(事前公開アブストラクト) The same wireless channel has to be reused in the wireless LAN (WLAN) due to the limited available channel, and therefore the achievable throughput is limited by the co-channel interference (CCI). Hence, the same channel needs to be reused to minimize the CCI according to changing CCI environment. Recently, we proposed an interference-aware channel segregation based dynamic channel assignment (IACS-DCA). It has been shown that IACS-DCA forms a channel reuse pattern with low CCI in a distributed manner. In this paper, we introduce the IACS-DCA to IEEE 802.11 WLAN. We show by computer simulation that WLAN access points (APs) equipped with IACS-DCA can change their channel according to changing CCI environment caused by move of AP.