In theInternetofThings,smartthingscommunicatewitheachother,andsenseddataareaggregatedand queriedtosatisfycertainrequestsofend-users.Whenaregionofinterestrequirestobemonitored continuously,thestrategythateachqueryistobeexecutedindependentlythroughgatheringsensed data oftargetsub-regionsmaynotbeenergyefficient, sincethevaluesreportedbysensorsmayhaveno significant differenceinproximatesensingtime-slotsinsomeapplications.Tomitigatetheenergy consumption inthiscontext,inthispaperwe firstly dividetheregionwithsensornodesevenlyintogrid cells, andproposeanenergy-efficiency hierarchicalclusteringindextreetoorganizethesegridcells. Then, wedevelopatime-correlatedregionquerytechniqueforansweringcontinuousqueries.Generally, sensor nodesreporttheirvaluestothebasestationatthebegi

Filename	Size	Update
20140930100908150136.pdf	1735757	2018-02-01

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