Dynamic frequency partition scheme for downlink femto-macro interference coordination

Femtocell is considered as a cost-effective solution to get better indoor services. However, closed-access femtocells in co-channel deployment with macrocells are assumed, potentially serious downlink femto-macro interference may cause performance deterioration of macrocell networks. Especially for macro users nearby femtocell, they will receive serious interference from femtocell, and experience bad service or even being dropped. In order to maintain reliable services of macro users, it is imperative to mitigate femto-macro interference. Frequency partition scheme can avoid femto-macro interference and improve the performance of macro users by restricting femtocell frequency resources. Thus, it is urgent need to study a trade-off between the improvement of macro throughput and degradation of femtocell throughput. In this paper, we focus on maximizing the performance of femtocell network under the constraints of meeting macro-user rate demand. We shall formulate it as an optimization problem and solve it. The simulation results show that the network performance reaches a good trade-off with our proposed frequency partition scheme.