international telecommunication union migration towards ngn - ogs cairo (egypt), december 2009...
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InternationalTelecommunicationUnion
Migration towards NGN - OGSCairo (Egypt), December 2009
Regional Workshop on Assistance to the Arab Region for the implementation of
Next Generation Networks (NGN)
NGN Migration Strategy and Scenarios
Cairo (Egypt), 15-16 December 2009
Oscar González SotoITU Consultant Expert
Spain [email protected]
InternationalTelecommunicationUnionMigration towards NGN - OGSCairo (Egypt), December 2009 2
Agenda
• Technology migration issues
• Migration strategies per network segment
• Main steps for IMS and NGSS
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NGN Migration Strategy Issues for migration planning
• Where to start migration?
• Which topologies and connectivity are required?
• How network segments change in access , local and core?
• Which level of protection to assure?
• Where to locate new functionalities?
• How to ensure service continuity?
• Others …..
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NGN Migration Strategy Modeling issues for NGN design
New models needed to represent multiservice flows
New dimensioning methods for resources handling multimedia services with QoS
New measurement procedures for aggregated multi-service traffics
New procedures to ensure interoperability and end-to-end performance across multiple domains
Redefinition of network segments at the new structure and for QoS quota assignment
New units to define dimensioning and costing for interconnection
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Network segments: Historical reference configurations
LD circuit TransTransmission
circuit
AN Voice PSTN LE
Customers
CPE voice
CPE data
Transmissiondata
LD data transData BRAS
AN AggregDSLAM
PSTN TE
DATA TR
PSTN Transit
DATA Transit
Metro/Regional
Circuit Trans
Metro/Regional data trans
CPE to Transit network
Access network Local network Metro/Regional
networkTransit network
- Double network in circuit and packet modes- Frequently with separated physical media, transmission and energy
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Network segments: Target full NGN reference configurations
- Integrated network at all layers NGN based on IPv6 network with carrier grade QoS
Core NGN netTransmission
edge
IP Integrated AN
NGN Edge
RouterCustomers
Multiple play
Application servers
equipment
IP Multiservice
CPE Access Transmi
ssionLD integrated
Trans
Edge/Metro/Aggregation network
Core network
NGN Customer to Transit network
Access networkHome networking
Sense for IP mode deployment in NGN
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Network segments: Migration from historical to target NGN
LD circuit TransTransmission
circuit
AN Voice PSTN LE
Customers
CPE voice
CPE data Transmissiondata
LD data transData BRASAN AggregDSLAM
PSTN TE
DATA TR
PSTN Transit
DATA Transit
Metro/Regional
Circuit Trans
Metro/Regional data trans
CPE to Transit network
Access network Local network Metro/Regional network Transit network
Core NGN netTransmissionedge
IP Integrated AN NGN Edge
Router
Customers
Multiple play
Application servers equipment
IP Multiservice CPE Access
Transmission LD integrated Trans
Edge/Metro/Aggregation network
Core network
NGN Customer to Transit network
Access networkHome networking
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Agenda
• Technology migration issues
• Migration strategies per network segment
• Main steps for IMS and NGSS
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Architecture migration: Topology
What changes from current scenario towards target network ?
What changes from current scenario towards target network ?
OtherNetworks
DLC
Control
Transport/Media Distributed Switching
DSL
Wirelessgateway
Softswitch
OSS Services
PacketNetwork
IP/MPLS/CAC
Accessgateway
Accessgateway
Accessgateway
Trunkgateway
SCP
TDM
POTS ISDN
RSURSU
LEX/TEXLEX/TEX
LEXLEX
PCM
DataATM/IP
MUX/DSLAMMUX/DSLAM
NMC
SS7
HDSL/XDSL
NASNAS
Mob
IN
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NGN: Topology migration strategies
• Migration in Overlay :• At transit and international levels• At local level• At access level
• Migration in Island (substitution/extension) • At transit and international levels• At local level• At access level
• Hybrid migration: Overlay and Island combination:• By network levels• By geographical regions • By obsolescence level
Network topology change is more difficult and needs more time that just system substitution
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StructureSimplification
Network Architecture towards NGN Architecture Consolidation: Topology
TRANSIT NETWORKTRANSIT NETWORK
NATIONAL LAYERNATIONAL LAYER
REGIONAL LAYERREGIONAL LAYER
RULAYER
LEXLAYER
Single-layered
TRANSIT NETWORK
Single-layered
TRANSIT NETWORKNATIONAL/REGIONAL
LAYER
NATIONAL/REGIONAL
LAYER
RULAYER
LEX/GWLAYER
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Local Exchanges
Remote Units
LEX LayerLEX Layer
Trunking gateway in each regional site
Packet mode
network
IP links
short distanc
e
Regional LevelRegional Level
Softwitches /MGCs
in few sites
Topology reconfiguration for Core
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Local Exchanges
Remote Units
LEX LayerLEX Layer
Trunking gateway in each local site
Packet mode
network
IP links
Long distance
Regional layerRegional layer
Softswitches/MGCs located in few sites
Topology reconfiguration for Core
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Core: migration strategy
Dominated by high capacity and protection level • Overlay deployment for full coverage in all regions
• Quick deployment needed for homogeneous end to end connections (2 to 3 years)
• Strong requirements for high quality, protection and survivability
• Importance of the optimization for location and interconnection
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Access gateway
LEX LayerLEX Layer
Packet mode networ
kTrunking gateway IP links
Exchange A
subscriber
“Growth”
Trunking gateway
Exchange A
Access gateway
TEX LayerTEX Layer
Softwitches/ MGCs located in few sites
Local/Edge level migration: grow with NGN
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Obsolete TDM LEXs
Packet mode
network
Access gateway
Access equipment
Rest of the TDM network
Trunk gateways
Access gateways
IP links
Softswitches/MGCs
Local/Edge level migration: substitute with NGN
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Vision by the Metro Ethernet Forum for LAN to LAN network:
Metro-Ethernet
Customer’s
Ethernet LAN
Telco Central OfficeTelco Central Office
Traditional Telco Network
CSU/DSCsRouter
s
Copper Serial Input
Copper
Local Loop
ATMMUXSonet ADM
Voice-oriented connectivity
CSU/DSCsRouter
s
Copper Serial Input
ATM MUXSonet ADM
Copper
Local LoopCustomer’
sEthernet
LAN
Optical IP Network
Managed Switch
located in building telco
closet
Optical Gigabit Ethernet throughput
Managed Switch GB WAN
RouterGB WAN Router
Long Haul Fiber Metro Fiber RingMetro Fiber Ring Customer’sEthernet
LAN
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Local/Edge network migration
Dominated by functions migration investment and interoperability
• Move from joint switching and control to separated control and media GW
• Introduce Multimedia Services at all areas
• Optimize number, location of nodes and interfaces among existing and new network
• Requires longer time and higher investments due to variety of geo- scenarios and geographical distribution
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Access Network Migration:Physical network today
Structure of the OSP Access Network in most scenarios
SDF
SDF
SDF
FDF
FDF
main cable
branching cablesdrop line
MDF
.
.
.
.
SDF
drop line..
.
.
.
.
RegionalExchange
Core/Local network Primary OSP network Distribution OSP network
NTBA
LocalExchange
MDF Main Distribution FrameFDF Feeder Distribution FrameDSLAM Digital Subscriber Line Access ModuleMSAN Multiservive Access NodeSDF Subscriber Distribution Frame
SDF
ISDNbasic rate
FOOpticalInterface
AN:DLCDSLAMMSAN
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Access Network Migration:Physical network evolution
Typical trend for Access Network infrastructure evolution
Core/Local Primary OSP network Distribution OSP network
SDF
SDF
SDF
AN
branching cablesdrop line
OpticalInterface
.
.
.
...
NTBA
LEX/GW
LEX Local ExchangeGW GatewayMDF Main Distribution FrameAN Access Node SDF Subscriber Distribution FrameFO Fiber Optic
AN
ANdrop line .
.
FO
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Network Architecture towards NGNArchitecture Consolidation: Access
Access dominated by physical infrastructure cost and deployment time:
“first to start and later to finish”
• Quick deployment of DSL and Multimedia Services
• FO closer to customer when implementing new outside plant or renovating existing one
• New Wireless technologies for low density customer scenarios
• Shorter LL length than classical network to be prepared for high bandwidth Multimedia services
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Where to start and how to co-ordinate migration sequence?
Network “consolidation” for topologyCost Optimisation of the network
- Reducing nodes and increase their capacity- Deployment of ADSL and multiservice access
Network expansionNGN solution :
- Cap and Grow; this means keeping the existing PSTN network as it is, and grow demand with NGN equipment
Network replacementReplacement of out-phased (end of life) TDM equipment
- gradual replacement : this means coexistence of the two technologies - full accelerated replacement with a short transition period
Need to optimize overall network evolution: technically and economically
Topology migration: combined segments
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Overall Network Structure Architecture at transition stage
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Agenda
• Technology migration issues
• Migration strategies per network segment
• Main steps for IMS and NGSS
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Network Architecture towards NGN: IMS Architecture
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- First advantage is the higher flexibility of the IMS functionality to adapt to the customer services, irrespective of the technology they use and the access method to reach the network.
- Saving in effort and time for the development and deployment of a new service is considerably reduced once the architecture is ready at the network, implying economic savings and better Time to Market for a given service provider in a competitive market.
- Efficient introduction on new services at a lower cost will increase the service provider revenues and ARPU which is the major business driver for the healthy operation, market grow and financial results.
- Higher utilization of services and better personalization of functions to specific requirements from the end customers’ point of view, a common use and feel for all services and applications
Network Architecture towards NGN: IMS Benefits
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Evolution to IMS: Phases
Convergence to
NGN infrastructure
Current Service
functionality
Partial IMS functionality and/or coverage
Full IMS coverage
Full HSS, P2P video,
Service broker, Service blending,
RACF, ICD, etc.
Convergence to
IMS services
PSTN
NGN IP core
End to End NGN
PSTN Architecture
Pre - IMS
PSTN emulation/simulation
Full IMS “SIP” Services Open Service Architecture,
Basic HSS, VoIP, LBS, PBS, IM, PtS, etc.
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Evolution to converged OSS/BSS: Classical requirements
- Inventory management,
- Network engineering,
- Order management,
- Network elements supervision,
- Application monitoring,
- Traffic measurement and post processing,
- Capacity augmentation,
- Routing planning,
- Trouble ticketing,
- Repair management,
- Workforce management,
- Service activation,
- Service creation,
- Customer Relations Management (CRM),
- Rating,
- Billing,
- Invoicing,
- Performance supervision,
- Accounting management,
- Pricing agreements,
- SLA management
- Support to Marketing & Sales, etc
Typical functions for the OSS and BSS imply a vast set of activities in current networks like:
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Evolution to converged OSS/BSS: New requirements
- In addition to conventional typical functions, new requirements and higher relevance for existing tasks are needed in the NGN IP mode technology as follows:
- Managing support to multimedia services with voice, data, video and multiple play- Security policy management,- Content management,- Managing inter-domain operational activities - Managing functionalities for the coexistence of legacy and new technologies- Implementing new business procedures associated to bundled offers - Manage multimedia/multiparty charging application- Service Level Agreements (SLA) management,- Service creation and upgrading management,- Focus on common processes to all support functions and technologies
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Evolution to converged OSS/BSS: Phases
Separated OSS, BSS
and Platforms
Integrated OSS/BSS inCommon Platform
BSS
PSTN
DATA
MOBILE
OS
S A
pp
licati
on
1
OS
S A
pp
licati
on
2
OS
S A
pp
licati
on
n
BSS/OSS
PSTN
DATA
MOBILE
OSS Applications
OSS Middleware
Integrated IT Platform
Migration from legacy support systems in vertical piles towards integrated OSS/BSS in an IT platform per network type
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Evolution to converged OSS/BSS: Phases
Integrated OSS/BSS inCommon Platform Full Integrated NGSS platform interworking
with IMS
BSS/OSS
PSTN/DATA
MOBILE
OSS Applications
OSS Middleware
Integrated IT Platform
NGSSbased on
(SOA)
BSS/O
SS
Applic
ati
ons
Transport Stratum
Service Stratum
Third Party Applications
Transport Functions
Transport Control Functions
Service Control Functions
IMS
Applic. Support Functions
IMS Architecture
Migration from IT platforms per network type towards New Generation OSS/BSS for an NGN multiservice network with IMS functionality
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Matching evolution to NGN, IMS and NGSS
Convergence to
NGN infrastructure
Separated OSS and BSS platforms for PSTN,
Mobile,& Data
OSS/BSS Integration forPSTN and Data
Full Integrated platformFixed + Mobile & federated with IMS
Convergence to
Integrated OSS/BSS
PSTN
NGN IP core
End to End NGN
PSTN Architecture
Pre - IMS
Coexistence for PSTN and NGN
Full IMS “SIP” Services
- Open Service Architecture
- Integration of OSS and BSS functionalities
- NGSS based on “SOA”
Incorporation of new operations for IMS new services
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NGN Migration Strategy: Conclusions
Network Topology migration is the base for architecture modernization and requires
an overall re-design
Different timings apply to 5 network areas: Access, Core, Local/Edge, Services and
OSS/BSS
Per country coordination is required for Migration at each area