Next Generation NetworksAn Overview

Each service has its own network◦ Multiplied operational costs

Each network managed separately◦ No service interaction

Multiple customer profiles

Today

Private Data

Internet

OSS OSS OSS OSS OSS

Mobile

NB Voice

WAN

Customer

Video

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Level-I TAXs at 21 locations (LDCAs) Level-II TAXs at 301 locations (LDCAs).

Total No. of LDCCs - 322 Tandem / Transit Switches at Big

Cities / SDCC locations (2325 locations)

Total No. of SDCCs 2647 Switches based on the principle of

Circuit Switching

Current Generation Network(CGN)-PSTN

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It has evolved over a period of last 100 years.

It is mainly optimized for “VOICE” 180 Second or 3 minute call and not for data.

It uses “circuit Switching” which is highly reliable.

What is Existing Network?

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Current Generation Network

PDH/SDH/DWDM Transmission Network

Level-I/II TAX, MSC (GSM/CDMA)

Local Exchanges, BSC & BTS

Customers Customers

Level-I/II TAX, MSC (GSM/CDMA)

Local Exchanges, BSC & BTS

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Reliability – 99.999%. This corresponds to 5 minutes down time per year and is known as five-nines reliability

Scalability - Capability Support Lakhs of customers.

Quality of Service :- High speech quality, no perceptible echoes, no noticeable delays, no annoying noises.

Voice Telephony

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Having MSCs, BSCs, BTSs etc◦About 50,000 BTSs (Approx.)◦About 2450 BSCs (Approx.)◦About 900 MSCs ◦Packet core network consisting of SGSN

and GGSN ◦The connectivity with

Mobile- At MSC Level only PSTN- At TAX level / LE Level

MOBILE NETWORK

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Having NIB nodes at circle/SSA/SDCA level

Each node is connected to 2 or more node for backhaul at peer or higher level.

Very difficult to maintain (Very costly) high uptime.

Connectivity at local exchange level

DATA NETWORK

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Fixed line usage is reducing dramatically for “classical” services

Mobile use is increasing steadily even though penetration is already high.

Broadband Internet deployment shows a rapid growth trend.

As per a statistical result IP traffic increases 10 fold every year while voice traffic is relatively flat.

Changing Telecoms Trends

Broadband

Mobile

Fixed

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Slow to develop new features and capabilities.

Expensive upgrades

Proprietary vendor troubles

High OPEX.

Large power and cooling requirements.

Limited migration strategy to New tech.

Product/model obsolescence.

Problems of Existing network

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Operators Want

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Vendors Want

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Customers Want

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BILLS

MOST IMPORTANT

CUSTOMER WANTS

ONE BILL

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In other words CONVERGENCE is the need of the hour.

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This Convergence gives birth to

NGN(NEXT GENERATION NETWORKS)

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Next generation networks

Gateways

Internet

Wireless TelephoneSystem

Workstation

IntegratedServices Over IP

Workstation

Evolving towards IP Communications

Next Generation Networks (NGN)Present Day Networks

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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 any access

One network for any service◦ Unified management structure

Single customer profile

NGN Concept

Today New Service Network

Private Data

Internet Deep Access

Services EdgeMulti-service Aggregation

MPLS Core

OSS OSS OSS OSS OSS OSS

Mobile

NB Voice

WAN

Customer Customer

Migrate

Video

PSTN model Vs NGN model

Voice Network

IPNetwork

VideoNetwork

StorageNetwork

IPNetwork (for Voice, Data & Video)

• Dedicated Network per service

• Large Invest

• Multiple technologies / Knowledge

• Convergence technologies

• Cost reduction

• One Protocol, one Knowledge

Voice Data Video Storage voice Data Video Storage

One network for everything

Today Tomorrow

Telephonenetwork

Mobile radionetwork

IP-Network

Multimedia Access - Advantages:• easy to handle• reliable• mobile

Internet

Transition to NGN:

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NGN – a layered architecture Brings intelligence in every layer

Application Layer

ControlBearer

Service Control Layer Softswitch

ControlIP ServiceSwitching

ApplicationServices

TransportLayer

PSTN

Internet

MultiservicePacket Switching

XX X XX

CORE NETWORKS

XNational Optical

BroadbandAccess

GbEGbE

DSLAMDSLAM

ACCESSNETWORK

RASRAS

Frame/ATM

Frame/ATM

WirelessWireless

CPECPE

Media Gateways

Metro Optical

X

XX

X

04/11/2023 22

One infrastructure is required. One backbone for voice and data services

instead of two parallel ones. No maintenance of proprietary switching

systems. Fewer call controlling entities in the

network so less capital and operating cost. Easier configuration of equipment. Fast advanced and new services

deployment is possible.

Advantages of NGN

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A BIG Change in Mindset

BEFORE AFTER

20,000 Port Switch

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Legacy vs Next Generation

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Floor Space Hardware Software

SoftSwitch

4%

35%

67%

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

Floor Space Hardware Software

SoftSwitch

% of Traditional CAPEX for NGN

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Legacy vs Next Generation

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

MTTR Maintenance Operations Provisioning Training

SoftSwitch

64%

34%

75%67% 70%

0%

10%

20%

30%

40%

50%

60%

70%

80%

90%

100%

MTTR Maintenance Operations Provisioning Training

SoftSwitch

% of Traditional OPEX for NGN

Benefits of the NGN

New revenue opportunities for service providers and operators from IP based services.

Flexibility which supports the development of highly programmable telephony equipment.

Getting to market quickly with new and attractive services (Small gestation period) .

Reduced CAPEX & OPEX for NEW Network Services

Scalable to fit Deployment of Any size.

Benefits of the NGN (Cont..)o Enhanced customer services that it reduces

“time to market”.

o Easy integration of dissimilar networks and

network components.

o Lower cost and Flexibility in development,

deployment & ownership.

o Ready Infrastructure for New Application and

Services.

NGN constraints

New Knowledge acquisition for incumbent.

Integration into existing large Infrastructure.

Multiple components interactions

Market Time evolution.

New Service Opportunities

Voice ServicesHigh-Speed Internet AccessCorporate VPNs“Friends & Family” VPNsVideo and Audio EntertainmentInteractive GamingPersonal Video ConferencingRemote MonitoringOn-Demand Storage Services

Distance LearningHealth CareFinancial ServicesUnified MessagingMobility Services (Cell, PDA, Paging)Derived Voice Lines (VoDSL, VoIP)Security, Disaster RecoveryWi-Fi Integration Services

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In NGN era there is a talk about EOIP which means Everything over IP. That means you can provide any service through NGN platform based on IP.

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The value proposition of NGN

TDM-Technology

NGN IP-Technology

Time

Re

ve

nu

es

pe

r L

ine

Revenue-generating

Applications

Innovative applications throughcommon IP denominator

Internet volumes and technologicaladvancements reduce IP costs

Demand-oriented

Infrastructure

Time

TDM-Technology

NGN IP-Technology

Co

sts

pe

r c

on

ne

cti

on

Reduced number of managed nodes & self-routed IP backbone

Self-managing

Networks

NGN IP-Technology

TDM-Technology

Network size

OP

EX

pe

r li

ne

Applications Of Next Generation Network

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The objective now is …

Verticals broken into horizontals and integrated together in horizontal strata. One common IP based implementation !!!

Single Packet Bearer

Network for all services

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NGN is apacket based network which is able to

provide multimedia telecom services

able to make use of multiple broadband access technologies

QoS enabled transport technologies, and

in which service related functions are independent from underlying transport related technologies.

NGN :Definition (As per ITU)

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 offers unrestricted access by users to different service providers.

It supports generalized mobility which will allow consistent and

ubiquitous provision of services to users.

Definitionof NGN(DraftRec.Y.2001)

Target Standards Area

Generalized Mobility Convergence btw. Fixed & Mobile

Unrestricted Access Open Access Interface

Separation Services with Transport Architecture and Open API

QoS-enabled Transport

Multiple-BroadbandManageable Broadband

Definition & Features of NGN

Next Generation Networks Packet-based network (Generally IP)

Interworking with legacy networks via open interfaces

Unrestricted access by users to ◦ different services and/or

◦ service providers with strict end to end QoS

Independence of service-related functions from underlying transport technologies.

Next Generation Networks (Cont…) Layered architecture with

functional planes separated by open interfaces enabling third party services and applications.

Multi service network

Multiple parallel sessions from same user for various services

Generalized mobility (User/Terminal/Access)

External drivers and internal motivation put pressure on operators’ NGN deployments.

Develop new services easier and faster

Enhance flexibility Reduce operational

expenditures Replace of old platforms at

their end of lifecycle

Massive growth of data traffic

Flat growth of voice market Massive access competition Maturity of IP technology Open standards and

architectures

Deployment of Next Generation Network

Operators’ MotivationDrivers

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TDM versus IP

Subscriber in one BTS talking

to subscriber in another BTS

MSC

MSC

BTS

BTS

TDM NETWORK

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TDM versus IP

SOFTSWITCH

BTS

BTS

Signaling

IP NETWORKVoice Payload

Subscriber in one BTS talking

to subscriber in another BTS

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TDM versus IP

MSC

MSC

BTS

BTS

TDM

Roam

ing

Subscriber in one BTS roams into other subscriber’s BTS

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TDM versus IP

SOFTSWITCH

BTS

BTS

Signaling

IP

Voice Payload

Roam

ing

Subscriber in one BTS roams into other subscriber’s BTS

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NGN Principles : Technology Evolution Towards NGN

-> Separation of layers

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NGN Architecture

Managem

en

t

Control

Service

Media

Access and Transport

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Access Layer: Combines all the access technologies like POTS, ISDN, GSM/UMTS, HFC, LMDS, ADSL etc.

Transport Layer: The backbone network and the techniques for transport. It is IP backbone.

Media Layer: used to adapt the data originating from various technologies to the backbone networks. The equipment is called Media Gateways (MGW)

NGN Architecture

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Control Layer: This layer controls call handling. It comprises of the equipment that manages signaling (SGW) and call handling (Media Gateway Controller).

MGC is also called SOFTSWITCH or Call Server or Call Agent.

Service Layer: This layer comprises of the equipment that centralizes the service logic and data. It is also called as Application Server or Media Server.

Management Layer: It spans over all the other layers and it comprises of all the management equipment.

NGN Architecture

NGN Components

Media Gateway Controller (MGC)

Media Gateway (MG)

Signaling Gateway (SG)

Softswitch

Application/Feature Server

Protocols

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NGN: Soft Switch Architecture

SOFTSWITCH

App. Server

MediaServer

SS7 ISDN

SignalingGateway

MediaGatewayTrunkingGateway

AccessGatewayAccessGateway

IP End Points

HomeGateway

SOFTSWITCH

IP End Points

EnterpriseGatewaySIP

SIP SignalingServer

Management,OSS, BSS,Billing

SIPSIP(T)/SIP(I)SigtranMGCP/H.248AAA, etc.

Core Network

Other Provider’sCore Network

Network Gateway

Wireless Technology Comparison