Communication method and communication device in wireless lan system that supports multi-bandwidth

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

• a processor;
• and
• a transmitter,
• wherein the processor is configured to:
• generate a physical frame including a plurality of time domain fields,
• cause the transmitter to transmit the physical frame,
• wherein the frequency domain repetition is applied to a first part of the plurality of time domain fields without being applied to a second part of the plurality of time domain fields when the frequency domain repetition is applied to the physical frame,
• wherein the second part is different from the first part,
• wherein the frequency domain repetition includes mapping a same information to a lower half of frequency subcarriers and an upper half of the frequency subcarriers, and
• wherein a phase different between a phase applied to information mapped to the lower half of the frequency subcarriers of the first part of the plurality of time domain fields and a phase applied to information mapped to the upper half of the frequency subcarriers of the first part of the plurality of time domain fields is 0 degree and 180 degree.