We propose a novel context detection mechanism in Wireless
Sensor Networks, called PROCON. In PROCON, context decisions are
made in a distributed way, by cooperation of nodes connected through
a context overlay on the network. As a result, the sensor network can
deliver context level information, not low level sensing data, directly
to proper actuators. Moreover, PROCON achieves highly efficient energy
consumption compared to the existing centralized context detection
mechanism. The analysis and simulation results show that the proposed
mechanism outperforms the existing centralized mechanism in average
energy consumption, capability of mitigating congestion to a base station,
context service lifetime, and reliability.