3GPP 23.501 v20.2.0 — the document's own text
5.51.2.3 Energy Consumption information calculation
Taught in 27. Overload, energy, deployment and the rest (The 5G system architecture, in depth).
EIF calculates the Energy Consumption information of the required granularities (UE, S-NSSAI, PDU Session and/or Service Data Flow), based on input parameters from Tables 5.51.2.2.2-2 and 5.51.2.2.3-1 and gets the results. The formulas for the calculation are left to implementation and which formulas are used is left to operator policy, some examples of formulas to support the above calculation are described in Annex T.