3GPP 23.501 v20.2.0 — the document's own text

5.35.4 Mobility support with IAB

Taught in 26. Relays, satellites, femtos and shared networks (The 5G system architecture, in depth).

For UEs, all existing NR intra-RAT mobility and dual-connectivity procedures are supported when the UE is served by an IAB-node except for the cases of NR satellite access. For a UE served by an IAB-node when the serving IAB-node changes its IAB-donor-CU due to mobility, the mobility support is specified in clause 5.35A.1 and clause 5.35A.3.