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Time-domain Inter-Cell Interference Coordination (ICIC) is recognized as themain driver towards efficient and effective ultra-dense network deployments.Almost Blank Subframe (ABS), as key-example of ICIC, has been recentlystandardized so as to achieve high spectral efficiency. As we show in thisarticle, adopting ABS implies non-trivial complexity to be effective inmulticellular environments with heterogeneous cell coverage and user density.Nonetheless, no fairness determinism is guaranteed by ICIC and ABS inparticular. Instead, we analytically show that a compound exploitation of ABSwith outband sidelinks used for Device-to-Device (D2D) communications onunlicensed bands not only allows to abate the complexity of operating ABS, butalso results in unexpectedly high levels of fairness. Based on the analysis, weformulate a convex optimization problem to stochastically make ABS decisionswhile providing proportional fairness guarantees. Our results prove that,compared to a legacy system, stochastically orchestration of ABS largely boostsfairness while retaining a notable throughput gain offered by mmWave outbandsidelinks used for relay.

Fair Stochastic Interference Orchestration with Cellular Throughput Boosted via Outband Sidelinks