Method and device for controlling congestion in mobile communication system

A method performed by a second network entity in a wireless communication system, the method comprising:

• transmitting, to a first network entity for mobility management, a subscription request message for an event notification,
• wherein the subscription request message includes identification information for a target device and information for event reporting, and
• wherein the information for the event reporting includes periodic reporting along with a periodicity;
• receiving, from the first network entity, a subscription response message as a response to the subscription request message;
• and
• receiving, from the first network entity, an event notification message based on the information for the event reporting in case that an event for the target device occurs and an expiry timer is running,
• wherein the event for the target device occurs in case that the target device moves into or out of a target area.

A first network entity for mobility management in a wireless communication system, the first network entity comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• receive, from a second network entity, a subscription request message for an event notification, wherein the subscription request message includes identification information for a target device and information for event reporting, and wherein the information for the event reporting includes periodic reporting along with a periodicity,
• transmit, to the second network entity, a subscription response message as a response to the subscription request message, and
• transmit, to the second network entity, an event notification message based on the information for the event reporting in case that an event for the target device occurs and an expiry timer is running,
• wherein the event for the target device occurs in case that the target device moves into or out of a target area.

A second network entity in a wireless communication system, the second network entity comprising:

• a transceiver;
• and
• a controller coupled with the transceiver and configured to:
• transmit, to a first network entity for mobility management, a subscription request message for an event notification,
• wherein the subscription request message includes identification information for a target device and information for event reporting, and
• wherein the information for the event reporting includes periodic reporting along with a periodicity,
• receive, from the first network entity, a subscription response message as a response to the subscription request message, and
• receive, from the first network entity, an event notification message based on the information for the event reporting in case that an event for the target device occurs and an expiry timer is running,
• wherein the event for the target device occurs in case that the target device moves into or out of a target area.