Spectrum Situation Awareness for Future Railway IoT: Challenges, Opportunities and Key Technologies

Abstract

The heterogeneous network environment in railway Internet of Things networking increases the complexity of network hierarchy "macro-small-micro" multilayer fusion of spectrum resources, and the fast mobility condition in the high-speed railway wireless communication exacerbates the correlation and dynamics of "time-space-frequency" multi-domain coupling of spectrum resources. This article fully considers the impact of high-speed mobile conditions and heterogeneous network environments, and reveals the underlying cause of the poor performance of wireless spectrum opportunistic access of high-speed railways caused by the lack of capabilities in the electromagnetic spectrum space cognition, and proposes our multi-domain / multi-granularity / high dynamic electromagnetic spectrum space cognitive theory based on spectrum situation suitable for future high-speed railways. The article specifies the feasibility, operability and effectiveness of of the spectral situation awareness theory in high-speed heterogeneous environments.