A study on name card exchange between hand-held devices using bluetooth

Abstract

Name card exchange between hand-held devices is a promising application for a wireless proximity networking technology such as Bluetooth. Bluetooth can transmit multi-media name cards that include images, audio, and even motion pictures at a relatively high speed. However, for such application to be successful in the market, the human interface or the application menu must be simple and easy to understand, and the transaction delay must be short. In this thesis, we first analyze the transaction completion delay under the current Bluetooth specification, considering the necessary protocol stacks, the message transmission time, and the message processing delay. We show the relation between the total time delay and the processing time. The master-slave relation in the inquiry procedure of the Bluetooth specification may cause an acceptable delay and a nuisance in the human interface in designing peer-to-peer applications such as the name card exchange. Secondly, we propose a master-slave random selection scheme. In this scheme, Bluetooth units changes their states between the master (inquiry) and the slave (inquiry scan) according to a random process without requiring any user intervention. Under this scheme, users can exchange name cards more naturally because users don``t have to know about the ``master and slave`` jargon, and the resulting transaction delay can be made small. The performance of the proposed scheme is evaluated and optimal parameter values are found through computer simulations.