  In this paper, we study the integration between the coordinated multipoint
(CoMP) transmission and the non-orthogonal multiple access (NOMA) in the
downlink cellular-connected UAV networks with the coexistence of aerial users
(AUs) and terrestrial users (TUs). Based on the comparison of the desired
signal strength to the dominant interference strength, the AUs are classified
into CoMP-AUs and Non-CoMP AUs, where the former receives transmissions from
two cooperative BSs, and constructs two exclusive NOMA clusters with two TUs,
respectively. A Non-CoMP AU constructs a NOMA cluster with a TU served by the
same BS. By leveraging the tools from stochastic geometry, we propose a novel
analytical framework to evaluate the performance of the CoMP-NOMA based
cellular-connected UAV network in terms of coverage probability, and average
ergodic rate. We reveal the superiority of the proposed CoMP-NOMA scheme by
comparing with three benchmark schemes, and further quantify the impacts of key
system parameters on the network performance. By harvesting the benefits of
both CoMP and NOMA, we prove that the proposed framework can provide reliable
connection for AUs by using CoMP and enhance the average ergodic rate through
NOMA technique as well.
