Method of addressing messages and communications system
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United States of America Patent
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Jul 20, 2010
Grant Date -
Sep 22, 2005
app pub date -
Jun 1, 2005
filing date -
Feb 19, 1998
priority date (Note) -
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status (Latency Note)
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Abstract
In one among many embodiments, the invention provides a system including an interrogator communicating to a selected one or more of a number of communications devices. A plurality of communications devices select random values independently of random values selected by other devices. The interrogator transmits a first signal requesting devices within a specified group of devices to respond, the specified group being less than or equal to all of the devices within a field of the interrogator. Devices receiving the first signal respectively determine if the respective device falls within the specified group and, if so, send a reply including a respective random value to the interrogator within a randomly selected time slot of a number of slots; and, if not, do not send a reply. The interrogator determines if a collision occurred between devices that sent a reply. The interrogator also creates a new, different specified group.
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