C-HTT for Throughput Maximization in Time-Varying RF-Powered Systems

RF energy harvesting offers a promising solution for addressing energy limitations in wireless devices, particularly in IoT and sensor networks, by enabling autonomous operation and reducing reliance on batteries. However, the power of RF signals can fluctuate due to channel fading, interference, and mobility, posing challenges for energy harvesting and data transmission. In multi-device scenarios, competition for limited RF energy resources exacerbates these challenges. To address this, the Cooperative Harvest-then-Transmit (C-HTT) method is proposed, allowing devices to cooperate in energy harvesting and data transmission. By sharing RF power information and coordinating schedules, devices can optimize energy use, avoid interference, and ensure fairness. The C-HTT method involves four steps: initialization, energy harvesting, data transmission, and cooperation, where devices adjust their schedules based on shared RF power conditions. Simulations comparing C-HTT to time-sharing and random access methods show significant improvements in throughput, energy efficiency, and fairness in multi-device, time-varying RF-powered systems.