Simple Distributed Scheduling with Collision Detection in TSCH Networks
Résumé
The IETF IPv6 over the Time Synchronized Channel Hopping mode of IEEE 802.15.4e (6TiSCH) working group standardizes a distributed mechanism for neighbor motes to agree on a schedule to communicate, driven by a Scheduling Function. This letter introduces the notion of “housekeeping” to the Schedule Function, in which motes relocate cells in the schedule to build a collision-free schedule in a distribute manner. The solution, based on detecting under-performing cells and listening for unexpected packets, does not require additional signaling traffic or state. This letter shows that simple housekeeping rules introduced allow a network to contain 17% more motes and suffer from 64% fewer collision, while maintaining end-to-end reliability above 99.5% in a typical industrial environment. This solution is now being discussed for standardization at 6TiSCH.
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