Three-Step Optimization Algorithm in SCMABased System for User Association and Resource Allocation in C-RAN

In this paper, downlink user association, codebook assignment, and power allocation for a Sparse Code Multiple Access (SCMA)-based communication in Cloud Radio Access Network (C-RAN) are interrogated. The main aim of this paper is to accomplish a three-step resource allocation algorithm to achieve the maximum total sum rate subject to SCMA, user association, minimum user power, total available power in Radio Remote Head (RRH), and fronthual constraints with low complexity. To solve the recommended problem an iterative algorithm considering Successive Convex Approximation is utilized. The main problem is separated into three subproblems of user association, codebook assignment, and power allocation. The user association and codebook assignment subproblems are Integer Linear Programming and solved with CVX toolbox. Furthermore, to solve the power allocation subproblem, Successive Convex Approximation with Low Complexity is applied. In the simulation results, the effectiveness of the recommended resource allocation method is shown and compared to OFDMA.