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Study on Time Synchronization and Network Optimization in Wireless Sensor Networks

Author: ZhangXiaoJing
Tutor: GuanXinPing
School: Yanshan University
Course: Control Theory and Control Engineering
Keywords: Wireless sensor networks Clock synchronization Low power consumption Network optimization Congestion Control Medium Access Control Cross-layer design
CLC: TP212.9
Type: Master's thesis
Year: 2009
Downloads: 248
Quote: 2
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Abstract


Integration of the sensor , embedded computing , network and wireless communication four wireless sensor network (WSN) technology is a new information acquisition and processing technology , time synchronization technology is the the WSN a key supporting technologies , many WSN applications such as TDMA scheduling , collaborative hibernation , positioning , data fusion , etc. need to clock synchronize the nodes in the network . Since the sensor nodes are energy-constrained , reducing energy consumption is one of the most important objectives to be considered by the design WSN protocol . Transmission quality and network lifetime is an important measure of energy constrained multi-hop wireless sensor network performance indicators suitable MAC protocol can reduce the energy consumption and extend the network lifetime . First, in-depth study of a sensor network time synchronization of the basic concepts and existing classical time synchronization mechanisms , and analyze and summarize the advantages and disadvantages of the classic synchronization mechanism . The classic time synchronization mechanism can be divided into three categories : receiver - the receiver synchronization mechanism , such as the RBS ; based on the sender - receiver synchronization mechanism such as TPSN, LTS; synchronization mechanism based on the sender , such as DMTS FTSP . Secondly, on the basis of the existing synchronization mechanisms proposed a new clustering - based low-power multi-hop sensor network synchronization mechanisms . The mechanism combined with the one-way broadcast synchronization mechanism and two-way paired synchronization mechanism , under the premise of not cause synchronization lag significantly reduce the overhead of synchronization messages . Hierarchical network structure on the basis of a sub - cluster algorithm will LCTS to be extended to multi-hop network , and clock drift compensation, to ensure a certain degree of accuracy . Error and energy analysis of this mechanism , on in Simsync platforms to the simulation experiment , and were compared with the existing typical algorithms . Finally, based on the idea of cross-layer design , the joint consideration of congestion control, the collision control and energy control , for the solution of the rate of the source end of the transport layer , the optimal value of the access probability of the MAC layer link and network layer nodes life to maximize compromise of network utility and network lifetime . Variable substitution , non - convex and can not be separated from the original problem into a convex optimization problem based on dual decomposition . The dual decomposition through vertical and horizontal , fully distributed strategy proposed based on the sub- gradient algorithm . The convergence and effectiveness of the algorithm is verified by simulation .

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CLC: > Industrial Technology > Automation technology,computer technology > Automation technology and equipment > Automation components,parts > Transmitter ( converter),the sensor > Sensor applications
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