With the gradual development of radio services and the wide application of wireless communication technologies, the radio environment along railway lines is becoming more and more complicated. Different wireless communication systems inevitably experience mutual signal interference with each other, including intra-frequency, adjacent channel, intermodulation and other types, which can cause wireless system communication interruption, blockage and other system anomalies, and further affect the safe operation of the railway. In this paper, from the perspective of radio environmental factors, the mutual interference between TD-LTE railway private network and FDD-LTE system in the 1785-1805MHz frequency band had been researched, the calculation method of protection zone along the railway line was also given.
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