Wireless Communication System And Wireless Communication Method

A wireless communication station which transmits and receives a frame using a channel by access control based on carrier sense multiple access with collision avoidance (CSMA/CA) using a clear channel assessment threshold (CCA threshold), wherein:

• a format that includes a field for an identifier of a basic service set (BSS) within a preamble of the frame is defined as an HE format;
• said wireless communication station comprising a control part which is configured to perform:
• checking a type and a format of a received frame;
• and
• if the type is a predetermined control frame, performing a first process,
• if the format is HE format and the identifier of BSS within a preamble of the received frame is consistent with its own BSS, performing a second process, and
• if the format is HE format and the identifier of BSS within a preamble of the received frame is not consistent with its own BSS, performing a third process.