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2013 IEEE 19th International Conference on Embedded and Real-Time Computing Systems and Applications (2007)
Daegu, Korea
Aug. 21, 2007 to Aug. 24, 2007
ISSN: 1533-2306
ISBN: 0-7695-2975-5
pp: 355-362
Guo-Liang , National Taiwan University, Taipei, Taiwan
Chi-Sheng Shih , National Taiwan University, Taipei, Taiwan
ABSTRACT
We develop a data alignment mechanism for sensor networks. The mechanism allows the sensor data streams to be aligned without real-time clocks or virtual clocks [1]. The developed mechanism makes use of the built-in counters on sensors and external synchronization signals to align data streams. The data server broadcasts out-of-channel synchronization signals with constant or variable intervals. The sensor data streams are aligned when received on the server. Only one way communication is used so as to reduce the communication overhead and clock synchronization overhead on sensors nodes. In addition, the developed mechanism is scalable thanks to one way communication. The synchronization error is bounded by the maximum sampling period of the sensors, and is independent of the number of the nodes in the network. Our analysis also shows the required awake time for sensors to tolerate different clock drifts and signal lost.
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CITATION
Guo-Liang , Chi-Sheng Shih, "Clock Free Data Streams Alignment for Sensor Networks", 2013 IEEE 19th International Conference on Embedded and Real-Time Computing Systems and Applications, vol. 00, no. , pp. 355-362, 2007, doi:10.1109/RTCSA.2007.27
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