Method and apparatus for controlling specific service in network congestion state in wireless communication system

A gateway in a communication system, the gateway comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a core network node, a downlink packet including header information, the header information including a value identifying an internet protocol (IP) multimedia subsystem (IMS) service,
• generate a downlink data notification message including paging policy information, the paging policy information including the value identifying the IMS service, and
• transmit, to a mobility management entity, the downlink data notification message,
• wherein the paging policy information indicates that the mobility management entity identifies a paging strategy for the IMS service based on the paging policy information, and
• wherein the paging strategy includes information on a retransmission associated with a paging.

A method performed by a mobility management entity in a communication system, the method comprising:

• receiving, from a gateway, a downlink data notification message for a downlink packet;
• identifying that the downlink data notification message includes paging policy information, the paging policy information including a value identifying an internet protocol (IP) multimedia subsystem (IMS) service;
• identifying a paging strategy for the IMS service based on the paging policy information, the paging strategy including information on a retransmission associated with a paging;
• and
• performing a procedure associated with the paging based on the paging strategy, wherein the value identifying the IMS service is included in header information of the downlink packet transmitted from a core network node to the gateway.

A mobility management entity in a communication system, the mobility management entity comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a gateway, a downlink data notification message for a downlink packet,
• identify that the downlink data notification message includes paging policy information, the paging policy information including a value identifying an internet protocol (IP) multimedia subsystem (IMS) service,
• identify a paging strategy for the IMS service based on the paging policy information, the paging strategy including information on a retransmission associated with a paging, and
• perform a procedure associated with the paging based on the paging strategy,
• wherein the value identifying the IMS service is included in header information of the downlink packet transmitted from a core network node to the gateway.