Research On Key Techniques Of Data Reliable Transmission In Wireless Sensor Networks

Wireless sensor network is composed of a large number of low-cost,small-size,low-power tiny sensor nodes with the capacity of wireless communication and computation in the form of self-organization.These senor nodes can be used for sensing?monitoring and collecting the environment information of overlay area,and processed sensing data to base station by a multi-hop form.WSN has many features including flexible deployment,good scalability,low-cost.WSN are widely used in many fields,such as environmental monitoring,medical care,intelligent transportation,military security,etc.The sensor nodes with resource constraint are often applied in the harsh environment,and affected by attenuation,path loss,multi-path,dead zone,deterioration of node performance which easily lead to bit errors and data frame loss in data transmission process.Due to the distinguishing feature of WSNs is data-centered,so how to reliably transmit data is an important problem in the research of wireless sensor network.Analysis and summary base on research status of data reliable transmission,related research method for WSNs at home and abroad.Aiming at the lack of data reliable transmission in wireless sensor network,the corresponding research ideas and solutions are proposed.The main contribution of this dissertation as follows:Research on data reliable transmission based on malicious nodes.Deployed in some inaccessible hostile environment,individual nodes of the wireless sensor networks(WSNs)could be easily captured by the adversaries to become malicious nodes due to the absent corresponding protective measures,and the information received are easily eavesdropped,falsified and intercepted,which has seriously threatened data reliable transmission based on WSNs.Therefore,a applicative MERS algorithm is proposed to meet the existence of malicious nodes by combining multi-path routing with secret sharing algorithm,which can not only avoid being wiretapped by malicious nodes,but effectively reduce the probability of data being intercepted.In addition,focusing on the detection for malicious nodes,an intrusion detection algorithm is also presented,which can further assure data reliable transmission.Study on data reliable transmission based on low-energy code dissemination.The excessive energy expenses of code dissemination has been long troubling the large-scale applications of remote code update in the WSNs.However,premature death of nodes in the resource-constrained WSNs due to excessive energy consumption will easily cause communications link interrupt and data packet dropout,affecting data reliable transmission.A low energy consumption code dissemination protocol has been proposed by tracking the mainstream code dissemination technology currently which can determine whether the code dissemination is needed in Wireless Sensor Networks when the sensor node is under normal communication.Simulation result shows that the protocol can effectively reduce the energy consumption,prolonging the life cycle of sensor node network,the reliability of data transmission get improved.Study on date reliable transmission based on cooperative ARQ protocol.The virtual MIMO system,which are formed by using the wireless radio features and the introduced cooperative communication technology,can effectively increased space diversity gain of WSNs and significantly improved the data transport reliability.As an error-control technology for network transmission,automatic repeat request(ARQ)can ensure highly reliable data transmission.Collaborative automatic retransmission request(CARQ)which combines cooperative communication with ARQ technology can not only increase the diversity gain,but improve the reliability of data transmission.In this dissertation,through introducing the CARQ mechanism in the WSNs,the throughput efficiency and energy efficiency of the three-node typical collaborative ARQ were analyzed theoretically and verified via simulation experiments.Study on data reliable transmission based on two-relay cooperative ARQ protocol.Through introducing the data transmission of two-relay nodes cooperative source nodes in the WSNs cooperative ARQ system,two-relay TRCAP protocol is proposed.The analysis results of the system throughput efficiency and energy efficiency for building a Markov chain model show that two-relay TRCAP protocol can get better throughput efficiency and energy efficiency when the reliability of wireless data transmission is insured.Finally,simulation experiments are finished to validate these results.