Power Allocation for LDM-based Hybrid Multicast Transmission.

The development of non-orthogonal multiplexing (NOM) techniques such as layered-division-multiplexing (LDM) brings opportunities to the evolution of the fifth generation mobile networks (5G). In order to improve the performance of 5G multicast and beyond, this paper proposes an LDM-based hybrid multicast system to take advantage of both Multicast/Broadcast Single Frequency Network (MBSFN) and Single Cell Point to Multipoint (SC-PTM). Specifically, each cell in the network transmits the upper layer LDM signal in the MBSFN mode, while transmits the lower layer LDM signal in the SC-PTM mode. With the aim of maximizing system throughput, we formulate an optimization problem to allocate the transmit power between these LDM signal layers in each cell. Then, to solve the formulated problem, an algorithm based on the concaveconvex procedure is proposed, which guarantees the convergence. Numerical simulation evaluates the performance of the proposed algorithm and LDM-based hybrid multicast, and demonstrates the improvement in system throughput and stream data rate.