Section: 5.5.1.2 Attach procedure for EPS services 5.5.1.2.1 General
Content: This procedure can be used by a UE to attach for: - EPS services only; or - EPS services and "SMS only" if the UE supports NB-S1 mode only. When the UE initiates the attach procedure for normal service, the UE shall indicate "EPS attach" in the EPS attach type IE. When the UE initiates the attach procedure for emergency bearer services, the UE shall indicate "EPS emergency attach" in the EPS attach type IE. The attach procedure for emergency bearer services is not applicable for NB-S1 mode (see 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [10]). This procedure can also be used by a UE in limited service state to attach for access to RLOS. When the UE initiates the attach procedure for access to RLOS, the UE shall indicate "EPS RLOS attach" in the EPS attach type IE. The attach procedure for access to RLOS is not applicable for NB-S1 mode (see 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [10]).