关键词: GSM-R, CTCS-3, 交叉并线, 网络优化, 合福高铁, 异常占用

Abstract: Down-direction trains on Hefei-Fuzhou High-speed Railway experienced CTCS-3 communication timeout for many times which resulted in degradation. A step-by-step investigation reveals that such faults occurred in the crossing area of the lines. The monitoring data of CTCS-3 interfaces and the test data of inspection trains regarding the degraded trains are checked, and an in-depth analysis is conducted based on the cell handover principle of GSM-R system. It is determined that the faults are caused by abnormal occupancy of a base station in idle mode that does not belong to Hefei-Fuzhou High-speed Railway. In view of this situation, the transmitting power and the angles of antenna feed lines of the base stations in the crossing area of the railway lines are adjusted. The test results show that after network optimization, the value of the electrical level of the base station of Hefei-Fuzhou High-speed Railway in this area is significantly higher than that of adjacent lines, which can effectively avoid the occurrence of degradation failures caused by abnormal occupancy.

Key words: GSM-R, CTCS-3, crossing and shared sections, network optimization, Hefei-Fuzhou High-speed Railway, abnormal occupancy