The configuration of the plurality of wake up signals includes a mapping relationship between category information and a wake up signal. One piece of category information may correspond to one wake up signal, or may correspond to a plurality of wake up signals. Certainly, the network device supports a configuration manner in which classification is performed by using category information.

When sending the configuration of the plurality of wake up signals to the terminal device, the network device may broadcast the configuration of the plurality of wake up signals to terminal devices in a cell in a broadcast manner, so that the terminal devices in the cell can obtain the configuration of the plurality of wake up signals.

After respectively obtaining the first category to which the terminal device belongs and the configuration of the plurality of wake up signals through S202 and S203, the terminal device may determine, based on the first category and the mapping relationship that is between category information and a wake up signal and that is included in the configuration of the plurality of wake up signals, a to-be-monitored wake up signal in the plurality of wake up signals, that is, perform the following S204:

S204: The terminal device determines the to-be-monitored wake up signal in the plurality of wake up signals based on the first category and the mapping relationship between category information and a wake up signal.

There may be one or more to-be-monitored wake up signals, and a quantity of the to-be-monitored wake up signals is less than a quantity of the plurality of wake up signals.