These results can be attributed to the reduced number of data transmissions over the network owing to the application of spatio-temporal query aggregation, which eliminates the necessity to collect data from the sensor nodes for every single query.
16, the accuracy for query processing results is 95% or higher up to 70% of itinerary level, while performance degrades slightly in the range from 70% to 100%.
The query path is outlined because the variety of hop count that is calculated supported the network size and therefore the radio vary between nodes.
Where Replay_WT is that the replay waiting time for a query provision node and Net_Size is that the size of the network and D_SR the amount of hops between the source node and current replay node, the waiting time is that the time that a query takes to be processed at each node.
Figures 5 and 6 show the distributed index processing precise check
query, range
query (search radius of 0.01, 0.05 and 0.1)
query efficiency.
The rest of the paper is structured as follows: In section 2, we summarize related work on
query expansion and document retrieval.
Privacy preserving range
query has been widely studied in two-tiered wireless sensor networks.
o the
query transformed in many ways: marking off phrases, disambiguating
query terms,
query expansion, specifying that some terms occur in certain data field(s), and more;