Research And Application Based On LoRa Wireless Sensor Network

With the development of the Internet of Things technology,a large number of devices access the network wirelessly,which brings many challenges to the wireless sensor network technology.On the one hand,the coverage of wireless sensor networks continues to expand,requiring reliable long-distance wireless communication transmission technology;on the other hand,the increased capacity of network nodes and the imbalance of data transmission requirements require efficient use of valuable channel resources.If a short-range wireless communication transmission technology such as Zigbee,Bluetooth,WiFi,etc.is used to establish a wireless sensing network with a wide coverage,a routing structure must be added.However,the addition of routers complicates the network topology,making it difficult to build and maintain the entire network.In response to the above problems,this thesis designs a wireless sensor network based on LoRa.The advantages of effective long-distance transmission using LoRa communication technology,coupled with the star network topology,significantly improve the coverage of wireless sensor networks.Time division multiple access technology is an effective method to improve channel resource utilization.Two key parts of the technology are clock synchronization and time slot allocation.Aiming at clock synchronization,this paper designs an improved TPSN algorithm and adds a clock self-correction mechanism to effectively improve the shortcomings of the traditional TPSN algorithm and the network clock synchronization period is not fixed.For the time slot allocation,this thesis proposes a collision-free dynamic TDMA time slot allocation algorithm by improving the TDMA algorithm,which effectively improves the channel resource utilization.Finally,the effectiveness of the improved clock synchronization and time slot allocation algorithm is verified by software programming on the STM32F103RCT6 + SX1278 hardware platform.In summary,the improved clock synchronization algorithm and time slot allocation algorithm can improve the channel resource utilization more effectively,and provide a new idea for constructing wireless sensor networks.The subsequent research will further explore the real-time problem of data transmission.