Section: 8.9.5 Change of gNB-CU-UP
Content: Figure 8.9.5-1 shows the procedure used for the change of gNB-CU-UP within a gNB. Figure 8.9.5-1: Change of gNB-CU-UP 1. Change of gNB-CU-UP is triggered in gNB-CU-CP based on e.g., measurement report from the UE. 2-3. Bearer Context Setup procedure is performed as described in clause 8.9.2. 4. F1 UE Context Modification procedure is performed to change the UL TNL address information for F1-U for one or more bearers in the gNB-DU. 5-6. Bearer Context Modification procedure (gNB-CU-CP initiated) is performed to enable the gNB-CU-CP to retrieve the PDCP UL/DL status and to exchange data forwarding information for the bearer. 7-8. Bearer Context Modification procedure is performed as described in clause 8.9.2. 9. Data Forwarding may be performed from the source gNB-CU-UP to the target gNB-CU-UP. 10-12. PDU Session Resource Modify Indication procedure is performed to update the DL TNL address information for the NG-U towards the core network. 13-14. Bearer Context Release procedure (gNB-CU-CP initiated) is performed as described in clause 8.9.3.