Method for delivering notification message in M2M system and apparatus therefor

摘要

TECHNICAL FIELD The present invention relates to a method and a device for notifying a resource subscription in an M2M (Machine-to-Machine) system and an apparatus therefor, comprising detecting a change in a subscription target resource including a subscription resource as a child resource Generating a notification message including a value indicating an event category of the change according to second attribute information set in the subscription resource; generating a scheduling information and a scheduling information set in a scheduling resource for the M2M device, And determining reachability to the receiving device based on scheduling information set in a scheduling resource for the device, and in a case where it is determined that the receiving device is reachable by the scheduling information, When the notification message is immediately transmitted to the receiving device and it is determined that the receiving device can not be reached by the scheduling information, the notification message includes a value included in the first attribute information set in the subscription resource , And the processed notification message is transmitted to the receiving device after the receiving device is recovered to a reachable state and a device therefor.