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Aerial reconfigurable intelligent surface (ARIS), is an intelligentreflecting surface (IRS) mounted by unmanned aerial vehicle (UAV), represent apromising candidate for assisting device to device (D2D) millimeter wave(mmWave) communication in temporal and urgent situations, e.g., open-airevents. IRS can efficiently mitigate the high blockage impact on mmWavepropagation signal in base station to device use case. But, the scenario of D2Dcommunication is different as both the transmitter (TX) to ARIS and the ARIS toreceiver (RX) links are highly susceptible to be blocked due to the low heightof the TX and RX. Consequently, in this paper, the impact of human bodiesblockage on ARIS aided D2D mmWave communication is studied. Firstly, we assurethe effectiveness of using ARIS in this network to significantly enhance itsperformance, then, the effect of ARIS height on the blockage occurrence andsystem performance is investigated to find out the optimum height. Our resultsproves that ARIS highly mitigates the blockage, reduces it by 85%, comparableto the case without it. Moreover, a high increase in system spectralefficiency, 1.2 bps/Hz, can be guaranteed, if ARIS is configured at optimumheight.

The Human Blockage Impact on ARIS Assisted D2D Communication Systems