Section: 5.3.18 Restricted local operator services
Content: Restricted local operator services (RLOS) is an optional feature that enables operators to offer access to restricted local operator services to the unauthenticated UEs in limited service state (see 3GPP TS 23.401[ General Packet Radio Service (GPRS) enhancements for Evolved Universal Terrestrial Radio Access Network (E-UTRAN) access ]  [10]). Authenticated UEs in limited service state may also be able to access restricted local operator services. The UE requests access to RLOS during the attach procedure by setting the attach type to "EPS RLOS attach" in the ATTACH REQUEST message. Subject to regulation and local operator policy, if the MME is configured to support access to RLOS, the MME accepts the UE's attach request regardless of the authentication result or skips the authentication procedure. When the UE requests the lower layer to establish an RRC connection for access to RLOS, the UE indicates in the RRC signalling that the RRC connection is for access to RLOS to the lower layers. The UE supporting access to RLOS shall perform PLMN selection according to 3GPP TS 23.122[ Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode ]  [6]. Broadcast system information may provide information about support of access to RLOS (see 3GPP TS 36.331[ Evolved Universal Terrestrial Radio Access (E-UTRA); Radio Resource Control (RRC); Protocol specification ]  [22]). At reception of new broadcast system information, the lower layers deliver it to the EMM layer in the UE. The information provided by lower layers is per PLMN and used by the UE to determine whether the PLMN is configured to support access to RLOS. The UE shall not attempt to request access to RLOS if the PLMN does not support access to RLOS. NOTE: Only authorized applications on the UE are allowed to trigger the initiation of RLOS connection (see 3GPP TS 33.401[ 3GPP System Architecture Evolution (SAE); Security architecture ]  [19]). For UE attached for access to RLOS, only UE originated access to RLOS requests are supported. Mobile terminated access to RLOS request and network triggered service request are not allowed. The UE is not allowed to initiate UE requested PDN connectivity for any additional PDN connection. In addition, intersystem change to other RAT including GERAN and UTRAN and handover between 3GPP and non-3GPP accesses are not supported. Access to RLOS is applicable to the UEs in WB-S1 mode only. The UEs in NB-S1 mode shall not request access to RLOS. Location service does not apply to access to RLOS. If a UE attached for access to RLOS needs to initiate an emergency call, the UE shall first perform a local detach prior to initiating an attach procedure for emergency bearer services.