Research On Interference Coordination Between Adjacent Cells In LTE Cellular Networks

The fourth generation 4th(The Generation Mobile Communication,referred to as 4G)came into being with the rapid development of wireless data communication technology and multimedia services.4G is widely used because of its high data rate.As the most scarce resource of mobile communication,spectrum is still the most important factor to hinder the high-speed mobile communication.Therefore,improving the spectrum efficiency as much as possible becomes the key problem to be solved by 4G.At present,4G inter cell frequency reuse factor reached the limit level,the spectral efficiency reaches greatly improved to a certain extent,introduceing a serious inter cell interference(Inter-cell,Interference,ICI),which greatly affect the quality of communication and user experience of 4G.Therefore,in order to meet the requirements of the user's communication quality,as far as possible to reduce inter cell interference has become an urgent problem to be solved 4G.There are many shortcomings in the existing interference suppression techniques,and it is of great significance for the sustainable development of 4G to propose a better interference suppression scheme.Interference coordination technology is highly valued and recognized by the industry.This paper mainly studies the following aspects:Firstly: Explore the interference coordination technology based on FFR(partial frequency reuse).The reasonable division of the cell and the reasonable allocation of the frequency in the frequency reuse scheme are verified based on the simulation model of a mobile communication network with 19 cells.Three performance indexes,including the signal to noise ratio(SNR),the system capacity and the effective coverage rate,were investigated by changing the ratio of the central radius and the edge bandwidth occupancy.According to the simulation results,it is concluded that the interference coordination technology greatly improves the user experience of the cellular mobile communication network.In the actual LTE mobile communication system,it is necessary to consider the distribution and demand of the users in the cell,and allocate the bandwidth resources reasonably to achieve the best system performance.Secondly: Explore the interference coordination technology based on SFR(soft frequency reuse).LTE cellular network system simulation model based on adaptive soft frequency reuse(SFR)scheme 4 typical patterns were evaluated by MATLAB simulation,analysis of the 4 modes of system user SINR,effective coverage rate,comparing the parameters of the total throughput.According to the simulation results,it is concluded that to choose the right working mode when the actual LTE mobile communication system owing different requirements for the user SINR,the effective coverage rate and the total throughput of three kinds of parameters.Thirdly: Improved power control scheme based on SFR soft frequency reuse(SFR)based on the interference coordination technology,combined with spectrum resource allocation algorithm,analysis and comparison of three kinds of transmission power to change the performance of the system.According to the simulation results,conclusion: the appropriate power ratio and frequency reuse scheme combination,can improve the system performance to a great extent,in the actual 4G LTE system should select the appropriate resource allocation and power allocation according to the actual situation,to achieve the best communication effect.