A communication method and apparatus are provided to achieve network energy saving in communications technologies. The method includes a network device sends configuration information that indicates a relationship between a resource of a wake-up signal and a terminal device identifier. The network device receives a wake-up signal on a first resource, determines a second resource based on the first resource, or an identifier of a first terminal device, and sends a paging message on the second resource, where the identifier of the first terminal device is a terminal device identifier associated with the first resource.