A position-based access scheme for high-speed railway communications

The fast deployment of more than 300 km/h high-speed railways has spread all over the world. Providing high quality of service of multimedia applications for users in the high-speed train remains a challenging issue in wireless communications. The key is to ensure seamless handovers in the train communications. In this paper, a position-based access factor is therefore proposed to balance performance metrics of the handover call dropping probability, the new call blocking probability, and the system resource utilization. This scheme utilizes the high-speed train position and speed information and the high-speed railway communication scenario to assist access control. In addition, different multimedia application types are considered. Simulation results show that the proposed scheme may improve the quality of service of multimedia applications compared with schemes that do not apply the access factor.