 RESOURCE COORDINATION GNB-DU RESOURCE COORDINATION REQUEST Table 2.3. F1 elementary procedures - Class 1 NG-RAN Network - Protocol Architecture Elementary procedure - class 2 Error Indication UE Context Release Request (gNBDU initiated) Initial UL RRC Message Transfer DL RRC Message Transfer UL RRC Message Transfer UE Inactivity Notification System Information Delivery Paging Notify PWS Restart Indication PWS Failure Indication Table 2.4. F1 elementary procedures - Class 2 The procedures on the F1 interface concern: - F1 interface management procedures; - management procedures of the UE context; - RRC message transfer procedures; - paging procedures; - information system broadcasting. 2.2.2.1. The F1 interface management procedure The reset procedure is used to initialize or re-initialize the UE contexts following a failure of the gNB-DU or the gNB-CU. 2.2.2.2. Dual connectivity The objectives of dual connectivity procedures are to add, modify and release the resources of the secondary base station: - adding a context to the secondary base station SN initiated by the master base station MN; - release the UE context at the secondary base station SN. This request is initiated by the master base station MN; NG-RAN and 5G-NR - UE context updating; - RRC message transfer between the MN entity and the terminal via the SN (Split Bearer) entity; - transfer of activity notifications in order to inform the master node (MN) in real time of the user plane resources that are used at the secondary station (SN); - transfer of the data consumption measurement report between the secondary node and the master node; - request for the value of the SN PDCP sequence number made by the secondary node to the master node in order to associate this value with the media established at the secondary SN node. 2.2.2.3. Global procedures Global procedures allow: - establishment or release of the Xn interface. This procedure enables the exchange of configuration information SO that two neighbor NG-RAN nodes can communicate on the Xn-C interfac