Coexistence server in Cognitive Networks: A real implementation

In Cognitive Networks, coexistence is one of the main issues to be addressed. The release of TV White Spaces (TVWS) for use in various regions of the world presents an opportunity for better spectrum utilization and asks for new techniques of spectrum allocation. The IEEE 802.19.1 standard is designed to address the coexistence of secondary and primary users in TVWS. In this standard, two components are of paramount importance: the Coexistence Discovery and Information Server (CDIS) and the Coexistence Manager (CM). This paper describes a real implementation of a CDIS and a CM for cognitive networks in a central Coexistence Server. Results indicate that, with a coexistence server, it is possible to reduce the overall network interference, even in environments with unmanaged neighboring devices, with a throughput gain for managed and unmanaged devices.