Section: 8.14.1.1 Signalling of RLF information from gNB-CU to gNB-DU
Content: The signalling flow for signalling of RLF information from gNB-CU to gNB-DU is shown in Figure 8.14.1.1-1, where the example where NG-RAN nodes exchange the RLF Report via the Xn: FAILURE INDICATION message has been considered. Figure 8.14.1.1-1 Example of signalling of RLF information from gNB-CU to gNB-DU in NG RAN 1. A UE with a logged RLF Report connects to a cell in gNB2 and it signals the RLF Report to gNB2 by means of the RRC UE Information Request/Response procedures. 2. The gNB2 sends an Xn: Failure Indication to gNB1-CU where the UE may have previously been connected prior to the connection failure. This includes also the RLF Report. 3. The gNB1-CU sends the F1: Access and Mobility Indication message to the gNB1-DU, including the RLF Report. It is also possible for the gNB-CU receiving the RLF Report from the UE to signal it directly to the gNB-DU by means of the F1: Access and Mobility Indication procedure.