Resource Allocation Techniques for Wireless Powered Communication Networks with Energy Storage Constraint

TL;DR

This paper investigates resource allocation in multi-user wireless powered communication networks with energy storage constraints, proposing optimal strategies to maximize uplink sum rate in both infinite and finite storage scenarios.

Contribution

It introduces novel optimal resource allocation algorithms for both infinite and finite energy storage cases, improving sum rate performance in wireless powered networks.

Findings

Proposed algorithms achieve 30% higher sum rate than conventional schemes.

Derived optimal downlink energy transmission policy for infinite storage case.

Validated effectiveness of algorithms through simulations.

Abstract

This paper studies multi-user wireless powered communication networks, where energy constrained users charge their energy storages by scavenging energy of the radio frequency signals radiated from a hybrid access point (H-AP). The energy is then utilized for the users' uplink information transmission to the H-AP in time division multiple access mode. In this system, we aim to maximize the uplink sum rate performance by jointly optimizing energy and time resource allocation for multiple users in both infinite capacity and finite capacity energy storage cases. First, when the users are equipped with the infinite capacity energy storages, we derive the optimal downlink energy transmission policy at the H-AP. Based on this result, analytical resource allocation solutions are obtained. Next, we propose the optimal energy and time allocation algorithm for the case where each user has finite capacity energy storage. Simulation results confirm that the proposed algorithms offer 30% average sum rate performance gain over conventional schemes.