Description: 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
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