An electronic device receives a first data unit including a first hybrid automatic repeat request (HARQ) unit and transmits a second data unit including first HARQ-related information indicating that the first HARQ unit fails to be decoded. The electronic device receives a third data unit including a preamble. The preamble includes a first STF, a first LTF, a signal field, a second STF, and a second LTF, and the third data unit includes second HARQ-related information indicating whether the third data unit includes retransmitted data. The electronic device obtains a second HARQ unit based on determination that the second HARQ-related information indicates that the third data unit includes retransmitted data and decodes the second HARQ unit with the first HARQ unit.