Truly Grant-Free Technologies and Protocols for 6G
MA Yihua1,2, YUAN Zhifeng1,2, LI Weimin1,2,LI Zhigang1,2
(1. ZTE Corporation, Shenzhen 518057, China;
2. State Key Laboratory of Mobile Network and Mobile Multimedia Technology, Shenzhen 518057, China)
The further integration of telecommunications and industry has been considerable and is expected to bring significant benefits to society and economics in 6G. It also forms some evolution trends for next-generation communication systems, including further rises in machine-type communications (MTC), uplink-dominated systems, and decentralized structures. However, the existing access protocols are not friendly to these trends. This paper analyzes the problems of existing access protocols and provides novel access technologies to solve them. These technologies include contention-based non-orthogonal multiple access (NOMA), data features, enhanced pilot design and successive interference cancellation (SIC) of diversity. With these key enablers, truly grant-free access can be realized, and some potential modifications of protocols are then analyzed. Finally, this paper uses massive and critical scenarios in digital transformations to show the great necessity of introducing novel access technologies into future communication protocols.
decentralization; digital transformations; future access protocols; MTC; uplink