11-06-2012, 05:13 PM
Introduction of Bluetooth technology
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ABSTRACT
The seemingly endless entanglement of data wires connecting today’s electronic devices has become slightly less jumbled with the introduction of Bluetooth technology and the creation of a wireless data link. This article delves into the implementation and architecture of Bluetooth. It also describes the functional overview and applications of Bluetooth. It gives significant advantages of Bluetooth over other data transfer technologies such as IrDA and Home RF. It illustrates how a connection is made in Bluetooth between two environments.
Establishing a connection in Bluetooth:
Linking one Bluetoooth device to another to another involves a series of inquiry and paging procedures. The inquiry process entails the following steps:
• The Bluetooth device sends out an inquiry access code packet (inquiry packet) to search and locate these devices.
• The existing Bluetooth devices already within the area (and usually unware of any inquiring devices) will occasionally enter an inquiry scan state of their own to troll for any inquiring devices.
• when a device in the inquiry scan state receives an inquiry packet, it will respond with a frequency hop synchronization (FHS) packet that is sent back to the inquiring device.
Bluetooth packet format:
Since Bluetooth is meant to be compatible with many different applications, it must be able to send data with different protocols quickly and efficiently. When data is transmitted at the lowest level, it is first broken down into smaller packets and sent serially with the least significant bit sent first. Each data packet (represented in Figure 2) contains three fields: an access code, a header, and a payload.
GENERAL BLUETOOTH ARCHITECHTURE
Facilitating this data transmission is a series of protocols within the Bluetooth system that processes the data for suitable transmission and receipt.
The general structure of a Bluetooth system consists of a microprocessor that handles all the base band specifications, and several software layers that structure the data so that it may be sent properly over a Bluetooth link. Figure 5 provides a good representation of the architecture.
At the highest architecture level lies the different communication and data information protocols that can communicate over the Bluetooth link, including wireless application protocol (WAP), user datagram protocol (UDP), transport control protocol (TCP), internet protocol (IP), and point-to-point protocol (PPP). While all of these are standalone communication protocols, they can be adapted for transmission over a Bluetooth link. To support these different types of communication protocols.