  In this paper, we investigate for the first time the dynamic power allocation
and decoding order at the base station (BS) of two-user uplink (UL) cooperative
non-orthogonal multiple access (C-NOMA)-based cellular networks. In doing so,
we formulate a joint optimization problem aiming at maximizing the minimum user
achievable rate, which is a non-convex optimization problem and hard to be
directly solved. To tackle this issue, an iterative algorithm based on
successive convex approximation (SCA) is proposed. The numerical results reveal
that the proposed scheme provides superior performance in comparison with the
traditional UL NOMA. In addition, we demonstrated that in UL C-NOMA, decoding
the far NOMA user first at the BS provides the best performance.
