Analysis And Research On Interference Coordination Of Heterogenous Cellular Network Based On Femtocell

The emergence of Femtocell has solved the problem of indoor coverage of traditional cellular network.However,the introduction of Femtocell into the traditional celluar network results in serious cross-layer interference.In order to solve the problem,heterogeneous network interference coordination technology has been a hot topic.In addition,frequency distribution and power control have been two important aspects of interference coordination,and are the source and research focus of this thesis.The aim of this paper is to solve the problem of interference coordination of heterogeneous cellular network based on Femtocell.An improved algorithm is proposed for the two main interference coordination schemes: frequency allocation and power control.First of all,the background of the paper is from the following aspects: the related concepts of Femtocell heterogeneous cellular network,the analysis of six interference scenarios which is in the heterogeneous cellular network,and the analysis and research of interference management scheme.Then,in view of the problem that the traditional frequency allocation scheme can not improve the system throughput effectively,an improved frequency allocation scheme is proposed,and a dynamic frequency allocation scheme is proposed based on the partial frequency multiplexing interference suppression scheme.The simulation results show that the improved scheme can effectively solve the cross-layer interference and improve the system capacity.Finally,in view of the disadvantages of the four traditional downlink power control schemes,two improvement schemes are put forward respectively:(1)Power Control A(PCA),the traditional power control scheme can not take into account the users of Femtocell and users of Macrocell,and a new power control scheme is put forward by combining the traditional scheme I with the traditional scheme III through formula integration.The PCA scheme considers the service quality of Femtocell and Macrocell.(2)Power Control B(PCB)is proposed to consider only the interference of Femtocell to Macrocell users.The simulation results show that the scheme takes into account the influence of Macrocell users from Femtocell and Macrocell.