Resource Allocation in Heterogeneous ITCN

Inter-Tower Communication Network (ITCN), which supports communication between different base stations via wireless links, has excellent potential for simultaneous transmission of broadcast data and personalized data using Layer Division Multiplexing (LDM). In this paper, a heterogeneous ITCN architecture using LDM and wireless backhauling is proposed. In downlink transmission, the master base station (MBS) and multiple secondary base stations (SBSs) cooperatively transmit broadcast data using single frequency network (SFN) mode, and the SBSs relay the personalized data from the MBS to users simultaneously. In uplink transmission, the power-limited user devices transmit data to the SBSs, and the SBSs relay the data to the MBS. Considering the co-channel interference, a joint subcarrier assignment and power injection ratio allocation scheme is proposed for downlink transmission in this paper. A mixed integer optimization problem is formulated, and an alternating optimization algorithm (AO) based on game theory and successive convex approximation (SCA) is proposed. Simulation results show the performance of the algorithm under different conditions, and SBSs effectively improve the transmission rate of broadcast and unicast services.