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Simple provisioning, complex consolidation – An approach to improve the efficiency of provisioning oriented optical networks Tamás Kárász Budapest University of Technology and Economics, Department of Telecommunications E-mail: [email protected] 1 Outline • Motivations • Fast provisioning in optical networks • Network consolidation • „Simple provisioning – complex consolidation” approach • Summary and Conclusions 2 Motivations • Paradigm changes in the transport network development: - POTS era: the design and dimensioning were based on traffic forecasts (dominant voice traffic, models, measurements) - Internet era: the permanently increasing data traffic becomes the largest traffic component → the modelling and forecasting of services and traffic growth are significantly more difficult → intelligent configuration flexibility or inefficient capacity over-dimensioning are needed → Traffic Engineering (IP layer) → fast provisioning (optical layer) 3 Fast provisioning in optical networks • Clients generate permanent, long lasting optical channel requests spread in time and space • Distributed signalling and switching intelligence in the optical network nodes • Routing and wavelength allocation (RWA) problem is solved on-line • Suboptimal decisions Practical Case Theoretical Lower Bound • Consolidation Optical channel requests Optical channel demands arriving spread in time and space are served one by one by a distributed and flexible network intelligence applying on-line provisioning algorithms. Consolidation: rearrangement of already arrived and served requests Low assumed to be known in advance (based on a proper forecast) and an optimal network configuration is designed to meet the demands. High Network Efficiency 4 Provisioning Oriented Optical Networks Three-phase lifecycle: • Provisioning: - to set up optical lightpaths performing on-line decisions and configuration actions → suboptimal decisions - the decisions cover both path selection and wavelength assignment - different resilience options can be specified for the optical channel requests • Consolidation: - reconfiguration decisions based on the knowledge of a certain group of optical channel requests is definitely more efficient - sequence of reconfiguration actions is needed to set up the obtained optimal network state Extension - different objective functions can be used of the network • Extension of the network - additional resources are designed and installed to remove network bottlenecks Optional Consolidation Rearrangements to achieve the optimal configuration Provisioning Network configuration to serve dynamic requests 5 Network consolidation Some questions to be answered: • when (how frequently) • what (which subset of accommodated demands) • how (which network parameters to modify) • limitations (operational cost, service risk, live traffic) 6 When to consolidate? • Predefined fixed periods • Network state dependent adaptive periods 600 CONS(25) resource of usage 500 CONS(50) CONS(100) 400 CONS(200) 300 200 100 0 0 50 100 150 200 after number of arrivals 7 What to consolidate? • Total: each already arrived and accommodated demands • Selective: demands meeting specific rules 537 540 520 500 480 458 460 447 440 Provisioning CONS(last_40) CONS(200) 540 520 500 485 490 479 480 479 481 472 460 440 Share_20% Share_30% Share_40% Share_50% Share_60% Share_80% 8 How to consolidate? • Total: re-design and re-configure demand accommodations (working and backup path and wavelength) • Selective: e.g. re-design and re-configure backup path and wavelength only • Architectural: provisioning parameter, resilience architecture Provisioning resource of usage 140 120 100 ILP 80 60 40 20 0 0 10 20 30 after number of arrivals 40 Permanent working path and wavelength Permanent working path 9 Simple provisioning, complex consolidation • Provisioning with dedicated path protection • Consolidation with shared (backup) path protection • Different consolidation strategies: - fixed working path and wavelength CONS(12)_shared_fixed working & protection paths CONS(12)_shared_fixed working path & wl. CONS(12)_shared_optimal allocation Provisioning without consolidation 300 - fixed working and protection path 250 resource of usage - optimal allocation 200 150 100 50 0 0 10 20 30 40 50 60 70 after number of arrivals 10 Simple provisioning, complex consolidation • Different frequently consolidation: CONS(12)_shared_fixed working path & wl. CONS(24)_shared_fixed working path & wl. CONS(36)_shared_fixed working path & wl. 250 resource of usage 200 150 100 50 0 0 10 20 30 40 50 60 70 after number of arrivals 11 Summary and Conclusions • Three phase lifecycle for Provisioning Oriented Optical Network Design • When, what, how to consolidate • For higher efficiency the consolidation can be extended to a higher architectural level of networks • „Simple provisioning – complex consolidation” approach 12 Thank you for your attention! 13