Network-wide Consensus Utilizing the Capture Effect in Low-power Wireless Networks

Al Nahas, Beshr, 1985 (author): Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden

Landsiedel, Olaf, 1979 (author): Chalmers tekniska högskola,Chalmers University of Technology,Chalmers University of Technology, Sweden

(creator_code:org_t)

ISBN 9781450354592
2017-11-06
2017
English.
In: Proceedings of the Conference on Embedded Networked Sensor Systems (ACM SenSys). - New York, NY, USA : ACM. - 9781450354592

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Abstract Subject headings

In low-power wireless networking, new applications such as cooperative robots or industrial closed-loop control demand for network-wide agreement at low-latency and high reliability. Distributed consensus protocols is a mature field of research in a wired context, but has received little attention in low-power wireless settings. In this paper, we present A2: Agreement in the Air, a system that brings distributed consensus to low-power multi-hop networks. We introduce Synchrotron, a synchronous transmissions kernel that builds a robust mesh by exploiting the capture effect, frequency hopping with parallel channels, and link-layer security. We build A2 on top of this reliable base layer, and enable the two- and three-phase commit protocols, as well as network services such as joining, hopping sequence distribution and re-keying.We evaluate A2 on four public testbeds with different deployment densities and sizes. A2 requires only 475 ms to complete a two-phase commit over 180 nodes. The resulting duty cycle is 0.5 percent for 1-minute intervals. We show that A2 achieves zero losses end-to-end over long experiments, representing millions of data points.When further adding controlled failures, we show that two-phase commit ensures transaction consistency in A2 while three-phase commit provides liveness at the expense of inconsistency under specific failure scenarios.

NATURVETENSKAP -- Data- och informationsvetenskap (hsv//swe)
NATURAL SCIENCES -- Computer and Information Sciences (hsv//eng)
NATURVETENSKAP -- Data- och informationsvetenskap -- Datavetenskap (hsv//swe)
NATURAL SCIENCES -- Computer and Information Sciences -- Computer Sciences (hsv//eng)

By the author/editor: Al Nahas, Beshr, ...; Duquennoy, Simon; Landsiedel, Olaf ...

About the subject

NATURAL SCIENCES: NATURAL SCIENCES; and Computer and Inf ...; and Computer Science ...

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