A method performed by a base unit, the method comprising: transmitting a plurality of data blocks; receiving a feedback message in a time slot, wherein the feedback message corresponds to the plurality of data blocks, and the feedback message comprises at least one of: a sequence of a sequence set, wherein the sequence indicates feedback information, and the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in a time domain; a plurality of sequences of a sequence set, wherein each sequence of the plurality of sequences indicates feedback information, the feedback information corresponds to one data block of the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in the time domain; a plurality of sequences of a sequence set in a physical resource of a physical resource set, wherein the plurality of sequences and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; wherein the sequence set is selected from a group comprising a binary phase shift keying sequence set, a quadrature phase shift keying sequence set, and a Hadamard sequence set. transmitting a plurality of data blocks; receiving a feedback message in a time slot, wherein the feedback message corresponds to the plurality of data blocks, and the feedback message comprises at least one of: a sequence of a sequence set, wherein the sequence indicates feedback information, and the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in a time domain; a plurality of sequences of a sequence set, wherein each sequence of the plurality of sequences indicates feedback information, the feedback information corresponds to one data block of the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in the time domain; a plurality of sequences of a sequence set in a physical resource of a physical resource set, wherein the plurality of sequences and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; wherein the sequence set is selected from a group comprising a binary phase shift keying sequence set, a quadrature phase shift keying sequence set, and a Hadamard sequence set. a sequence of a sequence set, wherein the sequence indicates feedback information, and the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in a time domain; a plurality of sequences of a sequence set, wherein each sequence of the plurality of sequences indicates feedback information, the feedback information corresponds to one data block of the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; a sequence of a sequence set in a physical resource of a physical resource set, wherein the sequence and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and the sequence is multiplexed with demodulation reference signal symbols in the time domain; a plurality of sequences of a sequence set in a physical resource of a physical resource set, wherein the plurality of sequences and the physical resource indicate feedback information, the feedback information corresponds to the plurality of data blocks, and each sequence of the plurality of sequences is multiplexed with demodulation reference signal symbols in the time domain; wherein the sequence set is selected from a group comprising a binary phase shift keying sequence set, a quadrature phase shift keying sequence set, and a Hadamard sequence set.