A cell measurement method, comprising: obtaining, by a first network device, a first paging parameter of a cell served by a second network device, wherein the first paging parameter is used to indicate a first time domain position at which a terminal device (230; 2000) monitors a paging message from the second network device; and sending, by the first network device, a reference signal based on the first paging parameter, wherein a time domain position of the reference signal is determined based on the first time domain position, characterized in that the first network device makes the time domain position used to send the reference signal maximally close to the first time domain position, so that the terminal device can both monitor the paging message and measure the reference signal after waking up once, wherein the obtaining, by a first network device, a first paging parameter of a cell served by a second network device comprises: receiving, by the first network device, the first paging parameter from the terminal device (230; 2000); and before the receiving, by the first network device, the first paging parameter from the terminal device (230; 2000), the method further comprises: sending, by the first network device, configuration information to the terminal device (230; 2000), wherein the configuration information is used to configure the terminal device (230; 2000) to report the first paging parameter. obtaining, by a first network device, a first paging parameter of a cell served by a second network device, wherein the first paging parameter is used to indicate a first time domain position at which a terminal device (230; 2000) monitors a paging message from the second network device; and sending, by the first network device, a reference signal based on the first paging parameter, wherein a time domain position of the reference signal is determined based on the first time domain position, characterized in that the first network device makes the time domain position used to send the reference signal maximally close to the first time domain position, so that the terminal device can both monitor the paging message and measure the reference signal after waking up once, wherein the obtaining, by a first network device, a first paging parameter of a cell served by a second network device comprises: receiving, by the first network device, the first paging parameter from the terminal device (230; 2000); and before the receiving, by the first network device, the first paging parameter from the terminal device (230; 2000), the method further comprises: sending, by the first network device, configuration information to the terminal device (230; 2000), wherein the configuration information is used to configure the terminal device (230; 2000) to report the first paging parameter. receiving, by the first network device, the first paging parameter from the terminal device (230; 2000); and before the receiving, by the first network device, the first paging parameter from the terminal device (230; 2000), the method further comprises: sending, by the first network device, configuration information to the terminal device (230; 2000), wherein the configuration information is used to configure the terminal device (230; 2000) to report the first paging parameter.