Embodiments contemplate wireless communication that may include sending machine type communication (MTC) application data from a services capability server (SCS) to an MTC user equipment (UE/WTRU) using a device trigger. The device trigger may be used to instruct an MTC device application to initiate communications with an SCS. Embodiments also contemplate that a first device trigger (DT) request may be received from a first wireless transmit/receive unit (WTRU) and a machine-type-communication inter-working function (MTC-IWF) may be determined in response to the first DT request. A second DT request may be sent to the MTC-IWF; and a first DT response may be received from the MTC-IWF. The first DT response may include a first information regarding a second WTRU.