Section: 4.13.3.7 MT SMS over NAS in CM-CONNECTED state via 3GPP access
Content: MT SMS in CM-CONNECTED procedure is specified by reusing the MT SMS in CM-IDLE state with the following modification: - There is no need for the AMF to perform Paging of the UE and can immediate continue with a message to SMSF via N20 to allow the SMSF to start forward the MT SMS. - If the delivery of the NAS PDU containing the SMS fails e.g. if the UE is in RRC_INACTIVE and NG-RAN paging was not successful, the NG-RAN initiate the UE context release in the AN procedure and provide notification of non-delivery to the AMF. The AMF provides an indication of non-delivery to the SMSF.