Section: 7.8 PCI Optimisation Function
Content: The PCI Optimization Function in non-split gNB case is specified in TS 38.300[ NR; NR and NG-RAN Overall description; Stage-2 ]  [2]. In split gNB architecture, the OAM configures a PCI for each NR cell to the gNB-DU. For centralized PCI assignment in split gNB architecture, the gNB-CU detects PCI conflict of NR cells and reports the NR cells suffering PCI conflict to OAM directly. The OAM is in charge of reassigning a new PCI for the NR cell subject to PCI conflict. For distributed PCI assignment in split gNB architecture, the OAM assigns a list of PCIs for each NR cell and sends the configured PCI list to the gNB-CU. If the gNB-CU detects PCI conflict, the gNB-CU may select a new PCI value from the preconfigured PCI list for the NR cell and send it to the gNB-DU by either F1 Setup procedure or gNB-CU configuration update procedure.