Abstract
In this article, we review the evolution of radio access networks and introduce fifth generation (5G), based on the current plans and expectations, as reported in the 2017 Ericsson Mobility Reports. Standardization is an ongoing effort, and much industry research is devoted to finding a good match of requirements, including balancing system performance, flexibility, and implementation implications. We present standardization activities, including over-the-air (OTA) testing. Examples are given from both academia and industry, where millimeter-wave (mm-wave) and array antenna systems are explored and their suitability for 5G is investigated.
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