Downlink fluid model of CDMA networks

Classical CDMA models mostly consider hexagonal networks. In spite of their simplicity, the hexagonal networks need complex calculations. We develop an analytical fluid model of the network, simpler than the hexagonal one. It can provide explicit formulas of capacity. As an application of this model, we indicate the densification problem of a UMTS network which means the increase of the number of base stations in a limited zone to satisfy a traffic need.