| 摘要 |
PROBLEM TO BE SOLVED: To provide a means for finding a location using diffusion of location information which can be used more generally. SOLUTION: A location finding method uses location data items that are transmitted from known locations, are sent to, and diffused between entities by short-range communication. Each location data item received by an entity indicates a maximum distance of the entity from one of the known locations. Prior to using the location data item for location determination or transferring it to another entity, each 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. The mobile entity effects location determination by finding locations simultaneously consistent with the known maximum distances and any applicable route constraints for how the location data items are sent to the mobile entity.
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