Research On Optimization And Visual Simulation Of TD-LTE Wireless Communication Network With GIS

The construction of a high-quality communication network is the key to guaranteeing network performance and improving user experience.According to the requirements of the 13 th Five-Year Plan of the Communications Department,the current LTE planning and construction goal is to achieve 4G network depth and breadth coverage,that is,the network upgrade optimization phase.The wireless signal propagation model is a key method and a prerequisite for network planning.Even though the classical propagation model has a certain degree of universality,the prediction accuracy for a specific propagation environment is not high.Therefore,the model correction must be combined with the geomorphological characteristics of the study area before it can ensure the accuracy of coverage prediction and play a key guiding role for network optimization.This study is based on network planning and optimization data requirements,taking China Mobile's TD-LTE model as the research object,using DT road test method,collecting a large number of relevant actual data.On this basis,the propagation loss of several classical propagation models in different environments was compared,and the SPM propagation model suitable for the research signal band and propagation environment was selected.The calibration of the SPM propagation model is based on the designed correction principle and calibration procedure.That is,the measured level data is fitted and analyzed by the weighted least squares method to obtain an improved SPM forecasting model with local characteristics and based on the designed verification link.The results of the calibration were evaluated and the results showed that the accuracy requirements were met.Based on the corrected SPM prediction model,link loss calculation is performed for 13 test base stations experimentally studied to obtain the effective coverage radius of each base station cell.Combined with GIS technology,the model parameters and the work of each base station are involved in the electronic map loading of the area.To the network planning software,the wireless signal coverage prediction maps of each base station are obtained.Finally,according to the TD-LTE system network planning and network optimization engineering requirements,the objectivity and rationality of the base station site selection and establishment quantity in the region are verified,and the specific problems of poor coverage and overlapping coverage appear in the region.Optimization advice.The core work of this dissertation is to obtain a large number of wireless signal level values by driving test,and use this measured signal value to perform fitting and correction on the TD-LTE propagation model,thereby providing a theoretical basis for the selection of base station addresses,wireless network parameter settings,and visual simulation of coverage.Support has a certain degree of practical significance and application value for network construction.