Research On Interference Management Of Heterogeneous Networks Based On Time Domain Improvement

In recent years,due to the rapid development of mobile Internet and the rapid growth of urban population,the demand for communication services grows with each passing day,which leads to more and more communication blind zone and hotspots geographically.Just because of this,the traditional way of supplying “blindness” or “hotness” using by Macro base station,not only causes enormous cost pressure for operators,but also causes strong interference among the existing base stations.In the LTE-A system,low power nodes are introduced to form heterogeneous networks,which change the traditional network topology and can effectively improve the throughput of the system.However,as the deployment of low power nodes increases,severe homogeneous and heterogeneous interference occur in heterogeneous networks.This paper focuses on the interference of heterogeneous network in the context of Macro-Pico.The role of Pico station is to make up blindness and hotness,in which Pico for making up hotness can’t achieve the heat up purpose,because of the strong interference from Macro which results in very little access to the user.Even applying CRE can make more users access to Pico,while,as for those users who are within the domain of Pico extension,the serious interference from Macro base station will make the channel quality very poor,and the throughout decrease.Based on this kind of interference existing in heterogeneous networks,this paper focuses on the e ICIC technology based on LP-ABS,and proposes an adaptive configuration of LP-ABS scheme and an interference coordination scheme based on Co MP and LP-ABS.At the beginning of this paper,some key technologies in LTE-A heterogeneous network are introduced,and the interference problems and interference scenes in LTE-A heterogeneous network are analyzed.Then,the CRE technology and e ICIC technology are briefly analyzed,and a heterogeneous network simulation platform is built.In the third chapter of this paper,the LP-ABS technology in time domain e ICIC is introduced,and the user throughput without applying e ICIC and under the combination of LP-ABS and CRE is simulated and analyzed.An adaptive LP-ABS technology is proposed,and the influence of fixed configuration and adaptive LP-ABS technology on system performance is simulated and analyzed in this paper.If only LP-ABS technology is applied in heterogeneous networks,there is still some interference problems to be solved.So,in this paper,a scheme of interference coordination based on Co MP and LP-ABS is proposed.Based on the degree of user interference,this scheme divides the Macro base station,distributes power to users according to users’ Io T value of the central region,transmits cooperatively by applying Co MP technology,and applies the adaptive LP-ABS technology to users in edge region.The simulation and contrast don’t use any interference coordination technology;only adopt the adaptive LP-ABS technology to observe the performance of the system under the combined scheme.Through the simulation results,the combined schemes increase the edge users of Macro base station,users of Pico base station and village throughput,which don’t affect user performance of the Macro base station.