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

5.17.1.3 QoS handling for home routed roaming

Taught in 19. Living next to 4G (The 5G system architecture, in depth), 7. Roaming, other accesses, the edge and the outside (The 5G system architecture, overview).

During mobility from EPS to 5GS, the handling of QoS constraints in V-SMF is specified in clauses 4.11.1.2.2 and 4.11.1.3.3 of TS 23.502 [3] and follows the same principle as described in clause 5.7.1.11.