The 6G massive machine type communication urgently requires new multiple access technology to support random access of mas-sive machine type terminals,and other scenarios in 6G systems also need new multiple access to increase the data rate,reduce transmis-sion delay and enhance transmission reliability.The standardization process of 5G non-orthogonal multiple access and the properties of vari-ous non-orthogonal multiple access techniques are reviewed.The experience in the standardization process is then introduced.The perfor-mance of two new types of multiple access is studied,including sparse interleave division multiple access and unsourced multiple access based on Reed-Muller code.This study can provide useful references for the scheme selection and the standardization of the 6G multiple access technology in the future.
non-orthogonal multiple access6G new multiple accesscompressed sensingsparse interleaver multiple access
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