Secure Data Dissemination among Multiple Base Stations in High-Speed Railway Network

In recent years, the number of users in High-Speed Rail (HSR) networks has been increasing dramatically, which further leads to the dramatic increment of service data carried by HSR networks. However, the extremely high mobility of high-speed train has brought great challenges to transmit service data with high quality and security. At first, the current researches on data transmission of HSR networks mainly uses the single base station model. That is, each of the mobile users is only able to communicate one base station. Although this analysis method is relatively viable and simple, it ignores the situation where multiple base stations can establish wireless communication links with users. Moreover, eavesdropping is also an important secure problem in wireless communication. However, the secrecy transmission technology has not been explicit researched in HSR networks to improve the security of network transmission. In response to these problems, this paper first abstracts a network model where multiple base stations can be used for wireless data transmission. The secrecy transmission, transmission power and data loss probability are also incorporated into the established model. Then an optimization problem is formulated. By solving the formulated problem, the Secure Data Distribution (SDD) mechanism is proposed. The performance of the SDD mechanism is evaluated by simulation experiments.