nsumption measurement report between the secondary node SN and master node MN; - request for the value of the SN PDCP sequence number made by the secondary node (SN) to the master node (MN) in order to associate this value with the media established at the SN. 2.2.1.3. Global procedures Global procedures allow: - establishment or deletion of the Xn connection. This procedure enables the exchange of configuration in order that two neighbor NG-RAN nodes can communicate on the Xn-C interface. The information transmitted relates to the list of AMF entities in the region concerned, the list of cells served by the node and security information; - updating the configuration of the nodes (e.g. updating the TAI lists); - deactivation of cells in the event of inactivity of a neighboring cell to reduce the carbon impact; 48 NG-RAN and 5G-NR - cell activation; error notification when an error is detected on a received message, a message for which there is no failure response; - re-initialization of a node. 2.2.2. F1 interface procedures F1 Application Protocol (F1AP) provides signaling services between a gNB-CU and a gNB-DU. There are two types of services, the services associated with a UE and the services associated with the F1 interface (not associated with a UE). The F1AP protocols consist of elementary procedures (EP) which can be of two types: - class 1: request with response (failure or success, see Table 2.3); - class 2: request without response (Table 2.4). Elementary procedure - class 1 Request Reset RESET F1 Setup F1 SETUP REQUEST gNB-DU Configuration Update GNB-DU CONFIGURATION UPDATE gNB-CU Configuration Update GNB-CU CONFIGURATION UPDATE UE Context Setup UE CONTEXT SETUP REQUEST UE Context Release (gNB-CU initiated) UE CONTEXT RELEASE COMMAND UE Context Modification (gNB-CU UE CONTEXT MODIFICATION initiated) REQUEST UE Context Modification Required (gNBDU UE CONTEXT MODIFICATION initiated) REQUIRED Xn Setup XN SETUP REQUEST Write-Replace Warning WRITE-REPLACE WARNING REQUEST PWS Cancel PWS CANCEL REQUEST GNB-DU