Method and apparatus for indicating channel in wireless local area network

An apparatus for indicating a channel in a wireless local area network (WLAN), comprising:

• a baseband circuit, configured to generate a physical protocol data unit (PPDU), wherein the PPDU includes a preamble field and a data field, a high efficiency signal (HE-SIG) field of the preamble field includes a bandwidth identifier;
• and the bandwidth identifier includes three bits;
• wherein one or more values of the three bits indicate a data transmission channel in a channel having a bandwidth equal to or greater than 80 MHz;
• each of the one or more values of the three bits indicates one mode of the data transmission channel;
• and
• in each mode, at least a primary 20 MHz channel and a 20 MHz channel whose location is opposite parity compared with a location of the primary 20 MHz channel are included in the data transmission channel, and an another 20 MHz channel in the channel having a bandwidth equal to or greater than 80 MHz is not included in the data transmission channel;
• a radio frequency circuit, configured to send the PPDU.