Research On The Technology Of Inter-cell Interference Control In TD-LTE

TD-LTE mobile communication system on the user’s communication qualityand data transfer rate has higher requirements over the previous2G and3Gcommunication systems, however, which is not the same with the3G CDMA isthat TD-LTE uses orthogonal frequency division multiplexing multiple access(OFDMA) technology, OFDMA technology uses frequency resource to divide users,it means that only to take up a lot of spectrum resources can meet more usersand high speed data transmission’s demand. The spectrum resources of TD-LTEsystem are limited, in order to improve the frequency resource utilization,full frequency reuse becomes the main objective of TD-LTE mobilecommunication system. Orthogonal Frequency Division Multiplexing (OFDM)technology can solve interference problems within a district, but is uselessunder inter-cell interference in the same frequency. Interferencesuppression technology can effectively reduce the interference to make fulluse of limited spectrum resources and improve cell edge user peak rate onthe basis of ensuring overall throughput of districts, so inter-cellinterference suppression technology draws more attention in the TD-LTEsystem.According to the differences of adopted techniques, Interferencesuppression technique can be divided into interference coordination,interference cancellation, interference randomization, power control andmulti-antenna technology. The multi-antenna interference coordination andtechnologies are the main topics to study in the paper. Interference coordination is mainly to resolve the problem of smallthroughput of users in the edge of the cell due to path loss and influenceof inter-cell interference. Interference cancellation technique candemodulate and remove the signals from the interference cell. Interferencerandomization is to make the inter-cell interference whitening by scrambling,interleaving or other technical means. The article analyzes and studiesinterference suppression techniques adopted by TD-LTE systems and simulatesemi-static soft frequency reuse and interference coordination technologyof inter-cell interference coordination techniques. The simulation resultsproves that the proposed scheme improves the performance to users on theedge.The setting of antenna angle is obviously the decisive role ofinterference between cells, reasonable antenna downtilt programs can reducethe TD-LTE system inter-cell interference effectively. Beamforming antennacan reduce inter-cell interference when it is used at the base station side.The article analyzed the downlink capacity of users in the cell by MIMOTechnical according to the computer simulations, it is verifiede that theMIMO technology can greatly improve the throughput of cells and performanceof users on the edge. A soft frequncy reuse interference coordination schemecombined with DOA beamforming technology will be proposed on the basis ofanalysis and research for beamforming technology, the simulations verifiesthat the scheme also improves the performance of system. The scheme has acertain reference value to the the optimization design of the initial networklayout and network node of TD-LTE system.