The network device pre-configures the plurality of wake up signals, and the configuration of the plurality of wake up signals includes the mapping relationship between category information and a wake up signal. Therefore, after receiving the paging message including the first category to which the terminal device belongs, the network device may determine the wake up signal corresponding to the first category and the grouping factor, based on the first category, the grouping factor, and the mapping relationship between category information and a wake up signal. The wake up signal corresponding to the first category and the grouping factor is the wake up signal that needs to wake up the terminal device. This wake up signal and the to-be-monitored wake up signal that is determined by the terminal device in the plurality of wake up signals in S304 are a same wake up signal. In this way, the terminal device is woken up by using this wake up signal, thereby implementing paging of the terminal device.

Optionally, when determining the to-be-monitored wake up signal in the plurality of wake up signals based on the first category and the grouping factor, the network device may similarly determine the to-be-monitored wake up signal in the plurality of wake up signals by using the following two methods. The two methods are as follows:

Method 1: First, a plurality of to-be-determined wake up signals may be determined in the plurality of wake up signals based on the first category. Then, the to-be-monitored wake up signal is determined in the plurality of to-be-determined wake up signals based on the grouping factor.