An uplink carrier handover method carried out by a network device (110, 600, 700) of a 5G NR network, and the method comprises: obtaining target measurement information, wherein the network device (110, 600, 700) communicates with a terminal device (120, 800, 900) in a current cell by using a first uplink carrier and a second uplink carrier, and the target measurement information comprises first uplink measurement information corresponding to the first uplink carrier, second uplink measurement information corresponding to the second uplink carrier, and downlink measurement information received from the terminal device (120, 800, 900); determining, based on the target measurement information, whether the terminal device (120, 800, 900) needs to be handed over from the first uplink carrier to the second uplink carrier; and when the terminal device (120, 800, 900) needs to be handed over from the first uplink carrier to the second uplink carrier, sending handover instruction information to the terminal device (120, 800, 900), wherein the handover instruction information is used to instruct the terminal device (120, 800, 900) to be handed over from the first uplink carrier to the second uplink carrier; and before the receiving the downlink measurement information from the terminal device (120, 800, 900): sending second configuration information to the terminal device (120, 800, 900), wherein the second configuration information is used to configure a) a type of a downlink measurement event for the terminal device (120, 800, 900), and the downlink measurement event is used by the terminal device (120, 800, 900) to obtain the downlink measurement information by measuring a downlink measurement signal from the network device (110, 600, 700) and b) a measurement time of the downlink measurement event and a threshold for triggering the terminal device (120, 800, 900) to report the downlink measurement information to the network device (110, 600, 700). obtaining target measurement information, wherein the network device (110, 600, 700) communicates with a terminal device (120, 800, 900) in a current cell by using a first uplink carrier and a second uplink carrier, and the target measurement information comprises first uplink measurement information corresponding to the first uplink carrier, second uplink measurement information corresponding to the second uplink carrier, and downlink measurement information received from the terminal device (120, 800, 900); determining, based on the target measurement information, whether the terminal device (120, 800, 900) needs to be handed over from the first uplink carrier to the second uplink carrier; and when the terminal device (120, 800, 900) needs to be handed over from the first uplink carrier to the second uplink carrier, sending handover instruction information to the terminal device (120, 800, 900), wherein the handover instruction information is used to instruct the terminal device (120, 800, 900) to be handed over from the first uplink carrier to the second uplink carrier; and before the receiving the downlink measurement information from the terminal device (120, 800, 900): sending second configuration information to the terminal device (120, 800, 900), wherein the second configuration information is used to configure a) a type of a downlink measurement event for the terminal device (120, 800, 900), and the downlink measurement event is used by the terminal device (120, 800, 900) to obtain the downlink measurement information by measuring a downlink measurement signal from the network device (110, 600, 700) and b) a measurement time of the downlink measurement event and a threshold for triggering the terminal device (120, 800, 900) to report the downlink measurement information to the network device (110, 600, 700).