| 摘要 |
A method and system for anonymously and opportunistically tracking the location of a portable device in a wireless infrastructure is described. The system comprises an installed infrastructure ( 12 ) in for example a shopping mall, the infrastructure having short range radio stations ( 14 a, 14 b) primarily installed as wireless information access points. Standard communication between a users device ( 10 a) and a station ( 14 a) is according to a short range radio protocol such as ZigBee in which devices are assigned unique identifiers. In an exchange, the identifier is correlated with location, time and date data and uploaded via a backchannel connection ( 16 ) to a database ( 20 ) which a user may connect with at a later time. The user, knowing his objects identifier, can therefore access the data to determine where his object last interacted with a station.
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