User Access and Resource Allocation in Full-Duplex User-Centric Ultra-Dense Networks

Abstract

User-centric ultra-dense network (UUDN) has become a promising paradigm with the advantages over traditional cell-centric structure with respect to spectrum and power usage. This paper introduces full duplex (FD) technology into UUDN and presents a joint scheme of user access, subchannel allocation and power control for FD UUDN. The scheme firstly judges the feasibility of the constraints of the transmit power and rate requirements. If they are feasible, the total network capacity is maximized under the transmit power constraints. Otherwise, the minimal total power of the network is found to satisfy the rate requirements. The sum rate maximization is solved by multiplicative linear fractional programming (MLFP) based power allocation (MAPEL) algorithm and particle swarm optimization (PSO) algorithm, respectively. The power minimization problem is transformed by averaging the total rate in each subchannel of the user, and then solved by time-sharing method. Simulation demonstrates the enhancement of spectrum efficiency and the reduction of consumed power for UUDN compared with cell-centric UDN. Moreover, the advantage of FD over half duplex (HD) is shown in terms of spectrum efficiency and power consumption.