NGN & the IP Multimedia Subsystem

7/30/2019 NGN & the IP Multimedia Subsystem

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Alireza Navabi

Teacher:

Mr Ali EsmaeiliFit.ac.ir


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A concept for a framework for evolution of networkarchitecture and capabilities, as defined by ITU-TRecommendations

ITU-T SERIES Y: GLOBAL INFORMATIONINFRASTRUCTURE, INTERNET PROTOCOL ASPECTSAND NEXT-GENERATION NETWORKS

Next Generation NetworksFrameworks and

functional architecture models Y.2001 (12/2004) General overview of NGN

Y.2011 (10/2004) General principles and generalreference model for Next Generation Networks

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:a network able to providetelecommunicationservices and able to make use

of multiple broadband, transporttechnologies and in which are from underlying

It enables for users and to competing service providers of their choice. It supports which will allow consistent and ubiquitousprovision of services to users.

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Practical Description from ETSI The of the public switched telephone

network, the (PSTN) voice network,the wireless networks (WiFi / WiMAX / GSM /UMTS)

and the data networks (Internet)and broadcasting networks & services ?... Convergence in the Dictionary

from the Latin verb convergere, i.e. to inclinetogether

convergence is a coming together of two or more

distinct entities or phenomena Convergence in Technology

the combination of two or more differenttechnologies in a single device e.g. taking photoswith a mobile phone, reading emails on arefrigerator, TV on your PC or internet on your TV

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A concept, not just a technology Use packet-based data transfer (IP, ATM) Use multiple broadband, QoS enabled transport

technologies

Independence of service-related functions fromunderlying transport-related functions, implying openinterfaces

Interworking with legacy networks Supports generalised mobility, with presence/location

information Unrestricted access by users to different services and/or

service providers Converged services between Fixed/Mobile networks Meet all Regulatory requirements, e.g. emergency

communications, security/privacy, lawful interceptionetc.

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Benefits: Worked well for stand-alone systems

Challenges:

Many Networks = High Operational and InterworkingCosts

Slow to introduce new services

Users require different devices for different services

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Difficult to integrate new services or technologies

Services

Transport

& Access


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Benefits: Rapid Service Deployment = New Service Revenues Allow continued growth of the network Flexible architecture for future growth and new

technologies Allows for competition at individual layers

Challenges: Legacy policy frameworks are challenged by the emergingtelecommunications model throughout the world

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Services and access technologies only need to interface to the

common transport layer (IP)

Access

Transport

ServicesInternet Protocol


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Each service must beintegrated to a specificaccess technology.

With many servicesconverging it becomescomplex to integratesingle access.

IP provides a commoninterface for accessand services

One point of interfacesimplifies theintroduction of newdevices and services.

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video data voice

dsl wi-fi cable

Internet Protocol

video data voice

dsl wi-fi cable


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Lower cost and

innovative services drivesnetwork convergence

Corporate

Video

PSTN

Services

Wireless

Voice

WWW

IP Core Broadcast

PSTN

Toll Bypass

IP

PSTN

Academic

Corporate

WWW

IP

Broadband

1G-2G

GSM

CDMA

IP

CATV

MPEG

IP


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Europe Ageing networks in need of new equipment

Cost savings, new services North America

Cost savings, new services, competitiveness Operators: IP core conversion, fixed-mobile convergence, new service offerings (VoIP, IP-TV)

Asia Pacific Region Mobile users, less investment in legacy infrastructure, new

services, address space limitations, government NGN initiatives Role-out of new networks in the countries in economic

transition

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Short term issues

Numbering

Regulation of

Standard Telephone

Service

Quality of

Service

Next GenerationLonger term issues

Emergency

Privacy

Security

Competition

Consumerawareness

Jurisdiction

Core policy areas:

Consumer issues

Competition

Security

Scope for self-regulation

Policy implications.


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INNOVATION


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E-mail

SME E-commerce

PSTN,

NGN, 3G

E-banking

E-tax

Office systems

Intranets

E-business,

Managed

networks,

Corporate

networks

SMS

National security

SECURITYWiFi

WiMAX

IP TV,

PVR

INTEROPERABILITY

ACCESSPay TV

spam

Free-to-air &

Satellite b/c


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ACCESS INTEROPERABILITY

Consumer Competition Security

Emergency

Quality of ServiceRights of redressDirectoriesPrivacyInformationChoiceSpecial needsUniversal service

Convergence

BundlingBottlenecksInterconnection &

accessCarrier selectionNumber portabilityMigrationInvestment

STANDARDS

Critical Infrastructure

Viruses & firewallsNetwork attackDisaster recoveryLawful InterceptionCybercrimeMisuse

IDENTITY, NUMBERING, ADDRESSING


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International Telecommunications Union (ITU-T) Study Groups (SG13 lead SG for NGN) Telecommunication Standardization Advisory Group

(TSAG) NGN Global Standards Initiative (NGN-GSI), since Jan 2006

Built on NGN 2004 Project, Focus Group (FGNGN) European Telecommunications Standards Institute

(ETSI) TISPAN, 3GPP / IMS

Internet Engineering Task Force (IETF) Protocols (IP, SIP, MGCP, ENUM, etc)

Global Standards Collaboration (GSC) Asia-Pacific Telecommunity (APT)

ATP Standardisation Program (ASTAP), NGN Expert Group Asia-Pacific Economic Cooperation (APEC)

Telecommunications and Information WorkingGroup APEC TEL

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Smaller industry fora have helped shape internationalstandards. IETF have developed many of the core NGN technologies (IP, MPLS, SIP,

etc.) 3GPP integrated IP-based technologies into an instantiation of the

NGN, IP Multimedia Subsystem (IMS) Release based (ETSI TISPAN r1, 3GPP r7, ITU NGN r1-3)

ITU involvement is necessary at the international level todefine an Evolutionary Framework to help solve interworking,mobility and service definitions issues, but

There could be more pro-active cooperation between thetelco and internet stakeholders

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http://www.ustelecom04.com/conference04/images/atis-logo.jpghttp://www.3gpp2.org/index.cfm


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Transport stratum

Service stratum

MediaHandlingFunctions

Access

Functions

Othernetworks

Othernetworks

CustomerFunctions

TransportUser

ProfileFunctions

Application Functions

GatewayFunctions

Transport ControlFunctions

Control

Media

NNIUNI

Edge

Functions

NetworkAttachment

Control Functions

Core Transport

functions

Core Transport

Functions

Access

Transportfunctions

AccessTransport

Functions

Service and ControlFunctions

ServiceUser

ProfileFunctions

ManagementFu

nctions

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Resource and Admission

Control Functions

RACF

Network Access

Attachment Functions

NAAF

Other Multimedia

Components

Streaming Services

Application Functions

Core transport

FunctionsAccess Transport

Functions

NGN

Terminals

Customer

Networ ks

User

Profile

Functions

OtherNetworks

Legacy

Terminals

GW

PSTN / ISDN Emulation

IP Multimedia

Component

NN ITransport Stratum

Service Stratum

UN I

Edge

Functions

Access

Functions

Service

and

Control

Functions

Customer and

Terminal FunctionsQoS Aspects and one part of Control aspect(IP QoS signaling Requirement) A part of

Release 1 coverage

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Table 2 - List of Release 1 Deliverables

131/11, 3/11, 4/117/13PSTN/ISDN emulation and simulation6

131/11, 3/11, 4/117/13PSTN/ISDN evolution to NGN6

131/11, 3/11, 4/117/13Evolution of Networks to NGN6

134/17, 25/1615/13Security Requirements for R15

115/11Signalling requirements for IP QoS TRQ.IP QoS.SIG.CS14

1317/12, 3/4, 7/44/13, [Note 3]Performance measurement and management for NGN (TR-pmm)3

135/114/13, 3/13Resource and admission control functions(TR-racf)3

134/13A QoS architecture for Ethernet networks (TR-enet)3

1323/164/13Requirements and framework for end-to-end QoS in NGN (TR-e2eqos.1)3

134/13Multi Service Provider NNI for IP QoS (TR-msnniqos)3

134/13A QoS control architecture for Ethernet-based IP access networks (TR-123.qos)3

131/113/13, 7/13PSTN/ISDN emulation architecture2

13,19, [Note 4]1/11, 5/19, 2/19, 3/193/13, 6/13IMS for Next Generation Networks (IFN)2

13,19, [Note 4]1/11, 6/13, 29/166/13, 2/19 [Note 4]Functional Requirements for NGN Mobility (FRMOB)2

131/113/13Requirements & Architecture for NGN (FRA)2

132/13NGN Release 1 requirements1

131/13,2/13NGN Release 1 Scope1

Approving SG

[Note 2]

Associated Question/sCoordinating

Question/SG [Note 1]

Deliverable TitleWG


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NGN Focus Group (FGNGN) scope completeNov05

Work continues in the various ITU-T Study

Groups according to their allocated tasks(Questions)

SG 13 has a continuing (and lead) NGN Role

The ITU-T has announced a NGN Global

Standards Initiative (NGN-GSI) with the Goalto further strengthen the ITU-Ts leading rolein NGN standard work

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Mobile/Fixed Convergence, based on the IMSplatform

A multi-service, multi-protocol, multi-access,IP based network - secure, reliable and trusted

Multi-services: delivered by

a common QoS enabled core network. Multi-access: diverse connectivity networks;

fixed and mobile terminals, (Mobile, xDSL, etc) Not one network, but different networks

that interoperate seamlessly Mobility / Nomadicity of both users and devices My communications services

>>> all of this leads to a true Next GenerationNetwork

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IP Multimedia Subsystem as defined by 3GPP 3GPP IMS standards define a network domain dedicated

to the control and integration of multimedia services.

IMS is defined by 3GPP from Release 5 onwards (2002)

3GPP2 equivalent of IMS is the MMD (MultiMediaDomain), fully interoperable with 3GPP IMS

IMS builds on IETF protocols Based upon SIP, SDP, COPs and Diameter protocols

3GPP have enhanced these IETF protocols for mobility

IMS in short Open-systems architecture that supports a range of IP-

based services over the PS domain, employing bothwireless and fixed access technologies

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What is IMS?


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Services and Control

Adds call session control to the packet network (GPRS) enables peer-to-peer real-time services - such as

voice, video over a packet-switched domain scalable common service control (based on SIP) gives

the ability to manage parallel user services Media Mixing

Ability to pick and mix various multimedia flows insingle or multiple sessions

Can handle real-time voice, video, data Connectivity Network Independence

Provides access to IP based services independent ofthe underlying connectivity technology (mobile / fixed) IMS is based upon an open standard with a strong evolutionary

advantage

IMS architecture & SIP may be easily extended toprovide for new services

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What does IMS provide?


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Visited

Network

UE

Home

Network

ASSLF HSS

GGSN

S-CSCFP-CSCF I-CSCF

Session control

services

Registration

AS interaction

Charging etc.

Access Point toNetwork

Hides Topology& Configuration

First Point ofContact

Privacy Control &QoS

Authorisation

Local Services:Emergency &

Local Numbering

Diameter Protocol

SIP Protocol

IMS basic componentsCSCF Call State Control FunctionsP Proxy

I InterrogatingS ServingUE User EquipmentSLF- Subscriber Location FunctionHSS- Home Subscriber ServerAS Application Server

Gateway GPRSSupport Node


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The IP Multimedia Subsystem generally fulfills theNGN requirements for conversational services For managed, carrier operated telecom. networks With Release 6, IMS becomes applicable to a range of

access network types (3G RAN, WLAN) For the benefit of the whole telecommunications

industry IMS is being proclaimed as the architecture of choice for

converging networks (mobile fixed), as well as voiceand multimedia

It is predicted that IMS will enable IP to graduallyreplace circuit switched voice

Operators who own both fixed and mobile networkswant to consolidate their networks

Growing IMS market, will encouraging greater usageand creation of new IP based services

Open interfaces allow for a wider choice of IMSsuppliers

Market stimulation, decreasing costs (thanks to shareddevelopment/deployment costs)

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Both ITU-T and ETSI are planning a series ofphased Releases of NGN standards. For the ITU-T:-

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A Release is a method of prioritizing by identifyinga set of

services to be addressed in a certaintime frame. The ITU-T NGN-FG should progress the work to definethe service requirements

and capabilities needed to realize the services in addition to

definingother associated capabilities as needed to facilitate a

NGN in a first Release. The adoption of a release-based approachwill not prevent other work, such as the development of more

generic (release independent) capabilities, and the collation of

services, requirements and issues for later releases.


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TISPAN in an ETSI technical committee,dealing with fixed networksand the migration from circuit switched networks

to packet-based networks (Telecoms & Internetconverged Services & Protocols for AdvancedNetworks (TISPAN

TISPAN is responsible for all aspects ofstandardization for present and future converged

networks including NGNTISPAN also deals with service aspects,architectural aspects, protocol aspects, QoS studies,security related studies, mobility aspectswithinfixed networks, using existing and emerging

technologies. 30


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Access

Network Attachment

Subsystem

PST

NAccess Transport

Network Core Transport Network

IMS

IP

(SIP-based)

IP Multimedia Subsystem

(Core IMS)

Resource Control

Subsystem

TISPAN xDSL Connectivity Network

PSTN/ISDN emulation

Subsystem

PSTN/ISDN Emulation tosupport legacy terminals


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Release 1: bringing multimedia services Limited mobility/user-controlled roaming xDSL access focus; Access Network Attachment

Subsystem Release 2 optimizing access resource usage

According to user subscription profile and serviceuse

Corporate users specific requirements Release 3 introducing full (inter-domain) nomadicity

Higher bandwidth access (VDSL, FTTH, Wi-MAX )

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2006

Towards a converged Wireline and Wireless NGN

Release 3

2007 2008

Release 1 Release 2

200920052004

xDSL,WLAN

FTTx FullyNomadic

???

2010


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Described in DTR/TISPAN-00001-NGN-R1 Release-1 completed Dec.2005

Major service capabilities Real time conversational services

(Voice & Videotelephony) Messaging (Instant Messaging, MMS),

Presence Management Legacy services emulation enabling

legacy PSTN/ISDN migration towards NGN

Content delivery such as VOD, VideoStreaming, TV-Channel distribution (IPTV)

Network Architecture basis xDSL access prime focus, also WLAN

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due to the evolution of digital technology (e.g. mediacoding, Internet), home networks have evolvedtowards a complex set of devices supporting servicesand applications in the home-based business,information, entertainment and security/control areas

various standards bodies are developing standards forHome Networking applications in this convergedenvironment

Home Networks have a role in Next GenerationNetworking

standards bodies have resolved to collaborate andpromote the development of harmonized HomeNetworking standards and related networkingstandards.

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xDSLEthernet

Home Shopping

Eth.DTV Tuner

Second LineVoIP

ResidentialGateway

Live Content

Video on Demand

Games Console

Notebook

PDA

Cable

HomeSecurity

Fiber

802.11b/gRouter

Set-top Box
http://www.linksys.com/products/product.asp?grid=34&scid=29&prid=433http://www.alcatel.com/telecom/mbd/products/products/detailed/resi/cordedphones/alcatel2112.htm


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DSL/Cableor MSOTelephone

Wirelesscamera

Wirelessmedia

gateway

NAS forMP3 & Video

Content

Integrated networks, content,and entertainment systems

Managed Security

Managed Voice

Managed Wireless


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NGN is a concept, not just a technology.

NGN is an attempt by operators to provide a singletechnology platform into the future to supportconverged services

NGN is a global initiative, coordinated by the ITU-T

Robust and open standards are essential to thelong term success of IMS and NGN

Not everyone likes or agrees with the NGN conceptespecially large parts of the internet community

Regulators will have an interesting time trying tomanage what is likely to become astandards/systems battle between various players

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ITU-T NGN GSI http://www.itu.int/ITU-T/ngn/index.phtml

ETSI TISPANhttp://portal.etsi.org/portal_common/home.asp?tb

key1=TISPAN IETF http://www.ietf.org/

APT/ASTAPhttp://www.aptsec.org/Program/ASTAP/EG/NGN/i

ndex.htm GSC http://www.gsc.etsi.org/

DCITA - http://www.dcita.gov.au

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http://www.itu.int/ITU-T/ngn/index.phtmlhttp://www.itu.int/ITU-T/ngn/index.phtmlhttp://portal.etsi.org/portal_common/home.asp?tbkey1=TISPANhttp://portal.etsi.org/portal_common/home.asp?tbkey1=TISPANhttp://www.ietf.org/http://www.aptsec.org/Program/ASTAP/EG/NGN/index.htmhttp://www.aptsec.org/Program/ASTAP/EG/NGN/index.htmhttp://www.gsc.etsi.org/http://www.dcita.gov.au/http://www.dcita.gov.au/http://www.gsc.etsi.org/http://www.aptsec.org/Program/ASTAP/EG/NGN/index.htmhttp://www.aptsec.org/Program/ASTAP/EG/NGN/index.htmhttp://www.ietf.org/http://portal.etsi.org/portal_common/home.asp?tbkey1=TISPANhttp://portal.etsi.org/portal_common/home.asp?tbkey1=TISPANhttp://www.itu.int/ITU-T/ngn/index.phtmlhttp://www.itu.int/ITU-T/ngn/index.phtmlhttp://www.itu.int/ITU-T/ngn/index.phtml


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NGN & the IP Multimedia Subsystem