Research On Wireless Network Planning Of LTE-R In Railway Station Area

With the sustained and rapid development of high-speed railway, the second generation mobile communication system of GSM-R which is widely used in the railway communication has been unable to meet the growing business needs on railway. So the GSM-R mobile communications system need to evolve to LTE-R mobile communication system. At the same time, railway station areas in China have wireless network planning problems. The network coverage has blindness and weaknesses, people need to set up new base station to cover the blind and it takes a lot of construction cost. And the unreasonable frequency planning results in the co-frequency interference between base stations, threatens the safety and business effective transmission of railway communication system.In the wireless network planning process, the base station deployment and frequency planning are the two essential problem, they will directly affect the entire wireless network coverage and planning effect. Therefore, the above two issues have been the focus of domestic and foreign scholars. For the base station deployment issues, most research work is built around public mobile communication system. Due to the differences in service level, the business demand in some area of public mobile communication system is low. So in public network base station deployment problem research, most of the planning coverage targets are for the percentage cover met, there is no guarantee that the planning area can realize the seamless full coverage. At the same time, due to the planning area of complex terrain, shape variety, makes the model characterization is very difficult. Therefore, there is little research can be accurate mathematical modeling and treat coverage in the whole demand and seek a balance between energy efficiency solutions. At the same time, according to the serious with frequency interference between base stations, most research work were built around public mobile communication system, poor applicability in railway station area. And for the public mobile communication system frequency planning problem of genetic algorithm convergence effect is not very ideal.In this paper, research work concentrates on LTE-R wireless network planning in railway station area, key research based on distributed base station deployment scheme in LTE-R network architecture and the improved genetic algorithm based on pilot frequency network frequency planning scheme in railway station area. In this paper,the mathematical model of the base station deployment problems has been put forward, energy efficiency as the goal of the optimization problem, and the method of linear approximation, the S-Procedure, SDR are applied to solve the optimization method. Then the simulation tools are used to solving process of the algorithm and the optimal solution is obtained. According to frequency allocation scheme, this paper established a genetic algorithm based on the railway application scenario frequency allocation model, the improved genetic algorithm is proposed. The frequency planning scheme and convergence effect simulation results are shown in the last part.