By doing so, an 80 MHz channel can be split into multiple Resource Units, so that multiple clients receive different types of data over the same spectrum, simultaneously. With OFDMA, multiple clients are assigned to different Resource Units in the available spectrum. With 802.11ax, a similar multiplexing is introduced in the frequency domain: OFDMA. By doing so, the interference between clients is reduced, and the overall throughput is increased, since multiple clients can receive data simultaneously. MU-MIMO allows the access point to form beams towards each client, while transmitting information simultaneously. In 802.11ac (802.11's previous amendment), multi-user MIMO was introduced, which is a spatial multiplexing technique. ^ MCS 9 is not applicable to all combinations of channel width and spatial stream count.The IEEE 802.11ax standard was finalised on Septemwhen Draft 8 received 95% approval in the sponsor ballot and received final approval from the IEEE Standards Board on February 1, 2021. : qt Other improvements on spectrum utilization are better power-control methods to avoid interference with neighboring networks, higher order 1024‑ QAM, up-link direction added with the down-link of MIMO and MU-MIMO to further increase throughput, as well as dependability improvements of power consumption and security protocols such as Target Wake Time and WPA3. The key feature underpinning 802.11ax is orthogonal frequency-division multiple access ( OFDMA), which is equivalent to cellular technology applied into Wi-Fi. The quadrupling of overall throughput is made possible by a higher spectral efficiency. : qt This also translates to 75% lower latency. While the nominal data rate improvement against 802.11ac is only 37%, : qt the overall throughput increase (over an entire network) is 300% (hence High Efficiency). The main goal of this standard is enhancing throughput-per-area in high-density scenarios, such as corporate offices, shopping malls and dense residential apartments. It is designed to operate in license-exempt bands between 1 and 7.125 GHz, including the 2.4 and 5 GHz bands already in common use as well as the much wider 6 GHz band (5.925–7.125 GHz in the US). It is also known as High Efficiency Wi-Fi, for the overall improvements to Wi-Fi 6 clients under dense environments. IEEE 802.11ax, officially marketed by the Wi-Fi Alliance as Wi-Fi 6 (2.4 GHz and 5 GHz) and Wi-Fi 6E (6 GHz), is an IEEE standard for wireless local-area networks ( WLANs) and the successor of 802.11ac. *: (Wi-Fi 0, 1, 2, 3, are unbranded common usage.
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