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.