the development of mobile communications in 5g and 6g

Extensive use of communication and information technologies has led to the introduction of different generations of mobile communications. the first to fourth generations (1g-4g) of communication are fully recognized in the world, the fifth generation (5g) is gradually being implemented in different countries, and studies and research on the sixth generation (6g) are in the early stages. the development and deployment of the new generation of mobile communication will have a significant influence on the development and presentation of mobile communications. in this paper, a brief review of the development trend of mobile communication generations with a focus on 5g and especially 6g has been done with respect to the visions, technologies, challenges and issues related to these two generations.