Location data diffusion and location discovery
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United States of America Patent
Stats
-
Apr 11, 2006
Grant Date -
Apr 18, 2002
app pub date -
Jul 13, 2001
filing date -
Jul 18, 2000
priority date (Note) -
In Force
status (Latency Note)
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Abstract
A location discovery method using location data items that originate at known locations (X,Y) and are passed to, and diffused between, entities (A,B) by short-range communication. Each location data item received by an entity (A,B) indicates a maximum distance of the entity from one of the known locations (X,Y). Each entity (A,B) prior to using a location data item for location determination or transferring it to another entity, is operative to increase the maximum distance indicated by the location data item to take account of movement of the mobile entity since receiving that item. A mobile entity (A) effects location determination by finding locations (40) simultaneously consistent with the maximum distances (31,36) it knows of and any applicable route constraints for how the location data items passed to the mobile entity.
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