Method for processing request message in wireless communication system and apparatus therefor

A first M2M (machine-to-machine) device configured to process a request message in a wireless communication system, the first M2M device comprising:

• a transceiver;
• and
• a processor that controls the transceiver,
• wherein the processor:
• receives the request message directly from an originator device,
• determines whether the originator device has been registered to the first M2M device,
• determines whether the request message is for handover setup when the originator device has not been registered to the first M2M device,
• when the request message is determined to be for handover setup:
• stores handover information included in the request message,
• updates registration information related to the originator device according to the handover information, and
• transmits a processing result regarding the request message to the originator device, and
• when the request message is determined to be not for handover setup:
• determines whether the first M2M device has handover information related to the originator device,
• updates registration information related to the originator device when the first M2M device has the handover information related to the originator device, and
• processes the request message,
• wherein the updating of the registration information includes storing handover state information including an ID of the first M2M device, a handover ID and a handover information ID in the registration information to update the registration information related to the originator device.