Research On Reliability Of GPRS Data Transmission In High Speed Environment

The railway informatization is the main symbol of the modernization of the railway.Mobile communication network is the basis of each system of railway information,and is the platform of railway comprehensive information transmission.According to the actual situation of railway in our country: the actual situation of large amount of traffic demand for communication business,but the frequency resource is tight.Using GPRS as a data transmission platform for non secure data,this method can make better use of frequency resources and provide a transmission platform for railway information construction.GSM-R is a kind of special railway wireless communication network is the network communication platform of wireless high-speed train inspection,dispatching orders,train control information,the reliability of GSM-R/GPRS data transmission in high speed railway,has become an important topic of concern.This paper focuses on the research of high speed GPRS data transmission reliability environment,analysis of the data transmission process of GSM-R/GPRS high speed integration,through the analysis of Doppler frequency effect on GPRS data transmission shift and cell reselection,the high-speed running environment of cell reselection improvement strategies,provide a basis for the further development of the application of GSM-R/GPRS.This paper is divided into seven parts,the first part is the introduction,introduces the main contents of this topic research status at home and abroad,research significance,research background and research in this paper;the second part is the theoretical part is an overview of the main business of GPRS and its application in railway,is the theoretical basis of this paper;the third part is the high iron the integrated data transmission process based on GSM-R/GPRS,from GSM-R/GPRS for high-speed integrated data transmission characteristics,process and other aspects of the detailed analysis;the fourth part is the impact on the GPRS high-speed data transmission under the environment of the Doppler shift,including the development and the coherence time of Doppler;the fifth part is the research on the length of high-speed GPRS cell reselection and data transmission interrupted;influence of GPRS high-speed data transmission under the sixth part of cellreselection and improvement strategies,including redundant coverage The selection,overlapping area settings,network control,cell reselection,etc.;the last part is a summary and outlook.