A Comprehensive Survey on Emerging AI Technologies for 6G Communications: Research Direction, Trends, Challenges, and Opportunities

Technology is now embedded in every aspect of human existence. The demand for technological advancement is increasing day by day for seamless connections. Integrating Artificial Intelligence (AI) into technology will make the future world beyond one's imagination. The field of wireless communication is rapidly changing, and the existing wireless networks need to be improved with the growing data rate. Fifth-generation (5G) networks are now implemented throughout the world, and they meet the criteria of modern technology with higher data rates, improved quality of service, lower latency, and so forth. However, with the changing data rates after ten years, it will become impossible to meet the demand. It is expected that the upcoming sixth-generation (6G) network with the integration of AI will be the successor of 5G, and it will resolve the main issues of 5G, like higher data rates, ultra-low latency, efficiency, and so on. AI in 6G will provide a more secure, reliable communication system than its predecessor generation. This paper presents the use of AI in 6G communication networks, technologies, techniques, trends, and future research directions. It also describes in-depth knowledge of the AI-integrated 6G communication system model. Furthermore, this paper encompasses applications of AI in several technologies, challenges, and significant developments.