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arXiv · 2010.15169

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

Chao Zhang·Yuanwei Liu·Wenqiang Yi·Zhijin Qin·Zhiguo Ding
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Abstract

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

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Chao Zhang, Yuanwei Liu, Wenqiang Yi, Zhijin Qin, Zhiguo Ding. 2020-10-28. Semi-Grant-Free NOMA: Ergodic Rates Analysis with Random Deployed Users. https://arxiv.org/abs/2010.15169

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