If many of the 5G concepts you hear about are familiar, that is because they are familiar, and are part of the evolution of 4G. Developments such as multiple input multiple output radio arrays developed for 4G will be used for 5G. Carrier aggregation (licensed plus unlicensed) and LTE entirely in unlicensed spectrum will be features of 5G.
In other words, even if 5G eventually will emerge as a distinct generation of mobile networks, it will build on 4G.
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