The Research And Implementation Of Scheduling Strategy For Conflicting Service Of Smart Home Network Based On ZigBee

In modern life,as the more and more users enjoy the convenient service brought by smart house system,the increasing number of network nodes leads to disordered competition when striving for resource,which has gradually attracted people's attention.How to improve the efficiency of information transmission in network while alleviating the congestion of channel,has become more and more important.At present,the traditional service scheduling algorithm difficultly coordinate the competition problem of obtaining channel resources in ZigBee network.Therefore,how to provide a flexible and reliable scheduling algorithm in ZigBee network is key to current research.In this thesis,we focus on studying the controling of data transmission in ZigBee protocol stack IEEE802.15.4,the detailed work content is showed as follows:1.For the double problem of wasting resource brought in the process of that service compete for channel and the disability to solve emergency for traditional scheduling algorithm in the process of scheduling service,based on the analysis of the characteristics of smart house network,this thesis proposes a dynamic priority real-time transmission scheduling algorithm based on ZigBee network.Firstly,by bringing in transmission priority of business and using the indispensable conditions of striving for service,it has reduced the waste of channel and energy brought by the excessive competition between the nodes in the wireless sensor networks,which not only can reduce the probability of collision conflict when transmitting datas,but can timely respond to the emergency.And then,according to the progress of the current occupation of the channel service,combining with some factors,such as integrated system revenue and node consumption and so on,the node can choose the different transmission control strategy.The simulation results show,comparing with the traditional and other related scheduling algorithm,this algorithm not only can ease the competition degree to some extent,also can reduce the average delayed probability of the executed business and improve the value of service income and completion rate.2.Implementing and validating business scheduling algorithm.At present,when scheduling the transmission business,as it is hard for ZigBee to switch from the short distance communication power to remote communication power,this thesis has designed a flexible power switching strategy,which can make the node be in the state of back-offor sleeping under the scenarios of its preemption transmission.Next,we have added end-to-end network address in the protocol stack,for decreasing the redundant data transmission and improving the channel environment.At last,we have added a scheduling decision rules in the application layer which controlling the underlying layer,by completing for sending business firstly,reaching to the ambition of handling emergency.The experiment result shows that,the smart house scheduling system not only can respond to emergency service,also can effectively maintain some service of higher degree of completion.