Press release
108KB
ottobre 30, 2020 - Siemens
Boost in efficiency with Wi-Fi 6 – New WLAN standard makes it easier to handle large numbers of participants
Comunicato Stampa disponibile solo in lingua originale.
The WLAN standard IEEE 802.11ax (Wi-Fi 6) and 5G are driving wireless mobile communications in the industrial environment forward. #siemens supports both technologies in order to offer optimal solutions for the most diverse requirements. In particular Wi-Fi 6 is the first WLAN standard to no longer mainly focus on greater bandwidth, but on the more efficient use of frequencies by each individual client as the number of participants increases.
The trend in automation is towards automation protocols with hard real-time requirements that are operated in parallel with data-intensive applications. To operate all applications trouble-free via a wireless connection, extensions to the mechanisms already existing in the standard are needed. To not only use the possibilities of the new standard, but to go beyond it and create real added value in automation with regard to real-time and reliability – that is exactly the aspiration #siemens is already implementing with Industrial Wireless LAN and will also be implementing with the latest WLAN standard IEEE 802.11ax (Wi‑Fi 6).
New way of data transmission
Especially in the end-to-end digitalized factory with more and more Industrial Internet of Things (IIoT) devices the number of participants in wireless networks continues to rise, and with it the need for even more flexible, efficient communication. For this, Wi-Fi 6 brings a series of high-performance functions that can be expanded. A major step towards higher efficiency is made possible by the OFDMA (orthogonal frequency-division multiple access) function, a method of data transmission already established in mobile communications but new for WLAN. With OFDMA, the communication channel is divided into multiple subchannels, so-called resource units (RUs). These subchannels can be variably bundled and used by different clients. In this way, data can be transmitted simultaneously. This can reduce latency and ultimately lead to shorter cycle and response times for automation solutions.
Precise addressing of clients
Another new function of Wi-Fi 6 enables a defined target wake time (TWT) to be stipulated for each participant so that clients are only addressed and “woken up” when necessary. The clients thus use less energy, which can result in longer runtimes and maintenance cycles for battery-powered WLAN devices. In complex systems, however, the more important aspect is that “sleeping” participants do not transmit and thus do not occupy the communication channel. This in turn facilitates the planning and coordination of large numbers of participants and more easily leads to a stable, interference-free communication.
Use channels optimally
The new standard function “Spatial Reuse with Basic Service Set (BSS) Coloring” aims to reuse channels that are spatially closer together. To this end, a color (in form of a number) is assigned and a dynamic channel release threshold defined for each BSS. As a result, the participants can communicate reliably even if the channel is in fact occupied by participants of another color, but they are transmitting with a lower power. This eliminates the waiting times for a free channel, and the channels can be reused more efficiently.
Infobox
WLAN is short term for "Wireless Local Area Network" and Wi-Fi (Wireless Fidelity) is one of the most common wireless technologies. 5G is a mobile communications standard that has been gaining popularity since 2019. It is based on the existing "Long Term Evolution" mobile wireless standard.
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