Research On Interference Coordination In Heterogeneous Networks Of LTE-A

With the rapid development of mobile communication and the Internet,the demand for data services is increasing.In this business,a large part of the data business is in the room.In order to improve the performance of the user,the LTE-A system introduces a heterogeneous network,that is,the combination of the macro base station and the low power node.Although the heterogeneous network can improve the capacity of the entire network,but the macro base station and low-power node interference problem has greatly affected the user's performance.3GPP organization proposed enhanced Inter-Cell Interference Coordination technique,including ABS(Almost Blank Subframe)technology and RE bias technology,greatly improving the performance of heterogeneous networks.The Macro-Pico Heterogeneous Networks are widly used in realistic scene and the interference questions in it are complicated.In this thesis,taking the typical Macro-Pico Heterogeneous Networks as an example,we study the interference problems in it and aim at solving these problems.The main contributions and innovations are listed as follows.In the Macro-Pico heterogeneous network,the enhanced inter-cell interference coordination technique mainly adopts time-domain interference coordination technology based on almost blank subframe technology and RE bias technology.In this thesis,the modeling of the specific Macro-Pico heterogeneous network is carried out,and the improvement of the interference between the almost blank subframe technology and the RE bias technique in the network is analyzed,and the reasonable ABS mode and RE bias value are given.The analysis work has some reference significance for the RE bias value and the setting of ABS ratio in the actual network scenario.The Pico extension users of the Macro-Pico heterogeneous network are strongly disturbed by the Macro station.To solve this problem,this thesis proposes a scheme combining the Adaptive antenna array technology with the eICIC technology.The simulation results show that the scheme of adding Adaptive antenna array has improved the throughput of Pico extended area users under the premise of ensuring the performance of the whole cell network.