  In this work, we design a generalized joint transmission coordinated
multi-point (JT-CoMP)-non-orthogonal multiple access (NOMA) model for a
virtualized multi-infrastructure network. In this model, all users benefit from
multiple joint transmissions of CoMP thanks to the multi-connectivity
opportunity provided by wireless network virtualization (WNV) in
multi-infrastructure networks. The NOMA protocol in CoMP results in an
unlimited NOMA clustering (UNC) scheme, where the order of each NOMA cluster is
the maximum possible value. We show that UNC results in maximum successful
interference cancellation (SIC) complexity at users. In this regard, we propose
a limited NOMA clustering (LNC) scheme, where the SIC is performed to only a
subset of users. We formulate the problem of joint power allocation and user
association for the UNC and LNC schemes. Then, one globally and one locally
optimal solution are proposed for each problem based on mixed-integer monotonic
optimization and sequential programming, respectively. Numerical assessments
reveal that WNV and LNC improves users sum-rate and reduces users SIC
complexity by up to $35\%$ and $46\%$ compared to the non-virtualized CoMP-NOMA
system and UNC model, respectively. Therefore, the proposed algorithms are
suitable candidates for the implementation on open and intelligent radio access
networks.
