Abstract
Both heterogeneous networks (HetNets) and multicasting are key technologies for 5G wireless systems. In this paper, we investigate the joint resource allocation scheme for multicasting in HetNets. The objective is to maximize the system throughput achieved by multicast users subject to the transmit power budgets of BSs. We mathematically formulate the resource allocation scheme to an optimization problem with nonsmooth objective. We first transfer the nonsmooth objective function to an equivalent constraint, and then decompose the problem to subchannel assignment as well as power allocation subproblems to reduce the complexity. Algorithms with lower complexity are developed to find suboptimal solutions of these subproblems. Simulation results verify that our resource allocation scheme achieves higher multicast throughput than existing schemes and the iterative algorithms converge rapidly.
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