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Multi-link weight metric-based routing approaches incorporating link length, resource availability, and penalization in MB-EONs
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DOI：10.1016/j.yofte.2025.104546.png)
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Abstract
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In multi-band elastic optical networks (MB-EONs), efficient routing and spectrum allocation (RSA) are critical for reducing connection blocking. This paper first proposes a multi-metric routing scheme, Path Length ＋ Spectrum Availability (PL＋SA), which jointly incorporates normalized link length and link resource availability for improved path selection. We then extend this approach to a dynamically adaptive version, Path Length ＋ Spectrum Availability with Weighted Penalty (PL＋SA-wP), by introducing link penalization and de-penalization to enhance load balancing and even spectrum distribution. The proposed methods are evaluated against three existing schemes: Path Length (PL), Spectrum Availability (SA), and the Fragmentation-Aware RSA scheme (Frag). Simulation results on NSFNET and USNET topologies show that PL＋SA-wP achieves the lowest blocking probability, and higher throughput. Additionally, analysis for PL＋SA-wP conducted across multiple k-shortest paths demonstrates that k=5 offers a reduced blocking probability than k=1 and k=3.
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