1.1.2ngn overview &architecture

7/28/2019 1.1.2NGN Overview &Architecture

1/72

NGN

Next Generation Network


2/72


3/72

AGENDA

What is current generation network

Why Next Generation networks required

What is NGN ?

Architecture of NGN


4/72

What is current generation

network


5/72

CGN

Today al most all telecommunication companiesare maintaining at least three kinds of basic

Network.

1. PSTN: (Public switched Telephone network) Public Switch Telephone Network was basically

developed and engineered for giving voiceconnectivity to the wire line subscribers.

The network consists of Local exchange/RSU as apart of Access Network and TAXs as a part ofcore Network.


6/72

CGN

2.PLMN: (Public Land Mobile Network):

PLMN has been developed to provide voice

services with wireless access.

PLMN includes BTS/BSC as access

network and MSC as a core Network.


7/72

CGN

3. Data Network:

The basic and most popular application of

data networks is Internet . Data network is built up of routers, which

are responsible for forwarding information

from one end to other. Switching Technology implemented is

Packet switching.


8/72

TodaySeparate Service Networks

Separate Access Transport & Switching Networks

INET

otherData

/IPNetworks

PLMN

PSTN/ISDN

Services

Current Scenario


9/72

Current Generation Network(PSTN)

Level-I TAXs at 21 locations (LDCCs)

Level-II TAXs at 301 locations (LDCCs).Total No. of LDCCs - 322

Tandem / Transit Switches at Big Cities / SDCClocations (2325 locations)

Total No. of SDCCs 2647

Evolved over a period of last 100 years.

Optimized for VOICE - call and not for data.

Uses circuit Switching


10/72

Current Generation Network

SDH/DWDM Network

Level-I & II TAX Switches

Local Exchanges, GSM & CDMA

Customers Customers

Level-I & II TAX Switches

Local Exchanges


11/72

MOBILE NETWORK& DATA NETWORK

MOBILE NETWORK

Having MSCs, BSCs, BTSs etc

Packet core network consisting of SGSN and

GGSNConnectivity with the PSTN only at Lev-I TAX

DATA NETWORK

Having NIB nodes at circle/SSA/SDCA level

Connectivity at local exchange level


12/72

NGN Vision

Next Generation Network is the framework where operatorwill have a common transport network based on packetswitching for providing all kinds of telecommunicationservices.

Hence operators will have to install and maintain only asingle network, which will reduce its CAPEX and OPEXsignificantly.

Moreover service provisioning will become easier becauseof the introduction of new and intelligent servers.

NGN is able to provide Vendor independence because ofthe standard protocols it uses for interaction with networkelements.


13/72

Gateways

Internet

Wireless Telephone

System

Integrated

Services

Over IP

Evolving towards IP Communications

Next Generation Networks (NGN)Present Day Networks

Next generation networks


14/72

Each service has its own network Multiplied operational

costs

Each network managed separately

No service interaction

Multiple customer profiles

Seamless service linkage

All services over anyaccess

One network for any service

Unified managementstructure

Single customer profile

Today New Service Networ k

Private Data

Internet Deep Access

Services EdgeMulti-service Aggregation

MPLS Core

OSS OSS OSS OSS OSS OSS

Mobile

NB Voice

WAN

Customer Customer

Migrate

NGN Concept

Video


15/72

MAJOR DRIVING FORCE

BEHIND NGN Individualization of communication

Customization of services

Generalized mobility:

Multiplicity of terminal:

Overlapping of professional & privatedomain


16/72

NGN

NGN refers to the convergence of differenttelecom services.

i.e. voice, data and video over a unifiedpacket network utilising IP.

Packet switching and transport elements are

routers, switches and gateways . In case of BSNL MPLS edge routers and

core-routes constitute the core network.


17/72

FEATURES OF NGN

Packet-based network

Very High-Speed Network from access

to core

Network providing generalized mobility

Unified and Universal Networks

Centralized Control

Open Interfaces


18/72

How NGN is different from CCS 7 network?


19/72

Call Control

Switching

Interfaces

Transit

Call Control

Switching

Interfaces

Call Control

Switching

Interfaces

LocalExchange

LocalExchange

BearerBearer

Circuit Switching (CCS)

Call Control

Switching

Interfaces

Signaling Signaling

STP


20/72

Call Control

Transit

Call Control

Switching

Interfaces

Call Control

Switching

Interfaces

LocalExchange

LocalExchange

BearerBearer

EVOLUTION TO NGN

Signaling SignalingSignaling

Transfer

Bearer

Transfer


21/72

Interfaces

Switching

Call Control Call Server

IP/MPLS

Gateways

Central Office

SwitchNGN Components

NGN Concept w.r.t. Voice Services

SDH

Transport

with Overlay

packets for

data

Common IP MPLS Transport


22/72


23/72

NGN Architecture


24/72

Managem

ent

NGN Architecture

Control

Service

Transport

Access


25/72

NGN

Architecture

using Softswitch


26/72


27/72

Access Layer

Access Layers is responsible for direct subscriberattachment function.

NGN can support all kind of existing access as

well as upcoming access. In fact NGN does notmatter about type of access.

NGN is capable of processing traffic originatedfrom PSTN, GSM, CDMA, xDSL, WiMAX or

any other access system. Depending upon the type of access, protocol

conversion and/or media conversion may berequired at the NGN Gateways.


28/72

Access Layer

Access Layer consists of Gateways.

Examples of gateways are

Media Gateway, (Trunk media Gatewayand Line media Gateway)

Access gateway and

Signaling gateway.


29/72

Access Layer

Media gateway terminates media, coming

from PSTN/PLMN in E1 / STM.

Here it is responsible for packetisation ofmedia under the instruction of control layer.

After packetisation of information it throws

packets to the transport Network.


30/72

Access Layer

Subscriber can directly be terminated in AccessGateway.

All the required configuration of such subscribersshould be done at control layer.

Access Gateway and Media Gateways areresponsible for carriage of Media

Signaling gateway is carrying signaling generatedby PSTN and informs Control Layer about thesignaling in required format.


31/72

Media Gateway

The MG performs the task of packetizing voice

and providing connections from switched circuits

(TDM) to packetized circuits (IP). The MG is responsible for media conversion,

resource allocation and resource management, and

event notifications.

It is responsible for reporting events to the media

gateway controller(MGC) within its zone.


32/72

Media Gateway

Between Media Gateways (MGs) and

Media Gateway Controllers (MGCs) the

protocol used is Megaco/H.248. RTP/RTCP protocol is used between two

MGs for packetized bearer traffic.


33/72


34/72


35/72


36/72

Transport Layer

Provide the connectivity for allcomponents .

Provide support for the transfer of mediainformation, as well as the transfer ofcontrol and management information.

The backbone network and thetechniques for transport. It is IPbackbone.


37/72


38/72

CONTROL LAYER

SOFT SWITCH


39/72

Control Layer

It is responsible of call setup, routing and charging

policies and other controls in NGN environment. It consists of call servers where all information of

the network resides.

These call servers are responsible for setting up,

modifying, charging and tear down of the calls.


40/72

Soft switch

NGN may work on soft switch principle.

It consists of MGC (Media Gateway Controller) as

an overall controller and MGs (Media Gateway)for termination of traffic.

MGC is basically a server and it is having all the

necessary information of network

MGC instructs MGs for establishing the call.


41/72

Soft switch

The MGC also determines the QoS required

for any one connection at the MG .

SIP (Session Initiation Protocol) is used forcommunication between two MGCs and

between a SIP enabled user terminal and

MGC.


42/72

Soft Switch

Performs Call control, signaling and interworking,

Traffic measurement and recording functions

Provides Addressing, Analysis, routing and

charging facilities

Based upon Open Architecture

Should be able to provide all existing services

available in TDM network

Performs Media Gateway Control Function

Interacts with Application Server to supply services

not hosted on Softswitch


43/72

Application Layer

Service Layer/

Management Layer


44/72

Service Layer/ Management Layer

It is responsible for OSS/BSS.

Enhanced services to the subscribers will beprovided with the help of application servers.

It may include prepaid servers, announcementservers, Service servers etc.

Hence NGN is making service separation from

Network. Any service can be introduced with thehelp of server at any time without anymodifications in the control, transport or access


45/72

Application Server

Provides service logic and execution of user

(or customer) services that are not directly

hosted on Softswitch. Due to open architecture and standards it

can be a third party product


46/72

NGN Components

Media Gateway (MG)

Signaling Gateway (SG)

Soft switch or Media Gateway Controller (MGC)

Application/Feature Server

Protocols


47/72

Gateways

1. Interfaces to TDM switches2. Conversion between signalling

(e.g. SS7 to IP signalling)

3. Conversion between media (e.g. E1s to IP)

Signaling GatewayProvides inter working function between

SS7 network and IP networkPerforms Packetisation of signaling andensures its transport through IP network.


48/72

Trunk Media Gateway

TMGW PSTNE1s/STM-1

IP/MPLS

PLMN

MPLS GbE/ 100Base T


49/72

Performs

Voice encoding & Compression

Packetization of voice channels

CNF (Comfort Noise Generation)

VAD (Voice Activity Detection)

Echo Cancellation

May provide the edge functionality

Trunk Media Gateway

AudioCodes


50/72

TP1610

AudioCodes

Media Gateway Offerings

Wireline & Wireless

Up to 480 Ch.

1610

HA System

Wireline & Wireless

18,000 Ch.7,200 Ch.63101610

TP6310

Mediant 8000

Mediant 2000

Large GW

Small and

Very Small GW


51/72

Intels

Signaling Gateway Offerings


52/72

SMON

Media Gateway Offerings

SOFTSWITCH


53/72

SOFTSWITCH

A Softswitch is a device independent software

platform designed to facilitate

telecommunication services in an IP network

Controls the network

Responsible for control and synchronization

of Media Gateways


54/72

Application Server

provides the new services that are the

real value-add for Soft switches

Allows new features to be developed by

third parties.

Softswitch Architecture Interdomain


55/72

Softswitch ArchitectureInterdomain

protocolsApplication

Server

Media

Gateway

SignalingGateway

Media Gateway

Controller

PSTN/

End users

SIP, Parlay, Jain

Sigtran

H.248,MGCP

Application

Server

Media

Gateway

SignalingGateway

Media Gateway

Controller

PSTN/

End users

SIP-T

RTP

Application specific


56/72


57/72


58/72


59/72

MGC MGCSG SG

MGMG PSTNPSTN

SIP

IAM

IAM

INVITE302,CCM

INVITE IAM

IAMACM

ACM180,RINGINGACM

ACMMegaco/

H.248,

MGCP

Megaco/

H.248,

MGCP

ANM

ANM200,O.K.ANM

ANM

ACK

TDM

Audio

RTP

Audio

TDM

Audio

Phone to Phone Call Flow


60/72


61/72


62/72


63/72


64/72


65/72


66/72

QoS Parameters1.Delay (Latency): Time taken to send a packet from

sender to receiver node.

The latency higher than 150 ms noticed and that higher

than 300 ms is unacceptable.

The way to combat latency is to use low-packet intervalcodecs and maintain fast network links.

2. Jitter. It is the variation in latency time from one packet

to the next. It causes packets to arrive out of order.

The solution to this problem is by using a device called

jitter buffers in the SIP phones and MGWs.

3.Packet Loss. Packets discarded during network

congestion causes packet loss.


67/72

Different applications have different QoS requirements


68/72


69/72


70/72


71/72


72/72

1.1.2ngn overview &architecture

Documents