What is Bluetooth?
History of Bluetooth
How it works?
Bluetooth is a wireless technology used to transfer
data between different electronic
devices. The distance of data
transmission is small in
comparison to other modes
of wireless communication.
This technology eradicates the
use of cords, cables, adapters
and permits the electronic devices
to communicate wirelessly among
The purpose of Bluetooth technology
is to connect numerous electronic devices together
without the need of wires.
-> The name Bluetooth was inspired by “Herald Bluetooth” was
king of Denmark who ruled in 10th century.
->Bluetooth was invented in 1994 by Jaap Haartsen and Sven
Mattisson, who were working for Ericsson Mobile Platforms in
->Bluetooth is not owned by any company and is developed
and maintained by SIG(Special Interest Group). The SIG was
formally announced on May 20, 1998.
->The SIG comprises more than 1000 companies. The major
companies who created the technology include
Intel, Samsung, Ericsson, IBM, Motorola, Nokia, Toshiba
1998 - Bluetooth technology is officially introduced
1999 - Bluetooth 1.0 Specification is introduced.
2003 - Bluetooth Core Specification with the
announcement of Version 2.1.
2004 - Bluetooth Version 2.0 + EDR (Enhanced Data
Rate) is introduced.
2005 - Version 2.0 + EDR in late 2005.
2007 - Bluetooth Core Specification Version 2.1 + EDR
2009 - Bluetooth Core Specification Version 3.0 + HS
(High Speed) is adopted.
Piconet = set of eight devices can communicate in a ad – hoc
fashion called a piconet.
Scatternet = set of piconet
Master-Slaves can switch roles(A master can simultaneously
connect up to seven slaves.)
A node can only be master of one piconet.
Wireless Networks Spring 2005
It comprises of a base band processor, a radio and an antenna . The
base-band processor converts the data into signals, the antenna of
another blue tooth device, within at least 30 feet distance, receives a
transmitted signal in the air.
Each frame consists of a transmit
packet and a receive packet.
Each packet may have either 1, 3 or 5
Single slot packet – max data rate of
Multi slot frames support higher
rates– 721Kbps or a max. of 3 voice
A device can’t be masters for two
The slave of one piconet can be the
master of another piconet
Wireless (No Cables)
No Setup Needed
Cheap and Portable
Industry Wide Support
Connection is fast and easy
Short range 10 meters or 15-30 feet depending
upon the device
Small throughput rates
- Data Rate 1.0 Mbps
First time setup can be complicated
Slow data transfer rate as compared to Wi-Fi
Security is Biggest Disadvantage as transfer takes
place through radio waves and a hacker can easily
And many more…
Bluetooth, the big improvements added to 3.0 and
4.0 were significant. While the general range of the
wireless protocol remains the same (up to 30 feet),
version 3.0 enabled a much faster theoretical data
throughput of 26Mbps compared with the 2Mbps
of version 2.1.
The real benefit of Bluetooth 4.0 is energy
Often, with new technology, early changes mean
reconstruction. Not With Bluetooth, instead, there
will be an improvement to the existing standard.
Bluetooth wireless technology is
optimized for different purposes in different domains
WLAN & WPAN, respectively. The same design points
that make them well-suited for their primary intended
purposes make them less well-suited for other
Bluetooth wireless technology is not a
robust networking technology; IEEE 802.11 is not the
preferred technology for WPAN applications. The IEEE
802 working groups and the Bluetooth SIG have a
cooperative relationship, and are working together on
the issues of coexistence in the spectrum that they