Research On Polling Scheme Based On Busy/idle Nodes Mechanism For Wireless Sensor Networks

So far,the application of wireless sensor network has been integrated into all areas of our lives.As a kind of a new technology to obtain the information,the wireless sensor network(WSN)has received widespread attention and has become a hot topic in network research.Since the resources in wireless sensor networks are limited,much attention has been paid to develop energy efficient solutions.Therefore,the design of MAC protocol is very important for wireless sensor networks.The mechanism of MAC includes polling mechanism and random multiple access,both of which are widely used in the design of MAC protocol in wireless sensor networks.This paper researches and analyzes the advantages and disadvantages of the MAC protocol in wireless sensor networks and proposes a busy ring/idle ring-distinguished polling system for wireless sensor networks,which makes a distinction between busy and idle stations on the basis of the traditional polling control mechanism.In the research of polling control mechanism,it is a difficult problem to analyze the first order and two order characteristics of the system model.Especially for the accurate analysis of the second order characteristic,which is a very complicated process and is difficult to deal with.In this paper,we established a busy ring/idle ring-distinguished with parallel scheduling polling system model by the method of the embedded Markov chain and the probability generating function,meanwhile,the parallel processing is used in the process of query transformation.Not only can the first order characteristics of the system that the expression of the average queue length and cycle time be analyzed,we can also get the two order of the system characteristic that the expression of the average delay,all of which are verified by simulation experiments.In this paper,we design the MAC protocol for wireless sensor network,add the B/I address to the frame control field to distinguish the busy idle state,and service the information packets of the system by the busy ring/idle ring-distinguished with parallel scheduling polling control mechanism.The experimental results verify the correctness of the theoretical analysis and it shows that the new MAC protocol can improve the system performance and save energy effectively.Finally,based on the research of the n-limited service,the paper distinguishes the priority of the nodes and analyzes the priority control mechanism based on the n-limited service.The experiments show that the priority control mechanism based on the n-limited service can distinguish the priority of the nodes with different requirements.