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WiFi 6 Promises Much More than Faster Speeds
WiFi 6 increases the network connectivity, and has been developed to ensure the trillions of devices connected in the near future continue to work seamlessly and efficiently. Though it was certified in 2019, it faced a few challenges in testing due to the pandemic. This article gives an overview of this technology.
The next-generation standard in WiFi technology, termed ‘WiFi 6’, is also known as ‘AX WiFi’ or ‘802.11ax’. Developed to meet the exponential increase in demand for devices in the world, it can be used for virtual reality (VR) and smart home devices as well. It is an improvement on the current 802.11ac WiFi standard and meets current challenges in terms of capacity, efficiency, coverage and performance.
Researched in 2014, this standard was invented in 2018 and launched by the IEEE High Efficiency WLAN Study Group (HEW SG). It began certifications in late 2019, with Samsung’s Galaxy Note 10 and Ruckus R750 employing this technology. Specified to operate between the 1GHz and 6GHz bands, WiFi 6 focuses mainly between the 2.4GHz and 5GHz frequencies.
In an average household today, nine devices are connected to WiFi. WiFi 6 aims at improving the network rather than boosting the speed for individual devices.
Features of WiFi 6
Multi-user, multi-input, multi-output (MU-MIMO): This communication between routers and multiple devices concurrently. It supports four simultaneous data streams, added to which one user can have a considerable bandwidth of incoming data from a smart router, both on the 2.4GHz and 5GHz frequencies. 1024-QAM: This helps WiFi 6 encode more bits per packet. There is a 25 per cent increase in throughput. Not only does it improve efficiency in high-traffic situations, it also maximises data rates. This is a huge advantage for modern enterprise applications. Orthogonal frequency-division multiplexing (OFDM): This allows four times as many subcarriers and increases speed by 11 per cent. The expanded signal allows for greater simultaneous packet delivery across users. Hence, the wait time between packets and latency is reduced. Increased channel width: The 160MHz channel communication is added to the 80MHz band, thus doubling the channel width. This allows routers to handle more users and provide larger streams per user. Target wake time (TWT): This feature is unique to WiFi 6. It allows each device to independently negotiate wake time for transmission and reception. This helps to increase total sleep time and maximise battery life. TWT enables many additional networking options, especially for IoT devices. Improved security: All WiFi 6 devices will need to include Wi-Fi Protected Access 3 (WPA3). This will lead to encryption of unauthenticated traffic, robust password protection against brute-force dictionary attacks, and superior data reliability for sensitive information with 192-bit encryption. Beamforming: With eight support antennas, beamforming helps to improve data rates, and the range is extended by directing signals towards specific clients at once. It offers a backup for rapidly moving devices that may face issues with MU-MIMO. Beamforming also helps to control transmissions from antennas that cause signals to interfere on purpose. The signal can then be redirected to a new direction.
Devices that support WiFi 6
Until recently, WiFi 5 was the standard used for routers, repeaters, mesh networks and many WiFi clients. WiFi 6 was launched in 2019. There will be some compatibility issues for the earlier devices that supported WiFi 5 — they will be able to utilise the WiFi 6 network but not be able to receive support for the same.
WiFi 6 routers are backward-compatible, and it is better to make sure that the network is ready for that.
WiFi 6 enables lower battery consumption, making it a great choice for any environment, including the Internet of Things (IoT). It reduces unnecessary data activity, and tells devices when to put their data to sleep and when to be active. As a result, unnecessary data activity is reduced, and performance and battery life are maximised.
The Samsung Galaxy Note 10 and Ruckus R750 were the world’s first smartphone and access point certified to support Wi-Fi 6, with the latest generation of the Apple iPhone following suit. The Wi-Fi Alliance has set up its certification programme, and new wireless products hitting the market are expected to start applying for compliance certification. The devices listed below are already WiFi 6 enabled:
- iPhone 11 and after
- Samsung Galaxy S10, S20, Note 10, and Note 20
- Apple computers with M1 processors
- Smart TVs
To take advantage of the improvements in the 802.11ax standard fully, both hardware and software functionalities have to be built on this WiFi technology.
Hardware testing
To unlock the full potential of the latest devices, a WiFi 6 router is needed to run the network. This was an expensive affair a few years ago, but now we have a number of options even for mesh systems, gaming routers, range extenders, and more. The best purchase can be made only when hands-on testing is done. Beating all its competitors, the current king in terms of speed for WiFi 6 routers is TP-Link Archer AX6000. This router was able to transmit data wirelessly at a rate of 1523 Mbps up to a distance of 1.5 metres (5 feet).
One important thing to remember here is that these routers do not magically increase speeds. The theoretical maximum of achieving 9.6 Gbps is unlikely. This high theoretical speed can be split up across a whole network of devices.
WiFi 6 emphasises quality connectivity in areas where connected devices are densely populated. It does not increase the speed of each device exponentially but ensures these operate at an optimum level.
Only the combination of a faster plan from the Internet service providers (ISPs) along with the WiFi 6 router, can fulfil its true potential. The real challenge is for the ISPs, as they need new fibre rollouts to capitalise on this next-gen technology. An important question is: when faster ISP speeds come, will the existing hardware become redundant?
Applications of WiFi 6
Large public venues (LPVs): Stadiums and convention centres are a few of the common areas where thousands of devices connect to WiFi at the same time. WiFi 6 can help to improve attendee experiences, increase customer interactions, and create value-added services like viewing instant replays or ordering food from one’s seat at an event. WiFi 6 allows LPV owners to create new business opportunities. Transport hubs: Public transport stations are also an area where people attempt to connect to the network simultaneously. OFDMA and BSS colouring in WiFi 6 provide the necessary tools needed to overcome this challenge. IoT and smart city deployments: Power efficiencies in WiFi 6 enable IoT devices to go into sleep mode and turn on their transmitters at predefined intervals to prolong field time without much maintenance. Education: Libraries, auditoriums, and lecture halls at college and university campuses have the highest density of WiFi users during the day, and almost no one at night. WiFi 6 is a perfect choice in this situation.
The challenges
WiFi 6 does not promise an increase in speed, but is an upgrade designed to make sure the speeds of our devices within a given range/area doesn’t slow down a few years down the road. There are three major challenges it faces though, which are often overlooked. Improving the functionality of unsupported devices: Even though WiFi 6 is backward- compatible, justice to it can only be done when this technology is used to the maximum. This means devices need to be upgraded each time.
Speed and performance outside the internal network: WiFi 6 can provide excellent connectivity for services like cloud file shares. However, the assets and resources of ISPs can affect speed and performance.
Coverage issues: Transmission and bandwidths are capped according to the regulations prevalent in each country. Hence, the coverage of WiFi 6 may be restricted to ensure this cap is met.
In spite of these challenges, companies like Aruba, Asus, AT&T, Boingo, Broadcom, Cisco, Comcast, CommScope, Cypress, Extreme Networks, Intel, Netgear, Orange, Qualcomm, TP-Link and Xiaomi are all focusing on the potential WiFi 6 has.
（LCTT 译注：选题删除了原文中的相关产品推荐部分。）
via: https://www.opensourceforu.com/2022/06/wifi-6-promises-much-more-than-faster-speeds/
作者：Sharon Katta 选题：lkxed 译者：译者ID 校对：校对者ID