Aggregate query processing in the presence of duplicates in wireless sensor networks

摘要

Wireless sensor networks (WSNs) have received increasing attention in the past decade. In existing studies for query processing of WSNs, each sensor node measures environmental parameters such as temperature, light and humidity around its location. Instead, in our work, we consider a different type of sensors that detect objects in their sensing regions which may overlap with each other. In WSNs with such sensors, an object may be detected by several sensor nodes and processing of aggregate queries (such as COUNT, SUM and AVERAGE) becomes problematic since an identical object can be considered redundantly.