期刊
IEEE WIRELESS COMMUNICATIONS LETTERS
卷 8, 期 2, 页码 628-631出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/LWC.2018.2890605
关键词
Age of information; wireless power transfer; energy harvesting; sensor networks
资金
- European Regional Development Fund
- Republic of Cyprus through the Research Promotion Foundation [INFRASTRUCTURES/1216/0017]
In this letter, we deal with the age of information (AoI) for a sensor network with wireless power transfer (WPT) capabilities. Specifically, we study a simple network topology, where a sensor node harvests energy from radio frequency signals (transmitted by a dedicated energy source) to transmit real-time status updates. The sensor node generates an update when its capacitor/battery becomes fully charged and transmits by using all the available energy without further energy management. The average AoI performance of the considered greedy policy is derived in closed form and is a function of the capacitor's size. The optimal value of the capacitor that maximizes the freshness of the information, corresponds to a simple optimization problem requiring a 1-D search. The derived theoretical results provide useful performance bounds for practical WPT networks.
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