ETSI TS 123122 V 16.11.0,3GPP TS 23.122 Version 16
Digital cellular telecommunications system (Phase 2+) (GSM) - Universal Mobile Telecommunications System (UMTS) - LTE - 5G - Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode (3GPP TS 23.122 version 16.11.0 Release 16)