Abstract: The invention relates to a method of and a device for estimating system requirements of a radio telecommunication network (1). In a first step the area of interest is split in geographical regions with regard to their structural environment. In a next step each region is split in homogeneous zones with regard to such parameters as the height of the structures, their height variation, the distribution of the height variation and the type of vegetation. Each zone is further classified with regard to the typical building materials used and information of the system deployment conditions. From the area of each zone a preliminary number of radio access units (2) is calculated using its classification data and the range of the radio access unit (2) in such a zone. Thereafter the number of radio access units (2) of a zone or a group of like zones is examined with respect to the communication capacity required.