Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Requirements on 3GPP system to Wireless Local Area Network (WLAN) interworking (V13.0.0; 3GPP TS 22.234 version 13.0.0 Release 13)
The present document specifies the functional requirements placed on the 3GPP system for interworking WLAN with the 3GPP system. Guidance is given for WLAN operators intending to provide the interworked WLAN capability. Maintenance of the I-WLAN feature is discontinued as of Release 12. No further changes to this specification are intended. If any future evolution of the procedures in this specification is necessary@ it should be documented in other specifications