ngn and ip multimedia
TRANSCRIPT
Next Generation Networks (NGN)&
the IP Multimedia Subsystem (IMS)
Kevin SutherlandManagerCommunications Engineering Section
International Training Program07 September 2006
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What is NGN?...• A concept for a framework for evolution of network
architecture and capabilities, as defined by ITU-T Recommendations
• ITU-T SERIES Y: GLOBAL INFORMATION INFRASTRUCTURE, INTERNET PROTOCOL ASPECTS AND NEXT-GENERATION NETWORKS
Next Generation Networks – Frameworks and functional architecture models
• Y.2001 (12/2004) General overview of NGN• Y.2011 (10/2004) General principles and general reference
model for Next Generation Networks
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NGN Definition from Y.2001
Next Generation Network (NGN): 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 enables unfettered access for users to networks and to competing service providers and/or services of their choice. It supports generalized mobility which will allow consistent and ubiquitous provision of services to users.
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NGN Definition cntd…
• Practical Description …from ETSI– The convergence 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 ‘incline’ together – convergence is a coming together of two or more distinct
entities or phenomena • Convergence in Technology
– the combination of two or more different technologies in a single device – e.g. taking photos with a mobile phone, reading emails on a refrigerator, TV on your PC or internet on your TV…
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Convergence… new multimedia devices
Source:http://www.telstra.com.au/abouttelstra/investor/docs/tls366_stratrevjustinmilne.pdf
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NGN key characteristics• 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 from underlying
transport-related functions, implying open interfaces• 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 interception etc.
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Existing Telecommunications
• Benefits:– Worked well for stand-alone systems
• Challenges: – Many Networks = High Operational and Interworking Costs
– Slow to introduce new services
– Users require different devices for different services
Difficult to integrate new services or technologies
Services
Transport & Access
Source: ASTAP05/WS-IP&NGN/13
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Emerging Telecommunications
Services and access technologies only need to interface to the common transport layer (IP)
Access
Transport
ServicesInternet Protocol
• 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 emerging
telecommunications model throughout the world
Source: ASTAP05/WS-IP&NGN/13
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Access and Service Independence
• Each service must be integrated to a specific access technology.
• With many services converging it becomes complex to integrate single access.
• IP provides a common interface for access and services
• One point of interface simplifies the introduction of new devices and services.
video data voice
dsl wi-fi cable
Internet Protocol
video data voice
dsl wi-fi cable
Source: ASTAP05/WS-IP&NGN/13
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Networks in TransitionLower cost and
innovative services drives network 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
Source: ASTAP05/WS-IP&NGN/13
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Core IP/MPLS Networks
User
One schematic view of NGN…
DSL
ASPNetwork
WEB
ASPNetwork
VoD
DOCSIS
IMS
MMS
GSMWi-Fi
Access
Transport
ServicesSIP
PSTN
PSAPNetwork
E911
Source: ASTAP05/WS-IP&NGN/13
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Driving forces for NGNs
• 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
Source: ASTAP05-FR10-PL-30
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Short term issues
NumberingNumbering
Regulation of “Standard Telephone
Service”
Regulation of “Standard Telephone
Service”
Quality of ServiceQuality of
Service
“Next Generation”Longer term issues
EmergencyEmergency
PrivacyPrivacy
SecuritySecurity
CompetitionCompetition
Consumer awarenessConsumer awareness
JurisdictionJurisdiction
Core policy areas:• Consumer issues• Competition• SecurityScope for self-regulation
Policy implications….Source: ASTAP05_WS.IP&NGN-09
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INTEROPERABILITY?
INTEROPERABILITY?
SECURITY? INNOVATION
ACCESS?
Source: ASTAP05_WS.IP&NGN-09
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Access, security & interoperability
SME E-commerce
PSTN, NGN, 3GE-bankingE-tax
Office systems
Intranets
E-business, Managed networks, Corporate networks
SMS
National security
SECURITYWiFiWiMAX
IP TV, PVR
INTEROPERABILITY
ACCESSPay TV
spam
Free-to-air &Satellite b/c
Source: ASTAP05_WS.IP&NGN-09
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ACCESS INTEROPERABILITY
ConsumerConsumer CompetitionCompetition SecuritySecurity
EmergencyQuality of ServiceRights of redressDirectoriesPrivacyInformationChoiceSpecial needsUniversal service
ConvergenceBundlingBottlenecksInterconnection & accessCarrier selectionNumber portabilityMigrationInvestment
STANDARDS
Critical InfrastructureViruses & firewallsNetwork attackDisaster recoveryLawful InterceptionCybercrimeMisuse
IDENTITY, NUMBERING, ADDRESSING
Source: ASTAP05_WS.IP&NGN-09
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Areas of interest for NGN standards activity• 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 Working Group APEC TEL
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Defining Standards
• Smaller industry fora have helped shape international standards.– 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 to define an Evolutionary Framework to help solve interworking, mobility and service definitions issues, but…
• There could be more pro-active cooperation between the ‘telco’ and internet stakeholders…
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ITU-T Structural model of Functional components
Transport stratum
Service stratum
MediaHandlingFunctions
AccessFunctions
Othernetworks
Othernetworks
CustomerFunctions
TransportUser
Profile Functions
Application Functions
GatewayFunctions
Transport Control Functions
Control
Media
NNIUNI
EdgeFunctions
Network Attachment
Control Functions
Core Transportfunctions
Core TransportFunctions
AccessTransportfunctions
AccessTransportFunctions
Service and ControlFunctions
ServiceUser
Profile Functions
Man
agem
ent F
unct
ions
Ref: http://ties.itu.int/u/fgngn/fgngn/readonly/200504_Geneva/focus_group_reports/FGNGN-MR-0040r1.doc
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Current coverage of FGNGN Release 1
Resource and Admission Control Functions
RACF
Network AccessAttachment Functions
NAAF
Other Multimedia Components …
Streaming Services
Application Functions
Core transport Functions
Access Transport Functions
NGN Terminals
CustomerNetworks
UserProfile
Functions
Oth
er N
etw
ork
s
LegacyTerminals
GW
PSTN / ISDN Emulation
IP Multimedia Component
NNITransport Stratum
Service Stratum
UNI
Edge Functions
Access Functions
Service and
Control Functions
Customer and Terminal Functions
QoSAspects and one part of Control aspect(IP QoSsignaling Requirement) A part of
Release 1 coverage
Ref: http://ties.itu.int/u/fgngn/fgngn/readonly/200504_Geneva/focus_group_reports/FGNGN-MR-0040r1.doc
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ITU-T releases
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Continuing ITU-T Work• NGN Focus Group (FGNGN) scope complete Nov05• 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 Goal “to further strengthen the ITU-T’s leading role in NGN standard work”
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The ETSI NGN Vision• Mobile/Fixed Convergence, based on the “IMS” platform • 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”
– anywhere, any terminal, anytime
>>> all of this leads to a true Next Generation NetworkSource: ASTAP05-WP.IP&NGN-08_ETSI
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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 (MultiMedia Domain), 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 both wireless and fixed access technologies
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 in single or multiple
sessions
– Can handle real-time voice, video, data• Connectivity Network Independence
– Provides access to IP based services independent of the underlying connectivity technology (mobile / fixed)
• IMS is based upon an open standard with a strong evolutionary advantage
– IMS architecture & SIP may be easily extended to provide for new services
What does IMS provide?
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VisitedNetwork
UE
HomeNetwork
ASSLFHSS
GGSN
S-CSCFP-CSCF I-CSCF
Session control services
Registration
AS interaction
Charging etc.
Access Point to Network
Hides Topology & Configuration
First Point of Contact
Privacy Control & QoS
Authorisation
Local Services: Emergency &
Local Numbering
Diameter ProtocolSIP Protocol
IMS basic componentsCSCF – Call State Control FunctionsP – ProxyI – InterrogatingS – ServingUE – User EquipmentSLF- Subscriber Location FunctionHSS- Home Subscriber ServerAS – Application Server
Gateway GPRS Support Node
Source: ASTAP05-WP.IP&NGN-08_ETSI
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IMS Architecture
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Why IMS in NGN? - ETSI’s view
• The IP Multimedia Subsystem generally fulfills the NGN 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 voice and multimedia
– It is predicted that IMS will enable IP to gradually replace circuit switched voice
– Operators who own both fixed and mobile networks want to consolidate their networks
– Growing IMS market, will encouraging greater usage and creation of new IP based services
– Open interfaces allow for a wider choice of IMS suppliers– Market stimulation, decreasing costs (thanks to shared
development/deployment costs)Source: ASTAP05-WP.IP&NGN-08_ETSI
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NGN Releases
• Both ITU-T and ETSI are planning a series of phased “Releases” of NGN standards. For the ITU-T: -
A Release is a method of prioritizing by identifying a set of services to be addressed in a certain time frame. The ITU-T NGN-
FG should progress the work to define the service requirements and capabilities needed to realize the services in addition to
defining other associated capabilities as needed to facilitate a NGN in a first Release. The adoption of a release-based approach
will 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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ETSI - TISPAN• TISPAN in an ETSI technical committee,
dealing with fixed networksand the migration from circuit switched networksto packet-based networks (Telecoms & Internet converged Services & Protocols for Advanced Networks (TISPAN)
• TISPAN is responsible for all aspects of standardization for present and future converged networks including NGN
• TISPAN also deals with service aspects,architectural aspects, protocol aspects, QoS studies, security related studies, mobility aspects within fixed networks, using existing and emerging technologies.
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TISPAN NGN Architecture
AccessNetwork AttachmentSubsystem
PSTN
Access TransportNetwork Core Transport Network
IMS
IP
(SIP -based)IP Multimedia Subsystem
(Core IMS )
Resource ControlSubsystem
TISPAN xDSL Connectivity Network
PSTN/ISDN emulationSubsystem
PSTN/ISDN Emulation to support legacy terminals
Source: ASTAP05-WP.IP&NGN-08_ETSI
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ETSI TISPAN NGN Roadmap
2006
Towards a converged Wireline and Wireless NGN …
Release 3
2007 2008
Release 1 Release 2
200920052004
xDSL,WLAN FTTx Fully
Nomadic
• 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 service use– Corporate users specific requirements …
• Release 3 introducing full (inter-domain) nomadicity– Higher bandwidth access (VDSL, FTTH, Wi-MAX …)
???
2010
Source: ASTAP05-WP.IP&NGN-08_ETSI
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TISPAN NGN Rel-1 Scope
• 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, Video
Streaming, TV-Channel distribution (IPTV)
• Network Architecture basis– xDSL access prime focus, also WLAN
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‘Home Networking’ standards development
• due to the evolution of digital technology (e.g. media coding, Internet), home networks have evolved towards a complex set of devices supporting services and applications in the home-based business, information, entertainment and security/control areas
• various standards bodies are developing standards for Home Networking applications in this converged environment
• Home Networks have a role in Next Generation Networking • standards bodies have resolved to collaborate and promote
the development of harmonized Home Networking standards and related networking standards.
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NGN Consumer Access – Multiple Broadband Access
Options
xDSLEthernet
Home Shopping
Eth.DTV Tuner
Second Line VoIP
Residential Gateway
Live Content
Video on Demand
Games Console
NotebookNotebook
PDAPDAB
road
ban
d A
cces
s
Cable
HomeSecurity
Fiber
802.11b/gRouter
Set-top BoxE
ther
ne
t
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The Future Home…
DSL/Cable or MSOTelephone
Wireless camera
Wireless media
gateway
NAS for MP3 & Video
Content
Integrated networks, content,and entertainment systems
Managed Security
Managed Voice
Managed Wireless
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In closing…• NGN is a concept, not just a technology.• NGN is an attempt by operators to provide a single technology
platform into the future to support converged services• NGN is a global initiative, coordinated by the ITU-T • Robust and open standards are essential to the long term
success of IMS and NGN • Not everyone likes or agrees with the NGN concept –
especially large parts of the ‘internet community’• Regulators will have an interesting time trying to manage what
is likely to become a standards/systems battle between various players
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Links
• ITU-T NGN GSI http://www.itu.int/ITU-T/ngn/index.phtml• ETSI TISPAN
http://portal.etsi.org/portal_common/home.asp?tbkey1=TISPAN
• IETF http://www.ietf.org/• APT/ASTAP
http://www.aptsec.org/Program/ASTAP/EG/NGN/index.htm• GSC http://www.gsc.etsi.org/• DCITA - http://www.dcita.gov.au
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Thank you for your attention
• Questions ?...