3GPP 23.501 v20.2.0 — the document's own text
5.21.1.3 N2 TNL association selection
Taught in 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
The 5G-AN node shall consider the following factors for selecting a TNL association for the AMF for the initial N2 message e.g. N2 INITIAL UE MESSAGE:
- Availability of candidate TNL associations.
- Weight factors of candidate TNL associations.
The AMF may use any TNL association intended for non-UE associated signalling for initiation of the N2 Paging procedure.