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Routing Algorithms for SDM Flexible Optical Networks.

Entropy (Basel, Switzerland)·2024
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Towards an Efficient and Exact Algorithm for Dynamic Dedicated Path Protection.

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The Trade-Offs between Optimality and Feasibility in Online Routing with Dedicated Path Protection in Elastic Optical

Ireneusz Olszewski1, Ireneusz Szcześniak2

  • 1Faculty of Telecommunications, Computer Science and Electrical Engineering, Bydgoszcz University of Science and Technology, S. Kaliskiego 7, 75-796 Bydgoszcz, Poland.

Entropy (Basel, Switzerland)
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Summary

We developed three algorithms for routing and spectrum allocation in elastic optical networks. A heuristic algorithm works well under low network load, while exact algorithms evaluate performance and guide optimization for reduced blocking probability.

Keywords:
branch and bound methoddedicated backup path protectionelastic optical networks

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Area of Science:

  • Optical Networking
  • Telecommunications Engineering
  • Computer Science

Background:

  • Elastic optical networks (EONs) require efficient routing and spectrum allocation (RSA) strategies.
  • Dedicated path protection is crucial for network resilience and service continuity.
  • Online RSA with protection presents significant computational challenges.

Purpose of the Study:

  • To propose and evaluate novel algorithms for the online routing and spectrum allocation problem with dedicated path protection in EONs.
  • To compare the performance of a heuristic approach against exact solutions based on branch and bound.
  • To determine optimal path cost or length strategies for minimizing bandwidth blocking probability.

Main Methods:

  • A minimum-cost-maximum-flow heuristic algorithm assuming shared spectrum for working and backup paths.
  • Two exact algorithms utilizing the branch and bound method to find minimum total cost and minimum total length paths.
  • Extensive simulation research to evaluate algorithm performance under various network conditions.

Main Results:

  • The heuristic algorithm is viable for EONs under low network load, offering a simple and fast implementation.
  • Exact algorithms provide benchmarks for performance evaluation and identify optimization targets.
  • Optimizing total path cost yields a slightly lower bandwidth blocking probability than optimizing total path length.

Conclusions:

  • The proposed heuristic algorithm offers a practical solution for EONs with dedicated path protection, particularly in scenarios with limited network traffic.
  • Branch and bound methods are effective for finding optimal solutions and understanding trade-offs in EON resource allocation.
  • Minimizing the total cost of paths is a slightly more effective strategy than minimizing total length for reducing blocking probability in EONs.