Method of operation in wireless local area network system and apparatus supporting the same

A wireless apparatus operating in a wireless local area network system, the wireless apparatus comprising:

• a transceiver transmitting and receiving radio signals;
• and
• a processor operatively coupled to the transceiver and configured for:
• receiving a channel usage response from an access point, the channel usage response comprising channel usage information and transmit power regulation information, the channel usage information being for coexistence with an infrastructure network, and
• operating by using the channel usage information,
• wherein the channel usage information comprises:
• at least one channel entry field indicating at least one recommended channel;
• and
• a usage mode field indicating usage of the at least one recommended channel listed in the at least one channel entry field,
• wherein the transmit power regulation information comprises a plurality of maximum transmit power fields, and
• wherein each of maximum transmit power field specifies a maximum transmit power limit for transmission on a corresponding channel bandwidth.