Outage Performance Analysis of RSMA-Aided Semi-Grant-Free Transmission Systems

In this paper, we analyze the outage performance of a rate-splitting multiple access (RSMA)-aided semi-grant-free (SGF) transmission system, in which grant-based user (GBU) and grant-free users (GFUs) base station by sharing same resource blocks. RSMA-aided SGF (RSMA-SGF) GBU admitted GFU are respectively treated as primary secondary using cognitive radio principle. With aid RSMA, GFU’s transmit power allocation, target rate successive interference cancellation decoding order jointly optimized to attain maximum achievable for GFU, without deteriorating GBU’s compared orthogonal access. Taking into account extended non-outage zone achieved rate-splitting, closed-form expression is derived probability considered RSMA-SGF system. Asymptotic analysis also provided. The superior full multiuser diversity gain system verified analytical simulation results.