PERFORMANCE EVALUATION OF INTERFERENCE MANAGEMENT STRATEGIES IN 5G HETEROGENEOUS NETWORKS

Abstract

In the rapid growth of the internet, connected mobile devices need ultra-high-speed and high definition multimedia services. In order to meet the demands of the future networks, International Mobile Telecommunication system for 2020 (IMT-2020) indicates that the wireless spectrum resource requirements for 5G wireless networks are primarily a result of the growing demand for system capacity. Due to the increase of mobile data traffic, heterogeneous networks (HetNets) are the promising approach to handle the demand of the recent mobile traffic load. The development of HetNets facilitates subscribers Quality of Experience (QoE) guarantee and higher data rate. However, the interference management is one of the challenges in HetNets due to the coexistence of multiple small cells. In this thesis focus on the capacity and reliability improvement investigation of HetNets deployment using stochastic geometry base station deployment. The simulation result shows that the smaller user densities have higher per-user capacity due to the sufficient available channel resources relative to the user density and smaller interference is resulting from the smaller quantity that a given sub-channel is occupied. As the number of subscribers increases the per-user capacity decreases because the available spectrum resource is allocated to each user. The increment in Pico Base Station (PBS) density causes more interference between picocells and when PBS density is high enough, the receivers in picocells severely suffer interference from neighboring receivers. The area spectral efficiency of picocells is lower while the MU power is high. The outage probability of both uplink and downlink transmissions are increasing as PBS density increases. This is due to the fact that high PBS density causes more interference to the overall network and with higher MU density, the outage probabilities for picocells is high. Finally, when the number of cooperating BSs and transmit power of BSs increases the energy efficiency of the HetNets is decreased while the number of cooperating BSs and transmit power of BSs increases the spectral efficiency of the HetNets is increased