Research On Real-time Data Transmission Method In Multi-channel Wireless Sensor Network

Wireless sensor networks are widely used in environmental monitoring,health care and industrial production due to their low cost,low power consumption and self-organization.In some special application scenarios,such as industrial control,data transmission needs to consider not only the reliability of transmission,but also the deadline requirements of data transmission.Therefore,it is of great significance to study the data transmission method with high reliability and low delay.In order to improve the network throughput and reduce the real-time data transmission delay,this thesis study the real-time data transmission method of multi-channel wireless sensor network.The main contents are as follows.(1)In view of the problem that periodic data in multi-channel wireless sensor networks need to be transmitted in real-time before the deadline,a basis for evaluating the urgency of the data flow transmission process is designed,and a flow-based channel and slot coscheduling algorithm is proposed.First,channel allocation is performed according to the network node conflict model and the interference relationship of concurrent transmission to minimize the total number of conflicts between network nodes.Then,the remaining node conflicts are avoided through time slot allocation,and the transmission time slot is allocated to the node where the network data flow is located according to the urgency of the data flow and spatial multiplexing,so as to minimize the data transmission delay.(2)Aiming at the problem that it is extremely difficult for sink nodes to obtain global node information in complex networks,a distributed real-time data scheduling method is proposed from the perspective of local optimization.First,the resource scheduling problem of multi-channel wireless sensor networks is formulated,and the system optimization model is built with the optimization goal of minimizing the number of local network conflicts and maximizing the number of local emergency data transmissions.Then,according to the conflict relationship between the local node data transmission,the most urgent data is arranged to be concurrently transmitted in the current time slot to achieve data scheduling without collision.(3)The real-time data transmission performance of multi-channel wireless sensor network is verified by simulation experiments.The experimental results show that the proposed algorithm can effectively improve network throughput and reduce data transmission delay.