The grant-free multiple access technology is regarded as a key enabling technology for future massive Internet of Things(IoT)sce-nario.In the grant-free access system,the lack of scheduling information between the user and the base station brings the problems such as difficulty to identify the active user set and strong interference between users.Hence,the combination of the grant-free multiple access technology and the non-orthogonal multiple access technology can enhance the user interference elimination capability,and furthermore,the powerful data feature extraction capability of artificial intelligence technology can be utilized to optimize the transceiver algorithms of the authorization-free multiple access system,which can effectively reduce the collision probability of the user and enhance the capability of user identification and collision data recovery.The demand,the development,and the state of art of the multiple access technology in the fu-ture wireless communication network are summarized.It is pointed out that in the future,it is necessary to expand access technology for all scenarios and conduct research on the elastic evolution of intelligent technology,in order to support the development of intelligent endog-enous multiple access technology.
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