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Efficient network flooding and time synchronization with Glossy

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4 Author(s)
Ferrari, F. ; Comput. Eng. & Networks Lab., ETH Zurich, Zurich, Switzerland ; Zimmerling, M. ; Thiele, L. ; Saukh, O.

This paper presents Glossy, a novel flooding architecture for wireless sensor networks. Glossy exploits constructive interference of IEEE 802.15.4 symbols for fast network flooding and implicit time synchronization. We derive a timing requirement to make concurrent transmissions of the same packet interfere constructively, allowing a receiver to decode the packet even in the absence of capture effects. To satisfy this requirement, our design temporally decouples flooding from other network activities. We analyze Glossy using a mixture of statistical and worst-case models, and evaluate it through experiments under controlled settings and on three wireless sensor testbeds. Our results show that Glossy floods packets within a few milliseconds and achieves an average time synchronization error below one microsecond. In most cases, a node receives the flooding packet with a probability higher than 99.99%, while having its radio turned on for only a few milliseconds during a flood. Moreover, unlike existing flooding schemes, Glossy's performance exhibits no noticeable dependency on node density, which facilitates its application in diverse real-world settings.

Published in:

Information Processing in Sensor Networks (IPSN), 2011 10th International Conference on

Date of Conference:

12-14 April 2011