3GPP 23.501 v20.2.0 — the document's own text
5.12.1 General
Taught in 15. Rules, and paying for them (The 5G system architecture, in depth), 6. One network behaving like several (The 5G system architecture, overview).
5GC supports interactions towards CHF for network resource usage, as defined in TS 32.240 [41]. The CHF and the Nchf service are defined in TS 32.290 [67].
The SMF supports the interactions towards the CHF, as defined in TS 32.255 [68]. The UPF supports functionality to collect and report usage data to SMF. The N4 reference point supports the SMF control of the UPF collection and reporting of usage data.
The AMF supports interactions towards the CHF, as defined in TS 32.256 [114].
The SMSF supports interactions towards the CHF, as defined in TS 32.274 [118].
The NEF supports interactions towards the CHF, as defined in TS 32.254 [123].