  This paper investigates the performance of network non-orthogonal multiple
access (N-NOMA) in a downlink coordinated multi-point (CoMP) system. In the
considered N-NOMA scheme, multiple base stations (BSs) cooperatively serve a
CoMP user, meanwhile, each BS serves additional NOMA users by occupying the
same resource block allocated to the CoMP user. The locations of the BSs and
users are modeled by stochastic geometric models and the interference from the
whole network is considered. Through rigorous derivations, the outage
probabilities achieved by the CoMP and NOMA users are obtained, respectively.
Numerical results are provided to verify the accuracy of the analytical results
and also demonstrate the superior performance of N-NOMA compared to orthogonal
multiple access (OMA) based CoMP scheme.
