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wireless fidelity (WiFi)

The term Wireless Fidelity (WiFi or Wi-Fi) stands for a radio network standard and was coined by the Wireless Ethernet Compatibility Alliance (WECA). In principle, the designation WiFi corresponds to that of WLANs as long as they operate according to 802.11 in the 2.4 GHz and 5 GHz frequency ranges. The WLANs or the WLAN components are tested and certified by the WiFi Alliance, they receive a WiFi number and are marked with the WiFi trademark.

WiFi was developed for the mass market, it uses the licence-free frequency bands at 2.4 GHz and 5 GHz and operates according to the standards of 802.11. The WiFi certification and the WiFi number are used for the interoperability of 802.11 products. Users can use the WiFi number to identify whether, for example, 802. 11ac WLAN components are interoperable with 802.11a/b/g/n devices. The WiFi numbering system starts with WiFi 1 at the 1999 802 .11b standard, WiFi 2 represents 802.11a, WiFi 3 represents 802. 11g, WiFi 4 represents 802. 11n, WiFi 5 represents 802.11ac, and WiFi 6 represents 802. 11ax.

WiFi 6 router for 802.11ax from Asus

WiFi 6 router for 802.11ax from Asus

WiFi in a way forms the standard with which the most diverse mobile devices are wirelessly connected to each other or integrated into a WLAN. These can be game consoles or smartphones, tablet PCs, notebooks or multimedia players. The characteristic features and parameters correspond to those of the WLANs used. WiFi is used to set up small-cell WiFi radio networks that are operated in the license-free ISM bands and are designed for voice services and data services and can also be used to make phone calls using WiFi calling. With Real Simultaneous Dual Band (RSDB), there is a special implementation that can communicate simultaneously in both frequency bands, the 2.4 GHz band and the 5 GHz band.

WiFi radio cells with their hotspots can replace femtocells and be integrated into mobile networks as small cells. The WiFi standard allows direct communication between two terminals without an access point (AP), as well as the formation of ad hoc networks or wireless LANs with one or more wireless access points (WAP). The Small Cells in WiFi also have the advantage that the location accuracy becomes very high due to the small cells.

Since the distance range of WiFi is relatively limited, the FCC has designed Super-WiFi, a Wireless Regional Area Network (WRAN), a technique that can bridge distances of 100 km at high data rates.

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Englisch: wireless fidelity - WiFi
Updated at: 30.06.2020
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Translations: DE