determining the to-be-monitored wake up signal in the plurality of to-be-determined wake up signals based on the first category.

In a possible implementation, Before the receiving, from a core network device, a first category to which a terminal device belongs, the method may further include:

sending the service feature of the terminal device to the core network device, so that after receiving the service feature sent by the terminal device, the core network device may determine, based on the service feature, the category to which the terminal device belongs.

In a possible implementation, the wake up signal sending method may further include:

If the to-be-monitored wake up signal indicates that the terminal device is to be paged, a physical downlink control channel is monitored in a paging subframe corresponding to the to-be-monitored wake up signal; or

if the to-be-monitored wake up signal indicates that the terminal device is not to be paged, a physical downlink control channel is not monitored in a paging subframe corresponding to the to-be-monitored wake up signal, in other words, the terminal device may continue to maintain a current sleep state or power saving state.

In a possible implementation, terminal devices having different service features have different probabilities of being paged.

According to a second aspect, an embodiment of this application further provides a wake up signal sending method. The wake up signal sending method may include:

sending, to a terminal device, a first category to which the terminal device belongs, where different categories correspond to different service features; and