Low-Rate Machine-Type Communication via Wireless Device-to-Device (D2D) Links
Wireless cellular networks feature two emerging technological trends. The first is the direct Device-To-Device (D2D) communications, which enables direct links between the wireless devices that reutilize the cellular spectrum and radio interface. The second is that of Machine-Type Communications (MTC), where the objective is to attach a large number of lowrate low-power devices, termed Machine-Type Devices (MTDs) to the cellular network. MTDs pose new challenges to the cellular network, one if which is that the low transmission power can lead to outage problems for the cell-edge devices. Another issue imminent to MTC is the massive access that can lead to overload of the radio interface.