Research On Cooperative Algorithms Based On Directional Antenna For Wireless Sensor And Actor Networks

Wireless Sensor and Actuator Network(WSAN)is based on Wireless Sensor Network(WSN)and joins the Actuator Node,which can change the environment to perform tasks.The most important feature of WSAN network is collaboration,including the collaboration between sensor nodes(S-S),the collaboration between sensor nodes and actuator nodes(S-A),and the collaboration between actuator nodes(A-A).Nodes work together to monitor and control the environment.In WSAN network,the nodes with traditional omnidirectional antenna have many problems,such as large positioning error,high information transmission delay and low optimal node discovery rate.Based on directional antenna,this paper optimizes the problems of node location,information transmission and task allocation.The specific research contents are as follows:(1)Aiming at the problem of poor positioning accuracy of omnidirectional antenna anchor node in WSAN network,this paper proposes a positioning method of directional antenna anchor node.Actor nodes with directional antennas will move within the network as anchor nodes to locate sensor nodes.According to the calculation of the intersection point of the side line,the maximum signal gain intersection point and the center of mass of the intersection signal area of the antenna beam of the actor anchor node,the sensor can get its own position.In addition,the possible positioning errors of nodes are analyzed,and the optimization method is proposed.In WSAN network node localization link,directional antenna anchor node localization algorithm improves the accuracy,but also reduces energy consumption.(2)Aiming at the problem of high latency in omnidirectional antenna node communication in WSAN network,this paper proposes a directional propagation routing ADA.ADA calculates based on the location information of communication nodes,uses directional antenna for directional forwarding,and enables the communication between sensor and actor to use a unified routing protocol.After multiple directional forwarding,event information is transmitted from the source node to the target node.Compared with WSAN networks using omnidirectional antenna nodes,it reduces invalid information forwarding and information delay.(3)Aiming at the problem of low discovery rate of optimal execution nodes in traditional bidding algorithm,a directional bidding algorithm DSAAP is used to optimize the task allocation process of WSAN network.DSAAP optimizes the expansion and contraction stages of response tree based on the traditional bidding protocol SAAP.The algorithm calculates the cost of event service based on the location information of event points,and uses directional forwarding to forward bidding information.Through simulation analysis,compared with traditional bidding algorithm,directional bidding algorithm improves the optimal node discovery rate and reduces energy consumption.