Multiple Access Techniques are expected to be central to achieving IMT-2030 spectrum efficiency targets for 6G, with a new report analyzing power-domain NOMA, Rate-Splitting Multiple Access (RSMA), and Cache-Aided MU-MIMO against established 3GPP methods. RSMA demonstrates significant gains in scenarios with highly correlated channels or power imbalance, while power-domain NOMA effectively enhances bitrates for users with weaker signal conditions. Cache-Aided MU-MIMO introduces a novel interference cancellation approach using receiver-side cached data to efficiently multiplex content like video-on-demand. The study concludes by highlighting limitations in current evaluation methods and calls for further link-level simulations with standardized modulations to support early 6G radio interface design discussions.
Source: https://www.etsi.org/newsroom/news/2633-etsi-issues-new-report-on-multiple-access-techniques-for-6g/
Keywords: NOMA, RSMA, MU-MIMO, spectrum efficiency, interference cancellation