name: PCI
full_form: Physical Cell Identity as used in TS 36.331 [21]
context: gNB, the OAM assigns a list of PCIs for each NR cell in the gNB, and the gNB selects a PCI value from the list of PCIs. The gNB may restrict this list by removing some PCIs that are reported by UEs, reported over the Xn interface by neighboring gNBs, and/or acquired through other methods, e.g. detected over the air using a downlink receiver. The PCI Optimization Function in split gNB case, 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 confilict 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
description: Physical Cell Identity (PCI) is a critical network attribute used in the identification of cells within a network, specifically in the context of New Radio (NR) and E-UTRA-NR Dual Connectivity (EN-DC). It is utilized by gNBs to select a unique identity for each cell, ensuring proper communication and minimizing conflicts.
explanation: The provided text describes PCI as a value assigned to cells by gNBs for identification purposes. This aligns with the definition of a Parameter in telecommunications, which encompasses network attributes like identifiers used for configuration and operation.
section_title: 9.4.1	Enhancement of data collection for SON/MDT in NR and EN-DC
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