 continuity with another base station according to measurement reports from the UE. The handover mechanism is initiated from the source base station to a target base station. If the target base station does not have an Xn interface with the source base station, then the handover request is transmitted to the AMF via the Handover Required request. The AMF function requests the target base station to reserve radio resources to the mobile by the Handover Request. The target base station informs the AMF of the execution of the handover via the Handover Notify request. The completion of the handover is always finalized by a modification of the routing table of the UPF. The target base station sends the tunnel information via the PATH SWITCH REQUEST. When the mobile is in the RRC_INACTIVE state, the core network does not manage its mobility, the AMF function can nevertheless subscribe to a service allowing it to be notified when the terminal changes from the RRC_INACTIVE state to the RRC_CONNECTED state. 2.2.3.4. Notification procedures The notification procedure is initiated by the AMF function and aims to locate the mobile on an NG-RAN node. The AMF node knows the TAI location of the mobile and the value of the DRX (Discontinuous Reception) counter if this is activated. NG-RAN Network - Protocol Architecture When the mobile is in the CM IDLE state, the AMF function requests the NG-RAN nodes of the TAI zone of the mobile to broadcast a notification message (paging). In the event of base station congestion, the base station processes priority notifications. The priority is defined in an optional field of the PAGING message sent by the AMF to the gNB base station. 2.2.3.5. NAS message transport procedures UE can transmit data messages like SMS or small amounts of data for IoT terminals in a NAS request. For uplink transmission, the NG-RAN node transfers the message encapsulated in the RRC protocol to the AMF, via either the Initial UE Message for the first transmission or the Uplink NAS Transport message for subsequent 