tsc ngn introduction

Telecom Staff College, Haripur

Muhammad Zeeshan


COURSE OBJECTIVES

The Next Generation technologies are rapidly becoming a reality in most progressive parts of the world

No one with a career commitment to technologies affected by these events can afford to ignore the challenging developments that are revolutionizing this industry


COURSE OBJECTIVES

This course is an effort to: Explore a number of major next generation technologies Provide a basic understanding of various

emerging technologies Understand the impact of these technologies in the near future Examines the network evolution from circuit to packet based data networks and include broadband networks, Internet and intelligent networks and how these networks work together to provide user services


NGN - Drivers

Next Generation Networks

Next Generation Networks

Operation Costcompetition

QoS configurability& verification

Meet capacityOn-demand request

Rapid introduction of new technology Voice/Data and wire/wireless integrated managementInteroperability: Multi-vendor equipment

Rapid introduction of new technology Voice/Data and wire/wireless integrated managementInteroperability: Multi-vendor equipment

Demands for new services

Diversity in Technologies

Cope withIP & mobileenvironment


One network for everythingTodayToday TomorrowTomorrow

Telephonenetwork

Mobile radionetwork

IP-Network

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

Internet

Key drivers of NGN development


Unified Network: voice migration

VoiceVoice

FRFR

IPIP

ATMATM

......

The Unified Multi Service

Network

The Unified Multi Service

Network

Somewhat more complex- From circuit switched to packet switched

- Voice switches need to disappear in the long term

A new network concept supporting voice in a packetized environment

is required The Next Generation Network

A new network concept supporting voice in a packetized environment

is required The Next Generation Network


The term “Next Generation Networks” is very broad and almost any development in networking could potentially be placed under this banner

NGN is commonly associated with voice – a vision for the future of packet-based voice networks as part of the evolution from today’s TDM circuit switched voice

Definition: Next Generation Networks


Definition: Next Generation Networks

Convergence: The telephone network (both fixed and mobile) and the Internet are likely to converge into what some people refer to as “Next Generation Networks” or “NGN”

To support NGN, There is ongoing standardization to provide integration and interoperability of IP-based and PSTN network services and applications


According to ETSI, ITU-TA Next Generation Network (NGN) is

A packet-based network able to provide services including Telecommunication Services andAble to make use of multiple broadband, QoS-enabled transport technologiesIt offers unrestricted access by users to different service providersIt supports generalized mobility which will allow consistent and ubiquitous provision of services to users

NGN - STANDARDIZATION


ETSI, ITU-T have agreed on the following characteristics of NGN:Packet-based transferSeparation of control functions among bearer capabilities, call/session, and application/ serviceDecoupling of service provision from network, and provision of open interfacesSupport for a wide range of services, applications and mechanisms based on service building blocksBroadband capabilities with end-to-end QoS and transparencyInterworking with legacy networks via open interfaces Generalized mobility

NGN – STANDARDIZATION (contd.)


A variety of identification schemes which can be resolved to IP addresses for the purposes of routing in IP networksUnified service characteristics for the same service as perceived by the userConverged services between Fixed/MobileIndependence of service-related functions from underlying transport technologiesCompliant with all Regulatory requirements (emergency communications and security/privacy, etc)Unrestricted access by users to different service providers

NGN – STANDARDIZATION (contd.)


The Vision of the next generation Network

ADAVANCED INTERNET PROTOCOLS: VoIP, IPv6, SIP, IP over MPLS over DWDM, Internet2

WLAN

3G

Standards Bodies

Standards Bodies

Standards Bodies


NGN Characteristics

Packet-based transfer

Broadband capabilities with end-to-end QoS and transparency

Interworking with legacy networks via open interfaces generalized mobility

Unrestricted access by users to different service providers


NGN Characteristics (contd.)

Converged services between Fixed/Mobile

Independence of service-related functions from underlying transport technologies

Compliance with national regulatory requirements


Motivation for Next Generation Networks

Increase in data throughput

Network must become faster, more efficient

and much more intelligent

Next Generation technologies will provide solutions


PSTN PSDN

Multi Service Network

Definition of Convergencefor voice services Bringing IP and PSTN/ISDN

network architectures together

Convergence


ConvergencesBusiness, network and platform

BusinessDynamic Market, Technology platform and regulationAccelerating revenue resources

expand marketstrategic alliance

NetworkPrivate & public network convergenceWireless & Wire line network convergence

PlatformPacket and Circuit Switches Convergence

ConvergenceNetwork

Private

Public

Wire

less

Wire L

ine

Packet

Circuit


TDM technology, the basis for today’s voice networks and some of the wide area data networks, does not provide the flexibility and scalability needed for next generation networksTDM voice networks are typically less than 40% utilized.40 % utilization of bandwidth is costing carriers in wasted resources

Convergence (contd.)


Circuit Switching

A circuit is anend-to-end connection

between two subscribers.Capacity is reserved on all trunk lines

and switches along the way.


Time Division Multiplexing (TDM)

Used Used Used Used Used

Frame 1 Frame 2 Frame 3

Slot 1for

Circuit A

Slot 3for

Circuit C

Slot 2for

Circuit B TDM reserves capacityfor each circuit in each frame;assures speed but is wasteful

Time

Slot 1for

Circuit A

Slot 1for

Circuit A


Voice and Data Traffic

Full-Duplex (Two-Way) CircuitVoice Traffic:•Fairly Constant Use of Capacity•Circuit Switching is Fairly Efficient

Full-Duplex (Two-Way) CircuitData Traffic:•Short Bursts•Long Silences;•Circuit Switching is Inefficient for Data Traffic


Moving to packet based voice could raise that instantly up to 65-70%A converged voice and data network could take that up towards the 100% mark

Convergence (contd.)

The ultimate requirement of the next generation network is to handle packetized voice and data in a

converged manner


Packet-based Infrastructure?


Traffic Projected

1999 2000 2001 2002 2003 2004 2005 2006

Best EffortData

ValueData

VoiceTraffic

It’s generally agreed: Data traffic volume surpassed Voice traffic volume Annual growth of Data vs Voice is 100% vs 10%

IP vs POTS


Why NGN ?Cost Efficiency

Factors such as:Lower port costOpen platformReduced space and power requirementsNew revenue streamsImproved competitive positionLower operating costs


Why NGN ?Opened Standard

Circuit Switch Softswitch

Protocols APIsOpen

Protocols APIsOpen

Service, Application, and Features(Management, Provisioning, and Back

Office)

Softswitch Call Control

Transport Hardware

Service &Application

Call Control &Switching

TransportHardware

PROPRIETARY


Media Gateway Faisalabad

Media Gateway

WashingtonIP

IP

IP

Application ServerPeshawar

IP Network

IP

Media Gateway Jeddah

IP

Media Gateway Controller Lahore SS7 Gateway Karachi

Why NGN ?Single Network and Distributed

Architecture


NGN Architecture

Management Plane: gives Operation System Support (OSS) function

Transport Plane: as transport media for all message in the network

Call Control & Signaling Plane: as connection process handler

Service/Application Plane: as supplier and executor of application (telephony, data, multimedia, include Features)


NGN Architecture (contd.)

Service & Application Plane Control &

Signaling PlaneTransport Plane

Management Plane

Non-IP Terminals/Mobile Networks

Non-IP Terminals/Mobile Networks

IP Phones/Terminal

s

IP Phones/Terminal

s

PSTNPSTN

Other Packet Networ

ks

Other Packet Networ

ksInter-

Network Switch

Inter-Network Switch

ININ

Service Provisioning

NetworkManagement

OperationManagement

Billing

ApplicationServer

ApplicationServer

LDAP ServerLDAP Server

SoftswitchSoftswitch

Call AgentCall Agent

MGC / GKMGC / GK

IP TransportDomain

IP TransportDomain

Non-IP AccessDomain

Non-IP AccessDomain

InterworkingDomain

InterworkingDomain


NGN Network Architecture (contd.)

IAD AMGBroadBand

Access

MG

PLMN/3G

SG TMG

PSTN

MG

Management

Packet Core Network

Control & Signaling

Transport

Application

SoftSwitch SoftSwitch

OSS PolicyServer

ApplicationServer

SCPLocationServer

RADIUSServer

MRS


Challenges to Consolidate Network

DSLAMDSLAM

IADIAD

PSTNPSTNNetworkNetwork

RASRAS

CMTSCMTSHFCHFC

DOCSISDOCSIS

MTAMTA

VoIPVoIPGatewayGateway


AdditionalVoice Service Delivery

GatekeeperGatekeeper

RAS running asGateway

Softswitch Implementation in HFC Network

Voice over IP

SoftswitchSoftswitch

Trunk & Access Gateway to PSTN


Trunk GWTrunk GW

Access GWAccess GW

IP BackboneIP Backbone


Converged Network

ATM N/W

Telephone Fax Modem

Public Switch

SS7IP VPN

Internet Hub

ATM Switch

Modem

ServicesFrame RelayATMTDMIP

nx64 Kbps

I-Mux

DSLAM XDSLBuildingX

Inter

net Acc

ess

PC

VoIP

IP N/W

PSTN N/W

Existing Network Complex and Multi Platform


ATM N/W

Telephone Fax Modem

Public Switch

SS7 IP VPNInternet Hub

ATM Switch

Modem

ServicesFrame RelayATMTDMIP

nx64 Kbps

I-Mux

DSLAM XDSLBuildingX

Inter

net Acc

ess

PC

VoIP

IP N/W

PSTN N/W

Converged Network

QoS Backbone (IP)

PSTN

TelephoneCell PhoneLayanan Mobile

IAD

PC

Fax

Application Server

Softswitch

Trunk Gateway

Megaco/H.248MGCP

SIP

SIP

Access Gateway

SS7 Signaling Gateway

SCPINAP, CS-1, CS-2

Wireless Access

Existing NetworkComplex and Multi Platform

Next Generation NetworkIntegrity & Reliability


Converged Network

QoS Backbone (IP)PSTN

Telephone

Cell PhoneLayanan Mobile

IAD

PC

Fax

Application Server

Softswitch

Trunk Gateway

Megaco/H.248MGCP

SIP

SIP

Access Gateway

SS7 Signaling Gateway

SCPINAP, CS-1, CS-2

Wireless Access

Next Generation Network Integrity & Reliability


Next Generation Services


NGN Service Architecture Key Attributes


Next Generation Voice Switching – the “Softswitch”

concept

Soft switches are software-based multi-function network gateways (running under Unix or Windows) that act as interfaces between circuit-switched and packet-switched networks


Key components of softswitch architecture are:

Call agent / Call controller: it performs call control functions

Application Server (AS) provides enhanced features which is not available in Softswitch host.

Operating Support System (OSS) as network management, billing support, etc.

Signaling Gateway (SG) as interface to CCS-7 (STP)

Trunk Gateway (TG) as interface to TE or LE of PSTN

Access Gateway (AG) as interface to CPE

Softswitch System Architecture


Softswitch ProtocolsSIP-T: inter softswitch protocol Media Gateway protocol:

MGCPMegaco (H.248)

Softswitch – VoIP protocol: H.323 (Min. ver 2) Application Server and SIP phone protocol: SIP OSS protocol: SNMP Billing Server protocol: FTP atau TFTP Trunk Gateway has to support CODEC:

G. 711G. 729 G. 723

SS

GK

AS

SS

SIP

SG MG

SIP-T

H.323Megaco,MGCP

SNMP

SIGTRAN

OSS

Billing

FTP/TFTP


Functional Block Diagram

SoftSwitchSoftSwitch SoftSwitchSoftSwitch

3G AccessAMGIADBroadband

Access

PSTNPSTNTMG

SG

PLMNPLMN

IP Core Network

UMG

UMG

Call control path

Talking Path


Soft Switch FunctionsThe signaling gateway is responsible for signaling between end-users on either network.

On the PSTN side, SS7 is used and translated to an IP signaling protocol such as SIP or H.323, and transported across the IP network.

Once a call is setup, the media gateway is responsible for transfer of the data/video/audio streams.

On the PSTN side, media transport is by PCM encoded data on TDM streams.


Soft Switch Functions

For the IP network, different encoding formats (codecs) are used, to transfer data over User data gram protocol (UDP) streams.

The media gateway also handles echo cancellation, security and other end-user features.

The Media Gateway Controller is used to control one or more Media Gateways. Megaco (H.248) and MGCP provide a mechanism for controlling multiple gateways.


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

Voice calls will be made between a mix of conventional handsets and IP enabled devices without the caller or receiver being the slightest bit aware of the manner in which their calls are carried or the nature of the equipment being used


Users are not going to give up existing voice handsets and equipment and so dedicated CPE must exist to adapt the voice calls to the new infrastructure

The creation of the NGN is no overnight transformation – but it is an evolution that is already underway and gathering pace

Conclusion


Users are also not going to give up existing voice features and so these capabilities must be replicated in the packet voice network.

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.

Conclusion

tsc ngn introduction

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