Tone reassignment for harq

A station (STA) in a wireless local area network (WLAN) system, the STA comprising:

• a transceiver for transmitting and receiving a radio signal;
• and
• a processor coupled to the transceiver,
• wherein the processor is further configured:
• to transmit a first physical protocol data unit (PPDU) including a plurality of first constellation symbols related to an initial transmission, wherein the first PPDU includes a first resource unit (RU), wherein the plurality of first constellation symbols are assigned to a plurality of subcarriers in the first RU based on a first allocation pattern;
• to receive a retransmission request related to the first PPDU;
• and
• to transmit a second PPDU including a plurality of second constellation symbols related to a retransmission, wherein the second PPDU includes a second RU, wherein the plurality of second constellation symbols are assigned to a plurality of subcarriers in the second RU based on a second allocation pattern.

A method in a wireless local area network (WLAN) system, the method comprising:

• receiving, by a station (STA), a first physical protocol data unit (PPDU) including a plurality of first constellation symbols related to an initial transmission, wherein the first PPDU includes a first resource unit (RU), wherein the plurality of first constellation symbols are assigned to a plurality of subcarriers in the first RU based on a first allocation pattern;
• decoding, by the STA, the first PPDU based on the first allocation pattern;
• transmitting, by the STA, a retransmission request related to the first PPDU;
• and
• receiving, by the STA, a second PPDU including a plurality of second constellation symbols related to a retransmission, wherein the second PPDU includes a second RU, wherein the plurality of second constellation symbols are assigned to a plurality of subcarriers in the second RU based on a second allocation pattern.