Method and apparatus for battery power conservation in tags
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
N/A
Issued Date -
Jan 18, 2007
app pub date -
Nov 3, 2005
filing date -
Jun 23, 2005
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A tag has first and second modes of operation, and uses substantially less battery power in the first mode. In the first mode, the tag is responsive to receipt of a first wireless signal from a remote location with a first transmission range for shifting to the second mode. In the second mode, the tag transmits a second wireless signal with a second transmission range. In one configuration, the second transmission range is greater than or equal to the first transmission range. In a different configuration, the tag periodically checks for the first wireless signal during the first mode at points in time spaced by a time interval. The second transmission range is less than the first transmission range by a difference that is greater than or equal to the time interval multiplied by a speed of movement of the tag toward the remote location.
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