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

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.