Bluetooth Technology

BLUETOOTH TECHNOLOGY Submitted By

NIPUL GARG

What is Bluetooth?  Wireless, short-range communication  Replacement for USB cables. Low power, low cost. 

Automatically hook together mobile devices.

History of Bluetooth 

Named after Harald Blaatand “Bluetooth”, a viking king of Denmark 940-981 A.D.



Invented in 1994 by L. M. Ericsson, Sweden.

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Bluetooth technology is founded by Ericsson, IBM, Intel, Nokia and Toshiba in Feb 1998.

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Bluetooth two version have been released, version 1.0 and 1.1.

Features of Bluetooth 

Communicate at 2.4 GHz frequency.

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10-100 meter range. – Class I – 100 meter (300 feet) – Class II – 20 meter (60 feet) – Class III – 10 meter (30 feet)

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1 Mbps data transfer rate.

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Simultaneous voice and data can be transfer.

Bluetooth Frequency 

2.45 GHz frequency is allocated by IRFA .

Communicates at 2.45 GHz frequency

Infra Red v/s Bluetooth 

Present wireless technology like infra red data communication has two problems – 1) Line of Sight 2) One to One



BLUETOOTH OVERCOMES THESE PROBLEMS

Basic Working Idea Bluetooth is a standard for tiny, radio frequency chips that can be plugged into your devices These chips were designed to take all of the information that your wires normally send, and transmit it at a special frequency to a receiver Bluetooth chip The information is then transmitted to your device

Spread-Spectrum Frequency Hopping  Bluetooth

uses a packet switching protocol based on a technology called spread-spectrum frequency hopping

A

device will use 79 individual randomly chosen frequencies within a designated range, changing from one to another on a regular basis.

 Range

is from 2.402GHz to 2.480GHz, in steps of

1MHz.  The

frequency hopping is done at a rate of 1600 Hz.

BLUETOOTH PROTOCOL STACK Application / Profiles OTHER A U D I O

RF COMM.

TELE PHONY

LLC

LLC ADAPTATION PROTOCOL LINK MANAGER

BASEBAND PHYSICAL RADIO

APPLICATION LAYER

SERVICE

C O N T R O L

MIDDLEWARE LAYER

DATA LINK LAYER

PHYSICAL LAYER

BLUETOOTH FRAME STRUCTURE BITS

72

54

0 - 2744

ACCESS HEADER CODE

BITS

5 ADDR

DATA

4 TYPE

1 1 1 F

A

S

8 CHECKSUM

18 bit header is represented 3 times from a total 54 bits

Connection EstablishmentTime Inquiry

Paging

Typical

5.12 s

0.64 s

Max

15.36 s

7.38 s

Connected

Bluetooth Devices Bluetooth will be enabled in everything from: 

Telephones



Headsets



Computers



Cameras



PDAs



Cars

Usage Models Voice/Data Access Points 





Connecting a computing device to a communicating device. Allows any device with a bluetooth chip to connect to the internet. Example- a notebook could link to the internet using a mobile phone as an access point.

Usage models Peripheral Interconnects 



Standard peripheral devices like keyboard, headsets etc working over a wireless link. The same device can be used in multiple functions e.g a headset can access phones while in the office and can interface with a cellular phone when mobile.

Usage model Personal Area Networking 

Allows dynamic formation and breakdown of “PICONETS”--ad-hoc personal networks.

Future Usage  Telecommunication  Home

Automation

 Home

Entertainment/Games

 Networking  Industrial

Control

 Computing  Medical  Current

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