A system includes a first electronic device that activates a first receiver according to a communication schedule that includes a plurality of frames. Each frame is organized according to a grid including a plurality of cells, wherein the cells are associated with a plurality of communication channels and a plurality of time slots. The system also includes a second electronic device that communicates with the first electronic device by transmitting a wake-up packet during a first time slot on a first communication channel. The first time slot and the first communication channel are located at a known position of a respective grid in each frame of the communication schedule. The first electronic device performs an operation based on the wake-up packet after receiving the wake-up packet. The second electronic device also receives a first acknowledgment packet associated with the wake-up packet.