Adaptive multi-PHY IEEE802.15.4 TSCH in sub-GHz industrial wireless networks

To provide wireless coverage in challenging industrial environments, IEEE802.15.4 Time-Slotted Channel Hopping (TSCH) presents a robust medium access protocol. Using multiple Physical Layers (PHYs) could improve TSCH even more these heterogeneous environments. However, only defines one fixed-duration timeslot structure allowing packet transmission. PHYs with various data rates therefore does not yield any improvements because of this single-packet limitation combined fixed slot duration. We defined two alternative structures packets transmissions to increase the throughput for higher rate while meeting In addition, we developed flexible Link Quality Estimation (LQE) technique dynamically switch between depending on current environment. This paper covers theoretical evaluation proposed terms throughput, energy consumption and memory constraints backed an experimental validation, using proof-of-concept implementation, which includes topology PHY switching. Our results show that 153 % net can be obtained 84 original confirm our 99 accuracy. Additionally, showed real-life testbed 33 nodes, spanning three floors covering 2550 m2, compact multi-PHY network formed. By distinguishing reliable high PHYs, maximum hop count was achieved 219 kbps. Consequently, (dynamic) single is possible still being backwards compatible duration standard.