A BDD-based Analysis Method For Wireless Sensor Network Reliability And Competitive Failure

Wire sensor network(WSN)is widely used in military,medical,industrial and other fields.As an important performance index of WSN,reliability is an important factor to ensure the normal operation of sensor network and its function.Especially with the further update of information technology,the complexity of WSN keeps increasing,which increases the failure rate of wireless sensor network and affects the security mechanism,making it more difficult to meet its reliability requirements.In order to analyze the reliability of wireless sensor network,WSN model of one for complex mixed gas detection is described in detail in this paper.As a component in the model,the sensor array uses a star network in its topology,and the sensor nodes can communicate.directly with the receiving device(computer).In the analysis process,the fault tree analysis technique and the binary decision graph algorithm are combined to establish a model for the quantitative analysis of reliability.In order to study the competitive failure problem,this paper first considers the internal competitive failure problem of a single sensor,and then considers the competitive failure problem of external attack and internal factors in the time domain.The competitive failure within a single sensor causes unknown failure between components in model 1.The BDD model is established to analyze its impact on the reliability of the system.Further research applied the WSN model to the body sensor network system(BSNs),in which the trunk nodes were added,forming a probabilistic sexual dependence(PDEP)relationship with the sensor nodes.Foreign interference attack and relay node failure may cause the failure of BSNs system,so there is a time domain competition between transmission failure and probabilistic fault isolation.In this paper,a combined method is proposed to analyze the reliability of wireless sensor network systems with multiple dependencies on transmission failure.