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In-band full-duplex (FD) communications have been optimistically promoted toimprove the spectrum utilization in cellular networks. However, the explicitimpact of spatial interference, imposed by FD communications, on uplink anddownlink transmissions has been overlooked in the literature. This paperpresents an extensive study of the explicit effect of FD communications on theuplink and downlink performances. For the sake of rigorous analysis, we developa tractable framework based on stochastic geometry toolset. The developed modelaccounts for uplink truncated channel inversion power control in FD cellularnetworks. The study shows that FD communications improve the downlinkthroughput at the expense of significant degradation in the uplink throughput.Therefore, we propose a novel fine-grained duplexing scheme, denoted as$\alpha$-duplex scheme, which allows a partial overlap between uplink anddownlink frequency bands. To this end, we show that the amount of the overlapcan be optimized via adjusting $\alpha$ to achieve a certain design objective.

In-Band Full-Duplex Communications for Cellular Networks with Partial Uplink/Downlink Overlap