Patent ID: 9014107
Filing Date: 2015-04-21
Classification: H04W

Abstract:
1. A data transmission method for a detached machine type communication (MTC) device in a mobile communication network including at least one MTC device, the method comprising: sensing a MTC device performing a detachment procedure from the network; when the MTC device being detached is sensed, storing, at a first gateway (GW), context information about the MTC device being detached from the network, wherein the detached MTC device is not registered in the network and is unable to receive downlink (DL) data transmissions; storing, at the detached MTC device, context information that has been lastly allocated and used before the detachment; receiving, at the first GW, DL data transmitted from a MTC server to the detached MTC device, and buffering received data; transmitting, at the first GW receiving the DL data transmitted to the detached MTC device, a DL data notification message to a mobility management entity (MME), wherein the MME uses information about at least one of a location area lastly registered before the MTC device switched to a detached state, a list of location areas permitted to the MTC device, and at least one location area which the MTC device has moved to most recently and registered, as a location of the MTC device for paging, transmitting a paging message to the detached MTC device; and performing, at the MTC device receiving the paging message, an attachment process to the network, and receiving the DL data that has been buffered in the first GW.