Uplink Time Scheduling with Power Level Modulation in Wireless Powered Communication Networks

TL;DR

This paper introduces a novel downlink signal design using power level modulation for wireless powered communication networks, enabling dynamic uplink scheduling and improving overall throughput.

Contribution

It proposes a new downlink signal design scheme with power level modulation for uplink scheduling in WPCNs, optimizing throughput through convex programming.

Findings

Proposed scheme outperforms conventional methods in throughput.

Power level modulation effectively conveys uplink scheduling information.

Optimized time allocation enhances network performance.

Abstract

In this paper, we propose downlink signal design and optimal uplink scheduling for the wireless powered communication networks (WPCNs). Prior works give attention to resource allocation in a static channel because users are equipped with only energy receiver and users cannot update varying uplink schedulling. For uplink scheduling, we propose a downlink signal design scheme, called a power level modulation, which conveys uplink scheduling information to users. First, we design a downlink energy signal using power level modulation. Hybrid-access point (H-AP) allocates different power level in each subslot of the downlink energy signal according to channel condition and users optimize their uplink time subslots for signal transmission based on the power levels of their received signals. Further, we formulate the sum throughput maximization problem for the proposed scheme by determining the uplink and downlink time allocation using convex optimization problem. Numerical results confirm that the throughput of the proposed scheme outperforms that of the conventional schemes.