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In this article, we propose a novel formulation for the resource allocationproblem of a sliced and disaggregated Radio Access Network (RAN) and itstransport network. Our proposal assures an end-to-end delay bound for theUltra-Reliable and Low-Latency Communication (URLLC) use case while jointlyconsidering the number of admitted users, the transmission rate allocation perslice, the functional split of RAN nodes and the routing paths in the transportnetwork. We use deterministic network calculus theory to calculate delay alongthe transport network connecting disaggregated RANs deploying network functionsat the Radio Unit (RU), Distributed Unit (DU), and Central Unit (CU) nodes. Themaximum end-to-end delay is a constraint in the optimization-based formulationthat aims to maximize Mobile Network Operator (MNO) profit, considering a cashflow analysis to model revenue and operational costs using data from one of theworld's leading MNOs. The optimization model leverages a Flexible FunctionalSplit (FFS) approach to provide a new degree of freedom to the resourceallocation strategy. Simulation results reveal that, due to its non-linearnature, there is no trivial solution to the proposed optimization problemformulation. Our proposal guarantees a maximum delay for URLLC services whilesatisfying minimal bandwidth requirements for enhanced Mobile BroadBand (eMBB)services and maximizing the MNO's profit.

Optimal Resource Allocation with Delay Guarantees for Network Slicing in Disaggregated RAN