Section: 9.2.2.3 RAN-Based Notification Area
Content: A UE in the RRC_INACTIVE state can be configured by the last serving NG-RAN node with an RNA, where: - the RNA can cover a single or multiple cells, and shall be contained within the CN registration area; in this release Xn connectivity should be available within the RNA; - a RAN-based notification area update (RNAU) is periodically sent by the UE and is also sent when the cell reselection procedure of the UE selects a cell that does not belong to the configured RNA. There are several different alternatives on how the RNA can be configured: - List of cells: - A UE is provided an explicit list of cells (one or more) that constitute the RNA. - List of RAN areas: - A UE is provided (at least one) RAN area ID, where a RAN area is a subset of a CN Tracking Area or equal to a CN Tracking Area. A RAN area is specified by one RAN area ID, which consists of a TAC and optionally a RAN area Code; - A cell broadcasts one or, in case of network sharing with multiple cell ID broadcast, more RAN area IDs in the system information. NG-RAN may provide different RNA definitions to different UEs but not mix different definitions to the same UE at the same time. UE shall support all RNA configuration options listed above.