Wireless Powered Buffer-Aided Communication Over K-User Interference Channel

• Published in: 2018 IEEE 88th Vehicular Technology Conference (VTC-Fall) pp. 1 - 6
• Main Authors: Lan, Xiaolong, Chen, Qingchun, Cai, Lin
• Format: Conference Proceeding
• Language: English
• Published: IEEE 01.08.2018
• Subjects: Array signal processing; Interference channels; Power demand; Radio frequency; Transmitters; Wireless communication; Wireless sensor networks
• ISSN: 2577-2465
• DOI: 10.1109/VTCFall.2018.8690981

In this paper, we consider the wireless powered communication network, in which K terminals are supplied by one common power station (PS) via the radio frequency (RF) energy harvesting technology to transmit their independent data to the corresponding K receivers. In addition, each terminal is assumed to be equipped with an energy storage to store the collected energy and one data buffer to cache the message to be delivered. We formulate an optimization problem to minimize the average power consumption of the PS subject to the given data arrival rates, the energy sustainability and the data buffer stability constraints at all K terminals. By using Lyapunov framework, an adaptive transmission scheme is proposed to determine the energy beamforming, the transmit power allocation and transmit mode selection based on the energy storage and data buffer status. Our analysis unveils that, there exists an inherent tradeoff between the average power consumption and the average queuing delay, and the requested information rates by multiple energy-constrained wireless powered terminals can be effectively supported with less power consumption if a certain transmission delay is tolerable.