Study on risk assessment and factors ranking of the LTE-M communication system  

作　　者：Xiaochun Wu Yu Gao Weichao Zheng 

机构地区：[1]School of Automation Electrical Engineering,Lanzhou Jiaotong University,Anning West Road,Lanzhou 730070,Gansu,China [2]Communication Center,Tianjin Rail Transit Operation Group Co.Ltd,No.36,Xuefu Industrial Park,Tianjin 300000,China

出　　处：《Transportation Safety and Environment》2023年第4期45-57,共13页交通安全与环境（英文）

基　　金：supported by grants from the National Natural Science Foundation of China(Grant No.61661027);the Gansu Provincial Department of Education:Excellent Postgraduate‘Innovation Star’Project(Grant No.2022CXZX-619).

摘　　要：To assess the operational safety risk of long-term evolution for the metro(LTE-M)communication system more accurately,the guide maintenance strategy,the improved evidence theory and the multi-attribute ideal reality comparative analysis(MAIRCA)approaches are proposed.According to the features of LTE-M system,the risk evaluation system is established.The enhanced structural entropy weight method is used to obtain the weight.Furthermore,it is combined with nine-element fuzzy mathematics to transform the degree of membership,modifying the conflict and fusion rules to solve the confidence degree clashed problem of evidence theory.Then,the system risk grade assessment result is obtained.For the purpose of forming the ranking of indicator importance,the MAIRCA is introduced and the ranking is three-dimensional.The operational state of the metro line is used as the data source in various ways the obtained risk grade increased by 7.12%.It is verified that MAIRCA can be applied to the field of urban rail transit because it has based on the test and calculation.The results show that the method is effective;compared with others,the confidence degree of excellent stability and the ranking result of risk factors is reasonable.The influencing indicator with the highest importance is the'equipment failure rate".

关 键 词：long-term evolution for the metro(LTE-M)system operational safety risk assessment improved evidence theory multi-attribute ideal reality comparative analysis(MAIRCA)method 

分 类 号：U231.7[交通运输工程—道路与铁道工程]