The embodiment shown in FIG. 2 describes in detail that, in a wake up signal sending process, when the to-be-monitored signal is determined, in a possible implementation, the first category to which the terminal device belongs may be first determined based on the service feature, and then the to-be-monitored wake up signal that the terminal device needs to monitor is determined based on the first category and the mapping relationship between category information and a wake up signal. The following provides detailed descriptions in which in another possible implementation, the to-be-monitored wake up signal that the terminal device needs to monitor may be determined with reference to both the service feature and the grouping factor (for example, the identifier of the terminal device). In other words, the first category to which the terminal device belongs may be first determined based on the service feature, and then, the to-be-monitored wake up signal that the terminal device needs to monitor is determined based on both the first category and the grouping factor.

In another possible implementation, for example, FIG. 3 is a schematic diagram of another wake up signal sending method according to an embodiment of this application. The wake up signal sending method may include the following steps.

S301: A core network device determines, based on a service feature of a terminal device, a first category to which a terminal device belongs.

S302: The core network device sends the first category to which the terminal device belongs to the terminal device.

S303: The network device sends a configuration of a plurality of wake up signals to the terminal device.