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Rapid growing of mobile communications market, driven by continuous development of new technologies, results in significant increasing of traffic demands. New powerful user's equipment became capable of all functions performed mainly by desktop computers. Therefore, mobile Internet access requires data rates comparable with fixed access networks. 5G concept has emerged to meet these growing demands. Recently, many approaches have been proposed as potential 5G technologies. In this paper, we survey main prerequisites for 5G concept and study key 5G technologies. Possible deployment strategies have been analyzed. Pros and cons of key 5G technologies and complementary technologies have been outlined. Future perspectives of 5G standardization have been explained.