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

5.35A.3.2 UE mobility between MBSR cells

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

Similar to the behaviours described in clause 5.35A.3.1, UEs and NG-RAN use existing procedures as specified in clause 8.23 of TS 38.401 [42], TS 23.502 [3], or TS 38.304 [50] to handle the mobility between MBSR cells.