Interference Coordination Technology Research In Ultra-dense Network

Ultra-dense network is the key technology in 5G.Its main characteristic is to deploy a large number of low-power Small base station to shunt Acer base station traffic load in the hot area,and increase the coverage range of macro base station in the "blind spot" area.Due to the rapid growth of the density in the Small base station,there is serious interference in the ultra-dense network and it greatly affect the quality of service for users.In the face of the severe interference in the ultra-dense network.It is focused on the frequency domain,power control and time domain interference coordination technology through analyse the interference management technology in this thesis.There can be found that the frequency domain interference coordination scheme can only use part of the spectrum resources in the dense heterogeneous network and cannot adapt to the increasingly scarce spectrum of the fifth generation of mobile communications.The single usage of power control and time domain interference coordination technology can not adapt to ultra-dense network,too.It need enhanced collaborative scheduling program,a system-level simulation platform is established,including network topology,channel model,functional measurement module and interference management module.Then based on graph theory and clustering of frequency domain interference coordination.It can be found that the frequency domain interference coordination deployment density increases with the base station,network performance will reduce gradually and can not adapt to super dense network;In the analysis of this kind of scheme,we find that the interference coordination solution based on the graph theory ignores the interference accumulation of the cluster in the cluster,the ABS ratio cannot adapt to the large number of iterative times of the network load and differential evolution algorithm.Aiming at the problem of severe interference in the ultra-dense network,the proposed scheme improves an interference coordination scheme which based on the graph-based time domain and the power control interference coordination scheme.The simulation results show that the proposed algorithm is based on the dynamic eICIC and power control.The quadratic iterative algorithm tends to be stable after two iterations.And it is better than the differential evolution algorithm.The network throughput is also improved by 3.1%-77.8% compared with the graph-based interference coordination scheme and the SINR is better than the graph scheme.