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Providing connectivity to aerial users, such as cellular-connected unmannedaerial vehicles (UAVs) or flying taxis, is a key challenge for tomorrow'scellular systems. In this paper, the use of coordinated multi-point (CoMP)transmission along with caching for providing seamless connectivity to aerialusers is investigated. In particular, a network of clustered cache-enabledsmall base stations (SBSs) serving aerial users is considered in which arequested content by an aerial user is cooperatively transmitted fromcollaborative ground SBSs. For this network, a novel upper bound expression onthe coverage probability is derived as a function of the system parameters. Theeffects of various system parameters such as collaboration distance and contentavailability on the achievable performance are then investigated. Resultsreveal that, when the antennas of the SBSs are tilted downwards, the coverageprobability of a high-altitude aerial user is upper bounded by that of a grounduser regardless of the transmission scheme. Moreover, it is shown that for alow signal-to-interference-ratio (SIR) threshold, CoMP transmission improvesthe coverage probability for aerial users from 10% to 70% under a collaborationdistance of 200 m.

Caching to the Sky: Performance Analysis of Cache-Assisted CoMP for Cellular-Connected UAVs