Monitoring Warning Client Research Based On Priority

With the rapid development of technology and continue increase ofhuman demands,the usage of sensor networks in indoor and outdoor monitoring warning,battlefield deployment,investigation of enemy situation,agricultural production management,mine supervision and other fields becomes more and more widely.As a new type of information acquisition and processing technology,wireless sensor network in environmental monitoring application,through arrange sensor nodes in certain areas and then collect relevant data to process.Then send this data to remote monitoring center through many roads to make researchers monitor wireless network's information in time.However,monitoring and warning system remains many problems,such as failed to distribute wireless sensor networks reasonable and failed to transmit high priority data first and so on.In order to modify these problems and further improve monitoring and warning system,this paper discuss ZIGBEE standard in detail,and mainly do the improvements in the following aspects.For the problem that monitoring and warning system failed to distribute sensor network reasonable,according to the warning system's real-time feature,this paper presents a MAC layer mathematical model of ZIGBEE standard based on service time.Further study all aspects of performance in this model,such as service time and drop rate.Through MATLAB and OMNET++ network simulation software to verify the accuracy of this model.What's more,also do the research of wait time feature through simulation,and get the relationship between wait time and data sending rate and queue length.This mathematical model is a strong theoretical basis to distribute sensor network reasonable.For the lack of dealing high priority data in monitoring and warning system,this paper presents a modified method based on priority transmission in wireless sensor network MAC layer.Through this method,we can firstly transmit high priority data(such as warning information and environment information)which can support network to satisfy some special scene's command.Through OMNET++ to verify the feasibility of this algorithm,and provides some reference value to monitoring and warning system based on priority transmission.For the application of monitoring and warning system,this paper design and implement monitoring and warning system in handle terminal.Using the proposed mathematical model based on service time to choose the best topology to achieve a real-time transmission purpose.Meanwhile,has achieved a modified algorithm based on priority of MAC layer in handle terminal warning system under this topology,verified modified algorithm is much better than the original algorithm in alarm data transmission.What's more,using socket communication key technology and timer technology,implement remote real-time requires of sensor network information environment and controls of light switch state information and so on.This modified algorithm provides a strong support on wireless sensor network in indoor monitoring warning.