Channel Characterization for 5G-R Indoor Communication at 2.1 GHz

With the development of the smart railway, new services need to be supported by fifth-generation (5G) technology. Comparing to 5G technology, 5G-railway (5G-R) is more suitable for complex scenarios and strict requirements of rail transit, with the potential frequency band of 2.1 GHz. An indoor server room containing servers and train control systems is a common scenario in the railway system, and its channel characteristics are still to be studied. In this paper, radio wave propagation in a server room at 2.1 GHz is predicted using the raytracing method, and channel characteristics analysis is conducted through the information acquired from the channel model and rays. Electromagnetic parameters of material are calibrated based on the limited measurement to ensure the validity of the model. Different configurations of the 5G-R indoor scenario simulation can refer to this method, which greatly reduces the equipment, time, and human effort required for measurement.