Feasibility of a TV whitespaces enabled broadband network for high-speed trains

In this paper we analyze the potential use of underutilized TV frequencies to enable high-speed hotspots and data offloading in trains. We propose a system where the hotspots connect via TV frequencies to base stations that are located at the train stations. Using data from the railway network of Germany and detailed spectrum availability information we carry out a performance analysis for various realistic scenarios and configurations of a secondary system that relies on LTE technologies. Our analysis shows that sustainable data rates beyond 20 Mbps per train can be achieved in all considered scenarios, and that a proposed modified spectrum policy for authorized shared access of the secondary system will yield near-universal coverage. The results show that it would be possible to provide cost-efficient broadband connectivity for a national high-speed train network by using unused TV frequencies.