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Wi-Fi 6 is the hottest new technology.
According to the forecast of IDC, a research organization, the shipment of Wi-Fi 6 terminal devices will reach 1.6 billion in 2020, mainly from AP (Access Point) and smartphones. The
reason why Wi-Fi 6 has such a good development prospect is due to the breakthroughs in Orthogonal Frequency Division Multiple Access (OFDMA) and Target Wake Time (TWT) technology, which greatly improves the performance of Wi-Fi 6 in terms of network capacity and device-intensive Wi-Fi environments. At the same time, it also supports networking technology equivalent to Bluetooth Low Energy (BLE), expanding the application market of high-speed and low-speed transmission rates.
Mark Hung, vice president of technology and engineering at the Wi-Fi Alliance, said that the main features of the Wi-Fi 6 standard include OFDMA, TWT, Multi-User Multiple Input Multiple Output (MU-MIMO), 160MHz Channels, 8 Spatial Streams and 1024 Quadrature Amplitude Modulation (1024-QAM), among which the most anticipated technologies are the implementation of OFDMA and TWT technologies.
Key features of Wi-Fi CERTIFIED 6
Hung said that the introduction of OFDMA technology means that Wi-Fi networks have reached a milestone of reliability comparable to cellular networks. As long as users are in the Wi-Fi 6 domain, they can be guaranteed to be connected to the Wi-Fi network.
Before Wi-Fi 5, Wi-Fi networks have always provided networking in a best effort manner. Sometimes, in a Wi-Fi environment that seems to have a strong signal, it is impossible to connect to the network, causing users to have a poor experience.
OFDMA technology can ensure that each user can connect to the Internet for a period of time, increase the stability and reliability of the network, and indirectly expand more diverse application scenarios.
In terms of application scenarios, more than 400 Wi-Fi 6 APs were installed at the U.S. Open in June 2019. In addition, Samsung and Cisco cooperated to install Wi-Fi 6 APs at the Ontario Airport in Southern California. Then, a British manufacturer also selected Wi-Fi 6 as the network standard for Industry 4.0 applications under the demand of Industry 4.0, which was used for AR and manufacturing real-time application scenarios.
Hung emphasized that the use of Wi-Fi 6 not only improves the speed of a single terminal, but also improves the speed of the entire network.
From the consumer side, Wi-Fi 5 has achieved a throughput of more than 1Gbps, but it is unknown how fast you can really experience at home or outside.
Basically, every American household now has an average of 50 Wi-Fi terminal devices, which need to be connected to the network from time to time. It is easy to imagine when interference problems will occur.
In addition, TWT technology allows Wi-Fi 6 to support low-power networks and meet new IoT application scenarios.
Hung said that TWT provides a more flexible way for APs and terminals to communicate, such as being able to set the time to wake up the terminal to perform data transmission at any time. Compared to the past Wi-Fi 4 or Wi-Fi 5, which mainly used a regularly scheduled wake-up method, TWT can now wake up the terminal and AP through negotiation according to different application scenarios, reducing power consumption for both parties.
Hung analyzed that the previous Wi-Fi timer power saving method was to wake up the device at a fixed time, perform some transmission, and then sleep.
Of course, this will save power because the device will not always be turned on, but sometimes there may be no content to transmit when the device is scheduled to wake up, causing unnecessary power consumption.
On the contrary, TWT technology is based on the negotiation between the terminal and the network. The two determine the wake-up time based on their needs, reducing power consumption to a minimum, and its low power performance has reached the level of BLE.
Overall, Wi-Fi networks have penetrated into daily life on a large scale. The introduction of Wi-Fi 6 is expected to lead Wi-Fi into new application areas, such as industry, medical care, agriculture or other low-power scenarios, bringing the popularity of Wi-Fi to another level.
*Disclaimer: This article is originally written by the author. The content of the article is the author's personal opinion. Semiconductor Industry Observer reprints it only to convey a different point of view. It does not mean that Semiconductor Industry Observer agrees or supports this point of view. If you have any objections, please contact Semiconductor Industry Observer.
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