  Self-energy recycling (sER), which allows transmit energy re-utilization, has
emerged as a viable option for improving the energy efficiency (EE) in
low-power Internet of Things networks. In this work, we investigate its
benefits also in terms of reliability improvements and compare the performance
of full-duplex (FD) and half-duplex (HD) schemes when using multi-antenna
techniques in a communication system. We analyze the trade-offs when
considering not only the energy spent on transmission but also the circuitry
power consumption, thus making the analysis of much more practical interest. In
addition to the well known spectral efficiency improvements, results show that
FD also outperforms HD in terms of reliability. We show that sER introduces not
only benefits in EE matters but also some modifications on how to achieve
maximum reliability fairness between uplink and downlink transmissions, which
is the main goal in this work. In order to achieve this objective, we propose
the use of a dynamic FD scheme where the small base station (SBS) determines
the optimal allocation of antennas for transmission and reception. We show the
significant improvement gains of this strategy for the system outage
probability when compared to the simple HD and FD schemes.
