Interference management in heterogeneous network

Abstract

Inter-cell interference is the main factor influencing performance in future cellular mobile systems. Interference management has become an important issue in system design, especially in heterogeneous networks since interference is more severe. To combat the interference, coordination between cells in heterogeneous network is considered. According to the quality of backhaul link, coordination can be implemented semi-statically or dynamically. By semi-static coordination, time-frequency resources and spatial resources used for transmission are coordinated. To achieve better coordination result, dynamic coordination can be operated if backhaul quality is sufficient. A hybrid approach of semi-static and dynamic coordination is proposed to take advantages of both sides. An efficient algorithm is given to find suboptimal solution to the complex optimization problem for the dynamic part of the hybrid approach. Numerical results are given to demonstrate the effectiveness of the proposed solution.