For example, the quantity of the plurality of wake up signals is 8, and a modulo-4 operation is performed on the identifier of the terminal device. The eight wake up signals are a wake up signal 1, a wake up signal 2, a wake up signal 3, a wake up signal 4, a wake up signal 5, a wake up signal 6, a wake up signal 7, and a wake up signal 8. A configuration of the eight wake up signals includes a mapping relationship between category information and a wake up signal. A group 1 is a group in which a remainder obtained after the modulo-4 operation is performed on the identifier of the terminal device is 0. A group 2 is a group in which a remainder obtained after the modulo-4 operation is performed on the identifier of the terminal device is 1. A group 3 is a group in which a remainder obtained after the modulo-4 operation is performed on the identifier of the terminal device is 2. A group 3 is a group in which a remainder obtained after the modulo-4 operation is performed on the identifier of the terminal device is 3. When the to-be-monitored wake up signal is determined in the plurality of wake up signals based on the first category and the grouping factor, reference may be made to the following Table 2: