transmitted in GPRS network

The air resource is occupied less when the short message is transmitted in GPRS network compared to the circuit switched domain. Therefore,the former is more proper for the railway mobile communication system whose spectrum is restricted.According to the actual service demands of the XinFengZhen marshaling yard,the multiple reuse pattern technology which can reduce the frequency reuse degree and improve system capacity has been used to plan the frequency.Do the interference performance analysis of the designed multiple reuse pattern frequency plan scheme. The simulation results show that the designed scheme can satisfy the C/I demands of the first order adjacent frequency and second order adjacent frequency of Standards of Ministry of Railways. Water filling power allocation algorithm is combined with the dynamic channel allocation algorithm.Fairness among users has been considered in this new algorithm compared with the existing dynamic channel allocation algorithms based on the base station.The simulation of the system performance according to different channel gain factor and different power allocation algorithms has been done.Simulation results show that system throughput and user dissatisfied probability which are the two indexes measuring system performance are related to frequency reuse degree namely channel gain,the number of users in system and the adopted power allocation algorithms.When the algorithm is used in actual network,the actual network traffic demand and frequency plan scheme should be considered when the value of the channel gain factor and power allocation algorithm have been determined in order to obtain better system performance.Key technologies of radio resource management have been used in marshing yard in order to improve using efficiency of radio resource and increase system capacity which possesses guiding significance for construction of marshaling yard in GSM-R network in the future.