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Semi-grant-free (Semi-GF) non-orthogonal multiple access (NOMA) enablesgrant-free (GF) and grant-based (GB) users to share the same resource blocks,thereby balancing the connectivity and stability of communications. This letteranalyzes ergodic rates of Semi-GF NOMA systems. First, this paper exploits aSemi-GF protocol, denoted as dynamic protocol, for selecting GF users into theoccupied GB channels via the GB user's instantaneous received power. Under thisprotocol, the closed-form analytical and approximated expressions for ergodicrates are derived. The numerical results illustrate that the GF user (weak NOMAuser) has a performance upper limit, while the ergodic rate of the GB user(strong NOMA user) increases linearly versus the transmit signal-to-noiseratio.

Semi-Grant-Free NOMA: Ergodic Rates Analysis with Random Deployed Users