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

4.4.4.1 Architecture to support Location Services

Taught in 21. Emergency calls, messages, voice and location (The 5G system architecture, in depth).

Location Service feature is optional and applicable to both regulatory services and commercial services in this Release of the specification. The non-roaming and roaming architecture to support Location Services are defined in clause 4.2 of TS 23.273 [87].