Section: 6.8.2.1 Security handling at transitions between RRC_INACTIVE and RRC_CONNECTED states 6.8.2.1.1 General
Content: In 5G, the RRC_INACTIVE state allows gNB/ng-eNB to suspend the UE's RRC connection while the gNB/ng-eNB and the UE continue to maintain the UE 5G AS security context. The UE RRC connection can be resumed at a later time by allowing the UE to transition into RRC__CONNECTED state. The UE may transition from RRC_INACTIVE state to RRC_CONNECTED state to the same last serving gNB/ng-eNB which sent the UE into RRC_INACTIVE state or to a different gNB/ng-eNB. While the UE is in RRC_INACTIVE state, the UE and last serving gNB/ng-eNB store the UE 5G AS security context which can be reactivated when the UE transitions from RRC_INACTIVE to RRC_CONNECTED. The gNB/ng-eNB and the UE shall behave as defined in following sub-clauses. The ng-eNB connected to 5GC shall also support the same security handling at RRC state transitions.