ATIS Next Generation Networks (NGN)

Framework: Requirements and Architecture

Alliance for Telecommunications Industry Solutions1200 G Street, NW

Suite 500Washington, DC 20005

www.atis.org

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Outline

• General Requirements Jim McEachern, Nortel

• End User Applications (Use Cases)• Network Service Enablers• Underlying Network Capabilities

• Business Models Driven Req. Andrew White, Qwest

• US Regulatory Requirements

• Framework Reference Bhumip Khasnabish, Verizon

Architecture

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ATIS

Next Generation Networks (NGN):

» General Requirements

» End User Applications (Use Cases)

» Network Service Enablers

» Underlying Network Capabilities

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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:- 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

xDSL

WiFi

Cable

Private Lines

Wireless

Core NGN Subsystems

…

ATIS does not specify that the NGN must support all

access technologies

• 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

• 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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Target NGN

General Requirements: Infrastructure Evolution

PSTNPSTNEmulationSubsystem

PSTNSimulation

Full PSTN Feature Transparency=> Secondary NGN objectiveFull PSTN Feature Transparency=> Secondary NGN objective

SIP (IMS) Services & Architecture => Primary NGN objectiveSIP (IMS) Services & Architecture => Primary NGN objective

IMS“SIP” services

Evolution to NGN

“Perfect Simulation”

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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-to-

end 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

• QoS • Communication Context• Policy • Media Resource Functions• Presence • Media Gateway Functions• Personal Profiles • Session Management• Multicast • Nomadism & roaming• Location • Personal Information Mgmt• ENUM • Content & service discovery

• Digital Rights Management

Network service enablers were defined as network-based communications services that bring value to consumer applications

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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. E9-1-1) require location information- Location may also be a value-add 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. - 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

IPCAN, IMS & applications• Integrity

- Level required will depend on the application• Confidentiality & Privacy

- Essential for NGN capabilities

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ATIS Next Generation Networks (NGN):

» Business Model Driven Requirements

» US Regulatory Requirements

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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

• 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

• 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

• 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

• 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

• 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- E9-1-1

• Operations Requirements- Number Portability

- Number Pooling

- Accounting

- FCC Rules

ATIS Next Generation Networks (NGN):

» Framework Ref. Architecture

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Convergence in ATIS NGN

Focus of NGN is converged user-centric Voice & Data services, irrespective of the access & transport technologies used or deployed

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

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

Questions & Answers (Q&A)

• The ATIS NGN Framework, Part I is included in the materials for the ATIS & TISPAN Joint Meeting on NGN (i.e., compact-disk).– also available from ATIS’ web site: http://www.atis.org

• Feedback and comments on the ATIS NGN Framework are welcomed.– Send feedback to: Tim Jeffries, ATIS (tjeffries@atis.org)