A clear trend shows that cells are smaller, more homogeneously distributed, higher frequency oriented, and more energy conscious. This points toward wireless systems that implement millimeter-wave modulation; therefore, improving its usability is essential for the communication systems evolution. The proposed bottom-layer solutions are (1) a variable slot time multiplexing access technique with an energy-conservation feature that supports self-sustainability, and (2) SC-FDMA as the technology implemented at the physical layer to minimize the peak-to-average-power ratio (PAPR) of the system. It is shown that the multiplexing protocol has advantages over TDMA, self-sustainability is feasible, and SC-FDMA reduces the PAPR of the modulated signal.