Joint Deployment of Macro- and Microcells in UTRAN FDD Networks

In recent years, the WCDMA radio network performance has been studied with the focus on deployment of sectorized macrocells. The macrocellular layer will be enhanced by microcell base stations within the next two years. As the class of micro-FDD Node Bs differs in some important aspects from typical macro Node Bs, it is of interest to investigate the impact of these differences and to study effective means of network optimization. To this end, we first analyze the mutual interferences between macroand microcells and show how they affect the joint capacity of both cell types. Next, system-level simulations are performed to demonstrate the influence of various parameters such as the admissible uplink load and common channel power as well as antenna patterns and their downtilt. Finally, a case study comprising realistic site positions and propagation data is performed for verification of the general results.