•Bluetooth is a short-range wireless communications
technology originally intended to replace the cables
connecting portable and/or fixed devices while maintaining high levels of security.
•It operates at a frequency of 2.4GhZ with bandwidth of few Mbit/s.
• Each interface can have 7simultaneous connections.
•This technology can be replace cable and provide portability.
•This technology provide high level security. Because Bluetooth use Built-in encryption and verification.
•Operating range of 10 meters, with optional 100 meter mode.
•Transmission power of 1 mW
•Operates in free ISM band [2.4000 – 2.4835 GHz]
HISTORY OF BLUETOOTH
•Bluetooth technology, first developed in 1994.
• Got its name from a 10th century Danish king named Harald Bluetooth
•Bluetooth SIG (Special Interest Group)
-Founded in 1998 by : Ericsson, Intel,
IBM, Toshiba and Nokia - Position Bluetooth in the market place
Current specification : Bluetooth 2.1
•Voice and Data access points
•Up to 8 devices can be networked at a time
•Play Multiplayer Games Over Bluetooth. ..
•Connect Different Devices.
•Control Home Security Gadgets.
•Bluetooth and Cars.
•Transfer Files Between Two Devices.
Application of Bluetooth
Why we use Bluetooth?
•Expansive growth in the last few years.
•Easy to establish connection .
•Recent driving laws will cause an increased need for
Bluetooth Model is Used
-Voice/data access points
-Personal Area Networking (PAN)
VOICE/DATA ACCESS POINTS
Voice/data access points is one of the key initial usage models and involves connecting a computing device to a communicating device via a secure wireless link.
The second category of uses, peripheral interconnects, involves connecting other devices together.
PERSONAL AREA NETWORKING
The last usage model, Personal Area Networking (PAN), focuses on the adhoc formation and breakdown of personal networks
Bluetooth Protocol Stack
•Bluetooth Radio : specifics details of the air interface, including frequency, frequency hopping, modulation scheme, and transmission power.
•Baseband: concerned with connection establishment within a piconet, addressing, packet format, timing and power control.
•Link manager protocol (LMP): establishes the link setup between Bluetooth devices and manages ongoing links, including security aspects (e.g. authentication and encryption), and control and negotiation of baseband packet size.
Connection Establishment States
-Standby :-State in which Bluetooth device is inactive, radio not switched on, enable low power operation.
-Page :- Master enters page state and starts transmitting paging messages to Slave using earlier gained access code and timing information.
Device periodically enters page state to allow paging devices to establish connections.
State in which device tries to discover all Bluetooth enabled devices in the close vicinity.
Most devices periodically enter the inquiry scan state to make themselves available to inquiring devices.