SCAPE: Safe charging with adjustable power

Haipeng Dai, Yunhuai Liu, Guihai Chen, Xiaobing Wu, Tian He

Research output: Chapter in Book/Report/Conference proceedingConference contribution

36 Scopus citations


Wireless power transfer technology is considered as one of the promising solutions to address the energy limitation problems for end-devices, but its incurred potential risk of electromagnetic radiation (EMR) exposure is largely overlooked by most existing works. In this paper, we consider the Safe Charging with Adjustable Power (SCAPE) problem, namely, how to adjust the power of chargers to maximize the charging utility of devices, while assuring that EMR intensity at any location in the field does not exceed a given threshold Rt. We present novel techniques to reformulate SCAPE into a traditional linear programming problem, and then remove its redundant constraints as much as possible to reduce computational effort. Next, we propose a distributed algorithm with provable approximation ratio (1-ε). Through extensive simulation and test bed experiments, we demonstrate that our (1-ε)-approximation algorithm outperforms the Set-Cover algorithm by up to 23%, and has an average performance gain of 41.1% over the SCP algorithm in terms of the overall charging utility.

Original languageEnglish (US)
Title of host publicationProceedings - International Conference on Distributed Computing Systems
PublisherInstitute of Electrical and Electronics Engineers Inc.
Number of pages10
ISBN (Electronic)9781479951680
StatePublished - Aug 29 2014
Event2014 IEEE 34th International Conference on Distributed Computing Systems, ICDCS 2014 - Madrid, Spain
Duration: Jun 30 2014Jul 3 2014

Publication series

NameProceedings - International Conference on Distributed Computing Systems


Other2014 IEEE 34th International Conference on Distributed Computing Systems, ICDCS 2014

Bibliographical note

Publisher Copyright:
© 2014 IEEE.


  • adjustable power
  • distributed algorithm
  • safe charging
  • wireless power transfer


Dive into the research topics of 'SCAPE: Safe charging with adjustable power'. Together they form a unique fingerprint.

Cite this