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Speed improvement of inquiry state process in bluetooth technology

IP.com Disclosure Number: IPCOM000016046D
Original Publication Date: 2002-Aug-05
Included in the Prior Art Database: 2003-Jun-21

Publishing Venue



Disclosed is a method for speed improvement of inquiry state process in Bluetooth technology. It takes dozens of seconds to start Bluetooth connection, therefore it is difficult to apply Bluetooth to system which require quick response (For example, ticketless gating system). With the following method, the time concerning to start Bluetooth connection is shorted without hardware and firmware changing from present Bluetooth devices. This is able to apply Bluetooth to system which is required quick response. Almost the time which spend on starting Bluetooth connection is the inquiry state process which is searching other Bluetooth devices. The inquiry state process is recommended to be performed about 10 seconds on present Bluetooth specification Bluetooth 1.1. On the inquiry state process, specified 32 channels are used. Device which perform the inquiry (master) is using 16 frequency channels to send IQ packets on 2.56 seconds. Master switch channels to the other 16 channels to send IQ packets on the next 2.56 seconds. On the other hand, devices which respond the inquiry (slave) are waiting for IQ packets only a frequency channel which is switched channel each 1.28 seconds. Therefore to find other Bluetooth devices more quickly, two or more IQ packets are sended simultaneously on each other frequency channels. The way to perform this method is performing the inquiry simultaneously by two or more Bluetooth devices. The expected value of frequency channels which are used on inquiry state process is following. ('n' is number of master devices.) 