Aside from all the work being done on pre-5G and full 5G, in a great rush, there are important developments in the 4G spectrum sharing area as well, both to allow Long Term Evolution sharing and sharing of Wi-Fi and LTE.
As you might expect, the amount of jockeying for position is intense. At least three different protocols for supporting LTE sharing with Wi-Fi are pushed.
License-Assisted Access (LAA) is a version of LTE-U specified in release 13 that includes Listen Before Talk (LBT) protocols to ensure WiFi and LTE can coexist. It is mandated in the Europe and Japan, but not the United States and some other markets.
MuLTEfire is a protocol developed by Qualcomm that doesn't require a licensed anchor channel, so that venues or cable companies without licensed spectrum, also can deploy LTE-U.
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