Compared with previous Wi-Fi standards, next-generation wireless local area network (WLAN) standard 802.11ax capacity bigger, stronger data transmission performance. It embodies the most fundamental change in the Wi-Fi works from 802.11n (802.11n first appeared in 2004 in the product, data transfer rates up to 100 megabits per second) since. The primary purpose of the design 802.11ax is to solve network capacity problems because the network capacity has become a big problem airports, sporting events and campus environments such as dense.
Wireless high-efficiency include the following key features:
- Draft protocol compatible with earlier 802.11a / b / g / n / ac
- Enhance the high-density scenarios, such as the average throughput of railway stations, airports, and stadiums for each user.
- Data rate and channel width and 802.11ac are similar to the MCS 10 and 11 add two rates, the use of 1024-QAM.
- Downlink and uplink multi-user operating through MU-MIMO and orthogonal frequency division multiple access (OFDMA) technology.
- FFT size of the OFDM greater (4 times greater), the sub-carrier spacing narrower (closer 4X), and for improving the robustness and outdoor symbol time performance and longer multipath fading environments (the 4X).
- And improved traffic flow channel access
- Longer battery life and better power management
More about the OFFICIAL IEEE 802.11ax timeline