A study of wireless channel on GSM-R network

GSM-R is a railway communication system based on the GSM technology. With the widely develop of high-speed rail, the GSM-R quality of service (QoS) is becoming much more important than ever. We analyze GSM-R by measuring field coverage and radio field coverage model, deducing the Doppler frequency offset, giving the upper and lower limits of overlap in handover at different speed, and studying the data-transmitting error rate of GSM_R network. We propose that increasing the space of two neighbor cells does not significantly weaken the quality of field coverage, but can reduce the chance of ping-pong handover and other network performance. We also discover that the Doppler frequency is decreasing gradually and the error rate is decreasing shakingly when the train is becoming closer to the base station. All the data we used in this paper is comes from drive tests on JJ-DPL and W-G DPL, China.