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

Beshr Al Nahas (Institutionen för data- och informationsteknik, Nätverk och system (Chalmers) ) ; Simon Duquennoy ; Olaf Landsiedel (Institutionen för data- och informationsteknik, Nätverk och system (Chalmers) )
Proceedings of the Conference on Embedded Networked Sensor Systems (ACM SenSys) 2017, (2017)
[Konferensbidrag, refereegranskat]

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.

Nyckelord: Consensus, Two-phase commit, Three-phase commit, Group membership, Synchronous transmissions, Capture effect, WSN, IoT



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Denna post skapades 2017-08-15. Senast ändrad 2017-08-15.
CPL Pubid: 251160