Section: 5.6.1.2.1 UE is not using EPS services with control plane CIoT EPS optimization
Content: For cases a, b, c, h, k, l and o in clause 5.6.1.1: - if the UE is not configured for NAS signalling low priority, the UE initiates the service request procedure by sending a SERVICE REQUEST message to the MME; - if the UE is configured for NAS signalling low priority, and the last received ATTACH ACCEPT message or TRACKING AREA UPDATE ACCEPT message from the network indicated that the network supports use of EXTENDED SERVICE REQUEST for packet services, the UE shall send an EXTENDED SERVICE REQUEST message with service type set to "packet services via S1"; or NOTE: A UE configured for dual priority is configured for NAS signalling low priority indicator. - if the UE is configured for NAS signalling low priority and the last received ATTACH ACCEPT message or TRACKING AREA UPDATE ACCEPT message from the network did not indicate that the network supports use of EXTENDED SERVICE REQUEST for packet services, the UE shall instead send a SERVICE REQUEST message. For cases a, b, c, h, k, l, and o in clause 5.6.1.1, after sending the SERVICE REQUEST message or the EXTENDED SERVICE REQUEST message with service type set to "packet services via S1", the UE shall start T3417 and enter the state EMM-SERVICE-REQUEST-INITIATED. For case d in clause 5.6.1.1, the UE shall send an EXTENDED SERVICE REQUEST message, start T3417ext and enter the state EMM-SERVICE-REQUEST-INITIATED. For case e in clause 5.6.1.1: - if the UE is in EMM-IDLE mode, the UE shall send an EXTENDED SERVICE REQUEST message, start T3417ext-mt and enter the state EMM-SERVICE-REQUEST-INITIATED; - if the UE is in EMM-CONNECTED mode and if the UE accepts the paging, the UE shall send an EXTENDED SERVICE REQUEST message with the CSFB response IE indicating "CS fallback accepted by the UE", start T3417ext-mt and enter the state EMM-SERVICE-REQUEST-INITIATED; or - if the UE is in EMM-CONNECTED mode and if the UE rejects the paging, the UE shall send an EXTENDED SERVICE REQUEST message with the CSFB response IE indicating "CS fallback rejected by the UE" and enter the state EMM-REGISTERED.NORMAL-SERVICE. The network shall not initiate CS fallback procedures. For cases f, g, i and j in clause 5.6.1.1, the UE shall send an EXTENDED SERVICE REQUEST message, start T3417 and enter the state EMM-SERVICE-REQUEST-INITIATED. For case o in clause 5.6.1.1, the UE may send an EXTENDED SERVICE REQUEST message with Service type set to "packet services via S1" and Request type set to "NAS signalling connection release" in the UE request type IE to remove the paging restriction and request the release of the NAS signalling connection at the same time. The UE shall start T3417 and enter the state EMM-SERVICE-REQUEST-INITIATED. The UE shall not include the Paging restriction IE in the EXTENDED SERVICE REQUEST message. For cases p and q in clause 5.6.1.1, the UE shall send an EXTENDED SERVICE REQUEST message, 1) for case p in clause 5.6.1.1, set Request type to "NAS signalling connection release" in the UE request type IE and Service type to "packet services via S1"; or 2) for case q in clause 5.6.1.1, set Request type to "Rejection of paging" in the UE request type IE and, a) if the UE needs to reject PS paging, the UE shall set Service type to "packet services via S1"; or b) if the UE needs to reject CS paging, the UE shall set Service type to "mobile terminating CS fallback or 1xCS fallback" and the CSFB response IE to "CS fallback rejected by the UE"; and start T3417, enter the state EMM-SERVICE-REQUEST-INITIATED and may include its paging restriction preference in the Paging restriction IE in the EXTENDED SERVICE REQUEST message.