Embodiments of an Evolved Node-B (eNB), a MulteFire narrowband internet-of-things User Equipment (MF NB-IoT UE), and methods of communication are described herein. The eNB may transmit an unlicensed narrowband primary synchronization signal (U-NPSS) in a plurality of subframes. The eNB may, for the U-NPSS, for each subframe of the plurality of subframes, and for each of the orthogonal frequency division multiplexing (OFDM) symbols of the subframe: repeat a sequence of length-11; and map the sequence to 11 resource elements (REs) of a physical resource block (PRB) of 12 REs. The eNB may process the U-NPSS by an orthogonal cover code (OCC) over the plurality of subframes. The sequence in each of the OFDM symbols of each of the subframes of the plurality of subframes may be multiplied by a different element of the OCC.