Method and device for cancelling device trigger in wireless communication system

1. A method for cancelling a device trigger in a wireless communication system, the method comprising the steps of:

receiving, from a services capability service/application server (SCS/AS), a cancellation request of a first trigger message in a network node;

checking whether the first trigger message has been transmitted to a user equipment or is pending in the network node; and

transmitting a second trigger message to the user equipment if the cancellation request indicates a replace request,

wherein if the first trigger message has been transmitted to the user equipment, the second trigger message includes cancellation information,

wherein if the transmission of the first trigger message from the network node to the user equipment is canceled by the network node based on the cancellation request of the first trigger message from the SCS/AS or if the first trigger message is pending in the network node, the second trigger message does not include cancellation information, and

wherein the cancellation information indicates that operation of the first trigger message has been canceled by the cancellation request of the SCS/AS.

2. The method according to claim 1 , wherein an operation to be performed by the user equipment in accordance with cancellation of the first trigger message includes one or more of cancellation of a task or reserved task based on the first trigger message, cancellation of connection to a network based on the first trigger message, and cancellation of data transmission to a network based on the first trigger message.

3. The method according to claim 1 , wherein the second trigger message is transmitted to the user equipment in the case that the first trigger message is successfully delivered to the user equipment, the first trigger message is transmitted to the user equipment regardless of successful delivery of the first trigger message to the user equipment, or the first trigger message is successfully delivered to the user equipment or the network node does not know whether the first trigger message has been transmitted to the user equipment but successfully delivered to the user equipment.

4. The method according to claim 1 , wherein, if the first trigger message has been transmitted to the user equipment and the cancellation request indicates a recall request, only the cancellation information is transmitted to the user equipment, and includes information indicating that cancellation of the first trigger message has been requested.

5. The method according to claim 4 , wherein the cancellation information further includes information indicating an operation to be performed by the user equipment in accordance with cancellation of the first trigger message.

6. The method according to claim 5 , wherein the operation to be performed by the user equipment in accordance with cancellation of the first trigger message includes one or more of cancellation of a task or reserved task based on the first trigger message, cancellation of connection to a network based on the first trigger message, and cancellation of data transmission to a network based on the first trigger message.

7. The method according to claim 4 , wherein the cancellation information message is transmitted to the user equipment in the case that the first trigger message is successfully delivered to the user equipment, the first trigger message is transmitted to the user equipment regardless of successful delivery of the first trigger message to the user equipment, or the first trigger message is successfully delivered to the user equipment or the network node does not know whether the first trigger message has been transmitted to the user equipment but successfully delivered to the user equipment.

8. The method according to claim 1 , wherein, if the first trigger message is pending in the network node or has been transmitted to the user equipment but not delivered to the user equipment successfully and the cancellation request indicates the replace request, the cancellation request is considered as success and a new trigger message is transmitted to the user equipment.

9. The method according to claim 1 , wherein, if the first trigger message is pending in the network node or has been transmitted to the user equipment but not delivered to the user equipment successfully and the cancellation request indicates the recall request, the cancellation request is considered as success.

10. The method according to claim 1 , wherein the network node is a machine type communication-interworking function (MTC-IWF) or a short message service-service center (SMS-SC).

11. A network node device for cancelling a device trigger in a wireless communication system, the network node device comprising:

a transceiver; and

a processor,

wherein the processor is configured to:

control the transceiver to receive, from a services capability service/application server (SCS/AS), a cancellation request of a first trigger message,

check whether the first trigger message has been transmitted to a user equipment or is pending in the network node, and

control the transceiver to transmit a second trigger message to the user equipment if the cancellation request indicates a replace request,

wherein if the first trigger message has been transmitted to the user equipment, the second trigger message includes cancellation information,

wherein if the transmission of the first trigger message from the network node to the user equipment is canceled by the network node based on the cancellation request of the first trigger message from the SCS/AS or if the first trigger message is pending in the network node, the second trigger message does not include cancellation information, and

wherein the cancellation information indicates that operation of the first trigger message has been canceled by the cancellation request of the SCS/AS.