Research On Edge Scheduling Strategy Of 2.4G Wireless Monitoring Network

At the edge of the wireless network,there are often applications where a master node collects data from multiple slave nodes(sensor nodes),such as monitoring occasions.Being able to collect data quickly in real time is often a basic requirement of this kind of system.However,Bluetooth 5.0 working in the 2.4GHz band has two obvious shortcomings when applied to the above-mentioned real-time environment:(1)When multiple scanning nodes request to connect with the broadcast node simultaneously,which scanning node can get the opportunity to connect first is a random event.Sometimes the node with a lower priority may get connected first.(2)Even if there is only one scanning node waiting for the broadcast packet,the connection time between the scanning node and the broadcast node is uncertain,especially when there is an interference signal.The above two shortcomings greatly limit the real-time application of Bluetooth 5.0.Aiming at the deficiencies of Bluetooth,this thesis adopts the frequency hopping mechanism and the time slot allocation mechanism,and proposes a transmitting six synchronizing pulses continuously(TSSPC)network access strategy.The corresponding network is called the TSSPC network.Its main work is as follows: First,a theoretical analysis of the principle of transmitting six synchronizing pulses continuously is given,which not only provides a detailed proof,but also verifies the theoretical correctness of the network access strategy through design expe riments.Then the thesis use experiments to simulate the working mode of Bluetooth and compare it with the TSSPC network access strategy.At the same time,it is compared with the experimental results of the Bluetooth node(the n RF52840 Bluetooth chip produced by NORDIC),showing the real-time advantages of the TSSPC strategy,that is,it can overcome the above-mentioned shortcomings of Bluetooth 5.0.Finally,according to the designed TSSPC network sequence diagram,the experiment of real-time data collection and priority response in a multi-node scenario is demonstrated,which shows its practical feasibility.All experimental results show: TSSPC strategy has good real-time characteristics.Not only can the priority scheduling be better implemented,the master node can select important slave nodes to access the network first,and it also ensures that no conflicts occur between all nodes.And when the data can be sent and received normally,under certain circumstances,all the time from the start of synchronization can be determined.These are just important requirements in real-time wireless network applications.