Download - 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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