Digital cellular telecommunications system (Phase 2+); Universal Mobile Telecommunications System (UMTS); LTE; Service accessibility (V12.3.0; 3GPP TS 22.011 version 12.3.0 Release 12)
The purpose of this TS is to describe the service access procedures as presented to the user. Definitions and procedures are provided in this TS for international roaming@ national roaming and regionally provided service. These are mandatory in relation to the technical realization of the Mobile Station (UE).