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In 5G networks, slicing allows partitioning of network resources to meetstringent end-to-end service requirements across multiple network segments,from access to transport. These requirements are shaping technical evolution ineach of these segments. In particular, the transport segment is currentlyevolving in the direction of the so-called elastic optical networks (EONs), anew generation of optical networks supporting a flexible optical-spectrum gridand novel elastic transponder capabilities. In this paper, we focus on thereliability of 5G transport-network slices in EON. Specifically, we considerthe problem of slicing 5G transport networks, i.e., establishing virtualnetworks on 5G transport, while providing dedicated protection. As dedicatedprotection requires large amount of backup resources, our proposed solutionincorporates two techniques to reduce backup resources: (i) bandwidthsqueezing, i.e., providing a reduced protection bandwidth with respect to theoriginal request; and (ii) survivable multi-path provisioning. We leverage thecapability of EONs to fine tune spectrum allocation and adapt modulation formatand Forward Error Correction (FEC) for allocating rightsize spectrum resourcesto network slices. Our numerical evaluation over realistic case-study networktopologies quantifies the spectrum savings achieved by employing EON overtraditional fixed-grid optical networks, and provides new insights on theimpact of bandwidth squeezing and multi-path provisioning on spectrumutilization.

Reliable Slicing of 5G Transport Networks with Dedicated Protection