Abstract
Centralized controls in wireless powered communication networks may induce considerable signaling overhead for channel estimation and high complexity for optimization in proportion to the number of wireless devices (WDs). To address this issue, we propose a distributed energy-harvesting random access protocol based on slotted ALOHA for wireless powered dense networks (WPDNs). The proposed harvest-until-access protocol enables the WDs to continuously harvest energy until they access a slot from the beginning of the frame and then transmit data at the selected random access (RA) slot by using the harvested energy. Through an asymptotic analysis in the high signal-to-noise ratio (SNR) environment with a sufficient number of accessing WDs, we show that there is an optimal number of RA slots that maximizes the average channel throughput and it depends only on the average of the minimum SNRs of the WDs without knowledge of full channel state information. Simulation results also show that the proposed harvest-until-access protocol outperforms the conventional harvest-then-transmit-based random access protocols especially when the number of WDs is large.
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