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Issue No.06 - June (2009 vol.58)
pp: 827-838
You-Chiun Wang , National Chiao-Tung University, Hsin-Chu
Yao-Yu Hsieh , National Chiao-Tung University, Hsin-Chu
Yu-Chee Tseng , National Chiao-Tung University, Hsin-Chu
ABSTRACT
In many WSN (wireless sensor network) applications, such as [1], [2], [3], the targets are to provide long-term monitoring of environments. In such applications, energy is a primary concern because sensor nodes have to regularly report data to the sink and need to continuously work for a very long time so that users may periodically request a rough overview of the monitored environment. On the other hand, users may occasionally query more in-depth data of certain areas to analyze abnormal events. These requirements motivate us to propose a multiresolution compression and query (MRCQ) framework to support in-network data compression and data storage in WSNs from both space and time domains. Our MRCQ framework can organize sensor nodes hierarchically and establish multiresolution summaries of sensing data inside the network, through spatial and temporal compressions. In the space domain, only lower resolution summaries are sent to the sink; the other higher resolution summaries are stored in the network and can be obtained via queries. In the time domain, historical data stored in sensor nodes exhibit a finer resolution for more recent data, and a coarser resolution for older data. Our methods consider the hardware limitations of sensor nodes. So, the result is expected to save sensors' energy significantly, and thus, can support long-term monitoring WSN applications. A prototyping system is developed to verify its feasibility. Simulation results also show the efficiency of MRCQ compared to existing work.
INDEX TERMS
Coding, data compression, sensor data aggregation, sensor data management, wireless sensor networks.
CITATION
You-Chiun Wang, Yao-Yu Hsieh, Yu-Chee Tseng, "Multiresolution Spatial and Temporal Coding in a Wireless Sensor Network for Long-Term Monitoring Applications", IEEE Transactions on Computers, vol.58, no. 6, pp. 827-838, June 2009, doi:10.1109/TC.2009.20
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