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In the past few decades, optical transport networks (OTNs) have undergonesignificant evolution, from the earliest wavelength-division multiplexing (WDM)OTNs to elastic optical networks (EONs) and later to space-divisionmultiplexing (SDM) OTNs, to address the continuous growth of Internet traffic.By 2024, Pbps-level OTNs are expected, far exceeding the capacity limit ofsingle-mode fibers. The massive SDM era is on the horizon. In this context,newly designed OTNs called spatial channel networks (SCNs), which achieve highcost efficiency by means of practical hierarchical optical cross-connects, haverecently been proposed. However, the evolution of OTNs will simultaneouslypresent challenges related to resource allocation in networking. For instance,with the evolution from WDM-OTNs to EONs, the resource allocation problem wastransformed from the routing and wavelength assignment (RWA) problem to therouting and spectrum assignment (RSA) problem due to the additionallyintroduced constraint of spectrum contiguity. Similarly, specially designedalgorithms are also expected to be essential for addressing the resourceallocation problem in SCNs. In this paper, we define this new problem as therouting, spatial channel, and spectrum assignment (RSCSA) problem. We proposean integer linear programming (ILP) model and a heuristic algorithm to solvethe RSCSA problem. We examine the performance of the proposed approaches viasimulation experiments. The results show that both proposed approaches areeffective in finding the optimal solutions or solutions close to the lowerbounds. To the best of our knowledge, this is the first work to focus on theproblem of resource allocation in SCNs.

Multilayer Routing and Resource Assignment in Spatial Channel Networks (SCNs): Oriented Toward the Massive SDM Era