Examples in this application provides methods and devices for sending wake-up signals. One example method may include receiving, from a core network device, a first category which a terminal device belongs to, where the first category corresponds to a first service feature, receiving, from a network device, a configuration of a plurality of wake-up signals, determining a to-be-monitored wake-up signal in the plurality of wake-up signals based on the first category, and monitoring the to-be-monitored wake-up signal.