Harq and link adaptation in wireless communication system

An electronic device for facilitating wireless communication, the device comprising:

• one or more memories;
• and
• one or more processors coupled to the one or more memories, the one or more processors configured to cause:
• transmitting a first data unit including a first short training field (STF), a first long training field (LTF), a signal field, a second STF, a second LTF, and a data field including a first hybrid automatic repeat request (HARQ) unit;
• receiving a second data unit including first HARQ-related information indicating that the first HARQ unit fails to be decoded;
• and
• transmitting a third data unit including a preamble, wherein 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.

A method performed by an electronic device, comprising:

• receiving a first data unit including a first short training field (STF), a first long training field (LTF), a signal field, a second STF, a second LTF, and a data field including a first hybrid automatic repeat request (HARQ) unit;
• transmitting a second data unit including first HARQ-related information indicating that the first HARQ unit fails to be decoded;
• receiving a third data unit including a preamble, wherein 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;
• obtaining a second HARQ unit based on determination that the second HARQ-related information indicates that the third data unit includes retransmitted data;
• and
• decoding the second HARQ unit with the first HARQ unit.