A feedback information transmission method, comprising: receiving, by a terminal device in a downlink subframe in at least one downlink burst, downlink data sent by an access network device; determining, by the terminal device, that a first downlink subframe set is associated with a first uplink subframe, wherein the first downlink subframe set belongs to the at least one downlink burst, the first uplink subframe is used to send first feedback information corresponding to downlink data in the first downlink subframe set, the first uplink subframe is in a first uplink burst, and the first uplink burst follows the at least one downlink burst; determining, by the terminal device, a first feedback information codebook, and determining the first feedback information based on the first feedback information codebook; determining, by the terminal device, a first uplink channel in the first uplink subframe; and sending, by the terminal device, the first feedback information to the access network device on the first uplink channel; wherein, the method further comprises: determining, by the terminal device, that a second downlink subframe set is associated with a second uplink subframe, wherein the second downlink subframe set belongs to the at least one downlink burst, the first downlink subframe set is a subset of the second downlink subframe set, the second uplink subframe is used to send second feedback information corresponding to downlink data in the second downlink subframe set, the second uplink subframe is in the first uplink burst, and the second uplink subframe follows the first uplink subframe; determining, by the terminal device, a second feedback information codebook, and determining the second feedback information based on the second feedback information codebook; determining, by the terminal device, a second uplink channel in the second uplink subframe; and sending, by the terminal device, the second feedback information to the access network device on the second uplink channel. receiving, by a terminal device in a downlink subframe in at least one downlink burst, downlink data sent by an access network device; determining, by the terminal device, that a first downlink subframe set is associated with a first uplink subframe, wherein the first downlink subframe set belongs to the at least one downlink burst, the first uplink subframe is used to send first feedback information corresponding to downlink data in the first downlink subframe set, the first uplink subframe is in a first uplink burst, and the first uplink burst follows the at least one downlink burst; determining, by the terminal device, a first feedback information codebook, and determining the first feedback information based on the first feedback information codebook; determining, by the terminal device, a first uplink channel in the first uplink subframe; and sending, by the terminal device, the first feedback information to the access network device on the first uplink channel; wherein, the method further comprises: determining, by the terminal device, that a second downlink subframe set is associated with a second uplink subframe, wherein the second downlink subframe set belongs to the at least one downlink burst, the first downlink subframe set is a subset of the second downlink subframe set, the second uplink subframe is used to send second feedback information corresponding to downlink data in the second downlink subframe set, the second uplink subframe is in the first uplink burst, and the second uplink subframe follows the first uplink subframe; determining, by the terminal device, a second feedback information codebook, and determining the second feedback information based on the second feedback information codebook; determining, by the terminal device, a second uplink channel in the second uplink subframe; and sending, by the terminal device, the second feedback information to the access network device on the second uplink channel. determining, by the terminal device, that a second downlink subframe set is associated with a second uplink subframe, wherein the second downlink subframe set belongs to the at least one downlink burst, the first downlink subframe set is a subset of the second downlink subframe set, the second uplink subframe is used to send second feedback information corresponding to downlink data in the second downlink subframe set, the second uplink subframe is in the first uplink burst, and the second uplink subframe follows the first uplink subframe; determining, by the terminal device, a second feedback information codebook, and determining the second feedback information based on the second feedback information codebook; determining, by the terminal device, a second uplink channel in the second uplink subframe; and sending, by the terminal device, the second feedback information to the access network device on the second uplink channel.