1. 3GPP TS 22.261: Service requirements for the 5G system; Stage 1
2. 3GPP TS 23.273: 5G System (5GS) Location Services (LCS); Stage 2
3. 3GPP TS 38.305: Stage 2 functional specification of User Equipment (UE) positioning in NG-RAN
4. 3GPP TS 37.355: LTE Positioning Protocol (LPP)
5. 3GPP TS 38.455: NG-RAN; NR Positioning Protocol A (NRPPa)