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Location-free Data Retrieval In Mobile Multi-Sink Wireless Sensor Networks

Posted on:2011-04-11Degree:MasterType:Thesis
Country:ChinaCandidate:H T LiFull Text:PDF
GTID:2178330338481775Subject:Computer application technology
Abstract/Summary:PDF Full Text Request
With the development of wireless network, more and more applications need sensor network so as to support several mobile Sink to gain data anytime and anywhere. However, the present study just focuses on data retrieval of single and static Sink and little attention is paid on Sink which could move randomly. If there is any, most of them depend on the precise location information of nodes.Based on the simple geometric property that the probability for two pairs of orthometric straight lines to intersect in a two-dimension square area is over 98%, the present study proposes a method of query and pivot which could provide relatively higher success rates of query but using less energy—Double Crosses. At the beginning of the network, it establishes local coordinate system for every node by using the distance information of neighbors. Then, the event point and the query point set buffered data path and query path respectively on the basis of this local coordinate system, constructing two orthometric paths with the event point and the query point as their beginning respectively. Meanwhile, in order to offer satisfactory data for Sink whose location is uncertain, this thesis suggests to complete the fast delivery of data by forwarding data packet to the neighbor nodes of"the last"Sink, reducing the unnecessary delivery and shortening the time.It offers performance valuation to Double Crosses according to theories and abundant of simulation experiments. The results shows: with the increase of network density, transmission radius, or the acceptable declinational angle in the process of delivery, the query success rate increases significantly and reaches to 100% soon. The energy consumption and the length of path would also increase and level off gradually. At the same time, the present study also compares Double Crosses with the current studies on performance valuation of theories and simulation experiments. It shows that a good balance could be reached between query success rate and query energy consumption by using Double Crosses. Meanwhile, the overall performance is better than the current studies with the increase of the scale of networks.
Keywords/Search Tags:Wireless sensor networks, Location-free, Data retrieval, Sink randomly moving
PDF Full Text Request
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