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The popularity of concurrent transmissions (CT) has soared after recentstudies have shown their feasibility on the four physical layers specified byBLE 5, hence providing an alternative to the use of IEEE 802.15.4 for thedesign of reliable and efficient low-power wireless protocols. However, todate, the extent to which physical layer properties affect the performance ofCT has not yet been investigated in detail. This paper fills this gap andprovides an extensive study on the impact of the physical layer on CT-basedsolutions using IEEE 802.15.4 and BLE 5. We first highlight through simulationhow the impact of errors induced by relative carrier frequency offsets on theperformance of CT highly depends on the choice of the underlying physicallayer. We then confirm these observations experimentally on real hardware andwith varying environmental conditions through an analysis of the bit errordistribution across received packets, unveiling possible techniques toeffectively handle these errors. We further study the performance of CT-baseddata collection and dissemination protocols in the presence of RF interferenceon a large-scale testbed, deriving insights on how the employed physical layeraffects their dependability.

Understanding Concurrent Transmissions: The Impact of Carrier Frequency Offset and RF Interference on Physical Layer Performance