Long Term Evolution (LTE) is a mobile communications technology that uses various license-free frequency ranges below 1 GHz, at 1.8 GHz and 2.5 GHz. In the " LTE Unlicensed" (LTE-U) variant developed by Verizon, Qualcomm and other companies and discussed by the Third Generation Partnership Project (3GPP), the license-free 5 GHz range, which is otherwise only used by WLANs
and occupied by WiFi devices, is also included. With the cellular
technology of LTE-U, thedata rate ofmobile networks can be significantly increased over short distances, and without the integration of a WLAN. All the user data flows over the license-free frequency bands
. Since cellular mobile radio technologies normally transmit in frequency ranges subject to licensing, LTE-U shares the frequency range with WLANs, which can lead to mutual interference and increasing interference potential. The coexistence of both technologies, cellular and WLAN, in the same license-free frequency ranges requires rudimentary mechanisms to prevent mutual interference. Other methods that use license-free frequency ranges are LTE-WLAN Aggregation (LWA), Licensed Assisted Access (LAA) and MulteFire.