In this paper, we investigate a more efficient transmissive reconfigurable meta-surface (RMS) transmitter, which is potential to realize the sixth-generation (6G) mobile communication ultra massive multiple input multiple output (MIMO) due to its low cost and low power consumption. Since RMS is passive, it can reduce power consumption while satisfying the high-capacity requirements of 6G networks. For the proposed architecture, we elaborate transmissive RMS transmitter architecture, channel model, channel estimation, downlink (DL) signal modulation, and beamforming design, etc.. Finally, several potential research directions in the future are given.
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