| With economic development and accelerating of people's life pace,people's demand on public transport is growing. However, due to various reasons, our public transport system is not optimistic. Especially in big cities, vehicle increasing,lines extended,trips increasin make the status of road traffic tension more increasingly serious. In this case, intelligent pbulic transportation system has become a major transportation research direction of pbulic transportation field. As the bond of components of intelligent pbulic transportation system, information needs a communication platform to rely on which can run steadily , reliabily and exactly.The paper makes the communication platform as the main object of study and brings forward a data transmission scheme about communication platform based on GPRS, and then designs and implements the communication platform based on the intelligent public transportation system.The paper firstly analyses several wireless data transmission scheme and compares them in the cost of building a network, the transmission speed, the system capacity and application prospects for the market.And thus using GPRS as data transmission network in the intelligent public transportation system.Second,the paper aims at the characteristic of data transmission in the intelligent public transportation system,and then makes a detailed design and description about communication protocols which are applied in the system.The paper mainly introdues the process and the design of communication,and standardizes the format for data transmission and the answer retransmission mechanism,then analyzes and designs the priority for different data.Third, the paper focuses on the study and realization of the communication platform based on GPRS. The paper mainly adopts Socket network programming and multithreading to realize the communication platform.The paper also makes study on non- block,and brings forward a communication platform scheme based on a hybrid of non- block and block. |
PDF Full Text Request