The method disclosed in present embodiments includes: a terminal device receives downlink data in at least one downlink burst; determines that a first downlink subframe set is associated with a first uplink subframe, where 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 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; determines a first feedback information codebook, and determines the first feedback information based on the codebook; determines a first uplink channel in the first uplink subframe; and sends the first feedback information to the access network device on the first uplink channel. According to the method, the terminal device can properly sends ACK/NACK feedback information in a U-LTE scenario.