(Supported by the National Natural Science Foundation of China under Grant No.60273009 (国家自然科学基金); the National High-Tech Research and Development Plan of China under Grant No.2001AA112080 (国家高技术研究发展计划(863)); the National Grand Fundamental Research 973 Program of China under Grant No.G1999032707 (国家重点基础研究发展规划(973))
Sensor network, which is made by the convergence of sensor, micro-electro-mechanism system and networks technologies, is a novel technology about acquiring and processing information. In this paper, the architecture of wireless sensor network is briefly introduced. Next, some valuable applications are explained and forecasted. Combining with the existing work, the hot spots including power-aware routing and media access control schemes are discussed and presented in detail. Finally, taking account of application requirements, several future research directions are put forward.