Research On Reliable WSN Transmission Method Based On Link Adaptive Perception

With the development of smart cities and Industry 4.0,wireless sensor network(WSN)has been used more and more widely in various industries.Due to the resource limitation of nodes and the dynamic time-varying of wireless sensor network,reliable data transmission became a main challenge.In the network protocol stack of WSN,the routing protocol palys an important role in the transmission process.Delivering packets with a good transmission path can effectively reduce the impact of link dynamic changes.It's can also avoid data transmission failures caused by node energy consumption restrictions.Therefore,designing an efficient routing protocol can increase the reliability of data transmission.This paper focuses on the study of opportunistic routing and multipath routing.The method designed from routing and coordinated forwarding.The data transmission depends on selecting high-reliability links to achieve the purpose of increasing the data delivery rate.Aiming at the problem of unreliable data transmission caused by fading environment,a reliable opportunistic routing transmission method was proposed in this paper that based on fuzzy logic.The method uses fuzzy logic to define the link quality estimator,and takes into account the Packet Reception Rate,Rignal-to-Noise Ratio and Received Signal Strength Indicator.Although the transmission method of opportunistic routing improves the reliability of data transmission,it also creates the problem of redundant data.This protocol comprehensively considers the end-to-end optimal link quality and geographic location,and realizes the reasonable construction of the forwarding candidate set.The experimental results show that the proposed protocol improves the reliability of data transmission than the existing opportunity routing protocol in fading environments.Using the relative geographic location with the highest priority node to restrict the forwarding candidate set can largely avoid the forwarding of redundant data.Compared with the existing opportunistic routing protocols,the redundancy rate is effectively controlled.Aiming at the problem of time-varying links and limited node energy in wireless sensor networks,a multipath routing protocol was proposed in this paper that based on link adaptive sensing.The proposed method using an adaptive link quality sensing algorithm to detect link quality's change in real time.To solve the problem of single routing metric,this paper proposes a method improve the multi-path selection strategy.This method comprehensively consider the number of hops,link quality and remaining energy to construct the transmission cost function.In order to improve the backup transmission multipath mechanism,a dynamic polling mechanism based on remaining energy and congestion is proposed to select the best transmission path from the source node to the destination node.Simulation results show that the improved multipath routing protocol has better performance than AODV and AOMDV in terms of data delivery rate,throughput,transmission delay and network life cycle.