Optical-Packet-Net-Convergence-EHernandez-Broadnets 2006.ppt

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  • Designing an optimum system is not simply selecting from available components but rather understanding the applications and requirements and optimizing the architecture accordingly with respect to both performance and cost, and at the same time managing the complexity of the system design. Basic Sub-system for NG-Reconfigurable Systems include : Wavelength Selective Switches (WSSs), integrated Planar Lightwave Circuits (iPLCs) Wavelength Blockers Full-band tunable lasers, tunable/electronic dispersion compensators, advanced modulators (for 40Gb/s) simplify system operation and increase capacity Next generation DWDM systems that are generally classified as ROADMs (re-configurable add/drop multiplexers) provide the ability to Remotely configure (under software control) which wavelengths are added/dropped, or expressed through a node. The enabling component technologies for ROADMs have various tradeoffs between filter bandwidth, cascadeability, switching times, scalability to mesh, reliability, integration, and cost.
  • Point of course is to deliver new generation of blended services to subscribers.
  • The Service Control Functions (SCFs) represent the functionality of service/session control layer, which provides applications with the control of IP bearer resources when required. It is capable of communicating with the PDF to transfer dynamic QoS-related service information. RACF Functional Entities: PDF (Policy Decision Functional Entity): is the final decision point of resource admission control, which is layer 2 networking technology independent and is a single reference point to the service stratum for providing an abstract view of transport layer and making service/session control functions being transport technology transparent/independent. Given an IP address pair and required QoS resource (e.g. BW), determine if the given flow can be supported in the network, and perform the gate control TRCF (Transport Resource Control Functional Entity): is layer 2 network technology specific, which consists of different functional entities for different network segments (i.e., access TRCF, core TRCF and Interconnection TRCF). For different types of access and core network technologies, the implementation of TRCF instance may vary. Monitor network resource utilization and network topology to estimate path bandwidth availability BGF (Border Gateway Functional Entity): is the policy enforcement point in the media layer, which is not part of RACF but needs to interact with RACF to fulfill the resource and admission control process. Provides media path functions such as gate and Firewall NAPT translation/Media relay Can provide congestion/capacity information to the TRCF

Transcript

  • 1. Building Ethernet/IP Service Awareness into NG Optical Transport Networks Enrique Hernandez-Valencia Lucent Technologies Broadnets, October 2006
  • 2. Market Trends: Growth of Voice & Data Metro Traffic Sources: Pyramid Research, March 2006, Pyramid Research, June 2006 + Bell Labs Analysis Sources: IDC, September 2005, Ovum RHK, December 2005 + Bell Labs Analysis
    • Increased demand for wireless voice services tempered by decline in voice bandwidth driven by shift to compressed audio (mobility & VoiP)
    • Continue growth in broadband business services and Internet traffic driven by P2P applications such as multi-media, audio/music, games and video
  • 3. Source Report :IDC, April 2006
    • The U.S. market for Ethernet services is growing at a healthy pace
    • IDC predicts that the U.S. market for Ethernet services will grow to $2.7 billion in 2010, a compound annual growth rate (CAGR) of 33.8%.
    • Ethernet is replacing other Layer 2 services and private lines
    • Service Providers are investing in Ethernet connectivity services, upgrading infrastructure to carrier grade, with improved Quality of Service and associated SLAs.
    U.S. Business Ethernet Service Forecast
  • 4. Market/Technology Trends and Network Implications New Revenue Producing Differentiated Services Blended Lifestyle Apps Fixed Mobile Convergence
    • Increased IP awareness in mobile network elements
    • Flexible IMS based Service Architecture
    Increased Bandwidth Needs for Multi-Media Services More efficient, low cost data networking architectures Simplified Network Architecture Enabling Converged Services
    • Leverage low cost Ethernet transport & switching
    • Leverage flexible WSS
    • “ Flatten” Network L3 capabilities toward the edge
    Near-Term Mid-Term
    • Reduce Network Complexity while supporting
      • Security & QoS
      • Scalable Capacity
      • Performance & Reliability
    • Consolidate transport functions and minimize Interface types
    • Integrate Optical/Packet Traffic Engineering
    • Secure & controlled access to intelligent net elements
    Long-Term
  • 5. Factors Impacting Long Term Network Architecture Evolution
    • Network Operators drive for simpler transport network infrastructure
      • Ethernet as convergence layer for packet access & transport services
      • Synergistic with introduction of Business Ethernet services
    • End-user Services shift from Internet Access & VPN to VoIP, Multimedia, and Peer-to-Peer apps
      • Driving convergence of wireless & wireline transport infrastructure
      • IP traffic will have an increasingly localized component
    • Blended/Bundled Business & Lifestyle services emerge as key features to SP differentiation
      • Increased L3 awareness in transport elements ( IP awareness )
      • Important to have consistency across transport layers for per-session gate, QoS, and bandwidth control
    • Compound growth from rising broadband subscriber base, service take, and bandwidth per session
      • Drives need for more transport capacity
      • Drives need for more efficient transport and processing network elements
    Drive towards consolidation of service functions at the edge, localized switching, and high capacity switched IP/Ethernet transport
  • 6. Optical and Data Transport Networks Current Architecture & Services
    • Using multiple networks for different services is costly and inefficient
      • Results in higher costs for delivering Regional / Metro Ring Services to enterprises
      • Complex service provisioning via various network layers
      • Stranded bandwidth across multiple layers of interconnect
      • Expensive network maintenance and spare stocks
    Copper Access DSL DSLAM SDH SONET / EoS TDM & Ethernet PL Services Wireless Backbone One network per service type approach is blocking further OPEX & CAPEX reductions DWDM Metro Backbone / Regional Metro MPLS/IP OXC Wavelength Services DWDM Metro Aggregation SDH / SONET IP / MPLS Metro/Reg Office Voice Video MSE Local Office Voice Switched Ethernet Services Ethernet EoF
  • 7. Video Will Redefine NG Transport Networks
    • IPTV and Video on Demand (VoD) will redefine the Access and Aggregation network space
      • VoD/IPTV grow by orders of magnitude over the next 5 years
      • 2005: 90% best-effort data traffic
      • 2010: 40% high-priority VoD traffic 50% best-effort data traffic
      • Carrier-class links with capacities of 40G and100G required in MAN
    Service providers need to deploy scaleable, efficient and secure transport networks that enable innovative multimedia services while providing carrier-class performance and manageability Source: Bell Labs IPTV/VoD study, May 2006
  • 8. Implications of Broadband & Triple Play Services on Access/Aggregation Network
    • New Broadband & Multimedia services (IPTV, VoD, VoIP & games) place additional requirements on the SP network infrastructure:
      • Bandwidth scalability : support for real-time broadband applications (i.e., VoD, Gaming)
      • High availability : short restoration, no general outages
      • Service differentiation : latency, jitter, packet loss in SLAs
      • Resource management : granular bwd, traffic engineering, resource management & reservation in support of SLAs
    • Carriers have made a strategic decision that their next-gen feeder/aggregation infrastructure will be Ethernet-based:
      • Yet, “Best Effort” forwarding model will not meet carrier requirements for scalability, quality, and OPEX/CAPEX
      • Transport network must support a superior IP-aware Quality of Experience to attract and retain customers
  • 9. Converged Optical & Data Network Evolving Transport Architecture in Support of Broadband Services
    • CMTP converges Wavelength, TDM and Packet services onto a common platform
    • Improved price competitiveness in delivering Regional / Metro Ring Services to enterprises
    • Inter-works with existing network elements
    • Enabled Network evolution with tight integration to ITU NGN models
    • Drastically reduces equipment needs in Metro & Regional Hub offices
    • Minimizing spare stock & network maintenance efforts
    SONET / EoS Optical PL & EPL Services MSPP MSPP MSPP Ethernet EoF LER LER LER Virtual Fiber Services xWDM Converged Multi-service Transport Platform Converged Multi-service Transport Platform MSTPs MSTPs Single transport infrastructure for packet and circuit services E-LAN, TLS & PW Switched Services DWDM Metro Backbone Or Regional Metro MPLS/IP OXC Metro / Regional Office Metro / Regional Office
  • 10. Converged Multi-Service Transport Platforms Architectural Requirements
    • Converging WDM, TDM and Packet into a single platform
    • Separated Planes for TDM & Packet & WDM
      • Optimized architecture for each network plane
      • Optimized switches & I/O packs for each plane
    • Flexible/cost optimized hybrid configurations
      • Unrestricted usage of each plane as needed
      • Full system bandwidth utilization & scalability
      • Dedicated interconnection units using regular I/O slots following strict “plug and pay what you need” paradigm
    • Complexity Reduction, Reliability Increase
      • Cross plane system control providing single or segregated node view
      • Independent subsystems with well defined interfaces
      • Easy operational concept following clean layering model
    System Control Packet Fabric TDM Fabric TDM I/O Packet I/O Packet I/O TDM I/O DWDM I/O cWDM I/O ROADM Packet Plane TDM Plane WDM Plane Packet Control Plane TDM Control Plane Optical Control Plane
  • 11. Converged Multi-Service Transport Platforms Packet Attributes
    • Packet optimized adaptation for all types of L2 traffic (Ethernet, HDLC, PPP, FR, …) with idle suppression capabilities MPLS Pseudo Wires (IETF PWE3)
    • Data-aware transport with ring/mesh-wide efficient statistical multiplexing for all data services via MPLS forwarding and aggregation
    • IP/MPLS control plane as a common mechanism for A-Z path management that can seamlessly interwork with existing IP/MPLS long-haul networks
    • VCAT, GFP & LCAS to interwork with existing underlying SONET/SDH & OTN networks
    • xDSL/PON, PB/PBB & RPR support to interwork with existing underlying Ethernet access networks
    IP-PBX ATM/FR VoIP/SS SONET/SDH ADM Converged Multi-Service Transport Platform IP/Ethernet MPLS WDM / OTN SONET (EoS) Ethernet/MPLS FIBRE DWDM SDH ATM POS RPR Ethernet MPLS ATM FR Ethernet IP Other FIBRE DWDM SDH ATM POS RPR Ethernet MAC MPLS ATM FR Ethernet IP Other Ethernet PHY
  • 12. Role of ROADM in NG Transport
    • Network operators are finally adopting Reconfigurable Optical Add/Drop Multiplexers (ROADMs) technology
      • Multiply fiber capacity through wavelength division multiplexing (WDM),
      • Enhance network flexibility with remotely reconfigurable optical add/drop
      • Reduce transport network capital and operation expenses by using optical bypass when optimally deployed
      • First generation ROADMs were degree-2 network elements (NEs) and supported linear chain and ring architectures.
      • Next ROADM generations has 4 or higher degrees allowing a flexible ring/meshed network topology
      • Hybrid Network Elements (NE’s) integrating SONET-ADM or Packet-ADM functionalities into ROADM
    DWDM Line System 1 st Gen: Fixed 2-Degree ROADM OA 2 nd Gen: 4+ Degree ROADM ROADM Components Add/Drop & Thru Any  to any port
  • 13. Converged Multi-Service Transport Platforms TDM/WDM Attributes
    • Multi-degree ROADM (WSS) with
      • 2.5G up to 40G wavelength support
      • Over 40 channels per system
      • Full-band tunable lasers
    • Full integration with OTN and SONET/SDH
      • STS/VT and VC muxing and switching (SONET/SDH/G.707)
      • ODU muxing and switching (OTH/G.709)
    • ASON/GMPLS control plane for automated provisioning & network inventory
    Kilometers WDM TDM Packet Customer Prem. Metro Access Metro IOF Regional Long Haul Ultra Long Haul MSTP 0 100 300 600 1200 4000 Capability DWDM OADM MSPP cWDM OXC CMTP FIBRE DWDM SDH ATM POS RPR Ethernet MPLS ATM FR Ethernet IP Other FIBRE DWDM SDH ATM POS RPR Ethernet MAC MPLS ATM FR Ethernet IP Other Ethernet PHY
  • 14. Evolving Beyond Legacy Transport Models From Quality of Service to Quality of Experience Broadband Data Local Voice Storage Area Networking Carrier Ethernet Services Wavelength Services IP Video Services Managed Internet Service Feature Driven Long Distance Premium Video Converged Services Drive QoE Requirements
    • Support Converged Services on a Massive Scale
      • Efficient routing, flexible service delivery across multiple access technologies
      • Service Aware QoS – VoIP, BB, Video
      • Video applications driving additional growth in network usage
    • Provide automated management, integration and maintenance services
      • Dynamic, continuous session-state, end-to-end QoS
      • Service aware to efficiently manage costs
      • Network QoE: Scale, QoS, Reliability, Resiliency
      • Multi-network, multi-vendor management
      • Legacy Migration, wireless/wireline convergence
    TDM Services Ethernet Services Private Line Services VPN Services IP Video
  • 15.
    • ITU-T Y.2001/Y. 2011provides a framework for NG IP-Aware transport networks
    • RACF is a functional component of the NGN architecture that enables real-time, session based resource control for a variety of services and a variety of networking technologies
      • Keeps services technology-independent
      • Keeps the network service-independent
    Converged Transport Networks and ITU-T Next-Generation Networks NGN RACF IMS Service Control Functions Non-IMS Service Control Functions (e.g. VoD) Radio Access Network DSL Access Wimax IP/MPLS Core Metro Optical/ Ethernet Other NGNs
  • 16. The ITU-T RACF (Y.2111) Architecture Rs Rw Service Stratum Transport Functions Policy Decision Function Transport Resource Control Function RACF Transport Stratum Service Control Functions (part of IMS or other) Rt Rd Rp Rc Rn Ru Ri Transport Enforcement Function Policy Enforcement Function Network Attachment Control Functions
    • Policy Decision Function
    • Service-facing, transport-independent
    • Transport Resource Control Function
    • Service-independent, transport-dependent, network-segment-specific
    • Policy Enforcement Function
    • typically part of border transport elements
    • RACF
    • Augments native transport QoS support
      • Timely preempting traffic during congestion
    • Is applicable to IMS and non-IMS applications (e.g., VoIP and IPTV)
    • Can be deployed edge-to-edge or end-to-end
    intra- domain inter- domain Other NGN s
  • 17. Key Roles of RACF and Related Entities
    • Policy Decision Function
    • Makes the overall admission decision based on policy and resource availability (including path and enforcement point selection)
    • Applies resource controls to the transport for bandwidth allocation, packet marking, gating, NAPT, etc.
    • Transport Resource Control Function
    • Tracks transport resource use and network topology
    • Performs resource-based admission control
    • Policy Enforcement Function
    • Enforces controls applied by PDF
      • Policing
      • Filtering
      • Charging/Metering
      • NAT and NAT Traversal
    • Overall, RACF supports
    • Relative and absolute QoS, including differential priority
    • Endpoints of varied QoS control capabilities
    • Push and pull models for policy installation
    • Multiple transaction models for resource requests
    • Various resource management methods based on accounting , measurement and reservation
    • Existing and emerging transport QoS mechanisms
  • 18. Next-Gen Transport Networks Intelligent Ethernet/IP-optimized Network Strategy
    • Converged MS Transport Architecture
    • Integrated Ethernet/Optical Metro - reduced network complexity and costs
    • Service Intelligent Access - efficient routing, flexible service delivery across multiple access technologies
    • Policy Based Service Aware QoS - based on individual applications, user needs
    • Delivers:
      • Simplified, flexible architecture – scalable, reliable designed for QoE
      • Ultimate user experience - seamless and secure management across multiple devices & networks
      • Innovative blended services with IMS
      • Flexible network integration for investment protection
    IMS Non -IMS RACF Ethernet / Optical Metro Intelligent Access IP/MPLS Core Service-aware QoS Service Integration Access Nodes Ethernet Edge Ethernet /MPLS Routers Optical/Ethernet Routers Management System PON DSL CDMA Fiber Bearer Gateway Functions Ethernet/MPLS Routing Application Aware QoS CMTP BGW Copper GSM UMTS Mobility Routers
  • 19. Conclusion
    • An intelligent optical/packet optimized network enables:
      • Fewer network elements and layers via an integrated Carrier Ethernet/Optical Metro Core
      • Service intelligent access for efficient routing and service activation across multiple access technologies
      • Policy-based bandwidth/QoS control spanning entire network, based on individual applications and user needs/SLAs
      • Support of a superior Quality of Experience to attract and retain customers
    A simplified, flexible converged network infrastructure enabling providers to deliver profitable Next Gen blended services