5 G 3.5 GHz and 2.1 GHz hybrid network can achieve wide coverage in downlink low frequency band or up-link enhanced coverage through coordination of high and low frequency networks. Based on the characteristics of high-speed moving

long-distance continuous coverage and high transmission loss in high-speed railway scenes

comparative analysis of 3.5 GHz and 2.1 GHz independent networking and collaborative networking. At the same time

it combines the construction plan of high and low frequency networking engineering and the analysis of access parameter settings

the application of high-low frequency network in the scene of 5 G high-speed railway coverage is discussed.