A Mobility Management Entity (MME) having MSC functionality implemented therein, performs a scheme of MTC device triggering has been conceived. A PS and CS combined location update is sent to the HSS/HLR by means of piggybacking of CS domain information over an interface between the MME and the HSS/HLR as part of a “combined” EPS/IMSI attach procedure or a “combined” TA/LA update procedure. The, SMS signaling is received from an SMS-SC (GMSC/IWMSC) to transfer an SMS message for an LTE-only device or a single-mode E-UTRAN device. Here, the SMS signaling is received from the SMS-SC (GMSC/IWMSC) via an interworking function (IWF) that provides interworking between a MAP interface and a Diameter interface. As a result, M2M or MTC devices can be supported for an LTE network or the like.