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With the evolution of mobile communication technology, the Sixth-Generation (6G) wireless networks will achieve a leap from the internet of things to the internet of intelligent things, meeting higher data demands and broader application scenarios. Novel multiple access technologies and multidimensional expansion techniques will jointly play a role in 6G, providing crucial support for building an efficient, intelligent, and reliable communication network to meet the diverse demands of future communications. Therefore, this review paper aims to explore the application potentials of novel multiple access technologies in multidimensional expansion 6G communication networks. Firstly, it compares traditional multiple access technologies with potential novel multiple access technologies in 6G, with a focus on the advantages of non-orthogonal multiple access technology in improving spectral efficiency and system …