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DTC is a technical system that reflects the raw channel fading states andvariations in a digital form at the virtual space, to actively adapt to novelcommunication techniques of the wireless communication system (WCS) at thephysical or link level. To realize DTC, in this article, the concept andconstruction method of the radio environment knowledge pool (REKP) is proposed,which possesses the advantages of being controllable, interpretable, renewable,and generalized. Concretely, it is a collection that represents the regularpattern representations and interconnections between propagation environmentinformation (PEI) and channel data. It also has the ability to update knowledgebased on environment changes, human cognition, and technological developments.Firstly, the current state of knowledge-based research in the communicationfield and that for acquiring channel knowledge and achieving DTC aresummarized. Secondly, how to construct and update REKP to conduct keycommunication tasks is given. Then, the typical cases with extensive numericalresults are presented to demonstrate the great potential of REKP in enablingDTC. Finally, how to utilize REKP to address key challenges in implementing DTCand 6G WCS are discussed, including interpretability and generalization of DTC,and enhancing performance and reducing costs in the 6G WCS.

Towards 6G Digital Twin Channel Using Radio Environment Knowledge Pool