I nternational Telecom m unication Union ITU-T NGN: Basic Architecture NGN: Basic Architecture & & Interesting Issues Interesting Issues Keith Knightson Consultant Industry Canada I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6
Outline ITU-T o S et scene for subsequent sessions by: • Introducing basic concepts • S howing high-level viewpoints • List architectural challenges • S ummarize architectural work to date • S how areas for further study I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 2
NGN Definition ITU-T 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. From ITU-T Recommendation Y.2001 I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 3
Y.2 0 1 1 : NGN General Reference Model ITU-T Data Video Services Services Telephony (WWW, Pre-NGN: (TV, Services e-mail, movie, etc) etc) Vertically Data Integrated Video Services PSTN Services Network Networks Network NGN: NGN Services Horizontally ITU-T Rec. Stratum Y.2011 Integrated Networks NGN Transport Stratum I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 4
Single Convergence Layer ITU-T Any Service Services Stratum & Every Service Scope Internet Protocol Of (IP) “NGN” Transport Stratum Any Transport & Every Transport Technology Two Service Domains I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 5
Service Provision: Mediated and non-m ediated services ITU-T Service Application Application Interconnection & & Mediated Service Service Mediated Servers Servers Services Services S S Single/Distributed Non-Mediated Services (Switched) Switched (Switched) Packet Core T Packet T Access Packet Access Network(s) Network(s) Network(s) End End User User System System Transport Transport Network Network Interconnection Interconnection I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 6
Effects of Separation: the good, the bad and the challenge ITU-T Good: o • Any service over a single IP transport network Bad: o • Two different levels of control, authentication, admission, charging, etc. Challenge: o • S ervice to transport coupling & mapping for: —QoS selection —QoS control —transport resource allocation — monitoring —accounting for usage Solution: Resource & Admission Control Functions (Session 3) I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 7
Basic Functional Third Party Applications View ANI ITU-T Application/Service Support Functions Service User Management Functions Profiles Service Control Functions Service stratum Transport User Network Resource and Profiles Attachment Admission Control Control Functions Functions Transport Control Functions End-User Other Functions Networks Transport Functions UNI NNI Transport stratum Control Media I TU-T W orkshop “NGN and its Transport Netw orks“ Management Kobe, 2 0 -2 1 April 2 0 0 6 8
Com ponent View Third Party Applications ITU-T Service Stratum Application/Service Support Functions Application Functions Service S. User Other Multimedia Service Control Profile Components … Functions Functions Streaming Service Component PSTN / ISDN Emulation Service Component Other Networks Other Networks IP Multimedia Component IP Multimedia &PSTN/ISDN Simulation Service Component GW GW Legacy Terminals Network Attachment Resource and Admission Network Access T. User User Control Functions Control Functions Attachment Functions GW GW Profile Profile (NACF) (RACF) NAAF Legacy Functions Functions Terminals Customer Access Network Core Transport Core transport Access Transport Networks Functions Functions Functions Functions Edge Functions NGN Terminals Transport Stratum Transport Stratum End-User I TU-T W orkshop “NGN and its Transport Netw orks“ Functions Kobe, 2 0 -2 1 April 2 0 0 6 9
Other Architectural Challenges ITU-T o Mobility • Fixed to mobile convergence (FMC) o Application-driven QoS : • Classes and their designations • Explicit bandwidth selection • S ervice to transport mapping & control • Flow awareness I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 0
Architectural Evolution ITU-T QoS in Access: o • Multiple terminals, multiple QoS • Role of Home Gateway (shaping, limiting) • Home gateway management control Distributed network control of/ for QoS path: o • Horizontal means • Vertical means • Monitoring, dynamic allocations, accounting Network Control and Management o • Protect from attack • S eparation from payload paths I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 1
Fixed to Mobile convergence ITU-T Base Radio Access Station Network Controller UMA-enabled GSM/IMS Core Dual Mode …. Service …. …. Handset …. Architecture GANC Tunnelled (UMA) IMS stack Network WiFi Controller IP Access RG Network IP Core VoIP Native IP Transport SIP …. …. Stack …. …. Server SIP Fixed/wireless Telephone I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 2
Hom e Gatew ay Architecture/ Functionality ITU-T Desktop Desktop PC PC Home Network Customer 10/100 Terminating Routing Premise Set Top Box Unit Base-T Gateway Network Television Other Devices, Set Top Box Appliances, etc Television IP …. …. …. phone …. QoS per device/terminal I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 3
Sum m ary of key architectural w ork in SG1 3 ( 1 ) ITU-T o Y.2001: NGN Overview • NGN Definition, Characteristics & Subject Areas o Y.2011: General Reference Model • High-level paradigms • Separation of concerns, services from networks • Architectural principles • OSI model relevance • G.805 relevance o Y.FRA: Functional Requirements & Architecture • Generic service control functions • Generic transport control functions I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 4
Sum m ary of key architectural w ork in SG1 3 ( 2 ) ITU-T o Y.IFN: IMS for NGN • IMS functions • Positioning with respect to Y.FRA o Y.PIEA: PSTN/ISDN Emulation Architecture • Call Server based emulation • IMS based emulation o Y.CSF: Converged Services Framework • Service coordination across heterogenous systems and technologies • Overlay architecture across diverse systems I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 5
Areas for further study ITU-T o Streaming Services • IPTV o Identity based systems • RFID o Home Networks • Home Gateways • Gateway management I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 6
The End ITU-T I TU-T W orkshop “NGN and its Transport Netw orks“ Kobe, 2 0 -2 1 April 2 0 0 6 1 7
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