Apparatus and method for delivering short message service efficiently in wireless communication system

A method for supporting short message service (SMS) by a mobile station in a mobile communication system, the method comprising:

• transmitting, to a core network (CN) node, first information indicating that the mobile station requests SMS among circuit switched (CS) domain services;
• receiving, when SMS via the CN node is supported based on subscription data received by the CN node from a home subscriber server(HSS), second information indicating that SMS via packet switched (PS) domain is supported from the CN node;
• determining whether to perform a location update procedure via CS domain based on the second information;
• when SMS via PS domain is not supported based on the second information, performing the location update procedure for CS domain;
• and
• when SMS via PS domain is supported based on the second information, performing the location update procedure for PS domain.

A core network (CN) node for offering short message service (SMS) in a mobile communication system, the core network node comprising:

• a transceiver configured to receive and transmit a signal;
• and
• a controller configured to receive first information indicating that a mobile station requests SMS among circuit switched (CS) domain services from the mobile station;
• to transmit an update location message including second information indicating that the CN node supports SMS to home subscriber server (HSS);
• to receive subscription data, the subscription data including third information indicating whether SMS via the CN node is supported from the HSS,
• to transmit, when SMS via the CN is supported based on the third information, fourth information indicating that SMS via packet switched (PS) domain is supported to the mobile station;
• and
• to determine whether to perform a location update based on the third information.

A mobile station for supporting short message service (SMS) in a mobile communication system, the mobile station comprising:

• a transceiver configured to receive and transmit a signal;
• and
• a controller configured to transmit, to a core network (CN) node, first information indicating that the mobile station requests SMS among circuit switched (CS) domain services;
• to receive, when SMS via the CN node is supported based on subscription data received by the CN node from a home subscriber server(HSS), a second information indicating that SMS via packet switched (PS) domain is supported;
• to determine whether to perform a location update procedure via CS domain based on the second information;
• when SMS via PS domain is not supported based on the second information, to perform the location update procedure for CS domain;
• and
• when SMS via PS domain is supported based on the second information, to perform the location update procedure for PS domain.