Transmission Delay Minimization in Wireless Powered Communication Systems

TL;DR

This paper investigates minimizing transmission delay in wireless powered communication systems by optimizing energy transfer and data transmission times, extending the analysis from single-user to multi-user scenarios.

Contribution

It introduces four optimization problems for delay minimization in a point-to-point WPC system and extends the analysis to multiuser cases with two different optimization approaches.

Findings

Optimal DL and UL durations reduce delay significantly.

Multiuser extension demonstrates scalability of the optimization methods.

Comparison of optimization strategies highlights trade-offs in system performance.

Abstract

We study transmission delay minimization of a wireless powered communication (WPC) system in a point-to-point scenario with one hybrid access point (HAP) and one WPC node. In this type of communications, the HAP sends energy to the node at the downlink (DL) for a given time duration and the WPC node harvests enough radio frequency (RF) power. Then, at the uplink (UL) channel, the WPC node transmits its collected data in a given time duration to the HAP. Minimizing such round trip delay is our concern here. So, we have defined four optimization problems to minimize this delay by applying the optimal DL and UL time durations and also the optimal power at the HAP. These optimization problems are investigated here with thorough comparison of the obtained results. After that, we extend our study to the multiuser case with one HAP and $K$ nodes and two different optimization problems are studied again in these cases.