Analysis of Handover Model Based on Stochastic Petri Net
Jiancheng Mu · Journal of the China Railway Society · 2009
CTCS(China Train Control System) Level-3 is one of the important parts of CTCS.In CTCS Level-3,GSM-R is the wireless communications system.As a platform to transfer safety data of train control,GSM-R can safely and bidirectionally communicate between train and trackside on real-time basis.For GSM-R,during the processses of handover between cells,the wireless communications have to be interrupted.The safety data have direct effect on train safety,therefore,to ensure the reliability of communications,handover requires shorter time and higher success rate.This paper studies the reliability of communications of safety data in handover,and builds the stochastic Petri Net model to analyze the process.The relation between the train speed and the dependability of handover and the relation between the handover time and handover dependability at 350km/h are given.The CTCS requirements are seen to be met through comparison with the analysis results.