Block Design for Wake-up Schedules in IoT Networks

To reduce energy consumption for IoT networks, this paper investigates the problem of devising optimal asymmetric wake-up schedules for asynchronous slotted duty-cycled MAC protocol. On the one hand, to ensure a bounded rendezvous time to exchange data for the asynchronous slotted protocol, the wake-up schedules intersect regardless of rotations. On the other hand, they are designed to minimize worst-case latency for given duty cycles to be energy-efficient. We formulate the problem as a block design problem and devise the optimal asymmetric wake-up schedules based on the theoretical foundation. Simulation results demonstrate that the proposed schedules outperform various existing schedules of different kinds.