Instead of scanning for every devices appear near the field. I only look for some pre-known devices. (See the scenario 1). Actually in the scenario 1, it does not require you do any programing, just acknowledge your buddies to name their Bluetooth phone and exchange name to each other. When never both of them are close enough (according to Bluetooth specifications, the Bluetooth field is 10meters), they can “see each other”. The program on devices are just do that job automatically. So the users are just simply turned on their phones. The scanner device need to install the PlaceAware application, the person who need pickup at air port
Scenario 1: Airport pickup. (Actually, this scenario happend after the paper is accepted). But in the prototype, I set up a scenario in my office with my buddies. The main idea is discover a pre-known Bluetooth name appear in the field.
Scenario 2: This scenario is more complicated. I setup a lab and make use of many technologies: OWL-DL (protege), SPARQL, jade agents. The main idea is using SPARQL query to query the Knowledge Base that store anything happened in the community (in this scenario is the room).
In short, the Bluetooth mobile phones are pervasive, we just think of another way of using it as a tag for person discovery 
Even though Bluetooth is slow, and short-range, but its dis-advantages become advantages where people walking speed is much slower in crowded area, where the visibility is limited and within 10m we can easy recognize each other.
Even though Bluetooth is slow, and short-range, but its dis-advantages become advantages where people walking speed is much slower in crowded area, where the visibility is limited and within 10m we can easy recognize each other.Is it useful that building a knowledge base (KB) for a certain place that can capture context as much as possible. Later on, the KB can be used for something else.
Selected references:
[1] T. Kindberg and T. Jones. “merolyn the phone”: A study of bluetooth naming practices (nominated for the best paper award). In J. Krumm, G. D. Abowd, A. Seneviratne, and T. Strang, editors, Ubicomp, volume 4717 of Lecture Notes in Computer Science, pages 318-335. Springer, 2007.
[2] E. Paulos and E. Goodman. The familiar stranger:anxiety, comfort, and play in public places. In CHI ‘04: Proceedings of the SIGCHI conference on Human fac- tors in computing systems, pages 223-230, New York, NY, USA, 2004. ACM.
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