Joint Power and Time Allocation in Full-Duplex Wireless Powered Communication Networks

Yongbo Cheng,Yuchao Chang,Xiaobing Yuan,Pengcheng Fu,Baoqing Li

doi:10.1155/2016/4845865

Abstract

We consider a full-duplex wireless powered communication network (WPCN) with one hybrid access point (H-AP) and a set of distributed users, where downlink wireless energy broadcasting is employed at H-AP and at the same time, uplink wireless information transmission takes place at users in a time-division multiple access manner. We extend proportional fair scheduler to this category of network when dealing with "doubly near-far problem," where users far away from H-AP achieve low throughput but suffer from both low harvested energy and high data transmission power consumption. We jointly optimize power and time allocation for each user to achieve proportional fairness while controlling the energy consumption offset for network to a low level. By using optimization techniques, the optimal transmit power and transmission time for users are obtained via proposed algorithm. Simulation results confirm the positive effect on improving the fairness metric and reducing energy consumption offset for network.

Highlights

There has been upsurge of research interests in RF(Radio Frequency-) enabled wireless energy transfer (WET) technology, which is a promising solution to extend lifetime in energy-constrained wireless networks, such as wireless sensor networks and cellular networks [1,2,3]
The “doubly near-far problem” in FD wireless powered communication network (WPCN) is explained in detail. To overcome this near-far problem, we address the proportional fairness among users with considering minimizing energy consumption offset, which is the amount of energy consumption minus energy harvesting
We investigated the problem of optimal transmit power and time allocation for each user in the FD WPCN, which aims at achieving proportional fairness and energy efficiency

Summary

Introduction

There has been upsurge of research interests in RF(Radio Frequency-) enabled wireless energy transfer (WET) technology, which is a promising solution to extend lifetime in energy-constrained wireless networks, such as wireless sensor networks and cellular networks [1,2,3]. As one important application of RF-enabled WET, wireless powered communication network (WPCN) is a category of network where wireless devices are utilizing the energy harvested from RF signal to transmit/decode information to/from other devices [4]. To prolong the lifetime of these devices, energy harvesting is utilized to provide a feasible power s upply. Dedicated power transmitter is applied to meet the demand of quality constrained applications in wireless powered communication networks

Objectives

Results

Conclusion