Research On Interference Coordination Scheme For Small Cell In Ultra-Dense Network

As one of the key technologies of 5G,ultra-dense network can greatly increase system capacity by reducing the cell radius and densely deploying low-power nodes.The dense deployment of low-power nodes also makes the network topology more complex,which introduces serious interference problems.It poses a serious challenge to resource management and interference control in wireless network.In order to reduce the interference between small cells in ultra-dense network and improve system throughput,this paper further studies the interference coordination scheme based on the existing interference coordination technology.First of all,this paper briefly describes the current status of 5G key technology research and the challenges.It introduces the definition of ultra-dense network and the concept and classification of small cell.Then it introduces several existing interference coordination technologies for heterogeneous networks,and compares the advantages and disadvantages of existing interference coordination schemes.At last,it leads to the research points of this paper.Secondly,aiming at the problem of co-layer link interference between small cells in ultra-dense network,a time-domain interference coordination scheme based on K-means clustering algorithm is proposed.Aiming at the limitations of the existing interference model in the dense deployment scenario of low-power nodes,the clustering algorithm is applied to the interference analysis of low-power nodes.The scheme uses the Euclidean distance as a parameter to measure the degree of interference.Then it uses the interference generated by the cluster center to the target node to replace the interference of other nodes in the class,and calculates the degree of interference received by the node.Compared with the existing interference model,the model reduces the complexity of the interference analysis and improves the accuracy of the interference model.Finally it converts the system throughput to the interference minimization algorithm,and allocates the time domain resource according to the principle of interference minimization.The simulation results show that the proposed scheme can effectively improve the performance of the ultra-dense network with low complexity.Then,an interference coordination scheme based on power control is proposed to reduce system interference while reducing energy consumption.The scheme establishes a neighborrelationship between nodes by sending an information packet.Then,the interference source node is determined according to the number of neighbor nodes around the central node and the distance from the neighbor node to the central node.Finally,according to the feedback information of the user,a dynamic power adjustment strategy is implemented on the interference source node under the condition that the user is normally communicated.Compared with the traditional power back-off algorithm,the scheme increases the coverage of the small cell without increasing the degree of interference,and improves the system throughput while reducing the system energy consumption.The simulation results verify the effectiveness of the scheme.Finally,the main research content of this paper is summarized and evaluated,and the future research directions are put forward.