IEEE 802.11ax, also known as Wi-Fi 6, is the IEEE standard for wireless local area networks (WLANs) and the successor to 802.11ac. Also known as Efficient Wi-Fi, it is used for overall improvements to Wi-Fi 6 clients in dense environments.serial rs232 to wifi converter It is designed to operate in license-exempt frequency bands between 1 GHz and 7.125 GHz, including the already commonly used 2.4 GHz and 5 GHz bands and the wider 6 GHz band known as Wi-Fi 6E.
2. Main features of Wi-Fi 6
what is wifi6
A key feature of 802.11ax is Orthogonal Frequency Division Multiple Access (OFDMA), the cellular equivalent of Wi-Fi. Other improvements in spectrum utilization include better power control methods to avoid interference with neighboring networks, higher order 1024 QAM, the addition of MIMO and MU-MIMO in the uplink direction for the downlink to further increase throughput, and Reliability Improvements to power consumption and security protocols such as Target Wake Time and WPA3.
① Orthogonal Frequency Division Multiple Access (OFDMA )
OFDMA, which separates the spectrum in time-frequency resource units, works by subdividing the channel into subcarriers and allowing simultaneous transmission to multiple endpoints (devices). A Wi-Fi 6 router can send different signals within the same transmission window. This results in a single transmission from the router being able to communicate with multiple devices, rather than each device having to wait for the router to provide data over the network. OFDMA-based scheduling reduces overhead and latency.
② Multi-user MIMO (MU-MIMO)
With downlink MU-MIMO, the AP can transmit to multiple stations at the same time, while with uplink MU-MIMO, the AP can receive from multiple stations at the same time. OFDMA separates the receivers to different RUs, while with MU-MIMO the devices are separated into different spatial streams.
③ Overlapping Basic Service Set (OBSS)
Overlapping Basic Service Set (OBSS) is another Wi-Fi 6 feature that can help improve network congestion. OBSS enables access points to use "colors" to uniquely identify networks. Coloring enables a device to distinguish transmissions in its own network from those in neighboring networks. Adaptive power and sensitivity thresholds allow dynamic adjustment of transmit power and signal detection thresholds to increase spatial reuse.
④ Beamforming
Beamforming is another technology that Wi-Fi 6 improves to achieve higher speeds. This data transmission method that sounds futuristic is actually relatively simple. Instead of broadcasting data in all directions, routers detect where the device requesting the data is located and route a more localized stream of data in that direction.
⑤ Target Wake Time (TWT)
TWT is a concept developed in 802.11ah to reduce power consumption and media access contention. It allows the device to wake up on periods other than the beacon transmission period. Additionally, the AP can group devices into different TWT periods, reducing the number of devices competing for the wireless medium at the same time.
⑥WPA3
Wi-Fi Alliance requested WPA3 for Wi-Fi6. One of the biggest improvements is the increased cryptographic security achieved through industrial iot gateway the Dragonfly key exchange system (also known as SAE or Simultaneous Authentication of Equals). This method of authentication helps make passwords harder to crack by using a more complex method of establishing a handshake with the Wi-Fi network. This added layer of security, combined with stronger encryption, means Wi-Fi will have stronger security options than ever before.
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