Screening transmissions for power level and object identifier in asset monitoring and tracking systems
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United States of America Patent
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Jun 22, 2010
Grant Date -
May 14, 2009
app pub date -
Jan 14, 2009
filing date -
Dec 22, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
A method for communicating to a recipient transceiver from a plurality of transceivers located within the broadcast range of the recipient transceiver includes: transmitting a communication at a first power level such that only a first group of transceivers receive the broadcast, the communication including a command causing each of the first group of transceivers not to respond to a subsequent broadcast; and subsequent thereto, transmitting a communication at a second power level greater than the first power level such that a second group of transceivers greater than and including the first group of transceivers receive the broadcast, but such that only a limited number of transceivers of the second group respond to the broadcast, the limited number of transceivers excluding the first group of transceivers. Each of the plurality of transceivers is associated with a respective sensor for acquiring data and transmitting the data to the recipient transceiver.
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