAPEX (Need one common network for all services).
•    Future proof network to handle Voice, Data and Multimedia.
•    Optimising and simplifying transmission links.

What is NGN?
•    NGN is Voice Over IP, bypassing the regular switches to save the investment on Switches and Trunks.
•    NGN is network convergent technology, combining wireline (PSTN), wireless (GSM, CDMA and 3G) and packet data network together, for integrated voice, data and multimedia services.
•    NGN is a flat telephone network over Packet Data Network, instead of traditional Hierarchy structured telephone network with reduced investment.

Centralized vs Distributed Architecture

Compare two System Architecture

Characteristics of NGN
    Packet-based transfer
    Separation of control functions among bearer capabilities, call/session, and application/ service
    Decoupling of service provision from network, and provision of open interfaces
    Support for a wide range of services and applications
    Broadband capabilities with end-to-end QoS

Characteristics of NGN
    Interworking with legacy networks via open interfaces
    Generalized mobility
    Unrestricted access by users to different service providers
    Converged services between Fixed/Mobile
    Compliant with all Regulatory requirements, for example concerning emergency communications and security/privacy, etc

NGN Solution Benefits

Evolution from PSTN to NGN

NGN Architecture
•    Characteristics of Next Generation Network:
•    NGN is designed with an open network framework.
•    NGN adopts the hierarchical architecture, which is divided into media access layer, transport layer, control layer and service/application layer.
•    NGN is based on standard protocols and packet switching network.

NGN Hierarchical Architecture

Access Layer
•    Interworks between Core Packet Transport layer and various existing communication networks.
•    Provides access of various communication terminals such as analog phone, SIP Phone, PC Phone visual terminal and intelligent terminals to the Core Packet Transport layer via various access gateways
Core Transport Layer
The packet switching network composed of backbone transmission equipments such as IP router or broadband ATM switch as the bearer basis of the softswitch system.

NGN Control Layer
•    The control Layer combines the equipment that manages signaling and call control progress.
•    The control handles the call setup and controls the media gateways.
•    Major components at this layer are the soft-switches.
Application Layer
Layer with various applications and services such as client oriented integrated intelligent services and service customization.

NGN Network Architecture


  1. good news for ptcl emply

  2. Malik Iftikhar Ahmad says:

    nice information for ptcl workers.

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