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5G networks will enable the creation of network slices to serve very different user requirements. Flex Ethernet (FlexE) is a standard technology that provides strict isolation between slices, also called hard slicing, by allocating capacity slots of physical links to slices. The resulting resource allocation problem is called Routing and Slot Allocation problem (RSA). We first prove that this problem is NP-hard and cannot be approximated. Then, we develop two matheuristics to efficiently solve the problem, by leveraging on a combination of Column Generation and Gauss Seidel procedures. The numerical evaluation, carried out by comparing the two matheuristics against a greedy algorithm over a realistic IP-RAN networks, shows an optimality gap smaller than 7%, while reducing the reservation cost by 4% compared to the greedy algorithm.

Routing and Slot Allocation in 5G Hard Slicing.