ORANUS: Latency-tailored Orchestration via Stochastic Network Calculus in 6G O-RAN Adamuz Hinojosa, Óscar Ramón Zanzi, Lanfranco Sciancalepore, Vincenzo García Saavedra, Andrés Costa Pérez, Xavier Multi-scale-time O-RAN Real-Time RIC Stochastic Network Calculus uRLLC The Open Radio Access Network (O-RAN)- compliant solutions lack crucial details to perform effective control loops at multiple time scales. In this vein, we propose ORANUS, an O-RAN-compliant mathematical framework to allocate radio resources to multiple ultra Reliable Low Latency Communication (uRLLC) services. In the near-RT control loop, ORANUS relies on a novel Stochastic Network Calculus (SNC)- based model to compute the amount of guaranteed radio resources for each uRLLC service. Unlike traditional approaches as queueing theory, the SNC-based model allows ORANUS to ensure the probability the packet transmission delay exceeds a budget, i.e., the violation probability, is below a target tolerance. ORANUS also utilizes an RT control loop to monitor service transmission queues, dynamically adjusting the guaranteed radio resources based on detected traffic anomalies. To the best of our knowledge, ORANUS is the first O-RAN-compliant solution which benefits from SNC to carry out near-RT and RT control loops. Simulation results show that ORANUS significantly improves over reference solutions, with an average violation probability 10× lower. 2024-11-18T11:55:07Z 2024-11-18T11:55:07Z 2024 journal article Adamuz Hijonosa, Ó.R. et. al. [ISSN: 0743-166X] issn: 0743-166X https://hdl.handle.net/10481/97015 eng info:eu-repo/grantAgreement/EC/H2020/101017109 http://creativecommons.org/licenses/by-nc-nd/4.0/ open access Attribution-NonCommercial-NoDerivatives 4.0 Internacional IEEE Institute of Electrical and Electronics Engineers