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There is a huge technological advancement in the field of wireless communication in the last few decades. Technology has revolutionized from voice communication to interactive multimedia applications. A tremendous increase in high data rate and connectivity demanding user equipment is observed. There is an immense need for new technological trends to satisfy the cutting edge requirements of 5G and beyond wireless communication networks. Mobility, manoeuvrability, low cost and Line of sight (LOS) communication makes unmanned aerial vehicle (UAV) as a promising candidate for future wireless communication networks. Despite numerous benefits of UAV’s assisted wireless networks several challenges also exist, which need to be addressed. Among those challenges Optimized 3D placement and resource allocation, state of the artwork, solution and future research directions are presented in this article.