Resource allocation scheme for HetNets with CoMP joint transmission

This paper proposes a joint subchannel and power allocation scheme for the downlink of orthogonal frequency division multiple access (OFDMA)-based heterogeneous networks (HetNets), where the coordinated multipoint (CoMP) joint transmission is supported. We formulate the scheme as a network throughput maximization problem subject to transmit power budgets. An iterative algorithm is first developed to find the optimal solution, which decomposes the subchannel assignment and power allocation in each iteration to reduce computational complexity. Then a greedy-based and an iterative waterfilling-based algorithm are designed, respectively, to solve the subchannel assignment and power allocation subproblems. Simulation results demonstrate that the proposed scheme outperforms other existing works and the iterative algorithms converge within a few iterations.