Patent ID: 8804621

Claim:
A data transmission method for at least one machine type communication (MTC) device constituting an MTC group, the method comprising: receiving an attach request from a MTC device; determining whether the attach request is a first attach request from the MTC group; and if it is determined that the attach request is a first attach request from the MTC group, establishing a downlink tunnel and an uplink tunnel to be used for data transmission and reception between a gateway (GW) and a base station using an MTC group identity, the establishing comprising: transmitting, by a mobility management entity, a session creation request message to the GW in response to the attach request from the MTC device and receiving a session creation response message from the GW; transmitting, by the mobility management entity, an initial context setup request message including the MTC group identity to the base station; and allocating, by the base station, an MTC group tunnel identity for downlink data transmission using the MTC group identity included in the initial context setup request message.