A component carrier selection scheme in macro and CSG femtocells co-channel deployment for LTE-Advanced downlink systems

Abstract

In macro and Closed Subscriber Group (CSG) femtocells co-channel deployment, femtocells and Macrocell User Equipments (MUEs) suffer strong interference from neighboring femtocells. The interference seriously degrades MUEs' throughput performance or even causes outage. To solve this issue, we provide a centralized component carrier selection scheme. By globally optimizing femtocells' and MUEs' component carrier selection, the proposed scheme can not only avoid the interference among femtocells and the MUEs' interference from femtocells simultaneously, but also maximize the system spectral efficiency and improve MUEs' throughput performance on this basis. Simulation results demonstrate under high data rate demands the proposed scheme can greatly improve MUEs' performance both in total throughput and outage rate than the classical universal frequency reuse scheme. Furthermore, the proposed scheme can achieve better femtocells' total throughput performance than the hard frequency reuse 1/2 scheme.