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Research On Node-Scheduling Scheme In Wireless Sensor Networks

Posted on:2008-01-17Degree:MasterType:Thesis
Country:ChinaCandidate:D ChenFull Text:PDF
GTID:2178360215955963Subject:Computer application technology
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Wireless sensor network consists of a large number of low-power, short-lived, unreliable sensors. Sensor not only can sense environment, but also can process data, and can communicate with each other by wireless communication components contemporary, it is the equipment which has the ability of sensing and communication. But wireless sensor network is a kind of energy constrained network. So conserving energy and prolonging network lifetime is one of the main design goal.A wireless sensor networks has a large number of sensors deployed in high density, and all nodes share common sensing tasks. That implies that not all sensors are required to perform the sensing tasks during the whole system lifetime. Making some nodes sleep does not affect the overall system function, as long as there are enough working nodes to assure it. Therefore, if we can schedule sensors to work alternatively, system lifetime can be prolonged correspondingly. Nowadays, there are many researches on node-scheduling. Such as Location and calculation-free node-scheduling schemes in large wireless sensor networks, scheduling sleeping nodes in high density cluster-based sensor networks and balanced-energy sleep scheduling scheme for high density cluster-based sensor networks.A neighbor-information-based (NIBS) node-Scheduling scheme in wireless sensor networks and a balanced-energy (BS) scheduling schemes in wireless sensor networks are proposed in this thesis.The NIBS scheme is location and calculation-free, although it cannot completely preserve the original system coverage. If the maximal percentage loss of sensing area at each node is selected, the status of each node can be decided by this threshold value. Simulation results show that it can extend the network lifetime effectively.The BS scheme aims to evenly balance the energy load among a large number of nodes, ensure they are dead at the same time and avoid generate holes (uncovered areas within the overall sensor networks coverage area). Analytical and simulation results show that the BS scheme extends the network lifetime while maintaining balanced energy.
Keywords/Search Tags:wireless sensor networks, node scheduling, balanced-energy, lifetime, coverage
PDF Full Text Request
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