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ATIS:
Next Generation Networks (NGN)
Framework: Requirements and
Architecture
Alliance for Telecommunications Industry Solutions
1200 G Street, NW
Suite 500
Washington, DC 20005
202/434-8828
Outline
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General Requirements
End User Applications (Use Cases)
Network Service Enablers
Underlying Network Capabilities
Business Model Requirements
US Regulatory Requirements
Framework Reference Architecture
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General Requirements
• Interconnection
• Convergence (fixed / mobile / enterprise)
• Access network criteria
• Infrastructure evolution & Legacy services
• end-to-end transparency
• Services guiding principles (for converged networks)
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General Requirements: Interconnection
• Specify a packet based interconnection, suitable for carrier
interconnect, that will support:
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security
QoS
reliability
billing support
service transparency
performance measurements, monitoring, codecs, etc…
• Support interconnection between different classes of service
providers (e.g. Next Generation Service Providers &
Application Service Providers)
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General Requirements: Access Independence
Cable
xDSL
Private Lines
WiFi
Wireless
…
ATIS does not specify that
the NGN must support all
access technologies
Core NGN
Subsystems
• Instead, ATIS identifies conditions for support of an IPCAN
• IP
• support provision of QoS consistent with Y.1541
• transport level encryption restricted to IPCAN
• may support admission control
• mobility management consistent with NGN Core
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General Requirements: Infrastructure Evolution
Evolution to NGN
SIP (IMS) Services & Architecture
=> Primary NGN objective
PSTN
PSTN
“Perfect
Emulation
Simulation”
Subsystem
PSTN
Simulation
IMS
“SIP” services
Full PSTN Feature Transparency
=> Secondary NGN objective
Target NGN
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General Requirements: Services
• End-to-end transparency
• backward compatibility for “best effort Internet”
• NGN network services may be incompatible with end-toend transparency
• Service environment
• service development independent of network & application
protocols
• SIP as core signaling protocol
• also support service APIs (e.g. Parlay / OSA)
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End User Applications
• Selected representative end user services as “use cases” to test
and validate NGN requirements. Identified the network
service enablers that would be required for application.
• Interactive voice
• Content-based services / video
• Multi-media conferencing
• Content sharing
• Interactive gaming
• Sensor and control networking
• Mobility management (wireless / wireline)
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Network Service Enablers
Network service enablers were defined as networkbased communications services that bring value to
consumer applications
• QoS
• Policy
• Presence
• Personal Profiles
• Multicast
• Location
• ENUM
• Communication Context
• Media Resource Functions
• Media Gateway Functions
• Session Management
• Nomadism & roaming
• Personal Information Mgmt
• Content & service discovery
• Digital Rights Management
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Network Service Enablers: QoS
• QoS has been identified as one of the key Release 1
requirements for NGN
• end-to-end
• inter-carrier
• evolve incrementally from existing best-effort networks
• can use complementary techniques
• Network Engineering
• Traffic Engineering
• Packet Scheduling (e.g. Diff Serv)
• Access networks likely to need packet scheduling QoS
mechanisms first
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Network Service Enablers:
Presence & Personal Profiles
• Key capabilities for Release 1 NGN
• endorses the IETF Presence model
• Personal profiles & Personal Information Mgmt complement
Presence, to link services and enable end-user centric model
• Ability to link and unify various identities is a foundation for
many other NGN services
• End-user centric model will enable significant new service
opportunities
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Network Service Enablers
• Policy
• mechanism to ensure consistent application of network
services across various networks and technologies
• consistent policy architecture and protocols required
• Media Resource Functions
• in legacy networks these were linked to specific services
• in the NGN media resources are a generic function
• suitable control mechanism is key
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Network Service Enablers
• Location
• Some services (e.g. E.911) require location information
• Location may also be a value added service
• Network determined location is access specific
• Location may also be CPE derived (Network validation
may be required…)
• Content and Service Discovery
• required to support rapid service introduction
• independent of underlying network technology
• discover services based on “interest” (user or device)
• client-server and peer-to-peer
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Underlying Network Capabilities
• Identifies network capabilities required for NGN, but which
applications cannot directly access. e.g:
• OAM
• security
• authentication
• non repudiation
• etc.
• SLA
• network survivability
• service quality measurement
• mechanisms to predict service quality
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Security
ATIS Security Focus Group has completed a detailed gap
analysis and prepared a work plan to address these gaps.
Topics addressed include:
• Authentication and Authorization
• user, device and network entity authentication required for
IP-CAN, IMS & applications
• Integrity
• level required will depend on the application
• Confidentiality & Privacy
• essential for NGN capabilities
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Business Model Requirements
Significant revenue generation and cost savings
opportunities must justify the substantial
investment required to build the NGN.
The NGN must facilitate running a business
with the efficiency of WalmartTM and the
brand differentiation of Coca-ColaTM.
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Business Drivers
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New Retail Revenue
New Wholesale Revenue
Cost Reduction for Existing Services
Regulatory Requirements
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Methods for Success
• Customization through User Profile
• Transparent Third Party Networks
• Seamless Service Delivery
Service delivery complicated by increased number
of sophisticated interfaces.
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User Profile
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Targeted Services
Rapid and Flexible Service Creation
Integrated OSS/BSS
Converged Customer Relationship
User-specific, location-agnostic services
differentiate product offering.
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Third Party Networks
• Communications Services work across
networks
• Application and Content Services work
across networks
• Architecture must support different types of
mobility depending on offering and
relationship
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Third Party Networks
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Simple end user access & authentication
Secure access to profile
Consolidated settlement
Foreign Network Support for Services
– Location, Presence, etc.
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Third Party Networks
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Services must adapt to access capabilities
Access protocols interwork to the SIP core
QoS and Security must be maintained
End-to-end service may span multiple
independent networks
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Service Delivery
• Blended IT and Telecom Services
• Leverage third party information
– Location
• Support for third party applications
• Service creation process should support new
blended services
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Service Delivery
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Web-based Self Management
Support for third party networks
Wide range of CPE
Scalable and Reliable Platform
Support for NG OSS/BSS
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US Regulatory Requirements
• National Security & Critical Infrastructure
• LAES
• ETS
• Consumer Requirements
• E911
• Operations Requirements
• Number Portability
• Number Pooling
• Accounting
• FCC Rules
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ATIS
Next Generation Networks (NGN)
Framework Ref. Architecture
Convergence in ATIS NGN
Focus of NGN is converged user-centric Voice &
Data services, irrespective of the access &
transport technologies used or deployed
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ATIS NGN Framework
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ATIS NGN: User Side
• User side includes all “User Domain” or
Customer Premises” equipment
– Signaling and bearer interfaces to both IP and
non-IP (wireline wireless) networks are included
– Both managed and unmanaged Customer prem.
networks are supported, including Customer
Network Management (CNM)
– Advanced services like NAPT, FW, I(D/P)S, SLA
monitoring/enforcement need to be supported at
customer edge as well
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ATIS NGN: Other Network
• Other networks include both TDM and IP networks
(wireline & wireless)
– IP network providers interworking with other access
network technologies, such as wireline and wireless
carriers thru appropriate Border Gateway functions
– IP network providers interworking with non-IP network
technologies for example, the PSTN (thru IP-TDM GW)
Objective is to support high-quality ETE revenue generating service —
securely and seamlessly — to the customers, e.g., a handoff for a
wireless handset roaming between a wireless and wireline
infrastructure without degradation of quality
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ATIS NGN: Public Network
• A FOUR layer FUNCTIONAL model is used
• Transport is IP based with appropriate interfaces to User side,
Other networks, and upper layer functional entities (FEs)
• Session admission, authentication and enforcement of policy
are executed via the “Session and Policy” control functions
• Value-added and enhanced services are hosted in servers in
the “Applications and Service Capability” functions
• Service creation, maintenance, and management thru e.g.,
Web portals – including FCAPS – are performed via the
entities in the OAM&P functions
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Interfaces to IP Transport
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Session and Policy Control Functions
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Applications and Service Capability Functions
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Connectivity in a Single Service Provider
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Connectivity in a Multiple Service
Provider Environment
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Multiple Service Provider Environment:
Issues
• Multiple administrative and technology
domains
• Multiple instances of Session policy and Apps
& Service capability functions must interwork
properly to support high-quality ETE revenue
generating service — securely and seamlessly
— to the customers
– Interworking with legacy signaling & control
instances/paradigms is also a must
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Conclusion
Tim to provide
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