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In this paper, we propose a cognitive radio-inspired rate-splitting multipleaccess (CR-RSMA) scheme to assist semi-grant-free (SGF) transmissions in whicha grant-based user (GBU) and multiple grant-free users (GFUs) access thebase-station (BS) by sharing the same resource block. Using the cognitive radioprinciple, the GBU and admitted GFU are treated as the primary and secondaryusers, respectively, and rate-splitting is applied at the admitted GFU torealize SGF transmissions. The admitted GFU's transmit power allocation, targetrate allocation, and successive interference cancellation decoding order at theBS are jointly optimized to attain the maximum achievable rate for the admittedGFU without deteriorating the GBU's outage performance compared to orthogonalmultiple access. Due to the extended non-outage zone, CR-RSMA-assised SGF(CR-RSMA-SGF) transmissions achieve a lower outage probability than SGFtransmissions assisted by cognitive radio-inspired non-orthogonal multipleaccess. Exact expressions and asymptotic analysis for the admitted GFU's outageprobability are derived to evaluate the system performance achieved byCR-RSMA-SGF transmissions. The superior outage performance and full multiuserdiversity gain achieved by CR-RSMA-SGF transmissions are verified by theanalytical and simulation results.

Cognitive Radio-Inspired Rate-Splitting Multiple Access for Semi-Grant-Free Transmissions