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The device discovery in bluetooth networks is implemented by master running the Inquiry protocol and slaves running the Inquiry Scan protocol. Page and Page Scan protocols are used by the master and slave respectively for establishing a connection between the master and the slave. Upper level data can be exchanged between the two devices after the connection has been established. there is a random delay in the process of discovering a device. The reasons of occasional long discovery time is analyzed and means to improve it are proposed. The discovery time for different situations is also analyzed. Low power, low cost, short-range wireless radio link is provided by the bluetooth protocol. Device discovery simplifies the task of finding and connecting to different services available locally. A a mobile ad-hoc network is produced which is tailored for the environment. The baseband protocol takes care of the basic tasks of device discovery and subsequent connection.

Inquiry and Inquiry scan protocol
It consists of two parts:
-Inquiry
-Inquiry Scan
A discovering device (or,master) runs the Inquiry protocol and a device willing to be
discovered (or, slave) runs the Inquiry Scan protocol. a user or application on the device initiates the device discovery procedure. the potential master transmits an ID packet which contains the inquiry access code (IAC), common to all Bluetooth devices. The devices in the standby always do a periodic scan to enter the inquiry scan state to search for IAC code.

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http://www.filesonicfile/23838373/Discovery and Delay Analysis of Bluetooth Devices.pdf