Patent ID: 11102625

Abstract:
An embodiment of the present invention pertains to a method for a home subscriber server (HSS)+user data management (UDM) supporting a mobile terminated (MT) short message (SM) service for a UE that is registered to both of an evolved packet core (EPC) and a 5G core network (5GC) in a wireless communication system, the method comprising the steps of: the HSS+UDM receiving information for MT SM routing from an access and mobility management function (AMF) and a mobility management entity (MME); determining a priority regarding which one of an SMSF connected to the AMF and the MME an MT SM would be transmitted to first, based on the information; and transmitting routing information including the determined priority to an SMS-related node, wherein the HSS+UDM may determine the priority according to whether a UE to receive the MT SM is in a state of being connected to 5GC or EPC.