Method and device for supporting voice service in wireless communication system

A Mobility Management Entity (MME) apparatus for use in a wireless communication system, the MME apparatus comprising:

• a transceiver module;
• and
• a processor,
• wherein the processor is configured to:
• transmit an update location request (ULR) message to a home subscriber server (HSS) by the MME, and
• transmit a Notify Request message including information about an update of a homogeneity of support of IP multimedia subsystem (IMS) voice over packet switched (PS) session, when the homogeneity of support of IMS voice over PS session is needed to be updated,
• wherein the Notify Request message includes a single radio voice call continuity (SRVCC) capability, when the MME determines that the SRVCC capability is changed, and
• wherein the ULR message includes a ‘Homogeneous Support of IP multimedia subsystem (IMS) Voice over packet switched (PS) Session’ information element, when the MME, having information including Voice over IMS related capability information of a user equipment (UE), completes an evaluation of the homogeneity of support of IMS voice over PS session.