3GPP 23.501 v20.2.0 — the document's own text
5.19.2 TNLA Load Balancing and TNLA Load Re-Balancing
Taught in 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
AMF can support load balancing and re-balancing of TNL associations between 5G-AN and AMF by using mechanisms specified in clause 5.21.1.