For Full-Text PDF, please login, if you are a member of IEICE,|
or go to Pay Per View on menu list, if you are a nonmember of IEICE.
Cross-Layer Design for Low-Power Wireless Sensor Node Using Wave Clock
Takashi TAKEUCHI Yu OTAKE Masumi ICHIEN Akihiro GION Hiroshi KAWAGUCHI Chikara OHTA Masahiko YOSHIMOTO
IEICE TRANSACTIONS on Communications
Publication Date: 2008/11/01
Online ISSN: 1745-1345
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Emerging Technologies for Practical Ubiquitous and Sensor Networks)
cross-layer design, crystal oscillator, long-wave standard time code, low power listening, MAC,
Full Text: PDF(823.8KB)>>
We propose Isochronous-MAC (I-MAC) using the Long-Wave Standard Time Code (so called "wave clock"), and introduce cross-layer design for a low-power wireless sensor node with I-MAC. I-MAC has a periodic wakeup time synchronized with the actual time, and thus we take the wave clock. However, a frequency of a crystal oscillator varies along with temperature, which incurs a time difference among nodes. We present a time correction algorithm to address this problem, and shorten the time difference. Thereby, the preamble length in I-MAC can be minimized, which saves communication power. For further power reduction, a low-power crystal oscillator is also proposed, as a physical-layer design. We implemented I-MAC on an off-the-shelf sensor node to estimate the power saving, and verified that the proposed cross-layer design reduces 81% of the total power, compared to Low Power Listening.