The aspiration is simple - to provide the best possible throughput with the largest possible area, the least latency and interference, and high security. These requirements are becoming more difficult to meet as the number of users increases and networks become more dense. In line with these aspirations, more standards were created, including the latest WiFi 6, or IEEE 802.11ax, and its version at 6 GHz, WiFi 6E announced by the Wi-Fi Alliance.
-OFDMA - Orthogonal frequency division multiple access, which allows for efficient channel sharing to achieve higher network performance and lower latency,
- MU-MIMO - Multi-User Multiple input, Multiple output - allows simultaneous transmission of large amounts of data and support of a greater number of devices by access points,
- TWT - Target wake time - allows you to increase network efficiency and save power,
- 1024-QAM - 1024 quadrature amplitude mod ulation mode - a modulation mode allowing for even better use of the spectrum for coding larger amounts of data, increasing throughput,
- Transmit beamforming - beamforming allows to achieve even faster data transmission within a specific range.
- Channels with a width of 160 MHz - higher efficiency, lower latency,
The combination of these standards with a perfected, certified device can allow to reach throughput of even 10 Gbps, what with the standard for Wi-Fi 4 speed of 300 Mbps or WiFi 5 of 1 Gbps can make an impression.
The problem gained in importance when there was a need to use channels with a width of 80 or even 160 MHz, which are not available in the 2.4 GHz band, and in the 5 GHz band - only 6 x 80 MHz, 2 x 160 MHz, and without DFS - 2 and 0. The use of 1200 MHz band allows to divide the system into as many as 7 channels with 160 MHz, 14 - 80 MHz, 29 - 40 MHz, or as many as 59 - 20 MHz. It translates into high capacity, where problems with congestion are solved in a flash. Access points do not compete for the spectrum, they just choose available free channels. Wider channels allow higher throughputs, which in optimal situations allows to achieve multi-gigabit wireless connections to the end user. Additionally, the 6 GHz band is to be reserved only for devices supporting 802.11ax standard, including OFDMA, MU-MIMO, 1024 QAM, which will allow to achieve minimum latency of < 1 ms.
The latest devices were presented at CES 2021 in January. These are not only routers, but also mobile devices or network cards supporting the latest wireless transmission technologies. The first certified WiFi 6E devices appeared on the market already at the beginning of 2021, just after the approval by WiFi Alliance. These include the world's first smartphone supporting WiFi 6E - Samsung Galaxy S21 Ultra with Broadcom BCM4389 chip on board or routers from Linksys, Asus and TP-Link. Also on the Polish market there are available devices that support Wi-Fi 6E standard. Depending on the region of the world and available frequencies, the capabilities of the devices may vary. However, they provide extremely good throughput and link parameters in many cases comparable to those available so far only through wired solutions.
Many network development experts say that 2021 will be the year of Wi-Fi 6E.