Channel-Dependent Scheduling in Wireless Energy Transfer for Mobile Devices

Wen Fang, Gang Wang, Georgios B. Giannakis, Qingwen Liu, Xin Wang, Hao Deng

Research output: Contribution to journalArticlepeer-review


Resonant Beam Charging (RBC) is a long-range, high-power, mobile, and safe Wireless Energy Transfer (WET) technology, which can provide wireless power for mobile devices like Wi-Fi communications. Due to the wireless energy transmission decay in RBC systems, the charging power received per device relies on the distance-dependent energy transmission channel. To extend battery life of all devices, this paper develops a Channel-Dependent Charge (CDC) scheduling algorithm to control receivers' charging power, order and duration. Each receiver is assigned a dynamic scheduling coefficient, which is the product of the battery's remaining energy and the energy transmission channel. The resultant optimal charging order is to charge the receiver with the minimum scheduling coefficient first per equal unit-length time slot. It is shown analytically and experimentally that the CDC algorithm achieves higher charging performance than other scheduling algorithms including the Round-Robin Charge (RRC) scheduling algorithms. In a word, the CDC scheduling algorithm offers a viable approach to extending mobile devices' battery life while accounting for varying RBC transmission channels.

Original languageEnglish (US)
Article number8957238
Pages (from-to)3330-3340
Number of pages11
JournalIEEE Transactions on Vehicular Technology
Issue number3
StatePublished - Mar 2020

Bibliographical note

Funding Information:
Manuscript received November 30, 2019; accepted January 2, 2020. Date of publication January 13, 2020; date of current version March 12, 2020. This work was supported in part by the National Natural Science Foundation of China under Grant 61771344, and in part by the China Postdoctoral Science Foundation under Grant 2018M632161. The review of this article was coordinated by Dr. J. Liu. (Corresponding authors: Qingwen Liu; Hao Deng.) W. Fang, Q. Liu, and H. Deng are with the College of Electronic and Information Engineering, Tongji University, Shanghai 200000, China (e-mail:;;

Publisher Copyright:
© 1967-2012 IEEE.


  • Wireless energy transfer (WET)
  • channel-dependent charge scheduling algorithm
  • resonant beam charging


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