Abstract：Research purposes: GSM-R is designed specifically for the integrated rail communications for digital mobile communication systems, to meet the requirements of train speed of 0 to 500 km/h in wireless communications with better security. GSM-R wireless coverage is an important factor for GSM-R system. The theoretical analyses of wireless coverage of GSM-R system are made for the purpose of guiding design and optimization of the GSM-R network and choosing the sites of base stations and repeaters.
Research methods: The simulation is made to Hata model, and theoretical analysis and simulation verification are made of the latency problem between directive repeater stations.
Research results: Mobile station is farther from the base station, the loss is greater in the communication path. The land form is more complex, the loss is greater in the communication path. The fiber directive repeater and base stations are covered with spatial wave. The covering distance is not more than 3. 2 km. When Fiber directive repeater station is covered in one-way, its covering distance is not more than 6 km.
Research conclusions: To choose a suitable model and transmission delay Hata is favorable to receiving the loss of better dissemination, thus the choice has been determined of the transmission distance and station sites of base station and directive repeater station.
2007, Vol. 24 
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