The increasing demand of wireless communications infrastructure has resulted in the deployment of large numbers of terrestrial fixed service (FS) stations. Moreover, over the last 10 years, the proposals of satellite systems for broadband fixed-satellite telecommunications services (FSS) indicate that a large number of user terminals are intended to be deployed for direct customer access. Frequency planning of such a massive FSS deployment in different bands requires an uncoordinated approach, supported by spectrum sharing studies assessing the risk of interference between the FS and FSS systems and the implementation of mitigation techniques.
In the context of this project, our activity focuses on definition of FSS exclusion zones according to maximum allowed FS interference levels, matching the recommendations established by regulatory and standardization bodies (i.e. ITU, ETSI). Calculation of interference and saturation probabilities over a given territory, are performed to assess the heterogeneous systems spectrum sharing feasibility. This includes the analysis of the satellite to FSS link budget and system characteristics, the FS station deployment specifications, together with the propagation models of interest. Further realistic interference studies are being developed including the real-world geographical information of predefined areas and provision of statistical analyses in terms of FSS deployment characteristics, atmospheric conditions, etc.