The final 802.11ax standard will be released in 2019, and the 5G standard will be released in 2020, not too far behind.
Some media say that ax will be 4 times faster than the current ac, but the wiki shows that it is only 600Mb/s (ht80), and it is currently 433Mb/s, which is one third faster than now. Later, some data are only in a dense environment. If the bandwidth or total throughput is increased by 4 bits, note that the bandwidth is only increased by 4 bits, and if it is a single-user environment, it is only increased by one-third of the speed.
802.11ac uses the uplink and downlink mu-mimo, mu-ofdm (which should be OFDMA, assigning different sub-carriers to different users) to improve network efficiency and bandwidth in a multi-user dense environment.
Therefore, 802.11ax will be more suitable for densely populated environments, and it does not seem to be of great significance for home use.
In addition, the wave velocity forming detection is introduced to improve the efficiency of beam forming, and the speed is increased to 600Mb/s single-stream through 1024QAM, and the dual-stream is 1200Mb/s.
The highest support for HT160 and 8x8MIMO seems to be no different from now.
In addition, 802.11ax will support 2.4GHz and 5GHz at the same time, and it will be more energy efficient.
Attached is the 802.11ax draft version 1.0.
| 802.11ac |
802.11ax |
|
| BANDS |
5 GHz |
2.4 GHz and 5 GHz |
| CHANNEL BANDWIDTH |
20 MHz, 40 MHz, 80 MHz, 80+80 MHz & 160 MHz |
20 MHz, 40 MHz, 80 MHz, 80+80 MHz & 160 MHz |
| FFT SIZES |
64, 128, 256, 512 |
256, 512, 1024, 2048 |
| SUBCARRIER SPACING |
312.5 kHz |
78.125 kHz |
| OFDM SYMBOL DURATION |
3.2 us + 0.8/0.4 us CP |
12.8 us + 0.8/1.6/3.2 us CP |
| HIGHEST MODULATION |
256-QAM |
1024-QAM |
| DATA RATES |
433 Mbps (80 MHz, 1 SS) 6933 Mbps (160 MHz, 8 SS) |
600.4 Mbps (80 MHz, 1 SS) 9607.8 Mbps (160 MHz, 8 SS) |
http://www.ni.com/white-paper/53150/en/