Self-energy recycling for low-power reliable networks: Half-duplex or Full-duplex?

TL;DR

This paper explores self-energy recycling in low-power IoT networks, demonstrating that full-duplex schemes with dynamic antenna allocation significantly enhance reliability and energy efficiency over half-duplex systems.

Contribution

It introduces a dynamic full-duplex scheme with antenna allocation for improved reliability and energy efficiency in self-energy recycling IoT networks.

Findings

Full-duplex outperforms half-duplex in reliability and spectral efficiency.

Self-energy recycling benefits include improved energy efficiency and reliability.

Dynamic antenna allocation significantly reduces outage probability.

Abstract

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.