Section: 5.5.1.2.4A Attach successful for EPS services and not accepted for SMS services
Content: Apart from the actions on the tracking area updating attempt counter, the description for attach for EPS services as specified in clause 5.5.1.2.4 shall be followed. In addition, the following description for attach for SMS services applies. In NB-S1 mode, if the UE requested "SMS only" in the Additional update type IE and supports NB-S1 mode only, the MME decides to accept the attach request for EPS services only and: - the location update for non-EPS services is not accepted by the VLR as specified in 3GPP TS 29.118[ Mobility Management Entity (MME) - Visitor Location Register (VLR) SGs interface specification ]  [16A]; or - the MME decides to not accept the attach request for "SMS only", the MME shall set the EPS attach result IE to "EPS only", shall not indicate "SMS only" in the Additional update result IE in the ATTACH ACCEPT message and shall include an appropriate SMS services status value. The UE receiving the ATTACH ACCEPT message takes one of the following actions depending on the value included in the SMS services status IE: "SMS services not available" The UE shall stop timer T3410 if still running, shall reset the tracking area updating attempt counter, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.NORMAL-SERVICE. The USIM shall be considered as invalid for SMS services until switching off or the UICC containing the USIM is removed or the timer T3245 expires as described in clause 5.3.7a. "SMS services not available in this PLMN" The UE shall stop timer T3410 if still running, shall reset the tracking area updating attempt counter, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.NORMAL-SERVICE. The UE may provide a notification to the user or the upper layers that the SMS services are not available. The UE shall not attempt normal attach or tracking area updating procedures indicating "SMS only" with current PLMN until switching off the UE or the UICC containing the USIM is removed. Additionally, the UE may perform a PLMN selection according to 3GPP TS 23.122[ Non-Access-Stratum (NAS) functions related to Mobile Station (MS) in idle mode ]  [6]. "Network failure" The UE shall stop timer T3410 if still running. The tracking area updating attempt counter shall be incremented, unless it was already set to 5. If the tracking area updating attempt counter is less than 5: - the UE shall start timer T3411, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.NORMAL-SERVICE. When timer T3411 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. If the tracking area updating attempt counter is equal to 5: - the UE shall start timer T3402, shall set the EPS update status to EU1 UPDATED and shall enter state EMM-REGISTERED.NORMAL-SERVICE. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. "Congestion" The UE shall stop the timer T3410 if still running. The tracking area updating attempt counter shall be set to 5. The UE shall start the timer T3402, shall set the EPS update status to EU1 UPDATED, and shall enter state EMM-REGISTERED.NORMAL-SERVICE. When timer T3402 expires the normal tracking area updating procedure for EPS services and "SMS only" or the combined tracking area updating procedure for EPS services and "SMS only" is triggered. Other values are considered as abnormal cases. The attach procedure shall be considered as failed for SMS services. The behaviour of the UE in those cases is specified in clause 5.5.1.2.6A.