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Low-power wireless IoT networks have traditionally operated over a singlephysical layer (PHY) -- many based on the IEEE 802.15.4 standard. However,recent low-power wireless chipsets offer both the IEEE 802.15.4 and all fourPHYs of the Bluetooth 5 (BT 5) standard. This introduces the intriguingpossibility that IoT solutions might not necessarily be bound by the limits ofa single PHY, and could actively or proactively adapt their PHY depending on RFor networking conditions (e.g., to offer a higher throughput or a longer radiorange). Several recent studies have explored such use-cases. However, thesestudies lack comprehensive evaluation over various metrics (such asreliability, latency, and energy) with regards to scalability and the RadioFrequency (RF) environment. In this work we evaluate the performance of IEEE802.15.4 and the four BT 5 2.4GHz PHY options for the recently completed IETF6TiSCH low-power wireless standard. To the best of our knowledge, this is thefirst work to directly compare these PHYs in identical settings. Specifically,we use a recently released 6TiSCH simulator, TSCH-Sim, to compare these PHYoptions in networks of up to 250 nodes over different RF environments (home,industrial, and outdoor), and highlight from these results how different PHYoptions might be better suited to particular application use-cases.

BlueTiSCH: A Multi-PHY Simulation of Low-Power 6TiSCH IoT Networks