The Application discloses a signal sending method that includes: generating, by a network device, a first indication signal, where the first indication signal is used to indicate that a terminal device is not paged and/or no system message changes, the first indication signal corresponds to a first international mobile subscriber identity (IMSI) set, and a quantity of IMSIs in the first IMSI set is less than or equal to a quantity of IMSIs corresponding to one paging occasion (PO); and sending, by the network device, the first indication signal to a first terminal device, where the first terminal device is a terminal device corresponding to any IMSI in the first IMSI set.