Simple provisioning, complex consolidation

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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 karasz_at_hit.bme.hu
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Outline

• Motivations
• Fast provisioning in optical networks
• Network consolidation
• Simple provisioning complex consolidation
  approach
• Summary and Conclusions

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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)

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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
• Consolidation

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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
• different objective functions can be used
• Extension of the network
• additional resources are designed
• and installed to remove network
• bottlenecks

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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)

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When to consolidate?

• Predefined fixed periods
• Network state dependent adaptive periods

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What to consolidate?

• Total each already arrived and accommodated
  demands
• Selective demands meeting specific rules

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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

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Simple provisioning, complex consolidation

• Provisioning with dedicated path protection
• Consolidation with shared (backup) path
  protection
• Different consolidation strategies
• fixed working path and wavelength
• fixed working and protection path
• optimal allocation

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Simple provisioning, complex consolidation

• Different frequently consolidation

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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

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Thank you for your attention!