Disclosed herein are a signal transmission method, a base station, and a network node. A base station obtains a wake-up capability of a terminal device. The base station determines, according to the wake-up capability, a first time position for sending a power-saving signal. The base station sends the power saving signal to the terminal device on the first time position. The power-saving signal is used for indicating that the second terminal device wakes up or sleeps at a second time position. The wake-up capability includes a first wake-up capability and a second wake-up capability. The wake-up time of the terminal device having the first wake-up capability is longer than the wake-up time of the terminal device having the second wake-up capability. Therefore, by obtaining the wake-up capability of the terminal device and determining, according to the wake-up capability of the terminal device, the time position for sending a power-saving signal, the base station can ensure that the terminal device effectively wakes up or sleeps according to the power saving signal.