Abstract: In order to promote the normal use of GSM-R VGCS in railway integrated digital mobile communication system, ensure that under abnormal conditions and emergency situations to deal with the important issues endangering the safety of railway traffic smoothly, implementation principle and implementation technical scheme of GSM-R VGCS was analyzed, and two typical cases of abnormal application of VGCS in railway communication network was combined with, the root cause of the problem that focuses on VGCS flow between GSM-R system and scheduling communication system were mainly studied, and the implementation scheme was optimized and adjusted. The research shows that: by optimizing and adjusting the implementation scheme of VGSC between GSM-R system and dispatching communication system, the abnormal application of GSM-R VGCS under complex conditions such as railway hub or cross bureau area can be effectively avoided.

Key words: global system for mobile communications-railway(GSM-R), voice group call service(VGCS), dispatching communication main system, call organizing, number format