Abstract: It proposes a sleep method of the wireless electronic shelf label system using relative time, based on the Internet of Things. Then, it provides a device model for electronic shelf labels controlled by relative time, the system workflow, a timesharing queuing algorithm, and a relativetime sleep algorithm. The experimental results show that the effective use of relative time helps to manage a large number of asynchronous electronic shelf labels working together. The working status of each label is accurately and simply controlled via a server that commands the time of sleep, wakeup, and communication of each label, thus increasing each label's power efficiency.

Key words: electronic shelf labels, sleep, relative time, power efficiency, Internet of Things