Modeling and analysis of dynamic spectrum allocation in high-speed railways

Chinese Train Control System (CTCS) is based on mobile communication, which the key problem is how to support reliability and security of control information transmission to improve track utilization and enhance train safety. In this paper, we firstly propose a control-prioritized Markov approach for dynamic spectrum allocation for high-speed railways wireless communications, which models the interactions between the control transmissions and application transmissions as continuous time Markov chains, we further develop a proportional fairness based approach to optimally coordinate the spectrum allocation of the application transmissions. The simulation results show that the proposed control-prioritized dynamic spectrum allocation approach not only enhances the reliability and security of the control transmissions, but also guarantees efficiency and fairness spectrum sharing among application transmissions.