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To improve the system throughput, this paper proposes a networknon-orthogonal multiple access (N-NOMA) technique for the uplink coordinatedmulti-point transmission (CoMP). In the considered scenario, multiple basestations collaborate with each other to serve a single user, referred to as theCoMP user, which is the same as for conventional CoMP. However, unlikeconventional CoMP, each base station in N-NOMA opportunistically serves anextra user, referred to as the NOMA user, while serving the CoMP user at thesame bandwidth. The CoMP user is typically located far from the base stations,whereas users close to the base stations are scheduled as NOMA users. Hence,the channel conditions of the two kind of users are very distinctive, whichfacilitates the implementation of NOMA. Compared to the conventional orthogonalmultiple access based CoMP scheme, where multiple base stations serve a singleCoMP user only, the proposed N-NOMA scheme can support larger connectivity byserving the extra NOMA users, and improve the spectral efficiency by avoidingthe CoMP user solely occupying the spectrum. A stochastic geometry approach isapplied to model the considered N-NOMA scenario as a Poisson cluster process,based on which closed-form analytical expressions for outage probabilities andergodic rates are obtained. Numerical results are presented to show theaccuracy of the analytical results and also demonstrate the superiorperformance of the proposed N-NOMA scheme.

On the Outage Performance of Network NOMA (N-NOMA) Modeled by Poisson Line Cox Point Process