Method and system for monitoring event handling of end devices

A network device comprising:

• a processor configured to:
• subscribe, with an other network device of a stand-alone core network responsive to a non-stand-alone registration procedure between an end device and the network device, for when the end device is in a stand-alone registered status in the stand-alone core network, wherein the network device is a home subscriber server of a non-stand-alone core network and the other network device includes a unified data management device;
• receive, after the subscribing via the non-stand-alone core network, a monitoring event request pertaining to the end device;
• subscribe, with the other network device, to a monitoring event service for the monitoring event request;
• receive, from the other network device, a message indicating an occurrence of an event pertaining to the monitoring event request;
• and
• transmit, via the non-stand-alone core network, a notification message.

A non-transitory computer-readable storage medium storing instructions executable by a processor of a home subscriber server of a non-stand-alone core network, wherein the instructions are configured to:

• subscribe, with an other network device of a stand-alone core network responsive to a non-stand-alone registration procedure between an end device and the home subscriber server, for when the end device is in a stand-alone registered status in the stand-alone core network, wherein the other network device is unified data management device;
• receive, after the subscribing via the non-stand-alone core network, a monitoring event request pertaining to the end device;
• subscribe, with the other network device, to a monitoring event service for the monitoring event request;
• receive, from the other network device, a message indicating an occurrence of an event pertaining to the monitoring event request;
• and
• transmit, via the non-stand-alone core network, a notification message.