6. Next Generation Networks

A. Transition to NGN

B. Key drivers of NGN development

C. Transport mechanism of the unified network

D. NGN architecture

E. Main NGN building blocks

F. NGN protocols

G. NGN as converged networks: concluding remarks

A. Transition to NGN: First wave• Growth of Internet and other IP-based networks with their requirements for bandwidth and capacity has driven rapidinnovation in telecommunication access and transport networks Examples:– leveraging copper wire “last-mile” networksthrough digital subscriber line (“DSL”) technologies– re-architecturing of cable networks to support IP ‑services– advances in optical networking technologies (e.g.PON)

Convergence of Telephony World and Internet World

Transition to NGN: Second wave

• Ongoing trend towards integration & interoperability of IP-based and PSTN network services and applications• Emergence of differentiated Quality of Service IP-based services• Managed end-to-end performance needed for new applications requiring real-time traffic (e.g., video, voice)• New network management, QoS, traffic engineering, pricing & accounting models

Transition to NGN: Third wave

• Evolution of current PSTN, mobile, wireless and

IP-based networks to unified Next Generation Networks

providing both Internet and carrier-grade telecommunications

networks and services offerings with QoS• Transition to Third wave:

Ubiquitous & Pervasive Networks

– anybody, anytime, anywhere• Global Information Infrastructure (GII) – ITU, 1995• EII ETSI Project (1995)• ITU NGN 2004 Project• Y.1xx ITU-T – SG 13 “NGN – Architecture, Evolution and

Convergence”

One network for everything

TodayToday TomorrowTomorrow

Telephonenetwork

Mobile radionetwork

IP-Network

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

Internet

Transition to NGN: Third wave

ITU-T definition of NGN (Feb 2004)

“A Next Generation Network (NGN) is a packet-based network

able to provide services including Telecommunications 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.”

B. Key drivers of NGN development

Situation TodaySituation Today Target SolutionTarget Solution

VoiceVoice

FRFR

IPIP

ATMATM

......

The Unified Multi Service

Network

The Unified Multi Service

Network

Unified Network: voice migration

VoiceVoice

FRFR

IPIP

ATMATM

......

The Unified Multi Service

Network

The Unified Multi Service

Network

Some what 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

Unified network: data migration

VoiceVoice

FRFR

IPIP

ATMATM

......

The Unified Multiservice

Network

The Unified Multiservice

Network

Pure technology/standardization matter:Transport of different data services

over a unique data backbone

B. Key drivers of NGN development (Cntd.)• Short Term objective:

Create new revenue possibilities– Removal of boundaries between voice and data opens

the way to new kind of services– Can be realized relatively quickly with limited

investments

• Long Term objective: Realize cost savings – Simpler network – More efficient network– Cheaper network components– Full benefit only realized when all separate networks

have fully migrated towards to the target solution

Example NGN Service Drivers

Driven byCost Reduction

Possibilities

Driven byRevenue Increase

Possibilities

C. Transport mechanisms of the unified network

• The unified network will use packet-based technology as the common transport mechanism– Data is the fastest growing segment due to

• Success of Internet• Growing use of E-mail• Growing data traffic between business users

– Data should be handled in the most efficient way– Packet technology is the best way to transport data– Packet technology is only technology that allows simultaneous

delivery of different information streams towards one and the same end-point on one single connection

D. NGN architecture

•Evolution of network architecture – Traditional telephony - Circuit switch based PSTN

D. NGN architecture (Cntd.)

• Evolution of network architecture (Cont.)– Circuit Switched PSTN + Packet Switched IP network (VoIP Gateway)

SG – Signaling gatewayMGC – Media gateway controllerMG – Media gateway

D. NGN architecture (Cntd.)

•Evolution of network architecture (Cont.)– Comletely IP-oriented network

D. NGN Architecture (Cntd.)

Convergence of network technologies and media

Nx64 kbps

Packet NetworkPacket Network

UTRANUTRAN

Mobile Mobile PSTNPSTN

COCOCableCableDSLDSL

BroadbandBroadband

WLLWLLAccess

Edge

Core

Control

Applications

Management

MediaGateway

MediaGatewa

y

System Management Servers

ResidentialUsers

Remote Office/SOHOEnterprise Customers MobileUsers

Softswitches

Signaling gateways

Application Servers

D. NGN architecture (Cntd.)