Research On The Interference Management Of Heterogeneous Network

In order to meet the stringent requirements of 5G,a variety of new technologies,such as software define network,massive MIMO,Heterogeneous Network,are proposed.Heterogeneous network is one of the promising solutions to enhance the system capacity and rate,which is attracting great interest in academic circle.Compared to the traditional homogeneous network,heterogeneous network introduce a new type low power micro-cell base station(LPN)which are deployed overlaid on the coverage area of the macro base station to extend the macro's coverage and balanced the traffic load between the macro cell and micro cell.However,owing to the low power,the LPN may be easily interference by the macro cell when they are deployed in same spectrum.The interference is one of reason which degraded the performance of the Het-Net,so the research of the interference management for Het-Net is significance to improve the network environment and performance.The main work of the paper is to make different interference management for different Het-Net scene,which is summarized as follows:(1)A interference management strategy based on enhanced learning is proposed.This strategy is mainly to coordination the interference between the macro cell and micro cell.The strategy put the power control in the micro cell rather than the macro cell,with the reference to the idea of the ABS or LP-ABS,which can effective protected the performance of the macro cell.As the same time,the micro cell can use the Q-learning to accomplish the self-configuration of the parameters,such as the ratio of the HP-ABS,the ratio of the power control.In contrast to the traditional strategy,this strategy can improve the micro cell's throughput,with the guarantee the macro cell's throughput and not taking the global variables into consideration.(2)A interference management strategy used for the mobile micro cell is proposed.The strategy will be construct the interference relation graph based on the mobile micro cell's interference relation and their traffic load.Then,the resource allocation will be executed based on the graph.To deal with the change of micro cell's interference relation which is rapidly changed by the mobility,the strategy introduces the interference graph before the period of resource allocation.Meanwhile,the strategy will use the CoMP transmission while detecting that the interference is from the macro cell.It can greatly enhance the performance of mobile micro cell.The simulation results show that the propose strategy can coordinate the interference between the micro cell and micro cell,increase the throughput of the system.