Monday, April 12, 2021

What it is Wi-Fi 6 ?

























According to the IEEE (Institute of Electrical and Electronics Engineers) naming convention, the Wi-Fi protocol version has always adopted the naming format "802.11" + letters. Wi-Fi 6 is actually 802.11ax,

which is simplified for commercial use and more convenient for users to remember. In addition to Wi-Fi 6, the Wi-Fi Alliance has renamed 802.11n and 802.11ac. Wi-Fi 4 & Wi-Fi 5) .


 What is the design goal of Wi-Fi 6? 

From 802.11 a/b/g/n to today's highly popular 802.11 a protocol, the development of the protocol version is focused on providing higher peak rates. From the initial 802.11b 11Mbps, to 802.11g 54Mbps, to 802.11n 450Mbps and 802.11ac wave1 1.3Gbps, the theoretical peak rate is growing.

In the face of today's huge Wi-Fi user community, evaluating the quality of Wi-Fi signals depends not only on how fast the peak rate is, but on the Wi-Fi network, which requires more capacity. Multiterminal users can maintain stable network quality while connected at the same time. Therefore, compared with the previous design goals, the design of the 802.11ax standard draws on the cellular communication technology of mobile phones, and tends to adapt Wi-Fi to the intensive use scenario .  



What are the advantages of Wi-Fi 6? 


High compatibility: capable of running on both 2.4Ghz and 5GHz bands (compared to 802.11ac, which runs only in the 5GHz band), 802.11ax is backward compatible with a/b/g/n/ac.

  High rate: Thanks to the introduction of technologies such as uplink MU-MIMO, 1024QAM modulation, and 8*8 MIMO, Wi-Fi 6 has a maximum rate of 9.6 Gbps.

 High access number: 802.11ax AP can allocate the entire channel to one client, or use OFDMA (Orthogonal Frequency Division Multiple Access) technology to divide the channel into multiple terminals for simultaneous access. It divides existing 802.11 channels (20, 40, 80, and 160 MHz bandwidth) into smaller subchannels with a predefined number of subcarriers. According to the communication needs of multiple users, how to allocate channels is allocated, and all available resource units are always allocated in the downlink direction. In a dense user environment, many users are often unable to compete for access to the channel, and the 802.11ax protocol greatly increases the number of concurrently accessible users. 

Low power consumption: Another new technology in Wi-Fi 6 TWT (Timed Wake Mechanism) allows communication between APs and terminals, reducing the time required to maintain transmission and search signals, and supporting large-scale IoT environments. Energy-saving work, such as smart switches at home, smart remotes, etc., that always maintain Wi-Fi connectivity. Wi-Fi 6 can optimize the energy-saving mechanism of the device to provide a more reliable and energy-efficient transmission mechanism.  

Wi-Fi 6 enables access points to support more users in dense environments and provides a superior experience over normal wireless local area networks. In addition, it delivers better-than-expected performance for advanced applications such as 4K or 8K movies, high-density, high-definition collaborative applications, and full wireless office and Internet of Things (IoT). As wireless network technology continues to grow, 802.11ax is also coming to the future with Wi-Fi. 

According to the Wi-Fi Alliance, future wireless router devices will be tagged with Wi-Fi 4/Wi-Fi 5/Wi-Fi 6 instead of the 802.11n/ac/ax protocol. The Wi-Fi 6 logo will also appear on the phone or computer, and the hardware manufacturer will add the Wi-Fi 4/Wi-Fi 5/Wi-Fi 6 icon to the operating system in subsequent system updates. After adding a new Wi-Fi icon, the status column's Wi-Fi icon shows, in addition to the current signal strength, what Wi-Fi the network is running on (like the 4G logo). Allow users to intuitively understand the current network conditions.  

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