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Time-Slotted Channel Hopping (TSCH) is a synchronous medium access mode ofthe IEEE 802.15.4e standard designed for providing low-latency andhighly-reliable end-to-end communication. TSCH constructs a communicationschedule by combining frequency channel hopping with Time Division MultipleAccess (TDMA). In recent years, IETF designed several standards to definegeneral mechanisms for the implementation of TSCH. However, the problem ofupdating the TSCH schedule according to the changes of the wireless linkquality and node's traffic load left unresolved. In this paper, we usenon-cooperative game theory to propose GT-TSCH, a distributed TSCH schedulerdesigned for low-power IoT applications. By considering selfish behavior ofnodes in packet forwarding, GT-TSCH updates the TSCH schedule in a distributedapproach with low control overhead by monitoring the queue length, the place ofthe node in the Directed Acyclic Graph (DAG) topology, the quality of thewireless link, and the data packet generation rate. We prove the existence anduniqueness of Nash equilibrium in our game model and we find the optimal numberof TSCH Tx timeslots to update the TSCH slotframe. To examine the performanceof our contribution, we implement GT-TSCH on Zolertia Firefly IoT motes and theContiki-NG Operating System (OS). The evaluation results reveal that GT-TSCHimproves performance in terms of throughput and end-to-end delay compared tothe state-of-the-art method.

GT-TSCH: Game-Theoretic Distributed TSCH Scheduler for Low-Power IoT Networks