Research And Development On Wireless Transmission-based Public Transport Vehicle Media Asset Management Systems

As the continuous development of the new media technology for public transport mobile media, the good social commonweal value and huge market value of the mobile media in public transport vehicle are concerned by the public transport system of cities. Because of the high cost of the traditional TV signal equipment and operation, the public transport system of small cities widely uses media player system based on embedded devices, which updates programs by replacing card manually. However, due to the large number of buses and routes, there are several problems in this method, such as the low efficiency of program updating and the complex steps of program editing, which limits the further development of the mobile media in public transport vehicle in small cities. The research and development of a scientific public transport vehicle media asset management system can help us to raise the efficiency of editing and updating for programs, and satisfy actual requirements of public transport system for small cities. It has realistic meaning.Against this application background, this paper develops a wireless transmission based public transport vehicle media asset management system by analyzing the requirements from the aspects of function, use cases and performance. This system integrates the existing resources of public transport media, optimizes program editing by adopting an intelligent grouping algorithm with the view of programs for raising the program editing efficiency, and presents a scheduling strategy of bus wireless data transmission based on Wireless Fidelity (WIFI), which improves the program updating efficiency and reduces the power consumption. Using this system helps to solve the problems in program editing and updating. This system has a great practicability and the generalizing value. The main work and contribution of this paper are listed as below:Firstly, the significance of this thesis is presented together with a brief summary of the present research status.Secondly, according to the feasibility analysis and requirements analysis of system, this paper presents the goal of overall design for the system and describes the responsibilities of various levels and the distribution of each function module from the view of hierarchical structure and module design. After introducing the implementation of database and function module, the intelligent grouping algorithm with the view of programs is elaborated at last.Thirdly, this paper proposes a scheduling strategy to reduce the cost of power and the time of transmission in the bus wireless data transmission based on Wireless Fidelity (WIFI). The strategy models a solution by applying genetic algorithm to obtain a bus sequence which satisfies the scheduling process. Our simulation results demonstrate that compared with the traditional First Come First Served (FCFS) policy, the proposed scheduling strategy performs much better by saving 16.8% power cost and reducing 38% high priority data transmission time.Lastly, the whole thesis is summarized briefly, and some suggestions are given to help further improvement of the whole system.