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Study On Reliability Of Sink Node In WSN

Posted on:2011-07-11Degree:MasterType:Thesis
Country:ChinaCandidate:T ChenFull Text:PDF
GTID:2178360302493744Subject:Detection Technology and Automation
Abstract/Summary:PDF Full Text Request
Wireless sensor network (WSN) is the research hotspot of current sensor technology, which has a great application prospects in the military and civilian fields. Reliability is an important index of network performance, in the applications requiring high reliability, ensuing network reliability is particularly important.. At present, the outcomes about WSN reliability are abundant. However, most of them improve the network reliability from network topology, reliable protocol, and fault correction on application layer, etc. But they had less consideration about the network equipments. Node is the basic unit for the network, its reliability is the premise of ensuring network reliable .As routing equipment of the network, the reliability of sink node is directly related to whether datas could be reliably transmitted to the user, so it is necessary to research the reliability model of the sink node, thus to improve the reliability of node data transmission.Since most practical applications use hierarchical WSN. a method for improving the sink node reliability is put forward based on analyzing the structure features of hierarchical WSN and summarizing the fault sources of nodes. It improves the reliability of sink node by drawing lessons from the spare parts measure used to improve mechanical reliability and combining the retransmission mechanism used for soft fault. Reliability functional model is established based on qualitative analysis. By using markov status graph and probability analysis, impacts of spare parts number and retransmission times on the reliability are quantitatively analyzed, and quantitative relationships among retransmission times, communication time and energy consumption are built. Take WSN applied in the power system for example, reliability model of sink node is solved, thus the optimum numbers of spare parts and retransmission are obtained. According to the best model parameters, adopting MSP430F135 and CC2420, CC2430 as core components, hardware design of sink node is implemented. Combining with existing sensor nodes, the experiment platform for sink node reliability testing is established, and software design of sink node and sensor node is completed. Under the premise of the normal operation of Software-Hardware, contrast experiments on the reliability of the node in this paper and general sink node are done. The effects of obstacle, transmission distance and transmit power on node reliability is specific studied, and test results are obtained by analyzing variation and mean of LQI. Experimental results show that compared with normal sink node, the sink node in this paper could avoid the transient faults in communication link, thus it has stronger anti-interference ability, and larger packet reception rate while transmission distance is longer or transmit power is less.
Keywords/Search Tags:Wireless Sensor Networks, Reliability, Sink Node, Markov Status Graph, IEEE802.15.4, MSP430F135, CC2420, CC2430
PDF Full Text Request
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