BLUETOOTH                          The “Tech”nology behind it!

Chinmayee Nagaraju & Gayathri S

luetooth wireless technology is a short-range communications system intended to replace the cables connecting portable and/or fixed electronic devices.

The key features of Bluetooth wireless technology are robustness, low power, and low cost. Many features of the core specification are optional, allowing product differentiation.

The Bluetooth core system consists of an RF transceiver, baseband, and protocol stack. The system offers services that enable the connection of devices and the exchange of a variety of data classes between these devices.

It is developed by a group called BlueTooth Special Interest Group (SIG) in May 1998.

OVERVIEW OF OPERATION

The Bluetooth RF (physical layer) operates in the unlicensed ISM band at 2.4GHz. The system employs a frequency hop transceiver to combat interference and fading, and provides many FHSS carriers. RF operation uses a shaped, binary frequency modulation to minimize transceiver complexity
During typical operation, a physical radio channel is shared by a group of devices that are synchronized to a common clock and frequency hopping pattern. One device provides the synchronization reference and is known as the master. All other devices are known as slaves. A group of devices synchronized in this fashion form a piconet. This is the fundamental form of communication for Bluetooth wireless technology.
Above the physical channel there is a layering of links and channels and associated control protocols. The hierarchy of channels and links from the physical channel upwards is physical channel, physical link, logical transport, logical link and L2CAP channel. It provides the effect of full duplex transmission.

BENEFITS OF BLUETOOTH TECHNOLOGY

Why Choose Bluetooth wireless technology?

Bluetooth wireless technology is the simple choice for convenient, wire-free, short-range communication between devices. It is a globally available standard that wirelessly connects mobile phones, portable computers, cars, stereo headsets, MP3 players, and more. Thanks to the unique concept of “profiles,” Bluetooth enabled products do not need to install driver software. Bluetooth wireless technology is the leading and only proven short-range wireless technology on the market today

Globally Available

The Bluetooth wireless technology specification is available free-of-charge to our member companies around the globe. Manufacturers from many industries are busy implementing the technology in their products to reduce the clutter of wires, make seamless connections, stream stereo audio, transfer data or carry voice communications. While you must subscribe to a cellular provider to use GSM or CDMA, with Bluetooth technology there is no cost associated with the use beyond the cost of your device.

Range of devices, Ease of use , Lower Power Consumption and Secure Connections are the added features which makes BLUETOOTH rule the TECH MARKET

Near Field Communication (NFC) Technology NFC may also be used in the new pairing system, enabling a user to hold two devices together at a very short range to complete the pairing process.

Bluetooth v. 802.11
Bluetooth

– Designed for quick, seamless short range networks
– Features low power consumption, small protocol stack,robust data & voice transfer
– Cheap price
Good choice for WPAN (Wireless Personal Area Networks)

802.11

– Designed for infrequent mobility, IP-based data transmission
– Medium range and high data rate
– At least 10x the price of bluetooth
– Good choice for WLAN (Wireless Local Area Networks)

Bluetooth Security

Must consider standard ad hoc network issues Availability
DOS attacks easy to perform
Routing protocol attacks
Battery Exhaustion attacks – Confidentiality & Integrity
Anyone can sniff messages from the air.
Radio Interference
48-bit address that is unique for each Bluetooth device and defined by IEEE . Private authentication key.
128-bit random number used for authentication purposes
Private encryption key.
Security mechanisms are more complex than 802.11 due to the “ad-hocness”.












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