Wireless Power Charging Control in Multiuser Broadband Networks

TL;DR

This paper introduces a novel wireless charging control method for multiuser broadband networks that optimizes power allocation using channel and battery information, significantly extending network lifetime and reducing energy costs.

Contribution

It proposes a multi-criteria charging control policy with a new CSI estimation mechanism, improving efficiency and sustainability of wireless power transfer in broadband networks.

Findings

Significantly increases network lifetime under power constraints.

Reduces energy cost of CSI and BSI feedback.

Achieves near-perpetual operation with lower transmit power.

Abstract

Recent advances in wireless power transfer (WPT) technology provide a cost-effective solution to charge wireless devices remotely without disruption to the use. In this paper, we propose an efficient wireless charging control method for exploiting the frequency diversity in multiuser broadband wireless networks, to reduce energy outage and keep the system operating in an efficient and sustainable state. In particular, we first analyze the impact of charging control method to the operating lifetime of a WPT-enabled broadband system. Based on the analysis, we then propose a multi-criteria charging control policy that optimizes the transmit power allocation over frequency by jointly considering the channel state information (CSI) and the battery state information (BSI) of wireless devices. For practical implementation, the proposed scheme is realized by a novel limited CSI estimation mechanism embedded with partial BSI, which significantly reduces the energy cost of CSI and BSI feedback. Simulation results show that the proposed method could significantly increase the network lifetime under stringent transmit power constraint. Reciprocally, it also consumes lower transmit power to achieve near-perpetual network operation than other single-criterion based charging control methods.