Research On Two-Level Priority Wireless Sensor Network Polling System For Busy/Idle Nodes

Sensor technology is one of the key technologies of Internet of things.Its application has penetrated into every aspect of daily life,and wireless sensor network is widely applied.As a rapidly-developing field,due to the limitations of the resource of the sensor node itself,the energy consumption and delay of the wireless sensor network MAC protocol are usually the research hotspots.The MAC protocol has two common control mechanisms,namely polling and random multiple access.It has been widely used in the research of wireless sensor network MAC protocol.For the research of wireless sensor network MAC protocol,this paper takes polling control machine as the main entry point.The accurate mathematical analysis of the polling control mechanism is the premise of the theoretical application.According to the different service strategies,the polling system can be divided into three types: threshold,exhaustive and limited.Based on an accurate mathematical analysis of the average queue length and delay of the three service modes,this paper establishes a new polling system model,namely a two-stage priority control polling system that is busy and idle.The central node is a high priority.The level of nodes adopts the full service mode;The common node is a low priority node and uses a busy and idle threshold service.The busy and idle service mode refers to the need to dynamically divide N sites into busy ring subsystems(sites with service requirements)and idle loop subsystems(sites without service requirements)when servers access common nodes.The server only services the sites that have service needs.If there is no service requirement after the service ends,the server will join the queue with no service requirements.Because the priority of the central site is relatively high,each service of an ordinary node that needs to complete a service needs to be transferred back to the central node to serve it and then to an ordinary node that has service requirements.After accurate mathematical analysis of the newly proposed model,the correctness of the mathematical analysis was verified through simulation experiments.Then the newly proposed polling control model was implemented on the Tiny OS platform,and the correctness was verified through experiments.Finally,by setting up a We Chat public account and deploying on the Baidu application engine,the mobile terminal can view the area to be monitored.