Justification of the choice of mobile broadband access technology for building radio communication networks of railway transport

The analysis of handover quality in radio communication networks of high-speed railway transport is given. The parameters of the model that affect the probability of successful handover are considered. An analysis of the possibility of using technologies of public networks LTE and private network p-LTE in radio communication networks of railway transport is presented. The analysis is based on an analytical method that determines the dependence of the handover quality on the selected frequency range and the number of subcarriers of the OFDM signal. Possible parameters of public communication networks that can be applied in railway transport are considered and analyzed. It is shown that the current frequency ranges and channel parameters of public communication networks of Russian operators give unsatisfactory results for high-speed trains. It has been demonstrated that at train speeds up to 50 m/s (180 km/h), the bandwidth of the LTE signal should be at least 20 MHz for the frequency range of 800 MHz and at least 5 MHz for the frequency range of 450 MHz. The parameters of LTE bands 1800 and 350 MHz, which are allocated for use in railway transport, have been considered and analyzed. It is shown that for high-speed trains with speeds up to 70 m/s (252 km/h), it is necessary to use a range no higher than 350 MHz. The obtained results can be used to substantiate the technical characteristics of the radio communication network on the railway for trains with different speeds.