Method and apparatus for packet-switched service handover in wireless communication system

A method of performing a handover of a PS (packet switched) service in a user equipment of a wireless communication system, the method comprising:

• receiving a handover policy information from a network node;
• and
• determining whether to perform the handover of the PS service based on the handover policy information without suspending the PS service,
• wherein the handover policy information includes an information indicating an event for performing the handover of the PS service and a target access technology of the handover of the PS service,
• wherein the target access technology is set to a value indicating a non-3 GPP access technology,
• wherein the event is set to a value indicating a CS (circuit switched) call request, and
• wherein the determining whether to perform the handover of the PS service is performed before a CSFB (circuit switched fall back) is performed after occurrence of a request for a voice call.