It should be noted that, in the foregoing Table 2, that the category information includes the two categories of the uplink service trigger and the downlink service trigger is merely used as an example for description similarly. Certainly, the category information may alternatively include another representation manner, for example, a high probability, a medium probability, or a low probability.
S305: The core network device sends a paging message to the network device.
The paging message includes an identifier of the terminal device and the first category. For example, the identifier of the terminal device may be a device number when the terminal device is delivered from a factory, or may be a device identifier allocated by the core network device to the terminal device, provided that the identifier can uniquely identify the terminal device. The identifier of the terminal device is not further limited in this embodiment of this application.
When determining to page a terminal device, the core network device may send a paging message to the network device, where the paging message may include an identifier of the terminal device and a category to which the terminal device belongs, so that the network device performs the following S306 after receiving the paging message:
S306: The network device determines the to-be-monitored wake up signal in the plurality of wake up signals based on the first category and the grouping factor.