FreeBee: Cross-technology communication via free side-channel

Song Min Kim, Tian He

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

198 Scopus citations


This paper presents FreeBee, which enables direct unicast as well as cross-technology/channel broadcast among three popular wireless technologies: WiFi, ZigBee, and Bluetooth. Our design aims to shed the light on the opportunities that cross-technology communication has to offer including, but not limited to, cross-technology interference mitigation and context-aware smart operation. The key concept of FreeBee is to modulate symbol messages by shifting the timing of periodic beacon frames already mandatory for wireless standards without incurring extra traffic. Such a generic cross technology design consumes zero additional bandwidth, allowing continuous broadcast to safely reach mobile and/or duty-cycled devices. A new interval multiplexing technique is proposed to enable concurrent broadcasts from multiple senders or boost the transmission rate of a single sender. Theoretical and experimental exploration reveals that Free Bee offers a reliable symbol delivery under a second and supports mobility of 30mph and low duty-cycle operations of under 5%.

Original languageEnglish (US)
Title of host publicationMobiCom 2015 - Proceedings of the 21st Annual International Conference on Mobile Computing and Networking
PublisherAssociation for Computing Machinery
Number of pages14
ISBN (Electronic)9781450336192
StatePublished - Sep 7 2015
Event21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015 - Paris, France
Duration: Sep 7 2015Sep 11 2015

Publication series

NameProceedings of the Annual International Conference on Mobile Computing and Networking, MOBICOM


Other21st Annual International Conference on Mobile Computing and Networking, MobiCom 2015

Bibliographical note

Funding Information:
This work was supported in part by the National Science Foundation under grants CNS-0845994 and CNS-1444021. We sincerely thank our anonymous shepherd and the reviewers for their valuable comments and feedback.

Publisher Copyright:
© 2015 ACM.


  • Cross-technology
  • Protocol
  • Wireless


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