equest without response (Table 2.6). Elementary procedure - class 1 Request AMF Configuration Update AMF CONFIGURATION UPDATE RAN Configuration Update RAN CONFIGURATION UPDATE Handover Cancellation HANDOVER CANCEL Handover Preparation HANDOVER REQUIRED Handover Resource Allocation HANDOVER REQUEST Initial Context Setup INITIAL CONTEXT SETUP REQUEST NG Reset NG RESET NG Setup NG SETUP REQUEST Path Switch Request PATH SWITCH REQUEST PDU Session Resource Modify PDU SESSION RESOURCE MODIFY REQUEST PDU Session Resource Modify PDU SESSION RESOURCE MODIFY Indication INDICATION PDU Session Resource Release PDU SESSION RESOURCE RELEASE COMMAND PDU Session Resource Setup PDU SESSION RESOURCE SETUP REQUEST UE Context Modification UE CONTEXT MODIFICATION REQUEST UE Context Release UE CONTEXT RELEASE COMMAND Write-Replace Warning WRITE-REPLACE WARNING REQUEST PWS Cancel PWS CANCEL REQUEST UE Radio Capability Check UE RADIO CAPABILITY CHECK REQUEST Table 2.5. NG-AP elementary procedures - Class 1 NG-RAN and 5G-NR Elementary procedure - class 2 Downlink RAN Configuration Transfer Downlink RAN Status Transfer Downlink NAS Transport Error Indication Uplink RAN Configuration Transfer Uplink RAN Status Transfer Handover Notification Initial UE Message NAS Non-Delivery Indication Paging PDU Session Resource Notify Reroute NAS Request UE Context Release Request Uplink NAS Transport AMF Status Indication PWS Restart Indication PWS Failure Indication UE Radio Capability Info Indication RRC Inactive Transition Report Overload Start Overload Stop Table 2.6. NG-AP elementary procedures - Class 2 The procedures on the NG interface concern: - PDU session management procedures; - the procedures for managing the context of the UE; - the mobility procedures of the UE; - notification procedures (paging); - NAS message transport procedures; - global procedures which involve an NG-RAN node and a core network function. NG-RAN Network - Protocol Architecture 2.2.3.1. PDU session management procedures The procedures related to PDU sessions allow res