Migration Towards Converged Networks
Dr. Ghassem Koleyni
FORUM ON NEXT GENERATION STANDARDIZATION
(Colombo, Sri Lanka, 7-10 April 2009)
Colombo, Sri Lanka, 7-10 April 2009
Content
Telecommunications network Network evolution Needs and expectations What is NGN? PSTN & ISDN evolution to NGN Standardization activities Conclusion
Colmbo, Sri Lanka, 7-10 April 2009
2
Telecommunications Network
Colmbo, Sri Lanka, 7-10 April 2009
3
Core NetworkCore Network
HomeHome NetworkNetwork
AccessAccessNetwoNetwo
rkrk
Access Access NetwoNetwo
rkrk
HomeHome NetworkNetwork
Network Evolution IP: Mid to late 1970’s (No QoS guaranteed) Ethernet: 1973-1975 at Xerox ISDN: Mid to late 1980’s (QoS guaranteed while
increasing the bandwidth, many new services ) X.25: Mid to late 1980’s (transmission of data
without loss nor duplication) FR: Mid to late 1980’s (QoS guaranteed while
increasing the bandwidth) ATM: Early 1990’s (guaranteed QoS, increased
bandwidth, combined switching and transport capability with high level of performance and scalability)
Colmbo, Sri Lanka, 7-10 April 2009
4
Vertically-Integrated Networks
Colmbo, Sri Lanka, 7-10 April 2009
5
VoiceService
s
VoiceServic
esNetwo
rk
DataService
s
DataServic
esNetwo
rk
VideoService
s
VideoServic
esNetwo
rk
Expectations (I)
Reduced expenses
Fewer core switches and transit exchanges Reduced CAPEX & OPEX
Faster return on investmentIncreased network efficiency and utilisation
Reduced deployment time
Fast and open service creation platformOne-stop shop for billing
A set of management functions shared between different services
Open services architectureColmbo, Sri Lanka, 7-10 April 2009
6
Expectations (II)
Interoperable networksStandardized interfaces and protocols
Faster service deployment Multimedia services support
Guaranteed QoS and QoS differentiation Access agnostic (copper, cable, fibre, wireless) Service continuity between fixed and mobile
Terminal portability
Increased bandwidth availability Secure, reliable and simple (Secure, reliable and simple (ease of use) Affordable
Colmbo, Sri Lanka, 7-10 April 2009
7
The Evolution Trend
Colmbo, Sri Lanka, 7-10 April 2009
8
Switching
Services
Transmission
Interfaces
Circuit- switched
Telephone services
TDM based
Proprietary
Packet- switched
Multimedia services
SDH, PDH, etc.
StandardizStandardizeded
Colmbo, Sri Lanka, 7-10 April 2009
9
NGN standardization in ITU-T
Chronology of NGN Standardization in ITU-T
First workshop on NGN in ITU-T convened in Geneva, 9-10 July 2003
Meeting convened with cooperation from SGs 11, 13, 16 and SSG (predecessor to SG 19)Presentations from different interest groupsSG 13 was tasked to lead study group on NGN
First JRG-NGN meeting, 29 September to 2 October 2003
Four draft Recommendations were generated NGN Focus Group was formed in May 2004 Study Group 13 (NGN SG) established by
WTSA-04 as the lead SG for NGN studies NGN-GSI started in 2006 and is continuing
Colmbo, Sri Lanka, 7-10 April 2009
10
Next Generation Network (NGN)
Colmbo, Sri Lanka, 7-10 April 2009
11
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.Source: ITU-T RecommendationY.2001
Different aspects of NGN (I)
Packet-based transfer Separation of control functions among
bearer capabilities, call/session, and application/service
Decoupling of service provision from transport, and provision of open interfaces
Support for a wide range of services, applications and mechanisms based on service building blocks (including real time/streaming/non-real time services and multi-media)
Colmbo, Sri Lanka, 7-10 April 2009
12
Different aspects of NGN (II)
Broadband capabilities with end-to-end QoS and transparency
Interworking with legacy networks via open interfaces
Generalised mobility Unfettered access by users to different
service providers A variety of identification schemes which
can be resolved to IP addresses for the purposes of routing in IP networks
Colmbo, Sri Lanka, 7-10 April 2009
13
Different aspects of NGN (III)
Unified service characteristics for the same service as perceived by the user
Converged services between Fixed and Mobile networks
Independence of service-related functions from underlying transport technologies
Support of multiple last mile technologies Compliant with all Regulatory
requirements, for example concerning emergency communications and security/privacy
Colmbo, Sri Lanka, 7-10 April 2009
14
In Brief
Colmbo, Sri Lanka, 7-10 April 2009
15
• Simplicity• Increased productivity• Increase customer satisfaction• Increased revenue
NGN, a single network providing services agnostic to the underlying transmission technologies and through different access networks
Horizontally Integrated Network
Colmbo, Sri Lanka, 7-10 April 2009
16
NGN Services Stratum
User plane
ControlManagement plane
NGN Transport Stratum
User plane
ControlManagement plane
NGN Basic Reference Model (NGN BRM)
Separation of Services from Transport in NGN
Colmbo, Sri Lanka, 7-10 April 2009
17
NGN transport
NGN services
e.g., voice telephony services (audio, fax, etc.)
e.g., Data services (WWW, e-mail, etc.)
e.g., Video services (TV, movie, etc.)
CO-CS, CO-PS and CLPS layer technologies
General NGN Functional Model
Colmbo, Sri Lanka, 7-10 April 2009
18
Resources
Services
Service control functions
Service management functions
Infrastructural, application, middleware and baseware
services
NGN Service
NGN
Transport
Transfer functional area
Resources
Transport management functions
Transport control functions
Colmbo, Sri Lanka, 7-10 April 2009
19
19
OtherNetworks
Service ControlFunctions
Transport stratum
Service stratum
ControlMedia
Man
ag
em
en
t Fu
ncti
on
s
Management
Service UserProfiles
Transport User
Profiles
ANI
End-UserFunctions
Transport Control Functions
Resource and Admission Control
Functions
Network Attachment
Control Functions
Transport Functions
NNIUNI
Application Support Functions & Service Support Functions
Applications
Re-distribution of Service Intelligence
Colmbo, Sri Lanka, 7-10 April 2009
20
Migration ofService Intelligence
UserAccessUser Access
Colmbo, Sri Lanka, 7-10 April 2009
21
PSTN & ISDN Evolution to NGN
What to consider when evolving PSTN/ISDN to NGN
Colmbo, Sri Lanka, 7-10 April 2009
22
Transport Signalling and control Management Services
Bearer servicesSupplementary services
Operation, administration and maintenance (OAM) Naming, numbering and addressing Accounting, charging and billing Inter-working National regulations Emergency telecommunications Security aspects
Different Approaches
Call server (CS)-basedEquipment re-useService continuity
IP multimedia sub-system (IMS)-based
Immediate migrationAccess to new services
Colmbo, Sri Lanka, 7-10 April 2009
23
NGN: CS-based
Colmbo, Sri Lanka, 7-10 April 2009
24
PSTN
Packet SwitchedNetwork
signalling
AN
PABX
Call Server
Private Lines
Wireless
ISDN
Cable, IAD, xDSL
Example of PSTN/ISDN Evolution
Colmbo, Sri Lanka, 7-10 April 2009
25
NGN: IMS-based
Colmbo, Sri Lanka, 7-10 April 2009
26
Packet Switched Network
Other networks
IMS
Other networks
signalling
PSTN/ISDN Emulation & Simulation
Colmbo, Sri Lanka, 7-10 April 2009
27
PSTN/ISDN emulation Provides PSTN/ISDN service capabilities and interfaces using adaptation to an IP infrastructure.
PSTN/ISDN simulationProvides PSTN/ISDN-like service capabilities using session control over IP interfaces and infrastructure.
Colmbo, Sri Lanka, 7-10 April 2009
28
Emulation, Simulation, Interoperability and Interworking with NGN
NGN(Carrier X)
NGN(Carrier Y) PLMN
PSTN/ISDN Public IP NETWORK
User Equipment
SIMULATION
EMULATION
NNI
UNI
NNI
UNI
UNI
UNI
User Equipment
User Equipment
Evolution Strategy
Colmbo, Sri Lanka, 7-10 April 2009
29
Transition costBusiness model
Customer expectationAre customers ready for changes?If higher expenses are involved, are customerst ready to pay?
Choice of technology Products and services to be offered Domestic regulations
NGN Recommendations, Y Series
Colmbo, Sri Lanka, 7-10 April 2009
30
Frameworks and functional architecture models
Y.2000–Y.2099
Quality of Service and performance Y.2100–Y.2199
Service aspects: Service capabilities and service architecture
Y.2200–Y.2249
Service aspects: Interoperability of services and networks in NGN
Y.2250–Y.2299
Numbering, naming and addressing Y.2300–Y.2399
Network management Y.2400–Y.2499
Network control architectures and protocols Y.2500–Y.2599
Security Y.2700–Y.2799
Generalized mobility Y.2800–Y.2899
NGN Recommendations, Q Series
Colmbo, Sri Lanka, 7-10 April 2009
31
General Q.3000–Q.3029
Network signalling and control functional architecture
Q.3030–Q.3099
Network data organization within the NGN Q.3100–Q.3129
Bearer control signalling Q.3130–Q.3179
Signalling and control requirements and protocols to support attachment in NGN environments
Q.3200–Q.3249
Resource control protocols Q.3300–Q.3369
Service and session control protocols Q.3400–Q.3499
Service and session control protocols – supplementary services
Q.3600–Q.3649
NGN applications Q.3700–Q.3849
Testing for NGN networks Q.3900–Q.3999
Conclusion
Colmbo, Sri Lanka, 7-10 April 2009
32
Substantial progress has been made in the preparation of specifications addressing evolution of networks to NGN
Good progress on signalling and protocol work
More work needs to be done, specifically on the OAM, management and control & signalling aspects
Compliance to global standards would reduce procurement costs and promote inter-operability
Compliance to global standards would reduce procurement costs and promote inter-operability
List of Acronyms )
Colmbo, Sri Lanka, 7-10 April 2009
33
ADF Adaptation FunctionAG Access GatewayAN Access NetworkANI Application Network
InterfaceATM Asynchronous Transfer
ModeCAPEX CAPital EXpenditure CO-CS connection-oriented circuit-
switched CO-PS connection-oriented
packet- switched CLPS connectionless packet-
switched CS Call ServerDSL Digital Subscriber LineDTE Data Terminal EquipmentFR Frame Relay IAD Integrated Access DeviceIMS IP Multimedia Sub-system IP Internet ProtocolISDN Integrated Services Digital
NetworkIWF Inter-working FunctionLE Local ExchangeNGN Next Generation NetworkNNI Network Network Interface
OAM Operation, Administration, Maintenance
OPEX OPerating EXpenditurePABX Private Automatic Branch
eXchangePBX Private Branch eXchangePDH Plesiochronous Digital
HierarchyPLMN Public Land Mobile NetworkPSPDN Packet Switched Public Data
NetworkPSTN Public Switched Telephone
NetworkQoS Quality of ServiceREV Reverse ChargingSDH Synchronous Digital
HierarchySG Signalling GatewaySIP Session Initiation ProtocolTDM Time Division MultiplexingTE Transit ExchangeTMG Trunking Media GatewayTV TelevisionUAM User Access ModuleUNI User-Network InterfaceWWW World Wide Web
Thank you for your attention
Colmbo, Sri Lanka, 7-10 April 2009
34
Dr. Ghassem KoleyniEmail: [email protected] Tel: +1 613 592 5344
Colmbo, Sri Lanka, 7-10 April 2009
35
Back up slides
ITU-T NGN Related Recommendations (Q Series)
Colmbo, Sri Lanka, 7-10 April 2009
36
Q.3030 Signalling architecture for the NGN service control plane
Q.3150 Use of virtual trunks for ATM/MPLS client/server control plane interworking
Q.3151 ATM and frame relay/MPLS control plane interworking: Client-server
Q.3201 EAP-based security signalling protocol architecture for network attachments
Q.3201.1Authentication protocols based on EAP-AKA for interworking
among 3GPP, WiMax, and WLAN in NGN
Q.3300 Architectural framework for the Q.33xx series of Recommendations
Q.3301.1 Resource control protocol - Protocol at the Rs interface
Q.3302.1 Resource control protocol - Protocol at the Rp interface
ITU-T NGN Related Recommendations (Q Series)
Colmbo, Sri Lanka, 7-10 April 2009
37
Q.3303.0 Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE) (Rw interface): Overview
Q.3303.1 Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE): COPS Alternative
Q.3303.2 Protocol at the interface between a Policy Decision Physical Entity (PD-PE) and a Policy Enforcement Physical Entity (PE-PE) (Rw interface): H.248 Alternative
Q.3303.3 Protocol at the interface between the policy decision physical entity (PD-PE) and the policy enforcement physical entity (PE-PE) (Rw interface): Diameter
Q.3304.1Resource control protocol no. 4 (rcp4). Protocol at the interface between a transport resource control physical entity (TRC-PE) and a transport physical entity (T-PE) (Rc interface): COPS alternative
ITU-T NGN Related Recommendations (Q Series)
Colmbo, Sri Lanka, 7-10 April 2009
38
Q.3304.2 Resource control protocol no. 4 SNMP Profile. Protocol at the Rc interface between a transport resource control physical entity (TRC-PE) and a transport physical entity (T-PE) (Rc interface)
Q.3305.1 Resource control protocol - Protocol at the Rt interface
Q.3401 NGN NNI signalling profile
Q.3402 NGN UNI signalling profile (Protocol set 1)
Q.3900 Methods of testing and model network architecture for NGN technical means testing as applied to public telecommunication networks
Q.3901 Distribution of tests and services for NGN technical means testing in the model and operator networks
Q.3902 Parameters to be monitored in the process of operation when implementing NGN technical means in public telecommunication networks
ITU-T NGN Related Recommendations (Y Series)
Colmbo, Sri Lanka, 7-10 April 2009
39
Y.2001 General overview of NGN Y.2011 General principles and general reference model for Next
Generation Networks Y.2012 Functional requirements and architecture of the NGN Y.2014 Network attachment control functions in next generation
networks Y.2015 General requirements for ID/locator separation in NGN Y.2021 IMS for Next Generation Networks
Y.2031 PSTN/ISDN emulation architecture Y.2051 General overview of IPv6-based NGN Y.2052 Framework of multi-homing in IPv6-based NGN Y.2053 Functional requirements for IPv6 migration in NGN Y.2054 Framework to support signalling for IPv6-based NGN Y.2091 Terms and definitions for Next Generation Networks Y.2111 Resource and admission control functions in Next
Generation Networks
ITU-T NGN Related Recommendations (Y Series)
Colmbo, Sri Lanka, 7-10 April 2009
40
Y.2112 A QoS control architecture for Ethernet-based IP access network
Y.2113 Ethernet QoS control for next generation networks Y.2121 Requirements for the support of flow state aware transport
technology in an NGN
Y.2171 Admission control priority levels in Next Generation Networks
Y.2172 Service restoration priority levels in Next Generation Networks
Y.2173 Management of performance measurement for NGN
Y.2174 Distributed RACF architecture for MPLS networks
Y.2201 NGN release 1 requirements
Y.2211 IMS-based real time conversational multimedia services over NGN
Y.2212 Requirements of managed delivery services
Y.2213 NGN service requirements and capabilities for network aspects of applications and services using tag-based identification
Y.2232 NGN convergence service model and scenario using Web Services
ITU-T NGN Related Recommendations (Y Series)
Colmbo, Sri Lanka, 7-10 April 2009
41
Y.2233 Requirements and framework allowing accounting and charging capabilities in NGN
Y.2234 Open service environment capabilities for NGN
Y.2235 Converged web-browsing service scenarios in NGN
Y.2261 PSTN/ISDN evolution to NGN
Y.2262 PSTN/ISDN emulation and simulation
Y.2271 Call server based PSTN/ISDN emulation
Y.2401 Principles for the Management of the Next Generation Networks
Y.2601 Fundamental characteristics and requirements of future packet based networks
Y.2611 High level architecture of future packet based networks
Y.2701 Security requirements for NGN release 1
Y.2801 Mobility management requirements for NGN
Y.2802 Fixed-mobile convergence general requirements
Y.2803 FMC service using legacy PSTN or ISDN as the fixed access network for mobile network users
Y.2804 Generic framework of mobility management for next generation networks
Useful Links
ITUhttp://www.itu.int
NGN Global Standards Initiative (NGN-GSI) http://www.itu.int/ITU-T/ngn/index.html
SG11 (Signalling & Control Protocols)http://www.itu.int/ITU-T/studygroups/com11/index.asp
SG 13 (Future Networks and NGN)http://www.itu.int/ITU-T/studygroups/com13/index.asp
Colmbo, Sri Lanka, 7-10 April 2009
42