Date Added: Dec 2012
A Wireless Sensor Network (WSN) consists of spatially distributed autonomous sensors that cooperatively monitor physical or environmental conditions, such as temperature, sound, vibration, pressure, motion, or pollutants, at different locations. Recent advances in low-power highly-integrated electronics, advances in Micro-Electro-Mechanical Systems (MEMS), rapid growth in the type and quality of available sensors, and progress in communication have allowed WSNs to achieve an unprecedented growth in commercial, industrial and military applications. In order to better understand WSNs, the authors look at their network architectures. In this survey, They classify existing WSN architectures into specific groups based on WSN behavior and data flow characteristics.