GSM-R系统的无线覆盖理论分析

Theoretical Analysis of GSM-R System's Wireless Coverage

研究目的:GSM-R是专门为铁路通信设计的综合专用数字移动通信系统,能满足列车运行速度为0～500km/h的无线通信要求,安全性好。GSM-R的无线覆盖是影响GSM-R系统的重要因素,本文从理论上对GSM-R系统的无线覆盖进行分析,从而在GSM-R的设计和网络优化中进行指导,便于基站和直放站选址等。研究方法:对Hata模型进行模拟,并用直放站之间的时延问题进行理论分析和模拟验证。研究结果:移动台距离基站越远,传播路径损耗越大;地形越复杂,传播路径损耗越大。基站与光纤直放站均采用全向空间波覆盖的覆盖距离不超过3.2km。光纤直放站采用单向覆盖时距离不超过6km。研究结论:选择合适的Hata模型及传播时延有利于更好得到传播损耗,从而决定基站和直放站的传播距离和站址的选择。

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 condusions： To choose a dissemination, thus the choice has suitable model and transmission delay Hata is favorable to receiving the loss of better been determined of the transmission distance and station sites of base station and directive repeater station.