Abstract: With the rapid development of artificial intelligence and the Internet of Things（IoT）, the number of wireless LAN devices has exceeded 25 billion, and many new applications and requirements have been created, in the face of high speed transmission and complex space environment there are many challenges and bottlenecks in the current IEEE 802.11 standards. As a result, the IEEE has begun to develop the next generation of WLAN standards, 802.11ax, which will increase to data transfer rate to 9000 Mbit/s, to achieve a new generation of higher speed, higher efficiency and more energy saving standards that will better meet the rapidly growing market demand.

Key words: IEEE 802.11ax, OFDMA, MU-MIMO, BSS Coloring