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As one enabling technique of the future sixth generation (6G) network,ultra-massive multiple-input-multiple-output (MIMO) can support high-speed datatransmissions and cell coverage extension. However, it is hard to realize theultra-massive MIMO via traditional phased arrays due to unacceptable powerconsumption. To address this issue, reconfigurable intelligent surface-based(RIS-based) antennas are an energy-efficient enabler of the ultra-massive MIMO,since they are free of energy-hungry phase shifters. In this article, we reportthe performances of the RIS-enabled ultra-massive MIMO via a project calledVerification of MmWave Multi-stream Transmissions Enabled by RIS-basedUltra-massive MIMO for 6G (V4M), which was proposed to promote the evolutiontowards IMT-2030. In the V4M project, we manufacture RIS-based antennas with1024 one-bit elements working at 26 GHz, based on which an mmWave dual-streamultra-massive MIMO prototype is implemented for the first time. To approachpractical settings, the Tx and Rx of the prototype are implemented by onecommercial new radio base station and one off-the-shelf user equipment,respectively. The measured data rate of the dual-stream prototype approachesthe theoretical peak rate. Our contributions to the V4M project are alsodiscussed by presenting technological challenges and corresponding solutions.

RIS-based IMT-2030 Testbed for MmWave Multi-stream Ultra-massive MIMO Communications