Research On Adaptive ABS Configuration And Power Control Alogrithmfor Dense Small Cell Networks

To meet the "1000x Data Challenge",deploying a large number of Small Cells has been introduced by 3GPP in Release-12.That is,based on the existing architecture of the LTE-A heterogeneous network,a large number of Small Cells are densely deployed.Small Cell has brought new opportunities,but also caused new problems and challenges.Intensive deployment of Small Cell can reduce the distance between the user equipment and the base station,so as to effectively increase the user to receive the useful signal to the base station while reducing the path loss and energy consumption,making the network throughput improved greatly.However,with the increase of Small Cell deployment density,the distance between Small Cells becomes short.The co-layer interference between Small Cells is very serious,which limits the further improvement of the network performance.So,it is urgent to use the interference coordination technology to enhance the performance of the densely deployed networks.In this paper,we study the interference coordination technology of the densely deployed networks,where the MacroCell and Small Cells work in the different frequency band,from the two angles of ABS configuration technology and the base station power control technology.The dynamic distributed ABS configuration scheme and the power control scheme based on ABS configuration are proposed.The dynamic distributed ABS configuration scheme conducts the interference coordination by designing ABS for every Small Cell.Firstly,the Interference Matrix is established to quantify the co-layer interference between Small Cells,and then the Small Cell which has great interference to each other isdivided into the same cluster.Finally,the number of ABS and the position of ABS are calculated.The simulation results show that the network throughput is reduced slightly,and the energy consumption of the network is significantly reduced,and the energy effiency of the network is significantly improved.The power control scheme based on ABS configuration conducts the interference coordination by controlling the transmission power of Small Cell in each subframe.On the basis of the dynamic distributed ABS configuration scheme above,a power control algorithm is proposed firstly,and the differential evolution algorithm is applied to search the optimal transmission power of every Small Cell.Finally,the optimal transmisson power is selected by the time domain scheduling strategy for Small Cell in each subframe.The simulation results show that the network throughput and energy efficiency can be improved effectively.