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Smart services based on Internet of everything (IoE) are prophesied to reapnotable attention by both academia and industry in the future. Althoughfifth-generation (5G) is a promising communication technology, however itcannot fulfill complete demands of novel applications. Sixth-generation (6G)technology is envisaged to overcome limitations of 5G technology. The visionand planning of future 6G network has been started with this aim to meet thestringent requirements of mobile communication. Our aim is to explore recentadvances and potential challenges to enable 6G technology in this review. Wehave devised a taxonomy based on computing technologies, networkingtechnologies, communication technologies, use cases, machine learningalgorithms and key enabler technologies. In this regard, we subsequentlyhighlight potential features and key areas of 6G. Key technologicalbreakthroughs which include quantum communication, tactile communication,holographic communication, terahertz communication, visible light communication(VLC) Internet of Bio Nano Things, which can put profound impact on wirelesscommunication, have been elaborated at length in this review. In this review,our prime focus is to discuss potential enabling technologies which can developseamless and sustainable network, encompassing symbiotic radio, blockchain, newcommunication paradigm, VLC and terahertz. In addition, we have investigatedopen research challenges which can hamper the performance of 6G network.Finally, we have outlined several practical considerations, 6G key projects andfuture directions. We envision 6G undergoing unprecedented breakthroughs toeliminate technical uncertainties and provide enlightening research directionsfor subsequent future studies. Although it is impossible to envisage completedetails of 6G, we believe this study will pave the way for future researchwork.

A Contemporary Survey on 6G Wireless Networks: Potentials, Recent Advances, Technical Challenges and Future Trends