In the context that the existing WIFI frequency band is becoming congested and routing chips are struggling to transmit the vast amount of data we need, a new wireless standard is what everyone wants. Following the existing wifi standards of WIFI4 and WIFI5, researchers have been studying to gradually popularize a new standard, WIFI6 with many great advantages. So what is WIFI6 and what makes it different from the old WIFI standards?
Theoretically, WIFI6 (802.11ax) can use the frequency range from 1GHz to 6GHz with a total bandwidth of up to 1GHz, much larger than the 2.4 GHz (802.11n) standard with a bandwidth of only 20MHz and 5GHz (802.11ac) with a little more bandwidth. Thanks to this, the WIFI6 standard will greatly expand the ability to transfer data and use it more effectively than the existing floor spectrum. At the same time, the new standard will help minimize disturbances with existing services. Professor Maziar Nekovee from the University of Sussex said: “Currently the 6GHz band has been licensed by the FCC (US Communications Commission), and with this band you can operate at 120MHz. The theory is that doubling the bandwidth will greatly improve the data transfer rate. ”
However, in many years of using network-connected equipment, when users leave the router, the transmission speed can drop quite quickly. This is inherently physical effect when a radio or light source emits light in all directions, if the user stands twice as far from the original position, the reduced wave intensity will be reduced by four times. However, WIFI 6 has some tricks to improve this problem, and many of them are geared towards a new generation of mobile carriers, 5G. “These two technologies have a lot in common and learn from each other. The advantage of the 5G network allows a huge amount of input / output, so at broadcast stations, one can set to 64 antennas for 5G network. With WIFI 6, it will have 8 antennas that can support multiple simultaneous users or provide all streams for a small number of users. ”
In addition, we have another solution is OFDMA – orthogonal frequency division multi-access – allowing you to divide each WIFI channel into sub-channels. This is inherently a feature available on WIFI5, but while it only allows 52 subchannels on each 20MHz band, WIFI6 provides up to 234 sub channels. This allows WIFI 6 to effectively divide the bandwidth between multiple users and re-enable unused channels faster for users if they connect.
Another problem that is also being investigated is the ability to “penetrate walls” of WIFI waves. According to basic physics, the higher the frequency, the smaller the wavelength. Small wavelengths are more easily absorbed by surface molecules than wavelengths in the VHF band. This is why for long-range, low-frequency radio communications is a reasonable choice and this also explains that 5G station antennas tend to be closer to each other than to eat. ten’s 4G.
As WIFI and 5G come closer, it’s easy to imagine a future where there is only one data transfer standard without you having to worry about switching between them. At present, WIFI6 standard has been able to operate stably with enough bandwidth to provide a standard household, even when more research is needed to help improve its speed and stability compared to with wired network. But for many of us, when WIFI6 is still something strange, WIFI7 has been promoted by researchers and will be deployed in the near future.