New and old railway intersection GSM-R channel distribution method based on radio propagation model

Abstract

The invention discloses a new and old railway intersection GSM-R channel distribution method based on a radio propagation model, and the method comprises the steps: firstly carrying out the discretization of a new and old railway communication line, and carrying out the propagation path loss calculation of a base station-point of a discrete point through combining with the topographic features ofa base station position and the related parameters of receiving and transmitting equipment; determining a corresponding relationship and a calculated value between the receiving field intensity and all base station points according to a radio propagation model; marking an interference point and recording an interference type according to the calculated value and engineering requirements of the same adjacent channel interference in the GSM-R communication; and according to the interference point distribution and the channel allocation scheme of the existing line base stations, determining the existing line base stations which cause interference to the discrete points of the newly-built line, and combining the interference types of the discrete points to obtain a channel list which can be used on the newly-built line. According to the method, the same-frequency interference, the first-order adjacent frequency interference, the second-order adjacent frequency interference and the third-order adjacent frequency interference are fully considered, the available channel list of the specific newly-built base station is obtained, and meanwhile it is guaranteed that normal communication of an existing line is not interfered.

Description

technical field [0001] The invention belongs to the technical field of railway communication, in particular to a radio propagation model-based GSM-R channel allocation method at the intersection of old and new railways. Background technique [0002] Railway integrated digital mobile communication system (GSM-R) is mainly used for railway communication, occupying a 4MHz frequency band (900MHz-GSM), which has good propagation performance. The loss in the harsh electromagnetic environment is less, and this frequency band has strong anti-interference ability. However, the spectrum resources where GSM-R is located are extremely scarce. The country allocates 4M bandwidth for the system uplink and downlink (uplink: 885–889MHz, link: 930–934MHz), which can be divided into 21 channels, and their numbers are 999-1019 . Ideally, in order to reduce the interference between carrier frequencies, sufficient guard intervals are required between carrier frequencies. There are only 19 chann...

AI Technical Summary

Problems solved by technology

The above three communication coverage methods are often used in the channel allocation process of a single line. When the lines cross or converge, the existing communication coverage methods cannot effectively allocate channels in the intersection area, which affects the normal operation of the train.