Section: 8.23.2 Migration of mobile IAB-MT via NG handover
Content: The mobile IAB-MT can be migrated from a source RRC-terminating IAB-donor-CU to a target RRC-terminating IAB-donor-CU using the NG handover procedure. During this migration, the mobile IAB-DU co-located with the mobile IAB-MT is connected to an F1-terminating IAB-donor-CU, which may be the same as the source RRC-terminating IAB-donor-CU or the target RRC-terminating IAB-donor-CU, or it can be different from both the source and the target RRC-terminating IAB-donor-CU. Figure 8.23.2-1 shows an example of mobile IAB-MT migration via NG handover. In this example, the mobile IAB-MT is connected to the source RRC-terminating IAB-donor-CU via a source path of an IAB topology before the migration, and it is connected to the target RRC-terminating IAB-donor-CU via a target path of a different IAB topology after the migration. Figure 8.23.2-1: Procedure for NG-based migration of mobile IAB-MT 1. Similar to Step 1-14 in clause 8.17.3.1, where the NG-based handover procedure as defined in clauses 4.9.1.3.2 and 4.9.1.3.3 in TS 23.502[ Procedures for the 5G System (5GS) ]  [32] is used instead of Xn-based handover procedure. 2. Same as step 2 to step 4 in clause 8.23.1. NOTE How to perform the IAB Transport Migration Management/Modification procedures and the IAB Resource Coordination procedure between the F1-terminating IAB-donor-CU and the target RRC-terminating IAB-donor-CU without Xn interface is up to implementation.