Interference Management And Performance Analysis Of Heterogeneous Cellular Networks With Irregular Deployment

With the rapid development of wireless communication,the traditional cellular network is unable to meet the requirements of the network capacity and speed.Heterogeneous networks with diversification and ultra-density are the hopes of the future wireless deployment.In heterogeneous network,the complicated interference environment becomes one of the main problems which limit the performance improvement of the network,and the distribution of base stations plays a vital role in evaluating the interference in the heterogeneous networks.The regular grid models are highly idealized and intractable,and are not applicable to heterogeneous network anymore.Poisson point process model can reflect the randomness of network nodes,and its good mathematical statistical characteristics provide much convenience for the analysis of network performance.Therefore,this paper uses Poisson point process to model the heterogeneous networks.The expressions which can reflect the network performance are obtained by theoretical analysis.This method avoids the complex system level simulations,and provides a simple and convenient solution for network performance analysis.The main contributions are summarized below:(1)A D2D communication model in cellular network scenario is proposed,and expressions for the coverage probability and the Meta distribution are obtained.(2)In D2D communication scenario,the interference cancellation algorithm is analyzed,and expressions for the coverage probability and the Meta distribution of the interference cancellation technology are obtained.The interference cancellation algorithm is testified by simulation;(3)The model of the enhanced inter-cell interference coordination scheme is established in the Poisson heterogeneous network,and the expression for the spectral efficiency distribution is obtained;(4)A dynamic dual connection scheme for the inter-cell interference coordination enhancement is proposed and applied to the heterogeneous network.Through simulations,it is found that the proposed scheme can increase the transmission opportunities of cell edge users,which leads to a higher average spectrum efficiency of the network.This scheme is more suitable for the scenarios where the low proportion of almost blank subframe is used while load balancing is required.In this paper,several network models with different interference management schemes are established for different scenarios.Furthermore,the expressions of network performance,such as the coverage probability,the access probability distribution function and the spectrum efficiency distribution function,are obtained,which can provide a simple and effective method to analyze network performance without paying huge time and cost in large-scale system-level simulation.