Research On Key Technology Of Radio Resource Management And Control In GSM-R

With the construction of high speed railway and passenger transport special railway in China, GSM-R digital mobile communication system develops rapidly with many different applications. However, there is only four mega- hertz frequency with many applications, for example, the emergent call in railway, the train schedule, the train control, passenger information service and so on. There are different kings of grade demands in different operations. These operations demand different resources and therefore, we can say GSM-R system is a resource restricted severely system. Simultaneously, there are some problems in this system, for example, frequency interfere, signal deep declination, blind covering areas, big access delay, the high block drop rate and frequently handover Problems. All above problems affect security, dependability and validity of our railway transportation. Meanwhile, Security of GSM-R connects the national economy and the people's livelihood. So wireless resource management and control (RRC) strategy is a base and significant key problem listed above to resolve at the very moment.This dissertation researches and analyzes the de-lamination cover strategy, MRP strategy and the multi-channel resource reservation strategy. The relevant algorithms are proposed based on the platform of MATLAB and Turbo C. Set up a Systemic simulate platform, consider of multidistrict and dynamic call admission. The de-lamination cover strategy can partly solve the problem of frequency shortage in GSM-R. MRP enlarges system capacity by different means of multiplexing, different distance, according to QoS provision requirements. Multi-channel reservation strategy can meet the QoS requirements of railway services based on well forecast. Meanwhile, aiming at the district distribution in double layered network, from the point of the handover and link cost, this dissertation proposes algorithms and simulates on the platform of MATLAB and solves the above problem. At last, aiming at the problem of cover areas arrangement and base station stand choice, this dissertation adopts the approach of combined bipartite graph and Steiner to research. According to the simulation results, this dissertation can provide reference to the future construction of GSM-R system.