Research On Interference Management Technology In Heterogenous Cellular Network

With the quick development of Mobile Internet, mobile data services are growing repidly. Therefore, cellular network should be constantly changed to adapt new requirements. Cellular network introduces new technologies and advanced devices, which results in new challenges and problems. Among them, interference management becomes more complicated. As a result, frequency interference has become an important topic of cellular network.In LTE-Advanced system, low power base stations, D2Ds (Device-to-Device) system and macro cell base stations constitute HCN (Heterogeneous Cellular Network). HCN increases its system capacity by sharing spectrum. But this method causes frequency interference. This paper aims to put forward a scheme of suppressing frequency interference in HCN, meanwhile it provides a guarantee of users’SNR (Signal Noise Ratio) and system capacity. The major research content are as follows:Aiming at the frequency interference caused by low power base stations in HCN, this paper raises partial frequency reuse interference management scheme based on self-sensing of low power base stations. This paper also analyzes the cause of interference and summarizes system module in HCN according to the characteristics of co-frequency networking and low power base stations. By simulation, the scheme can effectively suppress frequency interference and provide high spectrum efficiency.Suppressing frequency interference caused by D2D in HCN, this paper proposed a power control interference management scheme. Due to the particularity of mobility in D2D system, this scheme is independent of user’ s location. It maximums system capacity by allocating user’s transmit power which satisfying requirement of SNR for normal communication.