ENMSJ : An Efficiency Filtering Technique using Bitmap Vectors for n-way Joins in Wireless Sensor Networks
DOI:
https://doi.org/10.24203/ijcit.v11i2.180Keywords:
communication cost, in-network join, n-way join, wireless sensor networksAbstract
In wireless sensor networks, join queries execution introduces a high energy consumption. While energy is an important factor for sensors survival, several techniques were developed to reduce it. Sensors energy is affected by the number of transferred messages whereas query is performed. The aim of the proposed techniques was then to decrease the communicated data volume. So, the exchanged data volume is soaring when joins are performed between many data tables. This joins type is called: n-way join query. In this paper, we present an efficiency technique to treat n-way join queries in wireless sensor networks. This technique is named: Enhanced N-way Mediated Semi-Join (ENMSJ). ENMSJ is an improvement of a precedent strategie that we proposed: N-way Mediated Semi-Join (NMSJ). ENMSJ uses bitmap tables to more reduce transferred messages quantity. We compared the two techniques to test their performance. Obtained results are very hopeful.
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