name: NCGI
full_form: New Cell Global Identifier
context: The NCIs of the cells served by a mobile IAB-DU configured by the OAM can be reconfigured by the F1-terminating IAB-donor-CU serving the mobile IAB-DU, in case of an NCI collision with cells of other gNB-DUs served by the IAB-donor-CU. The reconfiguration of NCI pertains to the reconfiguration of the cellLocalId part of the NCI, where the new cellLocalId(s) are based on a list of NCIs that has been configured on this F1-terminating IAB-donor-CU. The value change of cellLocalId(s) shall be indicated to the OAM system of the mobile IAB-DU following the NCI reconfiguration. The mobile IAB-DU can notify OAM about the reconfigured cellLocalId(s) using notifications specified in TS 28.532[ Management and orchestration; Generic management services ]  [33]. NOTE: This shall not affect the existing procedure of configuring NCGI of cells served by a stationary gNB-DU via the OAM.
description: The New Cell Global Identifier (NCGI) is an identifier used in cellular networks to uniquely identify cells. It is part of the cell's configuration and plays a crucial role in managing cell identities, especially in scenarios where cell identifiers may collide or need reconfiguration due to network changes or updates. The NCGI is specifically relevant in the context of Integrated Access and Backhaul (IAB) deployments, where it ensures that cells served by different gNB-DUs (gNodeBs Dual Connectivity User Equipment) can be uniquely identified and managed efficiently.
explanation: NCGI is classified as an Identifier because it serves as a unique label for identifying cells within the network. Its primary function is to provide a distinct identity to each cell, facilitating efficient management of cellular networks, especially in complex deployment scenarios involving multiple gNB-DUs and potential identifier collisions.
section_title: 8.9.15 IAB-donor-CU-based NR Cell Identity (NCI) (re-)configuration for mobile IAB cells
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