Analysis And Optimization Of LoRa Network Interference Problem

After several years of rapid development,the Internet of Things has gradually become an important information network for people's lives,which has a huge impact on people's lives.As a kind of IoT technology with wide transmission distance and low energy consumption,LPWAN has been widely used in various industries.As one of the most mature LPWAN technologies,LoRa technology is very important in many private and enterprise-level LPWAN deployments due to its long transmission distance,low power consumption,low deployment cost,and working in unlicensed frequency bands.The role.With the popularity of LoRa technology,there are many LoRa terminals in similar areas.When the terminal is normally transmitted,interference problems between the terminals are bound to occur.Therefore,this paper studies the analysis and optimization of LoRa network interference problems.Firstly,this paper studies the mutual interference problem between LoRa nodes.To this end,this paper models the various interferences to the LoRa network using the Poisson clustering process(PCP)and uses the Poisson point process(PPP)to simulate the distribution of non-LoRa nodes.On the other hand,because the difference of the parameter spreading factors will lead to the difference of the transmission distance of the LoRa terminal,this paper divides the distance range of the network covered by the same gateway,and refines the various interferences received by the LoRa node.For the whole network,this paper analyzes the coverage probability of nodes in the network to measure its performance,and studies how the number of terminals affects the regional spectrum efficiency.Measuring trends can reflect the performance of your network.In addition,there is a number of LoRa nodes in each cluster that optimize network performance.Through the analysis,the quantitative relationship between the number of nodes and the interference is obtained,which can provide a good reference for how to reduce the interference.Then,a method for reducing interference between terminals in a LoRa network is proposed.Since there are too many terminals with the same spreading factor in the same area to generate co-expansion interference,the allocation relationship of the spreading factors of each terminal in the unified gateway should be coordinated.In addition,the allocation of time resources and power resources is unreasonable,which also affects terminal transmission.According to the above two principles,the method establishes a comprehensive weighting index of the spreading factor and the transmission time and power according to the initial node number allocation,and after the equalization processing,the new node allocation relationship is obtained in the reverse direction.The simulation results show that this method improves the terminal transmission index extraction rate and can effectively reduce the mutual interference between terminals because the terminal's spreading factor and transmission resource allocation are more reasonably coordinated.